Blocked isocyanate crosslinkers based on pentaerythritol for use in thermosetting coatings
AssigneeFerro Corporation
InventorAlistair J. Ross
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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.
Claims13
A thermosetting coating comprising the reaction product of (A) at least one hydroxyl containing polymer and (B) a blocked isocyanate crosslinking agent comprising the reaction product of (1) (a) pentaerythritol or (b) a mixture of pentaerythritol and a diol or a triol, (2) at least one blocking agent and (3) at least one diisocyanate.
A thermosetting coating comprising the reaction product of (A) at least one hydroxyl containing polymer and (B) a blocked isocyanate crosslinking agent comprising the reaction product of (1) pentaerythritol or a mixture of pentaerythritol and a glycol, (2) a lactam blocking agent and 3) a diisocyanate.
A thermosetting powder coating composition comprising (A) at least one hydroxyl containing polymer and (B) a blocked isocyanate crosslinking agent comprising the reaction product of (1)(a) pentaerythritol or (b) a mixture of pentaerythritol and a diol or a triol, (2) at least one blocking agent and (3) at least one diisocyanate.
Dependencies are inferred from the claim text.