Process for injection molding

Details Process for injection molding Process for injection molding

1990-12-11

1992-09-22

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

26433117, 524108, B29C 4500

Patent

active

051494841

ABSTRACT:
A process for preparing a low haze molded article includes adding a nucleating agent to a polypropylene homopolymer or copolymer to form prenucleated polypropylene having a molecular weight of at least about 20,000 and an isotactic index of at least about 60 percent, and forming a molding composition by mixing the prenucleated polypropylene with linear low density polyethylene having a melt index of at least about 120 grams per 10 minutes, in an amount of about 1 to 5 percent by weight based on the total weight of the polyethylene and the polypropylene. This mixture is then introduced into an injection molding zone where it is molded at a temperature below the melting point of the polypropylene.

REFERENCES:
patent: 4000229 (1976-12-01), Wainer
patent: 4294794 (1981-10-01), Lovell et al.
patent: 4386188 (1983-05-01), Grancio et al.
patent: 4585817 (1986-04-01), Su et al.
patent: 5082902 (1992-01-01), Gurevitch et al.

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