Temporary removable solvent based protective coating

Abstract

This invention is for a composition of clear or pigmented coating that is temporary and removable. It is especially designed to protect the surface of an automobile from the damaging effects of the environment and also from damage caused by normal daily use. The coating is a composition of 40 to 80% of cellulose acetate butyrate ester, 15 to 60% of an acrylic polymer and 2 to 10% of a sucrose acetate isobutyrate. The remover is a combination of tetrahydrofurfuryl alcohol, dibasic ester, diacetone alcohol, ethyl 3 ethoxypropionate; 2,2,4 trimethyl-1,3 pentanoldiol monoisobutyrate, and white mineral oil.

1 . A process for making, applying and removing a temporary removable top coat to a substrate which comprises the steps of:
 A. First mixing the following ingredients to form a top coat in the following percentages by dry weight of the top coat:
 i. from 40 to 80% of cellulose acetate butyrate ester; 
 ii. from 15 to 60% of an acrylic polymer; and 
 iii. from 2 to 10% of sucrose acetate isobutyrate; 
   
       with a solvent largely composed of lower molecular weight alcohols;
 B. Applying the top coat formed in (A.) to a substrate and drying the top coat; and 
 C. When desired, removing the temporary removable top coat from the substrate to which it was applied without damaging the substrate by using a mixture of the following ingredients:
 i. from 50 to 80% by weight of the ingredients in (C.) of tetrahydrofurfuryl alcohol; 
 ii. from 5 to 20% by weight of the ingredients in (C.) of dibasic ester; 
 iii. from 1 to 12% by weight of the ingredients in (C.) of diacetone alcohol; 
 iv. from 1 to 12% by weight of the ingredients in (C.) of the ethyl 3 ethoxypropionate; 
 v. from 1 to 12% by weight of the ingredients in (C.) of the 2,2,4 trimethyl-1,3 pentanoldiol monoisobutyrate; and 
 vi. from 1 to 10% by weight of the ingredients in (C.) of white mineral oil; 
 
 
       said remover is applied to the temporary removable top coat and allowed to dissolve it and then is removed from the substrate along with the top coat. 
     
     
         2 . The process of  claim 1  in which the acrylic polymer (A.) (ii.) is a combination of two copolymers formed from n-butyl methacrylate and methyl methacrylate. 
     
     
         3 . The process of  claim 1  in which the cellulose acetate butyrate ester (A.) (i) is used in an amount of approximately 68% by dry weight of the top coat and the sucrose acetate isobutyrate (A.) (ii.) is used in an amount of approximately 5% by dry weight of the top coat. 
     
     
         4 . The process of  claim 1  in which the cellulose acetate butyrate ester (A.) (i.) is used in an amount of approximately 68% by dry weight of the top coat and the acrylic polymer (A.) (ii.) is a combination of a higher molecular weight methyl methacrylate and n-butyl methacrylate copolymer in an amount of approximately 15% by dry weight of the top coat and a mixture of lower molecular weight copolymer of methyl methacrylate and n-butyl methacrylate in an amount of approximately 10% by dry weight of the top coat and the sucrose acetate isobutyrate (A.) (iii.) is used in an amount of approximately 5% by dry weight of the top coat and a flow improver is used in an amount of approximately 0.5% of dry weight of the top coat. 
     
     
         5 . The process of  claim 4  in which the cellulose acetate butyrate ester (A.) (i.) has a hydroxyl content of approximately 3 to 6% by weight. 
     
     
         6 . The process of  claim 1  in which the solvent (A.) is a combination of ethyl alcohol, isopropyl alcohol, diacetone alcohol, ethyl 3 ethoxypropionate, propylene glycol monomethyl ether acetate and tetrahydrofurfuryl alcohol. 
     
     
         7 . The process of  claim 1  in which the solvent (A.) is a combination of ethyl alcohol present in an amount of from approximately 20 to 30% by wet weight of the solvent and the top coat ingredients, isopropyl alcohol in an amount of from approximately 10 to 12% by wet weight, diacetone alcohol in an amount of from approximately 10 to 20% by wet weight, ethyl 3 ethoxypropionate in an amount of from approximately 2 to 5% by wet weight, propylene glycol monomethyl ether acetate in an amount of from approximately 10 to 20% by wet weight and tetrahydrofurfuryl alcohol in an amount of from approximately 2 to 5% by wet weight. 
     
     
         8 . The process of  claim 4  in which the solvent is a combination of ethyl alcohol present in an amount of from approximately 20 to 30% by wet weight of the solvent and the top coat ingredients, isopropyl alcohol in an amount of from approximately 10 to 12% by wet weight, diacetone alcohol in an amount of from approximately 10 to 20% by wet weight, ethyl 3 ethoxypropionate in an amount of from approximately 2 to 5% by wet weight, propylene glycol monomethyl ether acetate in an amount of from approximately 10 to 20% by wet weight and tetrahydrofurfuryl alcohol in an amount of from approximately 2 to 5% by wet weight. 
     
     
         9 . The process of  claim 4  in which the solvent is a combination of ethyl alcohol present in an amount of approximately 26% by wet weight of the solvent and the top coat ingredients, isopropyl alcohol in an amount of approximately 11% by wet weight, diacetone alcohol in an amount of approximately 15% by wet weight, ethyl 3 ethoxypropionate in an amount of approximately 4% by wet weight, propylene glycol monomethyl ether acetate in an amount of approximately 15% by wet weight and tetrahydrofurfuryl alcohol in an amount of approximately 4% by wet weight. 
     
     
         10 . The process of  claim 1  in which the tetrahydrofurfuryl alcohol (C.) (i.) is present in an amount of approximately 66% of the ingredients of (C.), the dibasic ester (C.) (ii.) in an amount of 10% of the ingredients of (C.) the diacetone alcohol (C.) (iii.) is present in an amount of 6% by weight of the ingredients of (C.), the ethyl 3 ethoxypropionate (C.) (iv.) in an amount of approximately 6% of the ingredients of (C.), the 2,2,4 trimethyl-1,3 pentanoldiol monoisobutyrate (C.) (v.) is present in an amount of 6% by weight of the ingredients of (C.), and the white mineral oil (C.) (vi.) is present in an amount of 5% by weight of the ingredients of (C.), and a surfactant in an amount of approximately 0.5% of the ingredients of (C.) and a thickening agent in an amount of approximately of 0.5% of the ingredients of (C.) are added to the ingredients of (C.). 
     
     
         11 . The process of  claim 9  in which the tetrahydrofurfuryl alcohol (C.) (i.) is present in an amount of approximately 66% of the ingredients of (C.), the dibasic ester (C.) (ii.) in an amount of 10% of the ingredients of (C.) the diacetone alcohol (C.) (iii.) is present in an amount of 6% by weight of the ingredients of (C.), the ethyl 3 ethoxypropionate (C.) (iv.) in an amount of approximately 6% of the ingredients of (C.), the 2,2,4 trimethyl-1,3 pentanoldiol monoisobutyrate (C.) (v.) is present in an amount of 6% by weight of the ingredients of (C.), and the white mineral oil (C.) (vi.) is present in an amount of 5% by weight of the ingredients of (C.), and a surfactant in an amount of approximately 0.5% of the ingredients of (C.) and a thickening agent in an amount of approximately of 0.5% of the ingredients of (C.) are added to the ingredients of (C.). 
     
     
         12 . The process of  claim 1  in which a flow improver is added to the ingredients in (A.) in an amount of from 0.1 to 1% by weight of (A.). 
     
     
         13 . The process of  claim 12  in which the flow improver is polydimethylsiloxane. 
     
     
         14 . The process of  claim 1  in which a light stabilizer is added to the ingredients in (A.) in an amount of from 0.1% to 2% by weight of (A.). 
     
     
         15 . The process of  claim 14  in which the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and benzotriazole. 
     
     
         16 . An easily removable top coat that comprises the following ingredients in the following percentages by weight of the top coat:
 A. 40 to 80% by weight of cellulose acetate butyrate ester;   B. from 15 to 60% of an acrylic polymer; and   C. from 2 to 10% of sucrose acetate isobutyrate.   
     
     
         17 . The top coat of  claim 16  in which the cellulose acetate butyrate ester (A.) has a hydroxyl content of approximately 5% by weight and the acrylic polymer (B.) is a combination of copolymers formed from methyl methacrylate and n-butyl methacrylate. 
     
     
         18 . The top coat of  claim 16  in which the cellulose acetate butyrate ester (A.) is present in an amount of approximately 66% by weight of the top coat and the acrylic (B.) is a combination of methyl methacrylate and n-butyl methacrylate high MW copolymer which is present in an amount of approximately 15% by weight of the top coat and the low MW copolymer of n-butyl methacrylate and methyl methacrylate, which is present in an amount of 10% by weight of the top coat and the sucrose acetate isobutyrate (C.) is present in an amount of approximately 5% by weight of the top coat. 
     
     
         19 . The top coat of  claim 16  in which the cellulose acetate butyrate ester (A.) has a hydroxyl content of approximately 3 to 6% by weight. 
     
     
         20 . The top coat of  claim 16  in which a flow improver is added to the ingredients in an amount of from 0.1 to 1% by weight of the ingredients. 
     
     
         21 . The top coat of  claim 20  in which the flow improver is polydimethylsiloxane. 
     
     
         22 . The top coat of  claim 16  in which a light stabilizer is added in an amount of from 0.11% to 2% by weight of the ingredients. 
     
     
         23 . The top coat of  claim 22  in which the light stabilizer is a mixture of bis(1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and methyl (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate and benzotriazole. 
     
     
         24 . A solution which contains:
 (A) A mixture based upon the dry film weight of a mixture of the following:
 (i) approximately 66% of cellulose acetate butyrate ester; 
 (ii) approximately 15% of an n-butyl methacrylate and methyl methacrylate high MW copolymer; 
 (iii) approximately 10% by weight of a methyl methacrylate and n-butyl acrylate low MW copolymer; 
 (iv) approximately 5% by weight of sucrose acetate isobutyrate; and 
   (B) A solvent composed of the following ingredients based upon the wet weight of the solution including the mixture in:
 (i) from 20 to 30% of ethyl alcohol; 
 (ii) from 10 to 12% of isopropyl alcohol; 
 (iii) from 10 to 20% of diacetone alcohol; 
 (iv) from 2 to 5% of ethyl 3 ethoxypropionate; 
 (v) from 10 to 20% of propylene glycol monomethyl ether acetate; and 
 (vi) from 2 to 5% of tetrahydrofurfuryl alcohol. 
   
     
     
         25 . The solution of  claim 24  in which the cellulose acetate butyrate ester (A.) (i.) has a hydroxyl content of approximately 3 to 6% by weight. 
     
     
         26 . The process of  claim 1  in which a surfactant is added to the ingredients in (C.) in an amount of from 0.25 to 1% by weight and a thickening agent is added to the ingredients in (C.) in an amount of from 0.25 to 1.5% by weight.