Curable film-forming compositions containing amide functional polymers
US5780559A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 22, 1996 |
| Grant date | Jul 14, 1998 |
| Priority date | — |
| Expiry date | Jul 22, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L61/20
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A film-forming composition is provided comprising: (i) an amide functional polymer, copolymer or oligomer selected from (a) acrylic polymers, (b) polyesters, (c) polyurethanes, (d) polyethers or (e) mixtures thereof; and (ii) an aminoplast crosslinking agent containing methylol and/or methylol ether groups. The acrylic polymers have a plurality of groups of at least one of the structures: ##STR1## wherein n is 0 or 1, R.sub.1 is hydrogen or methyl, R.sub.2 is a divalent linking group having about 1 to 30 carbon atoms when the group is of the first structure, or R.sub.2 is alkylene having about 2 to 13 carbon atoms when the group is of structure II, and R.sub.3 is hydrogen or lower alkyl having 1 to 4 carbon atoms. The (b), (c), and (d) polymers each have a plurality of terminal amide groups. The film-forming composition prior to curing has a theoretical hydroxyl value less than about 50 based on total resin solid weight of the film-forming composition, excluding any hydroxyl functionality associated with N-methylol groups. After curing, the film-forming composition exhibits a high level of acid etch resistance. The film forming composition can also be the clear film-forming composi…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.