DOCSLIB.ORG

United States Patent Office Patented Sept

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
United States Patent Office Patented Sept 3,838,140 United States Patent Office Patented Sept. 24, 1974 1. 2 is salts, in particular sodium or potassium salts of the fol 3,838,140 lowing types of compounds: long chain fatty acids, colo MOLECULARWEIGHT REGULATON EN phony or colophonyl derivatives, e.g. colophony obtained CELOROPRENE POLYMERS Rudolf Mayer-Mader, Cologne, and Jurgen Boldt, from wood, tall oil colophony, disproportionated colo Opladen, Germany, assignors to Bayer Aktiengesell phony or partly polymerised colophony, higher alcohol schaft, Leverkusen, Germany sulphates and aryl sulphnic acids, e.g. alkylbenzene sul No Drawing. Filed Nov. 9, 1972, Ser. No. 305,134 phonic acids, and the condensation product of formalde Claims priority, application Germany, Nov. 13, 1971, hyde with a naphthalene sulphonic acid. P 21 S6 452.3 The concentration of the organic monomer in the emul Int, C. C08d 3/14: CO8f 1/80, 3/32 O sion used as starting material is not of decisive importance. U.S. C. 260- 92.3 4 Claims It is generally 30 to 60%, based on the total weight of the emulsion when preparing the polymer. ABSTRACT OF THE DISCLOSURE The pH is preferably in the alkaline region. Polymerisa tion may be carried out at temperatures of between 0° C. A process for polymerising a monomer composition of 5 and 80° C. and is preferably carried out between 30° C. chloroprene and 0 to 50% by weight of one or more other and 50° C. copolymerisable monomers in aqueous emulsion on radi Polymerisation is stopped when monomer conversion cal forming catalysts in the presence of a selected dialkoxy has reached a stage at which a polymer which is soluble xanthate disulphide and a mixture of the polymer thus in benzene is obtained. The appropriate point at which obtained with a benzene insoluble cross-linked chloroprene 20 polymerisation is stopped depends to a certain extent on polymer. the amount of dialkoxyxanthogendisulphide used but is generally at a monomer conversion of about 50 to 70%. It is known to polymerise chloroprene in the presence The usual "stopping agents' such as those indicated in of dialkylxanthogendisulphides as molecular weight regu U.S. Patent 2,576,009 are used for stopping polymerisa lators (see British Patent No. 512,458). It is also known 25 tion. Unreacted monomer is removed in known manner, to use mercaptans for regulating the molecular weight (see e.g. by steam distillation as described in U.S. Patent No. U.S. Patent No. 2,567,117). 2,467,769. If polymerisation is stopped when not more than 70% Up to 50% of the chloroprene may be replaced by some of the monomers have reacted, the polychloroprenes ob other copolymerisable monomer. Suitable comonomers tained by these methods are soluble in benzene, i.e. they 30 for this purpose are, for example, vinyl aromatic com are not crosslinked. Polychloroprene polymers which are pounds Such as styrene, vinyl toluenes and vinyl naphtha particularly easy to process are obtained by mixing such lenes, aliphatic conjugated diolefine compounds such as benzene soluble polychloroprenes which are not cross 1,3-butadiene, isoprene, 2,3-dimethyl-1,3-butadiene and linked with cross-linked benzene insoluble chloroprene 2,3-dichloro-1,3-butadiene, vinyl ethers, esters and ketones polymers (see British Patent No. 1,158,970 and German 35 Such as methylvinylether, vinyl acetate and methylvinyl Offenlegungsschrift No. 2,008,673). ketone, and esters, amides, and nitriles of acrylic acid and These mixtures, however, have insufficient thermal sta methacrylic acid such as ethyl acrylate, methyl methacry bility if dialkylxanthate disulphides are used as molecular late, methacrylamide and acrylonitrile. weight regulators (their Mooney viscosity increases on This invention also relates to a mixture of a benzene exposure to heat) and insufficient mechanical strength 40 Soluble uncross-linked chloroprene polymer (a) and a when mercaptains are used as molecular weight regulators. benzene-insoluble cross-linked chloroprene polymer (b), This invention relates to a process for polymerising a wherein the benzene-soluble chloroprene polymer is a monomer composition comprising chloroprene and 0 to polymer of chloroprene and if desired of up to 50% by 50% by weight based on total monomer composition of 45 Weight (based on the monomer mixture) of another co one or more copolymerisable monomers in an aqueous polymerisable monomer which has been obtained in the emulsion on radical forming initiators, in the presence of presence of 0.1 to 20 parts by weight per 100 parts by 0.1 to 20 parts by weight per 100 parts by weight of Weight of monomer of a dialkoxyxanthate disulphide of monomer composition of a dialkoxyXanthogendisulphide the formula of the formula 50 V/, s s V/, (CIA-o-c-s-s-C-O-(CH.) not to -- to-tely 55 in which R and R' represent methyl or ethyl. The benzene soluble chloroprene polymer in this mix ture is therefore the product whose preparation has been described above. in which R and R' represent methyl or ethyl. Benzene insoluble cross-linked chloroprene polymers The basic polymerisation process of chloroprene is 60 suitable for the mixture with the soluble chloroprene poly known in the art, see e.g. U.S. Patents Nos. 3,042,652; mer described above may be prepared by various proc 3,147,317 and 3,147,318. esses which yield a cross-linked polymer in latex form. For In the process of this invention, the dialkoxyxanthogen example, chloroprene may be polymerised to a high con disulphides of Formula I are generally used in quantities version (i.e. about 90 to 100%) in the absence of a chain of 0.1 to 20 parts by weight per 100 parts of monomers, 65 transfer agent or with only small quantities of such a sub preferably 0.15 to 1 part by weight. Dialkoxyxanthogen stance, e.g. an alkyl mercaptain or dialkoxyxanthogendi disulphides of Formula I are known. sulphide. A suitable process resulting in high conversion Polymerisation is carried out in aqueous emulsion using has been described in U.S. Patent No. 3,147,317. Another a polymerisation catalyst which forms free radicals, e.g. method of forming a cross-linked chloroprene polymer an alkali metal persulphate (such as potassium persul 70 consists in including in the polymerisation system a mono phate). Any of the usual emulsifiers may be used for pre mer which is copolymerised with chloroprene and which paring the monomer emulsion. These include water-soluble contains two or more polymerisable double bonds. Suit 3,838,140 3 4. able comonomers for this purpose are, for example, divin EXAMPLES ylbenzene and esters of acrylic acids and polyhydroxy compounds such as alkylene glycols, dihydroxybenzene or 1. Preparation of benzene soluble polychloroprenes with trimethylolpropane. di-(3-oxapentyl-1) Xanthogendisulphide These polymerisations are effected by the same meth 5 A monomer mixture of ods which yield benzene soluble chloroprene polymers 100 parts by weight of chloroprene and but monomer conversion can be higher, e.g. up to 90 to 100%. X parts by weight of di-(3-oxa-pentyl-1)-xanthogendisul Another method of producing cross-linked chloroprene phide polymers which are suitable for the purposes of this in 10 and a mixture of vention consists in subjecting the latex of an uncross 120 parts by weight of demineralised water, linked chloroprene polymer to an after-treatment by 5 parts by weight of the sodium salt of a dispropor which the polymer in the latex is cross-linked. Examples - tionated abietic acid, of suitable methods are irradiation with actinic light as 0.5 parts by weight of the sodium salt of a condensation in U.S. Patent No. 3,042,652 and treatment with an or 5 product of naphthalene sulphonic acid and formalde ganic peroxy compound as in U.S. Patent No. 3,147,318. hyde, In the preparation of the cross-linked chloroprene 0.5 parts by Weight of sodium hydroxide and polymer, up to about 20% of the chloroprene may be 0.5 parts by Weight of tetrasodium pyrophosphate were replaced by another monomer. Examples of such mono prepared Separately. mers have been mentioned above in the description of 20 the preparation of the benzene soluble chloroprene The monomer mixture is emulsified in the aqueous polymer. phase, the emulsion is heated to 43° C. and polymerisa The benzene insoluble chloroprene polymer preferably tion is initiated by dropwise addition of an activator solu used is a copolymer of chloroprene and 2 to 20% by tion of 2.5 parts by weight of formamidine sulphinic weight, based on the quantity of chloroprene, of a di 25 acid and 97.5 parts by weight of water. ester of dihydric aliphatic alcohol and an acrylic acid. Polymerisation is stopped when 65-70% of the mono These diesters correspond to the formula, mers have been converted, the remaining monomers are removed by Steam distillation and a sample of the poly mer is isolated from the resulting latex by electrolyte 30 precipitation followed by drying. The experiment was carried out with various quantities R1 O O R2 of di- (3-oxapentyl-1)-xanthogendisulphide. The results are shown in Table I. in which R1 and R2 represent hydrogen, alkyl radicals containing 1-4 carbon atoms or chlorine and X repre TABLE I sents an alkylene radical with 2-20 carbon atoms. Exam Mooney Farts by viscosity ples of such compounds are: ethylene dimethacrylate, weight of ML-4 propylene dimethacrylate, butylene dimethacrylate, iso Xanthiate (100° C.) of butylene dimethacrylate, ethylene diacrylate, propylene 40 disulphide the polymer Experiment: diacrylate, butylene diacrylate and isobutylene diacrylate. >200 The polymerisation process for the preparation of these 140 products is similar to the usual method of polymerisation 59 42 of chloroprene in aqueous emulsions.
Load more

Recommended publications
  • Comparative Durability and Abrasion Resistance of Natural and Synthetic
    Comparative Durability and Abrasion Resistance of Natural and Synthetic Latex Gloves Ryan Michel2 and Katrina Cornish1,2 Department of Horticulture and Crop Science, 2Department of Food, Agricultural and Biological Engineering, Ohio Agricultural Research and Development Center, The Ohio State University, Wooster, OH 44691 Abstract Medical gloves assist with the prevention of the spread of germs and are required to be worn when working with blood, body tissues, mucous membrane, and broken skin. They should provide good protection between hands and bio hazardous fluids to prevent contamination and promote safety of all healthcare workers and patients. Hence, it is critical for medical gloves to meet a standard performance criterion. Under ASTM D 3577 and D 3578, medical gloves have requirements they must meet in order to be sold and distributed as new gloves. However, there are no industry standards for gloves to meet while in use. The goal of this project was to develop a standard test for glove durability after their initial use. For the tests, gloves were worn by a mechanized prosthetic hand that was put under different conditions which are normally experienced by professionals in the medical field. This design was developed and later confirmed by Dr. Katrina Cornish: Design: Effects of media outside the glove Phosphate buffered saline (PBS), 70% ethanol, air Gloves Tested: Chloroprene, Latex 2, Nitrile, Polyvinyl Chloride and Latex 1 To evaluate glove durability during use, the gloves were immersed in different media before being subjected to contact with an abrasive surface. From this design, ranking of commercially available gloves are developed based on the time until failure of the gloves in these tests.
    [Show full text]
  • Chemical Resistance List
    Chemical Resistance List Resistance Substance Permeation Time/Level to Degradation Fluoro- natural chloro- nitrile/ nitrile carbon butyl latex prene chloroprene rubber NR CR CR NBR FKM IIR NR NR CR CR NBR NBR NBR NBR NBR FKM IIR IIR NBR NBR 395 450, 451 720, 722 717 727 730, 732 740, 741 743 754 764 890 897 898 chemical physical 403 706 723, 725 733, 836 742, 757 state 708 726 736 - 739 759 - 0 - 0 0 + 1-methoxy-2-propanol paste 4 2 2 3 4 4 B 1 3 4 6 6 - 0 - 0 0 + 1-methoxy-2-propyl acetate liquid 3 1 1 3 3 A B 2 3 6 6 - 0 0 - 0 + 1-methyl-2-pyrrolidone liquid 5 2 3 3 3 2 A B 1 3 3 6 6 - 0 + + + - 1,1,2-trichlorotrifluoroethane liquid 1 0 5 4 6 6 1 1 2 1 6 1 2 - - - - - - 1.2-epoxy ethane (ethylene oxide) liquid B A A A A 0 0 0 B 1 2 - - - - - - 1.2-epoxy propane (propylene oxide) liquid B A A A 1 A 0 0 0 B 1 2 + + + + + + 1.2-propanediol liquid 6 6 6 6 6 6 6 6 6 6 6 6 6 - + - + + 0 2-ethyl hexyl acrylate liquid 2 1 1 5 6 1 1 2 6 2 3 - 0 0 0 + + 2-mercaptoethanol liquid 3 2 4 4 4 4 1 1 3 6 6 6 - - - 0 0 - 2-methoxy-2-methyl propane liquid 1 B B 2 4 A 1 4 1 3 2 2 - - - - - 0 3-hexanone liquid 1 B 1 1 1 0 0 0 0 0 3 3 - - - - - 0 4-heptanone liquid 1 A 1 1 1 A 0 0 0 B 3 3 - - - - - + acetaldehyde liquid 1 1 1 1 B 0 0 0 A 0 6 6 0 0 0 - - + acetic acid anhydride liquid 6 3 3 3 3 2 A B 1 B 2 6 6 + + + + + + acetic acid, 10 % liquid 6 6 6 6 6 6 6 6 6 6 6 6 6 0 + + + + + acetic acid, 50 % liquid 5 4 6 6 6 2 4 6 6 6 6 - - - - 0 + acetic acid, conc.
    [Show full text]
  • Download Author Version (PDF)
    RSC Advances This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication. Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. This Accepted Manuscript will be replaced by the edited, formatted and paginated article as soon as this is available. You can find more information about Accepted Manuscripts in the Information for Authors. Please note that technical editing may introduce minor changes to the text and/or graphics, which may alter content. The journal’s standard Terms & Conditions and the Ethical guidelines still apply. In no event shall the Royal Society of Chemistry be held responsible for any errors or omissions in this Accepted Manuscript or any consequences arising from the use of any information it contains. www.rsc.org/advances Page 1 of 10Journal Name RSC Advances Dynamic Article Links ► Cite this: DOI: 10.1039/c0xx00000x www.rsc.org/xxxxxx ARTICLE TYPE Reverse Iodine Transfer Polymerization (RITP) of Chloroprene Jia Hui, Yan Shi,* Tao Li, Jie Wu and Zhifeng Fu Received (in XXX, XXX) Xth XXXXXXXXX 20XX, Accepted Xth XXXXXXXXX 20XX DOI: 10.1039/b000000x 5 State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing 100029, China E-mail: [email protected] Fax: +86-010-64423811; Tel: +86-010-64416783 10 Reversible-deactivation radical polymerization (RDRP) of chloroprene (2-chloro-1,3-butadiene, CP) using reverse iodine transfer polymerization (RITP) has been demonstrated for the first time.
    [Show full text]
  • Vinyl Chloride Production
    Vinyl Chloride Production Capstone Design Project Spring 2003 Chemical Engineering -University of Oklahoma Jeremy Dry Bryce Lawson Phuong Le Israel Osisanya Deepa Patel Anecia Shelton Vinyl Chloride Production Plant Table of Contents Section 1: Introduction............................................................................................5 Section 2: Available Processes ................................................................................5 2.1 Vinyl Chloride from Acetylene ...............................................................5 2.2 Vinyl Chloride from Ethane.....................................................................6 2.3 Vinyl Chloride from Ethylene .................................................................6 Section 3: Process Design ........................................................................................7 3.1 Thermodynamics......................................................................................7 3.2 Balanced Process Overview ....................................................................7 3.3 Balance Process Outline ..........................................................................7 3.4 Direct Chlorination Reactor Design.........................................................8 3.5 Direct Chlorination Process Simulation...................................................9 3.6 Direct Chlorination Control and Instrumentation....................................10 3.7 Oxychlorination Reactor Design..............................................................10
    [Show full text]
  • 3,4-Dichlorobut-1-Ene Cas N°: 760-23-6
    OECD SIDS 3,4-DICHLOROBUT-1-ENE FOREWORD INTRODUCTION 3,4-DICHLOROBUT-1-ENE CAS N°: 760-23-6 UNEP PUBLICATIONS OECD SIDS 3,4-DICHLOROBUT-1-ENE SIDS INITIAL ASSESSMENT PROFILE CAS No. 760-23-6 Chemical Name 3,4-Dichlorobut-1-ene Structural Formula CH2=CH-CHCl-CH2Cl RECOMMENDATIONS The chemical is a candidate for further work. SUMMARY CONCLUSIONS OF THE SIAR Human Health Oral LD50 and inhalation LC50 of 3,4-dichlorobut-1-ene (3,4-DCB) are about 940 mg/kg and 2100 ppm, respectively. Inhalation repeated dose study in rats conducted for 14 days, 6 hours/day, 5 days/week at doses of 104 mg/m3 (20 ppm) and 1037 mg/m3 (200 ppm) of 3,4-DCB. Relative liver weight increased and change in liver cell morphology was observed at 1037 mg/m3 dose. This chemical is slightly irritating to skin and eyes. Acute skin irritation in rabbits according to OECD TG 404 causes erythema but does not cause systemic intolerance reaction. Acute eye irritation study by instillation into the conjunctival sac of rabbits according to OECD TG 405 causes corneal opacity and conjunctival redness but does not cause systemic intolerance reaction. In an oral study in rats by OECD combined repeated dose and reproductive/developmental toxicity screening test [OECD TG 422] at doses of 0, 0.4, 2, 10 and 50 mg/kg/day for at least 44 days, organ weight and histopathological changes were induced. In males, absolute kidney weights were slightly increased with 10 mg/kg and absolute and relative weights of the liver and kidneys were increased with 50 mg/kg.
    [Show full text]
  • Organic Toxic Substances Monitoring in Virginia
    W&M ScholarWorks Dissertations, Theses, and Masters Projects Theses, Dissertations, & Master Projects 1983 Organic toxic substances monitoring in Virginia Robert Emile. Croonenberghs College of William and Mary - Virginia Institute of Marine Science Follow this and additional works at: https://scholarworks.wm.edu/etd Part of the Environmental Sciences Commons Recommended Citation Croonenberghs, Robert Emile., "Organic toxic substances monitoring in Virginia" (1983). Dissertations, Theses, and Masters Projects. Paper 1539616622. https://dx.doi.org/doi:10.25773/v5-vdbf-8m78 This Dissertation is brought to you for free and open access by the Theses, Dissertations, & Master Projects at W&M ScholarWorks. It has been accepted for inclusion in Dissertations, Theses, and Masters Projects by an authorized administrator of W&M ScholarWorks. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or “target” for pages apparently lacking from the document photographed is “Missing Page(s)”. If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity. 2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed.
    [Show full text]
  • Vinyl Chloride Production Senior Design Presentation
    Vinyl Chloride Production Senior Design Presentation Group 10 Jeremy Dry Israel Osisanya Bryce Lawson Deepa Patel Phuong Le Anecia Shelton Project Purpose To design an environmentally safe vinyl chloride production plant. Questions: What is Vinyl Chloride? How its being produced? How much does it cost to be environmentally friendly? Vinyl Chloride 99% of VCM is used to manufacture polyvinyl chloride (PVC). PVC consumption is second to low density polyethylene. VCM production results in a number of unwanted by-products. VCM Plant Emissions in the United States 0.0008 0.0007 0.0006 0.0005 0.0004 0.0003 lb/lb VCM product 0.0002 0.0001 0 123456789 1 Formosa-LA 4 Georgia Gulf-LA 7 Borden-LA 2 Oxyvinyls-D-TX 5 Westlake Monomers-KY 8 Dow-LA 3 Oxyvinyls-L-TX 6 Formosa-TX 9 Dow-TX Manufacturing Methods Vinyl Chloride from Acetylene Vinyl Chloride from Ethane Vinyl Chloride from Ethylene (Direct Route) Vinyl Chloride from Ethylene (EDC) Balanced Process for Vinyl Chloride Production Direct chlorination CH2CH2 + Cl2 → ClCH2CH2Cl (EDC) Oxychlorination CH2CH2 + 2 HCl + ½ O2 → EDC+ H2O EDC pyrolysis 2 EDC → 2 CH2CHCl (VCM) + 2 HCl Overall reaction 2 CH2CH2 + Cl2 + ½ O2 → 2 CH2CHCl + H2O •No generation of HCl •95% of the world’s VCM is produced utilizing the balanced process Balanced Process for Vinyl Chloride Production HCl recycle Air or O2 Light ends Oxy- chlorination VCM Ethylene EDC EDC purification purification pyrolysis VCM EDC recycle Direct Cl chlorination 2 Heavy ends Direct Chlorination and Oxychlorination P&ID CAUSTIC SCRUBBERS OXYDC REACTOR
    [Show full text]
  • ELMER KEISER BOLTON June 23, 1886-Jidy 30, 1968
    NATIONAL ACADEMY OF SCIENCES E LMER KEISER BOLTON 1886—1968 A Biographical Memoir by RO BE R T M. J O Y C E Any opinions expressed in this memoir are those of the author(s) and do not necessarily reflect the views of the National Academy of Sciences. Biographical Memoir COPYRIGHT 1983 NATIONAL ACADEMY OF SCIENCES WASHINGTON D.C. ELMER KEISER BOLTON June 23, 1886-Jidy 30, 1968 BY ROBERT M. JOYCE LMER KEISER BOLTON was one of the outstanding leaders E of industrial research. He became an industrial re- search director at a time when research was only beginning to be a significant factor in the chemical industry. There were no models for this new role, and Bolton's concepts of direct- ing industrial research were in large measure those that he formulated himself, reflecting his vision and drive to achieve important commercial goals. The record of industrial products developed by Du Pont research organizations that he directed is impressive; it in- cludes synthetic dyes and intermediates, flotation chemicals, rubber chemicals, neoprene synthetic rubber, nylon synthetic fiber, and Teflon® polytetrafluoroethylene resin. His leader- ship in bringing these developments to fruition was always apparent to management and to those he directed, but be- cause of his characteristic self-effacement his name is not widely associated with these accomplishments. Throughout his career he supported and encouraged his technical person- nel. Most important, he had the knack of picking the right time and direction to take in moving a research lead into development. Many of his decisions proved crucial to the ultimate success of these ventures.
    [Show full text]
  • What Is Showa Denko Chloroprene?
    Polychloroprene Rubber 2 What is Showa Denko Chloroprene? Well balanced elastomer CR Elasticity Oxidation resistance Heat resistance Oil resistance Showa Denko Chloroprene CR CR CR CR (CR) is a type of synthetic NR NR NR NR rubber used as an elastomer SBR SBR SBR SBR NBR NBR NBR NBR in the automotive (belts and EPDM EPDM EPDM EPDM hoses), construction (waterproofing and sealing), Poor Excellent Poor Excellent Poor Excellent Poor Excellent wire and cable, adhesives, and countless other industries. Showa Denko Chloroprene has been Low temperature resistance Compression set Gas transmission resistance Weather resistance produced for over 50 years and continues to expand CR CR CR CR NR NR NR NR its application fields. The properties of Showa SBR SBR SBR SBR Denko Chloroprene is highlighted by the a wide range NBR NBR NBR NBR EPDM EPDM EPDM EPDM of resistances to sun, ozone, and weathering, many Poor Excellent Poor Excellent Poor Excellent Poor Excellent oils and chemicals, low and high temperatures, flame, and toughness against abrasion and general Ozone resistance Abrasion resistance Insulation resistance Flame resistance wear. The versatile properties have long been the CR CR CR CR key to Showa Denko Chloroprene’ s utility as a NR NR NR NR SBR SBR SBR SBR multi-purpose rubber. The product is available in NBR NBR NBR NBR over 40 grades, produced as either a dry chip or EPDM EPDM EPDM EPDM aqueous dispersion (Latex). Poor Excellent Poor Excellent Poor Excellent Poor Excellent *These figures are only for reference purposes and therefore do not
    [Show full text]
  • Toxicological Review (PDF)
    EPA/635/R-09/010F www.epa.gov/iris TOXICOLOGICAL REVIEW OF CHLOROPRENE (CAS No. 126-99-8) In Support of Summary Information on the Integrated Risk Information System (IRIS) September 2010 U.S. Environmental Protection Agency Washington, DC DISCLAIMER This document has been reviewed in accordance with U.S. Environmental Protection Agency policy and approved for publication. Mention of trade names or commercial products does not constitute endorsement or recommendation for use. ii TABLE OF CONTENTS LIST OF TABLES.................................................................................................................................... v LIST OF FIGURES ................................................................................................................................. ix LIST OF ABBREVIATIONS AND ACRONYMS ................................................................................ xi FOREWORD.........................................................................................................................................xiii AUTHORS, CONTRIBUTORS, AND REVIEWERS ......................................................................... xiv 1. INTRODUCTION ................................................................................................................................ 1 2. CHEMICAL AND PHYSICAL INFORMATION .............................................................................. 3 3. TOXICOKINETICS............................................................................................................................
    [Show full text]
  • Announcement of Acquisition of Chloroprene Rubber Business from Dupont, U.S
    December 11, 2014 To Whom It May Concern DENKI KAGAKU KOGYO KABUSHIKI KAISHA MITSUI & CO., LTD. Announcement of Acquisition of Chloroprene Rubber Business from DuPont, U.S. DENKI KAGAKU KOGYO KABUSHIKI KAISHA (Headquarter: Chuo-ku, Tokyo; Shinsuke Yoshitaka, President & CEO, hereinafter “DENKA”) and MITSUI & CO., LTD. (Headquarter: Chiyoda-ku, Tokyo; Masami Iijima, President & CEO, hereinafter “Mitsui”) are pleased to announce that DENKA and Mitsui decided to establish Denka Performance Elastomer, a joint venture company with the capital ratio of 70% by DENKA and 30% by Mitsui (“DPE”), in the U.S., and to enter into an agreement with DuPont, an international diversified chemicals manufacturer, for an acquisition (the “Acquisition”) of DuPont’s business relating to the manufacture and sale of chloroprene rubber (“CR”) business (the “Subject Business”) and that DENKA and Mitsui entered into such agreement with DuPont on December 9, 2014. We aim to complete the Acquisition during the 1st half of 2015, subject to official approvals of competent authorities. * What is CR CR is a synthetic rubber which is easy to process and has a strong balance of excellent properties such as weather resistance, ozone resistance, oil resistance, abrasion resistance, flame retardance, heat resistance, etc. CR is used for a wide range of application such as transmission belts and automotive parts, foam rubber, adhesives, etc. There are two methods to manufacture CR, acetylene method and butadiene method, of which main raw materials differ. 1. Purpose of Acquisition In 1962, DENKA commenced the manufacture and sale of CR at the Omi plant (Itoigawa-city, Niigata) by using its own technology (acetylene method), and currently is one of the largest CR manufacturer supplying in approximately 80 countries worldwide.
    [Show full text]
  • Universiv Micrdrilms International 300 N
    INFORMATION TO USERS This reproduction was made from a copy of a document sent to us for microfilming. While the most advanced technology has been used to photograph and reproduce this document, the quality of the reproduction is heavily dependent upon the quality of the material submitted. The following explanation of techniques is provided to help clarify markings or notations which may appear on this reproduction. 1.The sign or “target” for pages apparently lacking from the document photographed is “Missing Page(s)”. If it was possible to obtain the missing page(s) or section, they are spliced into the film along with adjacent pages. This may have necessitated cutting through an image and duplicating adjacent pages to assure complete continuity. 2. When an image on the film is obliterated with a round black mark, it is an indication of either blurred copy because of movement during exposure, duplicate copy, or copyrighted materials that should not have been filmed. For blurred pages, a good image of the page can be found in the adjacent frame. If copyrighted materials were deleted, a target note will appear listing the pages in the adjacent frame. 3. When a map, drawing or chart, etc., is part of the material being photographed, a definite method of “sectioning” the material has been followed. It is customary to begin filming at the upper left hand comer of a large sheet and to continue from left to right in equal sections with small overlaps. If necessary, sectioning is continued again-beginning below the first row and continuing on until complete.
    [Show full text]