High solids acid etch resistant clear coating composition
AssigneeE. I. Du Pont de Nemours and Company
InventorsPeter William Uhlianuk, Ding-Yu Chung, Isidor Hazan
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Abstract
The present invention provides for an etch and mar resistant low VOC clear coating composition most suitable for use as a top clear coat in multi-layered OEM or refinish automative coatings. The coating composition includes isocyanate, silane and melamine components. The isocyanate component includes an aliphatic polyisocyanate. The composition may be formulated as a two-pack or one-pack coating composition, wherein the isocyanante functionalities are blocked with a blocker such as a mono-alcohol.
Claims36
A clear coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities, wherein a VOC of said composition varies in the range of from 0.0 to 0.472 kilogram of an organic solvent per liter of the composition wherein the composition comprises 35 percent to 70 percent of said aliphatic polyisocyanate and 10 percent to 40 percent of said melamine component, all the percentages being based on total weight of composition solids.
A coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities wherein said silane component comprises a silane polymer polymerized from about 30% to 95% by weight of ethylenically unsaturated non-silane containing monomers and about 5% to 70% by weight of ethylenically unsaturated silane containing monomers based on the weight of the silane polymer, said silane containing monomers selected from the group consisting of:
- (a) a silane functional monomer having the structural formula (I):
- wherein R is CH3, CH3CH2, CH3O, or CH3CH2O;
- R1 and R2 are CH3 or CH3CH2;
- and R3 is H, CH3, or CH3CH2;
- and n is 0 or a positive integer from 1 to 10;
- (b) a silane functional monomer having the structural formula (II):
- wherein R is CH3, CH3CH2, CH3O, or CH3CH2O;
- R1 and R2 are CH3 or CH3CH2;
- and n is 0 or a positive integer from 1 to 10;
- (c) a silane functional macromonomer having the structural formula (III):
- wherein R is CH3, CH3CH2, CH3O, or CH3CH2O;
- R1 and R2 are CH3 or CH3CH2;
- R3 is an alkylene group having 1 to 8 carbon atoms;
- R4 is H or CH3;
- and n is a positive integer from 1 to 8;
- (d) acyloxysilane;
- (e) vinylacetoxy silane;
- and
- a combination thereof.
A coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities, wherein said isocyanate component comprises 35 percent to 70 percent of said aliphatic polyisocyanate and 10 percent to 40 percent of said melamine component, all the percentages being based on total weight of composition solids.
A clear coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities, said composition being in the form of a two-pack composition wherein a first-pack of said two-pack composition comprises said isocyanate component and a second-pack of said two-pack composition comprises said melamine and silane components.
A low VOC clear coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities, said composition being in the form of a two-pack composition wherein a first-pack of said two-pack composition comprises said isocyanate component and a second-pack of said two-pack composition comprises said melamine and silane components.
A method of producing a clear coating on a substrate comprising:
- applying a layer of a clear coating composition comprising isocyanate, silane and melamine components wherein said isocyanate component comprises an aliphatic polyisocyanate having on an average 2 to 6 isocyanate functionalities, wherein a VOC of said composition varies in the range of from 0.0 to 0.472 kilogram of an organic solvent per liter of the composition;
- and
- curing said layer into said clear coating.
Dependencies are inferred from the claim text.