Polyolefin/filler composite materials and their preparation and

Details Polyolefin/filler composite materials and their preparation and Polyolefin/filler composite materials and their preparation and

1991-07-24

1992-10-27

Theisen, Mary Lynn

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

264112, 264259, 264DIG6, 523218, 523219, C08J 932

Patent

active

051587270

ABSTRACT:
An insulating composition comprises a polyolefin, preferably polypropylene, and hollow microspheres, at least some of which have been pre-treated with a chain-scission agent and, optionally, a functionalizing agent for the polyolefin, before addition to the polyolefin melt. The provision of the chain-scission on the microspheres enables the microspheres to be compounded substantially without breakage with low Melt Flow Index polyolefins, with the result that the resultant composite material can be employed in rigorous application areas, for examples as an extruded flowline insulation.

REFERENCES:
patent: 4508856 (1985-04-01), Smith et al.
patent: 4608403 (1986-08-01), Sellstrom
patent: 4618525 (1986-10-01), Chamberlain et al.
patent: 4692480 (1987-09-01), Takahashi et al.
patent: 4788230 (1988-11-01), Mudge
patent: 4900488 (1990-02-01), Collins et al.
patent: 5032627 (1991-07-01), Wilson et al.

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