Aminoplast-curable film-forming compositions providing films having resistance to acid etching
First Claim
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1. A curable film-forming composition comprising (1) an acrylic polymer containing a plurality of terminal or pendant groups of the structure:
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where R is H or alkyl of 1-18 carbon atoms, the acrylic (co)polymer having an equivalent weight less than 5,000 based on equivalents of said terminal or pendant group; and
(2) an aminoplast crosslinking agent containing methylol and/or methylol ether groups;
said film-forming composition being crosslinkable via direct reaction of said pendant or terminal groups with said methylol and/or methylol ether groups;
said film-forming composition being further characterized as having a calculated hydroxyl value less than 50 based on solid weight of said film-forming composition, excluding any hydroxyl functionality associated with N-methylol groups so as to result in a crosslinked coating which has a substantial number of urethane crosslinks arising from said direct reaction of pendant or terminal groups with said methylol and/or methylol ether groups giving said crosslinked coating a high level of acid etch resistance.
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Abstract
An aminoplast-curable film-forming composition is disclosed. The film-forming composition is a crosslinkable composition comprising (1) a material containing a plurality of carbamate and/or urea functional groups and (2) an aminoplast crosslinking agent. The composition provides a coating with improved acid etch resistance, making the coating particularly useful as an automotive clear coat.
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Citations
6 Claims
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1. A curable film-forming composition comprising (1) an acrylic polymer containing a plurality of terminal or pendant groups of the structure:
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where R is H or alkyl of 1-18 carbon atoms, the acrylic (co)polymer having an equivalent weight less than 5,000 based on equivalents of said terminal or pendant group; and
(2) an aminoplast crosslinking agent containing methylol and/or methylol ether groups;
said film-forming composition being crosslinkable via direct reaction of said pendant or terminal groups with said methylol and/or methylol ether groups;
said film-forming composition being further characterized as having a calculated hydroxyl value less than 50 based on solid weight of said film-forming composition, excluding any hydroxyl functionality associated with N-methylol groups so as to result in a crosslinked coating which has a substantial number of urethane crosslinks arising from said direct reaction of pendant or terminal groups with said methylol and/or methylol ether groups giving said crosslinked coating a high level of acid etch resistance.- View Dependent Claims (2, 3, 4, 5, 6)
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Specification