Injection molding reduced combustibility high impact strength po

Details Injection molding reduced combustibility high impact strength po Injection molding reduced combustibility high impact strength po

1977-11-10

1978-08-15

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, 260 4246, 264329, C08K 554

Patent

active

041072588

ABSTRACT:
A process is disclosed for the production of injection molded high density polyethylene articles having reduced combustibility and high impact strength comprising: maintaining a mold cavity at a preselected back pressure sufficiently high to substantially prevent foaming of a high density polyethylene material melt to be injected therein; injecting said melt into said mold cavity under pressure in excess of said back pressure to fill said mold cavity; said high density polyethylene material melt containing: (a) from about 50 to 70% by weight of alumina trihydrate, (b) from about 1 to 12% by weight of water as a processing aid, and (c) from about 0.5 to 3% by weight of a methoxy polyethylene glycol propyltrimethoxy silane having the formula:

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: 3741929 (1973-06-01), Burton
patent: 3922442 (1975-11-01), North
patent: 3936403 (1976-02-01), Sakaguchi

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