Preparation of polyurethane composite mold by injection molding

Details Preparation of polyurethane composite mold by injection molding Preparation of polyurethane composite mold by injection molding

1976-05-07

1978-12-26

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Including use of vacuum

264102, 264225, 264337, 264338, 264DIG77, B29C 102, B29G 300

Patent

active

041316673

ABSTRACT:
Method of preparing polyurethane composite mold by injecting a composite reaction mixture onto a master form in a mold cavity, curing said reaction composite and removing it from the master form in a step-wise process involving a pressure manipulation. Said composite comprises 100 parts by weight inorganic water insoluble inert granular material and about 50 to about 200 parts by weight liquid polyurethane reaction mixture substantially free of volatile solvents.

REFERENCES:
patent: 1991009 (1935-02-01), Bronne et al.
patent: 3059278 (1962-10-01), Daniel
patent: 3253303 (1966-05-01), Brandt
patent: 3428725 (1969-02-01), Delmonte et al.
patent: 3504079 (1970-03-01), Hall
patent: 3546148 (1970-12-01), Diamond et al.

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