High solids internally U.V. stabilized melamine cured urethane p

Details High solids internally U.V. stabilized melamine cured urethane p High solids internally U.V. stabilized melamine cured urethane p

1982-07-22

1983-06-07

Welsh, Maurice J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525509, 525520, 528 49, 528 51, 528 60, 528 66, 528 73, C08G 1838

Patent

active

043871941

ABSTRACT:
Novel, low viscosity, high solids paint compositions have been created which provide durable, high gloss surface finishes when they are applied to and cured over suitable substrates. The paints are based on urethane binder resins formed by initially reacting a hindered piperidinol ultraviolet stabilizer with a stoichiometric excess of aliphatic polyisocyanate. This reaction product is in turn reacted with a stoichiometric excess of polyether polyols. The paint compositions are cured by crosslinking the urethane binder resins at the unreacted functional hydroxyl groups of the polyol constituents by means of acid catalyzed, melamine formaldehyde crosslinking agents. Cure can generally be fully accomplished in a short time at temperatures below about 250.degree. F. The cured paint has piperidine groups chemically incorporated within its molecular structure to effectively inhibit the degradation of the urethane linkages and the loss of gloss by ultraviolet radiation.

REFERENCES:
patent: 4243792 (1981-01-01), Short

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