Thermoplastic polymer compositions and their production and use

Details Thermoplastic polymer compositions and their production and use Thermoplastic polymer compositions and their production and use

1994-12-16

1998-05-05

Cain, Edward J.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

525192, 525232, C08L 900

Patent

active

057475920

ABSTRACT:
A thermoplastic polymer composition incorporating at least about 50 wt % polypropylene, at least about 20 wt % of an elastomer such as EP rubber and at least about 4 wt % plastomer. The plastomer is preferably a single site catalyzed ethylene based copolymer having a density less than about 0.915. By adjusting the amount of the plastomer in the composition, considerable control is secured over post-mold shrinkage of components produced through injection molding operations utilizing the composition. The composition can be prepared as a reactor blend or a melt blend. The composition is particularly useful in producing large components such as bumpers and exterior trim fascia for automobiles.

REFERENCES:
patent: 5023300 (1991-06-01), Huff et al.
patent: 5086121 (1992-02-01), Hazelton et al.
patent: 5210139 (1993-05-01), Huff et al.
"The Three Principal Development Axes of Polypropylene for Injection Moulding Applications" presented at the Polypropylene '93 Conference, Oct. 26-27, 1993, Zurich Switzerland.
"Impact Modifiers Get Tough With Cost-Performance", Plastics World, Mar. 1994, pp. 51-53.

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