Fast cure aspartate polysiloxane hybrid coating
AssigneeCovestro LLC
InventorAhren Olson
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Abstract
The present invention provides a hybrid two component coating composition comprising as component I, (A) an N-alkoxysilylalkyl-aspartic acid ester, (B) a polysiloxane having a molecular weight in the range of from about 400 to 10,000, and optionally (C) at least one hydrolyzable silane; and as component II, (D) a polyisocyanate having an average NCO functionality of 2.5 to 5.5 and an isocyanate content, based on solids, of 9 to 50 wt % and containing aliphatic polyisocyanates; and (E) a catalyst. Methods of making and applying the hybrid coating composition are also provided.
Claims22
A hybrid coating composition containing:
- (I) a first Component comprising (A) an N-alkoxysilylalkyl-aspartic acid ester, (B) a polysiloxane having a molecular weight in the range of from about 400 to 10,000, corresponding to the formula:
- wherein R1 and R6 are each independently selected from the group comprising hydroxyl, alkyl, aryl and alkoxy radicals having up to six carbon atoms, and each R2 is independently selected from the group comprising hydrogen, alkyl and aryl radicals having up to six carbons, and n is selected so that the molecular weight for the polysiloxane is in the range of from about 400 to 10,000 and optionally (C) at least one hydrolyzable silane;
- and
- (II) a second Component comprising (D) a polyisocyanate having an average NCO functionality of 2.0 to 5.5 and an isocyanate content, based on solids, of 2 to 50 wt % and containing aliphatic polyisocyanates;
- and (E) a catalyst.
A substrate coated with a hybrid coating composition containing:
- (I) a first Component comprising (A) an N-alkoxysilylalkyl-aspartic acid ester, (B) a polysiloxane having a molecular weight in the range of from about 400 to 10,000 corresponding to the formula:
- wherein R1 and R6 are each independently selected from the group comprising hydroxyl, alkyl, aryl and alkoxy radicals having up to six carbon atoms, and each R2 is independently selected from the group comprising hydrogen, alkyl and aryl radicals having up to six carbons, and n is selected so that the molecular weight for the polysiloxane is in the range of from about 400 to 10,000, and optionally (C) at least one hydrolyzable silane;
- and
- (II) a second Component comprising (D) a polyisocyanate having an average NCO functionality of 2.0 to 5.5 and an isocyanate content, based on solids, of 2 to 50 wt % and containing aliphatic polyisocyanates;
- and (E) a catalyst.
A method of coating a substrate, the method comprising the step of pre-mixing and applying Components I and II of a hybrid coating composition to a substrate, wherein the hybrid coating composition contains:
- (I) a first Component comprising (A) an N-alkoxysilylalkyl-aspartic acid ester, (B) a polysiloxane having a molecular weight in the range of from about 400 to 10,000 corresponding to the formula:
- wherein R1 and R6 are each independently selected from the group comprising hydroxyl, alkyl, aryl and alkoxy radicals having up to six carbon atoms, and each R2 is independently selected from the group comprising hydrogen, alkyl and aryl radicals having up to six carbons, and n is selected so that the molecular weight for the polysiloxane is in the range of from about 400 to 10,000, and (C) at least one hydrolyzable silane;
- and
- (II) a second Component comprising (D) a polyisocyanate having an average NCO functionality of 2.0 to 5.5 and an isocyanate content, based on solids, of 2 to 50 wt % and containing aliphatic polyisocyanates;
- and (E) a catalyst.
A hybrid coating composition containing:
- (I) a first Component comprising (A) an N-alkoxysilylalkyl-aspartic acid ester, (B) a polysiloxane having a molecular weight in the range of from about 400 to 10,000, corresponding to the formula:
- wherein R1 is methyl and R6 is phenyl, and each R2 is methyl, and n is selected so that the molecular weight for the polysiloxane is in the range of from about 400 to 10,000 and optionally (C) at least one hydrolyzable silane;
- and
- (II) a second Component comprising (D) a polyisocyanate having an average NCO functionality of 2.0 to 5.5 and an isocyanate content, based on solids, of 2 to 50 wt % and containing aliphatic polyisocyanates;
- and (E) a catalyst.
Dependencies are inferred from the claim text.