Polyurethane resin coating composition
AssigneeGeneral Electric Company
InventorAustin A. Wolfrey
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Abstract
Two-package waterborne polyurethane resin coating compositions which, when applied to a solid substrate produce an adherent, abrasion resistant coating thereon, are disclosed herein. The coating compositions essentially include a small amount of N-methylpyrrolidone to improve adhesion to non-polar thermoplastic substances and are prepared by providing a carboxyl group-containing polyurethane in aqueous dispersion and, optionally, a water dispersible acrylic, as a first part; and using a trifunctional aziridine compound to make the second part of the two package system.
Claims11
A two-package aqueous coating composition comprising as
- Part A
- (i) a carboxyl group-containing urethane prepolymer, said prepolymer being dispersed in
- (ii) a polar liquid medium comprising predominantly water;
- and as
- Part B
- a trifunctional aziridine compound, said compound being adapted to react with said urethane prepolymer to cross-link the same;
- and
- a minor, effective amount of N-methylpyrrolidone, sufficient to enhance the adhesion of a coating prepared from such composition to a non-polar thermoplastic substrate.
Dependencies are inferred from the claim text.