Modifier for polypropylene imparting improved melt strength

Details Modifier for polypropylene imparting improved melt strength Modifier for polypropylene imparting improved melt strength

1995-04-25

1996-04-09

Seccuro, Jr., Carman J.

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

Synthetic resins

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

525 94, C08L 2310, C08L 2316, C08L 3312

Patent

active

055063071

ABSTRACT:
Polymer melt blends of a homopolymer of propylene or a copolymer of propylene with up to 40 weight percent of another monoolefin, with a homopolymer of one or more of a C.sub.10 to C.sub.30 alkyl (meth)acrylate or a copolymer containing at least 70 weight percent of the one or more C.sub.10 to C.sub.30 ester of an alkyl (meth)acrylate with up to 30 weight percent of one or more of a C.sub.1 to C.sub.9 alkyl (meth)acrylate, the homopolymer or copolymer having a weight-average molecular weight of at least 670,000, exhibit a relative characteristic time, as herein described, at least five (5) times that for the unmodified homo- or copolymer of polypropylene, and a melt strength ratio (as judged by relative sag resistance) at least 5 times that of the unmodified homo- or copolymer of polypropylene. Such blends are useful in thermoforming operations wherein sheet is thermoformed into cartons, containers, appliance housings, and the like.

REFERENCES:
patent: 3062765 (1962-11-01), Sherman et al.
patent: 4094927 (1978-06-01), Harrop et al.
patent: 4156703 (1979-05-01), Harrop et al.
patent: 4963622 (1985-05-01), Heitz
patent: 5128410 (1992-07-01), Ilenda et al.
patent: 5247024 (1993-09-01), Natoli et al.
patent: 5352500 (1994-10-01), Memon

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