Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Composite article making
Patent
1972-07-24
1976-02-24
Cockeram, H. S.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Composite article making
156315, 156332, 260 25BE, 260 18TN, 428425, 428480, B29D 2700, B32B 2740, C08G 1814
Patent
active
039404684
ABSTRACT:
A polyurethane pre-foam formulation having improved adhesion to polyester resins is disclosed. The polyurethane is of the type formed by the reaction of an isocyanate and a polyol together with a blowing agent. The improved formulation contains a polyester resin between about 1 and 10% by weight of the polyurethane together with a sufficient amount of a free radical catalyst to bring about a cure of the added polyester resin. Preferably, the improved polyurethane prefoam is foamed and cross-linked in contact with a partially uncured but gelled unsaturated polyester laminating resin which contains an unsaturated monomer such as styrene. When such a polyester and a polyurethane foam are cured together, a superior bond between them results when the polyurethane formulation is compounded in accordance with the teachings of the present invention.
REFERENCES:
patent: 2740743 (1956-04-01), Pace
patent: 3383351 (1968-05-01), Stamberger
patent: 3523093 (1970-08-01), Stamberger
patent: 3644569 (1972-02-01), Pietsch et al.
patent: 3738895 (1973-06-01), Paymal
patent: 3823099 (1974-07-01), Doyle
Cockeram H. S.
Fibre-Thane Homes, Inc.
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