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Aminoplast-curable film-forming compositions providing films having resistance to acid etching

  • US 6,245,855 B1
  • Filed: 11/12/1997
  • Issued: 06/12/2001
  • Est. Priority Date: 10/30/1992
  • Status: Expired due to Term
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:

  • 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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