BASF patents
polyester coil coating,
Patent No. U.S. 7,071,267 B2 BASF Corp. has been granted a patent for a coil coating composition comprised of a first polyester having an hydroxyl number of at least 80 mg KOH/g polyester, prepared by condensation of a polyol component consisting essentially of a flexibilizing diol, a branched diol selected from the group consisting of 2-methyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-2-butyl-1,3-propanediol, propylene glycol, neopentyl glycol, and combinations thereof, and, optionally, a polyol having at least three hydroxyl groups and an acid component consisting essentially of one or more aromatic or cycloaliphatic dicarboxylic acids and, optionally, a polyacid having at least three carboxyl groups, wherein at least one of the polyol having at least three hydroxyl groups or the polyacid having at least three carboxyl groups is included; a second polyester having an hydroxyl number of at least about 44 mg KOH/g polyester, prepared by condensation of a polyol component consisting essentially of a flexibilizing diol and a branched diol selected from the group consisting of 2-methyl-1,3-propanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-2-butyl-1,3-propanediol, propylene glycol, neopentyl glycol, and combinations thereof and an acid component consisting essentially of one or more aromatic or cycloaliphatic dicarboxylic acids; and a crosslinking agent.