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(12) United States Patent (10) Patent No.: US 8.614,268 B2 Lundquist Et Al

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(12) United States Patent (10) Patent No.: US 8.614,268 B2 Lundquist Et Al USOO861.4268B2 (12) United States Patent (10) Patent No.: US 8.614,268 B2 Lundquist et al. (45) Date of Patent: Dec. 24, 2013 (54) STABILIZED POLYMER COMPOSITIONS (58) Field of Classification Search USPC ......... 524/180,397, 181, 178, 182,351,352, (75) Inventors: Eric G. Lundquist, North Wales, PA 524/357: 525/366; 252/182.14,400.1 (US); Jian-Yang Cho, Blue Bell, PA See application file for complete search history. (US) (73) Assignee: Rohm and Haas Company, (56) References Cited Philadelphia, PA (US) U.S. PATENT DOCUMENTS (*) Notice: Subject to any disclaimer, the term of this 4,681907 A 7, 1987 Mesch et al. patent is extended or adjusted under 35 5,100,946 A * 3/1992 Hung et al. ................... 524/397 U.S.C. 154(b) by 113 days. FOREIGN PATENT DOCUMENTS (21) Appl. No.: 12/661,958 EP O107063 5, 1984 (22) Filed: Mar. 26, 2010 EP O 492 803 B1 6, 1996 (65) Prior Publication Data * cited by examiner US 2010/O267872A1 Oct. 21, 2010 Primary Examiner — James J Seidleck Related U.S. Application Data Assistant Examiner — Deve E Valdez (74) Attorney, Agent, or Firm — Tifani M. Edwards (60) Provisional application No. 61/212,735, filed on Apr. 15, 2009. (57) ABSTRACT (51) Int. C. This invention relates to the thermal stabilization of halogen CSK 5/02 (2006.01) containing polymer compositions, more particularly, this CSK 5/58 (2006.01) invention relates to a poly(vinyl chloride) (PVC) or a chlori COSK 5/57 (2006.01) nated polyvinyl chloride (cPVC) composition comprising an CSK 3/00 (2006.01) alkyltin stabilizer and at least one salt of a polymeric polyacid (52) U.S. C. Such as a polycarboxylic acid salt Supported on a polymeric USPC ........... 524/181: 524/180,524/1.78: 524/182: material. 524/351; 524/352:524/357: 525/366; 252/182.14; 252/400.1 4 Claims, No Drawings US 8,614,268 B2 1. 2 STABILIZED POLYMER COMPOSITIONS tance can only be obtained by co-isolating the polymeric polyacid salt on a polymer Support. This patent application claims the benefit of the earlier filed The performance desired synergistic effect is observed U.S. Patent application Ser. No. 61/212,735 filed on Apr. 15, when the polymeric polyacid acid saltis isolated on a polymer 2009 under 37 CFR 1.55(a). and used in combination with alkyl tin stabilizers and most This invention relates to the thermal stabilization of halo notably with alkyltin stabilizers comprising greater than 25% gen-containing polymer compositions, more particularly, this by weight of the mono alkyl tin mercaptain species. invention relates to a poly(vinyl chloride) (PVC) or a chlori According to one aspect of the present invention, there is nated polyvinyl chloride (cPVC) composition comprising an provided a stabilized halogen containing polymer composi 10 tion comprising: alkyltin stabilizer and at least one salt of a polymeric polyacid a) greater than 40% by weight of a halogenated polymeric material Supported on a polymeric Substrate. material; It is well known that halogen-containing polymers are b) 0.01 to 5.0 phr of an alkyl tin stabilizer comprising a normally susceptible to heat-induced deterioration and that mixture of mono alkyl tin stabilizer and dialkyl tin stabilizer the physical properties of such polymers deteriorate and color 15 wherein the mono alkyl tin stabilizer is greater than 25% by changes take place during processing at elevated tempera weight of the alkyl tin stabilizer; and tures. Undesirable color changes within the polymer often c) 0.01 to 20 phr of a salt of a polymeric polyacid material occur within the first 5 to 15 minutes as well as during later isolated on a polymer stages of thermal processing. Examples of such polymers are According to a second aspect of the present invention, there the vinyl and vinylidene polymers in which the halogen is is provided a stabilized halogen containing polymer compo attached directly to carbon atoms. Poly(vinyl chloride), chlo sition comprising: rinated polyvinyl chloride, polyvinylidene chloride, chlori a) greater than 40% by weight of a halogenated polymer nated polyethylene, polyvinylidene fluoride, copolymers of material wherein the halogenated polymer material com vinyl chloride and poly(vinylidene chloride), are the most prises polymers and copolymers of vinyl chloride, vinyl fluo familiar polymers which require stabilization for their sur 25 ride, vinylidene chloride, and vinylidene fluoride, and chlo vival during fabrication into pipe, window profile, siding, rinated polyvinyl chloride, chlorinated polyethylene or bottles, wall covering, packaging film, foamed trim and the mixtures thereof; like. b) greater than 0.2 phr of a monoalkyl tin stabilizer; and A great deal of work has been done in the development of c) 0.01 to 20 phr of a salt of a polymeric polyacid supported more effective thermal stabilizers and organotin-based heat 30 on a polymer material stabilizers have become one of the most efficient and widely As used herein by "polymeric polyacid.” is meant a poly used stabilizers for rigid PVC. However, the high cost of tin meric material with a MW greater than 1000 containing 2 or metal has significantly impacted the cost performance bal more acidic groups. ance of tin based Stabilizers making them less economically As used herein by “alkyl is meant a hydrocarbon chain attractive. U.S. Pat. No. 5,100.946 seeks to solve the prob 35 As used herein by “phr is meant part per 100 parts of lems of the art by providing a stabilized PVC composition halogenated polymer ie. PVC. containing a stabilizer and at least one metal salt of a carboxy As used herein by “PVC composition' is meant a poly lic acid having at least two carboxyl groups. The reference (vinyl chloride) (PVC) or a chlorinated polyvinyl chloride discloses dibutyl and octyl tin mercaptides and/or alkyl tin (cPVC) composition. Herein, the terms “PVC and “halogen mercaptoesters with sulfide bridges combined with disodium 40 containing polymeric mixture' or the like are used inter adipate salts to produce a stabilized PVC composition. Euro changeably. pean Patent Application 01 07063 discloses the use of sodium As used herein by “hydrocarbyl is meant a hydrocarbon citrate salts with a particle size of less than 30 microns can be group containing carbon and hydrogen. used to stabilize vinyl chloride polymers. In all of these cases, All percentages are weight percentages, and all tempera the sodium adipate and Sodium citrate must be ground to a 45 tures are in C., unless otherwise indicated. Percentages of Small particle size to obtain good dispersiblity and thus good mono alkyl tin stabilizer and dialkyl tin stabilizers are rep performance in the PVC formulation. Even with particles resented as weight percentages of the alkyl tin stabilizer spe ground to less than 30 microns, issues such as haze and cies used. compatibility prevent these sodium salts from being used in As used herein, by “alkyl tin stabilizers” is meant mixtures transparent PVC film applications. Additionally, sodium salts 50 of mono and dialkyltin mercaptains which can be represented that are crystalline and melt at temperatures above 150 C by the following formulas: present additional issues as the use of these materials will lead to plate out in commercial processing operations. Thus a more cost effective and compatible stabilizer would be of R. S1 R R. s.1 R significant value for use in the stabilization of halogen con 55 taining polymers and copolymers such as PVC. VSn / VSn / We have found that the combination of a salt of a polymeric s/ \ K \ polyacid Supported on a polymer Such as a polymeric pro R1 NR NR cessing aid, polymeric impact modifier, polyvinyl chloride Monoalkyl Dialkyl polymer, and an alkyl tin stabilizer improves the performance 60 of the alkyl tin stabilizer and provides a lower cost, higher performance heat stabilizer. Although the use of polymeric where R*-methyl, butyl, octyl, or phenyl hydrocarbyl group, polycarboxylate acid salts such as polyacrylic acid sodium R=is a substituted or unsubstituted hydrocarbyl group, salts have been proposed to stabilize polyvinyl chloride and R=R O C(=O) R, R=R' C(=O) O R, chlorinated polyvinyl chloride in combination with tin stabi 65 where R' is a C-Co hydrocarbyl group and R is a substi lizers, it has now been discovered that important performance tuted or unsubstituted hydrocarbyl group and R is a substi criteria Such as haze, yellowness index and plate out resis tuted or unsubstituted hydrocarbyl group or hydrogen. US 8,614,268 B2 3 4 The present invention relates to a stabilized halogen con Polymer blends useful in the practice of this invention can taining polymer composition. The stabilized halogen-con comprise physical blends of at least two distinct polymeric taining polymer composition comprises a polymeric material species where one of the polymeric species comprises a wherein the polymeric material comprises a halogen contain matrix or continuous phase of the halogen containing poly ing polymeric composition, at least one alkyl tin stabilizer, mer. It is contemplated that the composition of the present and at least one salt of a polymeric polyacid where the poly invention includes embodiments where the halogen contain acid is a carboxylic acid, Sulfonic acid, phosphoric acid, or ing polymeric material is 100 percent of the polymeric blend. phosphonic acid having at least two acidic groups. The non-halogen-containing polymeric material in the poly The polymeric material can be a rigid polymeric material, meric blend may comprise 40% alternatively 25%, or alter or a flexible polymeric material plasticized with a non-chlo 10 rinated plasticizer. By rigid, it is meant that the polymer natively 10% of the halogen containing polymer composi contains substantially no plasticizer.
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