Ultraviolet curable basecoats for vacuum metallization

• US 4,481,093 A
• Filed: 09/30/1983
• Issued: 11/06/1984
• Est. Priority Date: 10/13/1981
• Status: Expired due to Fees

• Current Assignee: DSM Resins BV (DSM-Firmenich AG), Stamicarbon B.V. (MAIRE)
• Original Assignee: DeSoto, Inc. (Overstock.com Incorporated)
• Inventors: Lewarchik, Ronald J., Murphy, Edward J., Thompson, Jeffrey W.
• Primary Examiner(s): Morris, Theodore
• Application Number:
  US06/537,695
• Time in Patent Office: 403 Days
• Field of Search: 204/159.14, 204/159.19, 525/920
• US Class Current: 522/79
• CPC Class Codes: C08F 220/00 Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
• CPC Class Codes: C08F 299/065 from polyurethanes with side or terminal unsaturations
• CPC Class Codes: C08J 7/18 using wave energy or particle radiation
• CPC Class Codes: C09D 4/00 Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
• CPC Class Codes: Y10S 525/92 Polyurethane having terminal ethylenic unsaturation

Abstract

An ultraviolet light-curable liquid coating composition for molded plastic objects is disclosed. The composition is a liquid mixture of a polyurethane oligomer polyacrylate and an hydroxy-functional polyacrylate ester. The polyacrylate ester is present in an amount of from more than 50% up to 70% of total polyacrylate, and the composition is in solution in alcoholic solvent providing a solids content of from 65% to 90%. A photoinitiator is included to render the composition curable upon exposure to ultraviolet light.

Claims

1. An ultraviolet light-curable liquid coating composition for molded plastic objects comprising an alcoholic solvent solution of:

(1) a polyurethane oligomer polyacrylate which is a derivative of an organic solvent-soluble hydroxy functional polyester having an average molecular weight of 500-1500 and an average of at least about 2.0 hydroxy groups per molecule, each hydroxy group carrying an acrylate ester group by a plurality of urethane linkages; and

(2) an hydroxy-functional polyacrylate which is constituted by an organic polyol having a molecular weight below 500 and at least about 3 hydroxy groups per molecule, said polyol being esterified to contain at least about 1.5 acrylate ester groups per molecule and having at least about 0.5 unreacted hydroxy groups per molecule;

said polyacrylate ester being present in an amount of from more than 50% up to 70% of total polyacrylate, and said solution having a solids content of from 65% to 90%, said solution further including a photoinitiator to render the composition curable on exposure to ultraviolet light.