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US 4,906,693 AGranted
Transesterification cure of thermosetting coatings
AssigneeThe Glidden Company
InventorsGary P. Craun, David L. Trumbo
Life of this patent
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Abstract
Transesterification curing of ester polymers and hydroxyl polymers is effected by the inclusion of a transesterification catalyst comprising a catalytic amount of epoxy resin and certain inorganic salts.
Claims18
In a thermosetting coating composition having a polymeric binder comprising an ester polymer chain containing an ester group and a hydroxyl polymer chain containing a hydroxyl group, where the ester functional polymer chain and hydroxyl polymer chain are adapted to be activated to crosslink by transesterification in the presence of a transesterification catalyst;
- said transesterification catalyst comprises between 1 and 20 weight parts of catalytic epoxy compound containing oxirane functionality selected from an oxide or an epoxide, and between 0.1 and 10 weight parts of inorganic salt having a cation selected from sodium, potassium, lithium, calcium, and iron per 100 weight parts of said polymeric binder where said polymeric binder is substantially free of carboxyl functionality and has an Acid No. less than 20;
- and
- where said inorganic salts contain an anion selected from a halogen, azide, cyanide or hydroxide.
Dependencies are inferred from the claim text.