Fast cure aspartate polysiloxane hybrid coating
AssigneeBayer MaterialScience AG
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.
Claims28
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, 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, 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, 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 polysiloxane having a molecular weight in the range of from about 400 to 10,000;
- a solvent;
- and optionally at least one hydrolyzable silane;
- and
- (II) a second Component comprising a prepolymer formed by the reaction of an N-alkoxysilylalkyl-aspartic acid ester and 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 a catalyst.
Dependencies are inferred from the claim text.