HAPs free coating composition and film thereof
A coating composition is used to form a film on a substrate. The coating composition includes a polyester, a cross-linking agent reactive with the polyester, and a solvent package substantially free of hazardous air pollutants. The solvent package includes a first solvent, a second solvent, and a third solvent. The first, second, and third solvents in the solvent package have boiling points of less than 300° F., of from 300° F. to 340° F., and of greater than 340° F., respectively. The first, second, and third solvents are also present in amounts of from 10 to 25 parts, of at least 50 parts, and of from 5 to 20 parts, by weight, per 100 parts by weight of the solvent package, respectively. The first, second, and third solvents improve properties of the coating composition and of films formed from the coating composition.
1 . A coating composition substantially free of hazardous air pollutants and comprising:
A. a polyester;
B. a cross-linking agent reactive with said polyester; and
C. a solvent package substantially free of hazardous air pollutants and comprising;
(i) a first solvent having a boiling point of less than 300° F. and present in an amount of from 10 to 25 parts by weight per 100 parts by weight of said solvent package,
(ii) a second solvent having a boiling point of from 300° F. to 340° F. and present in an amount of at least 50 parts by weight per 100 parts by weight of said solvent package, and
(iii) a third solvent having a boiling point of greater than 340° F. and present in an amount of from 5 to 20 parts by weight per 100 parts by weight of said solvent package;
2 . A coating composition as set forth in claim 1 wherein said first solvent is present in an amount of from 12 to 22 parts by weight per 100 parts by weight of said solvent package.
3 . A coating composition as set forth in claim 2 wherein said second solvent is present in an amount of from 50 to 75 parts by weight per 100 parts by weight of said solvent package.
4 . A coating composition as set forth in claim 3 wherein said third solvent is present in an amount of from 10 to 20 parts by weight per 100 parts by weight of said solvent package.
5 . A coating composition as set forth in claim 1 wherein said first solvent has a boiling point of from 150° F. to 300° F. and said third solvent has a boiling point of from 345° F. to 415° F.
6 . A coating composition as set forth in claim 1 wherein said first solvent is selected from the group of acetates, alcohols, and combinations thereof.
7 . A coating composition as set forth in claim 1 wherein said second solvent is selected from the group of aromatics, ethers, and combinations thereof.
8 . A coating composition as set forth in claim 1 wherein said third solvent is selected from the group of aromatics, ethers, esters, alcohols, and combinations thereof.
9 . A coating composition as set forth in claim 1 wherein said polyester comprises the reaction product of:
A. 2,2,4-trimethyl-1,3-pentanediol;
B. isophthalic acid; and
C. adipic acid;
reacted in the presence of a catalyst.
10 . A coating composition as set forth in claim 1 wherein said polyester is present in an amount of from 20 to 30 parts by weight per 100 parts by weight of said composition.
11 . A coating composition as set forth in claim 1 wherein said cross-linking agent comprises a melamine formaldehyde resin.
12 . A coating composition as set forth in claim 1 wherein said cross-linking agent is selected from the group of aminoplasts, phenolic adducts, siloxanes, silanes, alkylols, isocyanates, acrylics, anhydrides, and combinations thereof.
13 . A coating composition as set forth in claim 1 wherein said cross-linking agent is present in an amount of from 8 to 12 parts by weight per 100 parts by weight of said coating composition.
14 . A coating composition as set forth in claim 1 further comprising at least one catalyst in an amount of 0.1 to 0.9 parts by weight based on 100 parts by weight of said coating composition.
15 . A coating composition as set forth in claim 1 further comprising at least one additive selected from the group consisting of leveling agents, surfactants, fillers, stabilizers, plasticizers, defoaming agents, wetting additives, rheology controlling agents, pigments, flattening agents, anti-settling agents, anti-popping agents, UV absorbers, and combinations thereof.
16 . A coating composition as set forth in claim 1 having a content of hazardous air pollutants of less than 0.1 % by weight of said composition for hazardous air pollutants categorized as carcinogenic by the Environmental Protection Agency according to the Clean Air Act Section 112(b)(1).
17 . A coating composition as set forth in claim 1 having a content of hazardous air pollutants of less than 1% by weight of said composition for hazardous air pollutants not categorized as carcinogenic by the Environmental Protection Agency according to the Clean Air Act Section 112(b)(1).
18 . A coating composition as set forth in claim 1 having a viscosity of from 25 to 30 seconds determined utilizing a 2-Zahn cup at 25° C.
19 . A process for coating a substrate utilizing said coating composition as set forth in claim 1 .
20 . A coating composition as set forth in claim 1 wherein said first solvent is present in an amount of from 12 to 22 parts by weight per 100 parts by weight of said solvent package, said second solvent is present in an amount of from 50 to 75 parts by weight per 100 parts by weight of said solvent package, said third solvent is present in an amount of from 10 to 20 parts by weight per 100 parts by weight of said solvent package, said polyester comprises the reaction product of 2,2,4-trimethyl-1,3-pentanediol, isophthalic acid, and adipic acid, reacted in the presence of a catalyst, and said cross-linking agent comprises a melamine formaldehyde resin.
21 . A film comprising a single layer formed from said coating composition of claim 1.