In-mold primer coating for thermoplastic substrates
AssigneeOMNOVA Solutions Inc.
InventorDouglas S. McBain
Life of this patent
Estimating the term…
Abstract
An in-mold primer coating adapted to be applied in-mold to a thermoplastic substrate and heat cured to form a thermoset surface coating on the molded substrate. The in-mold primer coating comprises a coreactive polymerizable composition comprising an epoxy-acrylate oligomer having a molecular weight from about 350 to about 2500, a hydroxyl functional acrylate or methacrylate, a vinyl aromatic monomer such as styrene, and a small amount of acrylic or methacrylic acid, with the balance being other diacrylate and/or other ethylenically unsaturated monomer(s), if any.
Claims33
An in-mold primer coating for in-mold coating a molded thermoplastic substrate, the in-mold primer coating comprising;
- a coreactive polymerizable composition including:
- 100 parts by weight of an epoxy-acrylate oligomer having a number average-molecular weight from about 360 to about 2500;
- from about 30 to about 70 parts by weight of an hydroxyl alkyl acrylate or methacrylate;
- from about 30 to about 80 parts by weight of a vinyl aromatic monomer;
- and
- from about 2 to about 20 parts by weight of an acrylic acid monomer, and,
- wherein said parts by weight are based upon 100 parts by weight of said epoxy-acrylate oligomer.
An in-mold coating for in-mold coating a molded thermoplastic substrate, the in-mold coating comprising by weight a coreactive polymerizable composition of:
- from about 25% to about 65% of a low molecular weight epoxy-acrylate oligomer having a number average molecular weight from about 360 to about 2500;
- from about 15% to about 40% of an hydroxy alkyl acrylate and/or methacrylate;
- from about 10% to about 35% of a vinyl aromatic monomer;
- and
- from about 1% to about 10% of an acrylic acid monomer selected from acrylic acid and/or methacrylic acid.
A molded thermoplastic laminate, comprising:
- a thermoplastic substrate coated with a cured in-mold primer coating, said primer coating comprising:
- about 100 parts by weight of a low molecular weight epoxy acrylate having a number average molecular weight from about 360 to about 2500;
- from about 30 to about 70 parts by weight of an hydroxyl acrylate or methacrylate;
- from about 30 to about 80 parts by weight of a vinyl aromatic monomer;
- and
- from about 2 to about 20 parts by weight of acrylic acid or methacrylic acid,
- said parts by weight are based upon 100 parts by weight of said epoxy-acrylate oligomer.
An in-mold coating process, comprising the steps of:
- injection molding a thermoplastic substrate,
- applying a primer coating on said thermoplastic substrate, said primer coating comprising:
- about 100 weight parts of an epoxy-acrylate oligomer having a molecular weight from about 360 to about 2500;
- from about 30 to about 70 weight parts of an hydroxyl alkyl acrylate or methacrylate;
- from about 30 to about 80 weight parts of a vinyl aromatic monomer;
- from about 2 to about 20 weight parts of acrylic acid or methacrylic acid;
- wherein said parts by weight are based upon 100 parts by weight of said epoxy-acrylate oligomer;
- and
- polymerizing the in-mold coating to form a thermoset primer coated thermoplastic substrate.
Dependencies are inferred from the claim text.