Ultraviolet radiation curable vehicle for ceramic colors, composition and method

  • US 4,649,062 A
  • Filed: 04/25/1985
  • Issued: 03/10/1987
  • Est. Priority Date: 01/05/1983
  • Status: Expired due to Fees
First Claim
Patent Images

1. An ultraviolet radiation curable vehicle for ceramic frits, said vehicle comprising(a) not less than three polymerizable liquid oligomers, each containing acrylate or methacrylate functional end groups and selected from(i) a difunctional- or trifunctional-polyester acrylate or methacrylate, a difunctional- or trifunctional-polyether acrylate or methacrylate, a difunctional- or trifunctional-polyester-polyether acrylate or methacrylate, a difunctional- or trifunctional-polyurethane acrylate or methacrylate or a mixture of any of the foregoing;

  • (ii) an at least tetrafunctional polyester-polyether acrylate or methacrylate; and

    (iii) an epoxidized unsaturated fatty acid triglyceride acrylate or methacrylate;

    the amount of (ii) being at least sufficient to increase solvent resistance of the cured vehicle and the amount of (iii) being at least sufficient to enhance the adhesion thereof to a substrate;

    (b) not less than three polymerizable liquid monomers, each containing acrylic or methacrylic functional groups and selected from(i) a monofunctional polyether acrylate or methacrylate;

    (ii) at least one difunctional polyglycol acrylate or methacrylate; and

    (iii) at least one trifunctional aliphatic triacrylate or trimethacrylate;

    the ratios of (i), (ii) and (iii) being selected to provide an acrylate or methacrylate functionality of not less than 1 nor more than 3;

    (c) an effective amount of a photoinitiator combination comprising(i) a 2-phenyl acetophenone compound;

    (ii) a substituted thioxanthone compound; and

    (iii) an ester of an aminobenzoic acid, or a tertiary amine, the ratios of (i), (ii) and (iii) being selected to provide a balance of surface cure and through cure on ultraviolet exposure of films comprising said vehicle; and

    (d) an amount of a polymerization inhibitor which is at least effective to retard polymerization of the vehicle in total darkness, but less than an amount which will significantly retard the rate of cure of said vehicle when exposed to ultraviolet light.

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