Plastic and nonmetallic article shaping or treating: processes – With printing or coating of workpiece – Coating or impregnating workpiece before molding or shaping...
Patent
1989-03-31
1990-09-04
Woo, Jay H.
Plastic and nonmetallic article shaping or treating: processes
With printing or coating of workpiece
Coating or impregnating workpiece before molding or shaping...
264257, B29C 6712
Patent
active
049543040
ABSTRACT:
A process for producing a prepreg and a process for producing a laminated sheet therefrom are disclosed, the process for producing a prepreg comprising impregnating a fibrous base with an impregnating resin composition essentially comprising (A.sub.1) a room temperature liquid epoxy resin, (A.sub.2) an epoxy resin curing agent, (B.sub.1) a resin containing a polymerizable unsaturated group, (B.sub.2) a room temperature liquid polymerizable vinyl monomer, and (B.sub.3) a polymerization initiator and containing no solvent other than said polymerizable vinyl monomer (B.sub.2), to obtain an impregnated base, and then removing the polymerizable vinyl monomer present in said impregnated base and converting the resin components to the B-stage. The prepreg is tack-free and soft, and the laminated sheet obtained therefrom has improved metal foil peel strength and interlaminar peel strength.
Hayashi Munekazu
Idemura Satoshi
Kunitake Yuji
Ohi Kazumi
Ohtake Toshikazu
Dainippon Ink and Chemical Inc.
Durkin II Jeremiah F.
Woo Jay H.
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