Large void-free polyethylene castings

Details Large void-free polyethylene castings Large void-free polyethylene castings

1976-01-16

1978-09-19

Seccuro, Carman J.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

264126, 264331, 260897A, 260 4246, C08L 2306

Patent

active

041154991

ABSTRACT:
Large void-free castings of polyethylene can be made by blending high density polyethylene pellets with low density polyethylene powder, followed by heating to above the melting point of the low density polyethylene and below, or only slightly above, the melting point of the high density polyethylene. Flame proofing additives, crosslinking agents and other materials can be readily incorporated into the blend before fusing. The mixture of high density and low density polyethylene significantly reduces the amount of shrinkage which takes place during the cooling from the melting temperature to ambient temperature. The low density polyethylene should have a sufficiently low melt viscosity so that it will flow under small pressures above the melting temperature.

REFERENCES:
patent: RE28594 (1975-10-01), Ronzoni et al.
patent: 2919474 (1960-01-01), Cole
patent: 3194850 (1965-07-01), Sweeney
patent: 3231636 (1966-01-01), Snyder et al.
patent: 3474051 (1969-10-01), Chappelar et al.
patent: 3478132 (1969-11-01), Randolph
patent: 3511742 (1970-05-01), Rasmussen
patent: 3592881 (1971-07-01), Ostapchenko

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