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||||||||| US005478491A United States Patent 19 11 Patent Number: 5,478,491 Jarema (45) Date of Patent: * Dec. 26, 1995 5,288,335 2/1994 Stevens ..................................... 134/38 54) NMPID-LIMONENE PAINT STRIPPER WITH EWAPORATION INHIBITOR 5,298,184 3/1994 Jarema .. ... 252/171 5,334,331 8/1994 Fusiak ..................................... 252/542 75 Inventor: Chester P. Jarema, Sterling Heights, FOREIGN PATENT DOCUMENTS Mich. 16060 of 1903 United Kingdom. 73) Assignee: Specialty Environmental Technologies, Inc., Auburn Hills, Mich. OTHER PUBLICATIONS “Technical Information, N-Methyl Pyrrolidone Handling * Notice: The portion of the term of this patent and Storage', BASF, Date of publication unavailable. subsequent to Mar. 29, 2011, has been "The Safety, Toxicology, and Biodegradation of disclaimed. d-Limonene', Florida Chemical Company, Inc. (Revised Jan. 30, 1989). 21 Appl. No.: 263,778 "D-Limonene', Florida Chemical Company, Inc. (Jun. 24, 1991). 22 Filed: Jun. 23, 1994 "Material Safety Data Sheet, N-Methyl-Pyrrollidone', Related U.S. Application Data Amcor Industries, Inc. (Mar. 19, 1992). "Non-Flammable Paint Stripers', Allied Chemical and Dye 63 Continuation-in-part of Ser. No. 194,496, Feb. 10, 1994, Pat. Corporation, Date of publication unavailable. No. 5,468,415, which is a continuation of Ser. No. 911,188, Wax definition-Hauoley's Condensed Chemical Dictio Jul. 9, 1992, Pat. No. 5,298,184. nary, Eleventh Edition, Date of publication unavailable. Beeswax definition-Hauoley's Condensed Chemical Dic (51) Int. Cl.' ................................ C11D 7122; C11D 7/26; tionary, Eleventh Edition, Date of publication unavailable. C11D 7/32; C09D 9/00 Carnauba Wax Definition-Hauoley's Condensed Chemical 52 U.S. Cl........................... 252/171; 252/162; 252/163; Dictionary, Eleventh Edition, Date of publication unavail 252/170; 252/DIG. 8; 252/542; 134/38 able. 58) Field of Search ..................................... 252/163, 171, Sonneborn petrolatums Brochure, Date of publication 252/162, 170, DIG. 8,542; 134/38 unavailable. Material Safety Data Sheet for Parascal Wax, Date of 56) References Cited publication unavailable. U.S. PATENT DOCUMENTS "Shell paraffin and microcrystalline waxes: Shellwax(8” Technical Bulletin Shell Oil Company, Date of publication 3,979,219 9/1976 Chang et al. ........................... 206/271 unavailable. 3,983,047 9/1976 Vinson .................................... 252/19 4,120,810 10/1978 Palmer .................................... 252,153 "Sonneborn microcrystalline waxes: Advantages and appli 4,269,724 5/1981 Hodson ................................... 252/171 cations.” Date of publication unavailable. 4,428,871 1/1984 Ward et al. ............................. 252,542 Quantum Chemical Corporation, Material Safety Data Sheet 4,445,939 5/1984 Hodson ....................................... 13412 for Emery 1656 Lanolins, Date of publication unavailable. 4,533,487 8/1985 Jones ....................................... 252,170 4,620,937 11/1986 Dellutri................................... 252/143 Primary Examiner-Linda Skaling Therkorn 4,666,626 5/1987 Francisco ................................ 252/53 Assistant Examiner-Michael P. Tierney 4,749,510 6/1988 Nelson .................................... 252A166 Attorney, Agent, or Firm-Harness, Dickey & Pierce 4,764,222 8/1988 Colegrove ................................. 234/38 4,865,758 971989 Carter ...................................... 252/171 57 ABSTRACT 5,006,279 4/1991 Grobbel .................................. 252/542 5,011,621 4/1991 Sullivan .................................. 252/62 Compositions according to the present invention include as 5,035,829 7/1991 Suwala .................................... 252/70 essential components: from about 10% to about 50% by 5,049,300 9/1991 Fusiak et al. ... 252,162 weight of d-limonene, from about 50% to about 90% by 5,098,591 3/1992 Stevens ............. ... 252A162 weight of N-methyl pyrrollidone, and from about 0% to 5,098,592 3/1992 Narayanan et al. ... 252A162 about 10% by weight of a thickener and from about 0.5% to 5, 112,516 5/1992 Koetzle ............. ... 252,162 about 5% of an evaporation inhibiting agent such as wax. 5,124,062 6/1992 Stevens ............. ... 252A162 5,154,848 10/1992 Narayanan et al. ... 252/62 5,167,853 12/1992 Stevens ................................... 252/162 21 Claims, No Drawings 5,478,491 1. 2 sition. However, each of the above formulations still pre NMPID-L MONENE PAINT STRIPPER WITH sents a dermal safety hazard due to the low pH of the formic EVAPORATION INHIBITOR acid (pH=2.3) and other components. U.S. Pat. No. 5,006,279 discloses a paint stripper com position which includes NMP and at least one mononuclear RELATED APPLICATIONS aromatic hydrocarbon. Similarly, U.S. Pat. Nos. 4,120,810; This application is a continuation-in part of U.S. patent 4,749,510; and 4,666,626 contain aromatic hydrocarbons application Ser. No. 08/194,496, filed Feb. 10, 1994, entitled within the formulation. "Paint Stripper Composition', now U.S. Pat. No. 5,468, These and other formulations, however, may still present 415.; which in turn is a continuation of U.S. patent appli 10 potential health, safety, and dermal hazards based on the cation Ser. No. 07/911,188, filed Jul. 9, 1992, entitled "Paint absorption rate of the particular aromatic hydrocarbon or Stripper Composition", now U.S. Pat. No. 5,298,184. aromatic solvent used. In addition, many aromatic hydro carbons are believed to be carcinogenic, pose environmental BACKGROUND OF THE INVENTION concerns, and are troublesome regarding disposal of spent 15 chemicals. 1. Field of the Invention U.S. Pat. No. 5,011,621, which issued to Sullivan, relates The present invention relates to a paint stripper compo to mixtures of NMP, selected co-solvents (which may sition for the removal of cured or partially cured paint include aromatic hydrocarbons and terpenes such as d-li materials from substrates. More specifically, the invention monene), as well as animal and/or vegetable oil as a means relates to an improved paint stripper containing a combina 20 to effectively remove paint from substrates. However, the tion of N-methyl-2-pyrrollidone (NMP) and d-limonene for presence of one or more of these natural components such as effective paint removal and a more pleasing aroma than tallows and fatty acids may lead to the growth of microbio other known paint stripping compositions. Still more spe logical organisms within the formulation, thereby decreas cifically, the present application relates to an NMP/d-li ing the "shelf life” of the product. The presence of micro monene paint stripper which has evaporation inhibitors for 25 biological organisms could lead to altered product reducing evaporation of the active stripper components. performance as well as a noxious and rancid odor, especially 2. Description of Relevant Art when the product is exposed to sunlight. The term "paint' as hereafter used refers to coatings such The paint stripper of my prior U.S. Pat. No. 5,298, 184 as epoxies, enamels, latexes, primers, basecoats, clearcoats, 30 provides an effective improvement in paint stripper technol lacquers, varnishes, shellacs and polyurethane finishes used ogy. However, it has been found that in outdoor or other to protect and/or beautify substrates. As used herein, the situations where large volumes of air, heat and/or sunlight term "paint stripper” refers to compositions which remove are prevalent, the effectiveness was reduced due to unac or facilitate the removal of a paint, as defined above, from ceptable levels of evaporation of the product. This problem a substrate. Chemical based paint strippers have enjoyed 35 is also prevalent in the prior NMP-type strippers. widespread commercial application due to their relative ease Heretofore, evaporative inhibitors have been utilized in of use over various physical scraping and/or sanding meth methylene chloride systems. Such inhibitors include sol ods of paint removal. Many of these paint strippers are vated waxes or the like which form heavy films or a solvent based, utilizing methylene chloride, methanol, or gelatinous coat on the exposed surface of the stripper upon butanol, among others, as solvent components. While these 40 being applied to a paint substrate to reduce evaporation. solvents yield significant paint removal, they also present However, such waxes have not been found to be useful in potential health, safety, and environmental concerns to both NMP based strippers because it is known that useful waxes, the user and the surrounding environment. such as paraffin, are not soluble in NMP. Thus, even though U.S. Pat. No. 2,507,983 discloses a paint stripper which the NMP strippers have had evaporation problems, such as contains methylene chloride and methylcellulose, a thick 45 that mentioned above, it has been generally accepted by ening agent used to increase the viscosity of the formulation. those in the art that waxes are not soluble in NMP, and Methylene chloride is an effective low-cost paint stripper therefore, the use of waxes has been rejected in these characterized by high vapor pressure (400 mm Hg at 75°F) strippers. Thus, there remains a need to provide an NMP which causes it to evaporate very rapidly. This high vapor stripper composition which has reduced evaporation. pressure leads to an extreme vapor inhalation hazard. In 50 There also remains a need in the art to provide an effective addition, methylene chloride is a suspected carcinogen as stripper which has