Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1994-01-06
1996-09-10
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525440, 525457, 525528, 528 45, 528 53, 528 60, 528 73, 528 75, 528 80, 528 83, 528 84, 528 85, C08F 830
Patent
active
055546927
ABSTRACT:
The present invention concerns blocked isocyanate crosslinkers based on pentaerythritol for use in thermosetting coatings. More particularly, the invention pertains to thermosetting protective coatings containing a coreactive binder polymer comprising a hydroxyl functional matrix polymer adapted to coreact with a blocked isocyanate comprising pentaerythritol reacted with excess equivalents of isocyanate where excess isocyanate groups are blocked with a blocking agent. Pentaerythritol comprises between about 20% and 100% by weight of the polyol reactants reacted with excess isocyanate groups while the blocked crosslinker comprises between about 10% and 50% by weight of the thermosetting binder components. The preferred thermosetting coating is powder coating.
REFERENCES:
patent: 3822240 (1974-07-01), Schmitt et al.
patent: 3931117 (1976-01-01), Leonard
patent: 4302351 (1981-11-01), Gras et al.
patent: 4354014 (1982-10-01), Wolf et al.
patent: 4522923 (1981-02-01), K onig et al.
Cooney Jr. John M.
Ferro Corporation
Seidleck James J.
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