Solid polymer binders for thermosetting powder coating compositi

Stock material or miscellaneous articles – Composite – Of polyamidoester

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4273855, 427386, 4273881, 4273882, 427 27, 427195, 4284231, 528 45, 528 65, 528 85, B32B 2740, B05D 302

Patent

active

044800088

ABSTRACT:
A solid polymer binder for thermosetting powder coating compositions obtained by combining (A) a polyurethane prepolymer containing carboxyl groups and derived from polyisocyanates, hydroxycarboxylic acids and blocking agents different from oximes, containing 1 to 40% by weight of blocked isocyanate groups and having an acid number of 1 to 80, with (B) at least one homo- and/or heterofunctional compound which either contains hydroxyl groups or is capable of forming them by reaction, component (B) being present in an amount such that cross-linked products are formed under stoving conditions, in which the content of COOH-groups is not higher than 1.5% referred to the weight of components (A) and (B), a thermosetting powder composition containing such binder, a metal object coated with such thermosetting powder coating composition, and a process for the manufacture of coatings on metal substrates with such powder coating composition.

REFERENCES:
patent: 3711571 (1973-01-01), Farah
patent: 3846378 (1974-11-01), Griswold
patent: 4252923 (1981-02-01), K/o/ nig et al.

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