Lacquer coatings for polyurethane-molded articles

Claim 2

An in-mold lacquer coating for a polyurethane-molded article, which coating is mold-releasable without the aid of an external mold release agent and is re-coatable after de-molding without additional surface preparation, comprising a mixture of a fully-reacted aliphatic polyurethane resin, a polydimethylsiloxane fluid, and a solvent system that is incompatible with said polydimethylsiloxane, having toluene, an acetate solvent, a glycol ether solvent, and alcohol solvents as discrete constituents thereof, which constituents have specific gravities less than said polydimethylsiloxane and have varying rates of evaporation such that the ratio of toluene to the acetate, glycol ether, and alcohol solvent constituents in said solvent system decreases as the constituents of said solvent system evaporate.

Claim 3

The lacquer coating of claim 1 wherein said fully-reacted aliphatic polyurethane resin includes a polyester extended aliphatic urethane elastomer present in about 3.0-17.00 weight percent.

Claim 4

The lacquer coating of claim 2 wherein said polydimethylsiloxane is present in about 0.15 to 1.15 weight percent.

Claim 5

The lacquer coating of claim 3 wherein said solvent system includes isopropanol, present in about 15.0 to 50.0 weight percent.

Claim 6

The lacquer coating of claim 3 wherein said solvent system includes toluene present in about 15.0% to 60.0 weight percent.

Claim 7

The lacquer coating of claim 3 wherein said solvent system includes methanol present in about 1.0 to 30.0 weight percent.

Claim 8

The lacquer coating of claim 3 wherein said solvent system includes propoxypropanol present in about 0.0 to 20.0 weight percent.

Claim 9

The lacquer coating of claim 3 wherein said solvent system includes ethyl acetate present in about 2.0 to 25.0 weight percent.

Claim 10

The lacquer coating of claim 3 wherein said solvent system includes ethylene glycol monobutyl ether present in about 0.0 to 15.0 weight percent.

Claim 11

The lacquer coating of claim 1 and further including in said solvent system a pigment dispersion present in about 2.0 to 15.0 weight percent, having dispersion solvents that do not destroy the incompatibility of said solvent system with said polydimethylsiloxane yet are compatible with other constituents of said solvent system so as to provide color consistency in the lacquer coating.

Claim 12

An in-mold lacquer, coating for a polyurethane-molded article, which coating is mold-releasable without the aid of an external mold release agent and is re-coatable after de-molding without additional surface preparation, comprising a mixture of a fully-reacted aliphatic polyurethane resin present in about 3.0 to 17.0 weight percent, a polydimethylsiloxane fluid present in about 0.15 to 1.15 weight percent, and a solvent system that is incompatible with said polydimethylsiloxane, having toluene present in about 15.0 to 60.0 weight percent, ethyl acetate present in about 2.0 to 25.0 weight percent, methanol present in about 1.0 to 30.0 wight percent, isopropanol present in about 15.0 to 50.0 weight percent, ethylene glycol monobutyl ether present in about 0.0 to 15.0 weight percent, and propoxypropanol present in about 0.0 to 20.0 weight percent as discrete constituents thereof, which constituents have specific gravities less than said polydimethylsiloxane and have varying rates of evaporation such that the ratio of toluene to the acetate and alcohol solvent constituents in said solvent system decreases as the constituents of said solvent system evaporate.

Claim 13

An in-mold lacquer, coating for a polyurethane-molded article, which coating is mold-releasable without the aid of an external mold release agent and is re-coatable after de-molding without additional surface preparation, comprising a mixture of a fully-reacted aliphatic polyurethane resin present in about 3.0 to 17.0 weight percent, a polydimethylsiloxane fluid present in about 0.15 to 1.15 weight percent, and a solvent system that is incompatible with said polydimethylsiloxane, having toluene present in about 15.0 to 60.0 weight percent, ethyl acetate present in about 2.0 to 25.0 weight percent, methanol present in about 1.0 to 30.0 wight percent, isopropanol present in about 15.0 to 50.0 weight percent, ethylene glycol monobutyl ether present in about 0.0 to 15.0 weight percent, and propoxypropanol present in about 0.0 to 20.0 weight percent as discrete constituents thereof, which constituents have specific gravities less than said polydimethylsiloxane and have varying rates of evaporation such that the ratio of toluene to the acetate and alcohol solvent constituents in said solvent system decreases as the constituents of said solvent system evaporate.

Claim 14

An in-mold lacquer coating for a polyurethane-molded article, which coating is mold-releasable without the aid of an external mold release agent and is re-coatable after de-molding without additional surface preparation, comprising a mixture of a fully-reacted aliphatic polyurethane resin, a polydimethylsiloxane fluid, and a solvent system that is incompatible with said polydimethylsiloxane, having toluene, an acetate solvent, and alcohol solvents as discrete constituents thereof, which constituents have specific gravities less than said polydimethylsiloxane and have varying rates of evaporation such that the ratio of toluene to the acetate and alcohol solvent constituents in said solvent system decreases as the constituents of said solvent system evaporate.

Claim 15

An in-mold lacquer coating for a polyurethane-molded article, which coating is mold-releasable without the aid of an external mold release agent and is re-coatable after de-molding without additional surface preparation, comprising a mixture of a fully-reacted aliphatic polyurethane resin, a polydimethylsiloxane fluid, and a solvent system that is incompatible with said polydimethylsiloxane, having toluene, an acetate solvent, and alcohol solvents as discrete constituents thereof, which constituents have specific gravities less than said polydimethylsiloxane and have varying rates of evaporation such that the ratio of toluene to the acetate and alcohol solvent constituents in said solvent system decreases as the constituents of said solvent system evaporate.