Appeal No. 97-1848
Application 08/338,074
where X is )O and R is H; and[2]
(2) 10 to 50 percent by weight based on weight of
resin solids in the film-forming composition of an
aminoplast crosslinking agent containing methylol and/or
methylol ether groups;
[a] said film-forming composition being
crosslinkable through reaction of said pendant or
terminal groups with said methylol and/or methylol ether
groups;
[b] 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
[c] so as to result in a crosslinked coating
which has a substantial number of urethane crosslinks
arising from said reaction of pendant or terminal groups
with said methylol and/or methylol ether groups,
[d] giving said crosslinked coating a high
level of acid etch resistance.
Given that X can only be O (oxygen) and R can only be H (hydrogen), one wonders2
why the formula is not set out simply as:
H
*
O)C)N)H or O)C)NH2
5 5
O O
thereby eliminating any need to refer to X or R.
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Last modified: November 3, 2007