Claims
- 1. A powder paint coating composition containing a thermosetting polymeric binder adapted to coreact upon heating, the polymeric binder comprising on a weight basis:
- between 60% and 95% glycidyl functional acrylic copolymer produced by non-aqueous addition copolymerization of ethylenically unsaturated monomers including about 10% to 50% glycidyl monomer, said copolymer having a number average molecular weight between 1,000 and 20,000; and
- between 5% and 40% of a crystalline polyester-urethane crosslinker comprising a mixture of free unreacted dodecanedioic acid and polyester-urethane oligomer having a number average molecular weight between about 250 and 1,000, said crystalline polyester-urethane crosslinker produced by esterifying excess equivalents of dodecanedioic acid with urethane diol to produce said crystalline polyester-urethane crosslinker comprising at least 45% by weight of unreacted dodecanedioic acid, wherein said polyester-urethane oligomer comprises five or less coreacted units of said dodecanedioic acid and said urethane diol.
- 2. The powder coating of claim 1 where the urethane diol is produced by reacting an even number carbon atoms lower alkanol amine with ethylene carbonate.
- 3. The powder coating of claim 2 where the lower alkanol amine is ethanol diamine.
- 4. The powder coating of claim 1 where the crystalline polyester-urethane crosslinker comprises at least about 85% by weight unreacted dodecanedioic acid plus dodecanedioic acid functional polyester-urethane oligomer coating five or less coreactive units of said dodecanedioic acid and said urethane diol.
- 5. The powder coating of claim 4 where the crystalline Polyester-urethane crosslinker comprises the reaction product of dodecanedioic acid and 2-hydroxyethyl urethane of ethanol.
- 6. The powder coating of claim 1 where the crystalline polyester-urethane crosslinker comprises the reaction product of said dodecanedioic acid and said urethane diol on an equivalent ratio between about 3:1 and 6:1.
Parent Case Info
This is a divisional of application Ser. No. 07/880,153, filed on May 5, 1992, now abandoned.
US Referenced Citations (6)
Foreign Referenced Citations (1)
Number |
Date |
Country |
1391863 |
Apr 1975 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
880153 |
May 1992 |
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