Propylene-ethylene random copolymer film

Details Propylene-ethylene random copolymer film Propylene-ethylene random copolymer film

Filed on

1996-09-03

Date issued

2000-05-02

Examiner

Teskin, Fred

Patent Class

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

SubClass

Synthetic resins

SubSubClass

Polymers from only ethylenic monomers or processes of...

Other Related Categories

5261243, 5261253, C08F21006, C08F 4649

Type

Patent

Status

active

Patent number

060574135

Description

ABSTRACT:
A propylene-ethylene random copolymer prepared by copolymerizing propylene with ethylene in the substantial absence of a liquid medium with a catalyst system comprising:
(A) a solid catalyst component containing magnesium, titanium, a halogen and a first electron donor as an essential component,
(B) an organoaluminum compound and
(C) a second electron donor compound, wherein an ethylene content (E) of the copolymer is from 3.5 to 7.0% by weight, and wherein a content of a xylene-soluble portion at 20.degree. C. (D) of the copolymer satisfies the relationship D.ltoreq.E+2.0 (% by weight). Films of the copolymer have an excellent appearance (little bleed whitening) and an excellent balance between low-temperature heat-sealing property and rigidity.

REFERENCES:
patent: 5023223 (1991-06-01), Ebara et al.
patent: 5143880 (1992-09-01), Sasaki et al.
patent: 5438110 (1995-08-01), Ishimaru et al.
patent: 5608018 (1997-03-01), Ebara et al.
patent: 5618895 (1997-04-01), Kerth et al.

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