Process for injection molding thermoplastic articles with reduce

Details Process for injection molding thermoplastic articles with reduce Process for injection molding thermoplastic articles with reduce

1977-11-10

1980-01-22

Michl, Paul R.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

260 296XA, 260 296WQ, B28B 124

Patent

active

041850700

ABSTRACT:
A process is disclosed for the production of injection molded thermoplastic articles having reduced combustibility comprising: maintaining a mold cavity at a pre-selected back pressure sufficiently high to substantially prevent foaming of a thermoplastic melt to be injected therein; injecting thermoplastic melt into said mold cavity under a pressure in excess of said back pressure to fill said mold cavity; said thermoplastic melt containing from about 50 to 70% by weight of alumina trihydrate and from about 1 to 12% by weight of water as a liquid processing aid.

REFERENCES:
patent: 2402805 (1946-06-01), Cousino
patent: 2487426 (1949-11-01), Cousino
patent: 3066356 (1962-12-01), Porter
patent: 3299186 (1967-01-01), Wallace
patent: 3563939 (1971-02-01), Stevens
patent: 3719441 (1973-03-01), Spaak
patent: 3741929 (1973-06-01), Burton
patent: 3826775 (1974-07-01), Sobolev
patent: 3847865 (1974-11-01), Duggins
patent: 3922442 (1975-11-01), North
patent: 3936403 (1976-02-01), Sakaguchi
patent: 3957723 (1976-05-01), Lawson

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