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EP0134427A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

A composition comprising ethylene-based polymers

Assignee: Idemitsu Petrochemical Co Ltd
•
Filing: 1984-06-08
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Granted: —
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Expires: 2004-06-08
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Abstract

Abstract The invention provides a novel resin composition of polymers of ethylene capable of giving a shaped article having outstandingly excellent mechanical properties but yet having very good processability or moldability. The resin composition is composed of 15-90% by weight of a homopolymer of ethylene and 85-10% by weight of a copolymer of ethylene and characterized by several parameters including the intrinsic viscosity, density and swelling ratio as well as satisfaction of the relationships between the melt index and the instrinsic viscosity and between the melt index and the melt tension expressed by the respective logarithmic equations. Industrially feasible processes for the preparation of such resin compositions are described in detail.

Inventors

  • 👤 Kenji Tanaka
  • 👤 Akinobu Sugawara
  • 👤 Takashi Yamawaki

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-06 19:56
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08F; C08F210/00; C08F210/16; C08L23/06; C08L2308/00

Claims Analysis

Total Claims: 4
Claim 1
Independent Claim 101 words
A composition of polymers of ethylene comprising from 15 to 90% by weight of a homopolymer of ethylene and from 85 to 10% by weight of a copolymer of ethylene, having an intrinsic viscosity in the range from 2.0 to 5.2 dl/g, a density in the range from 0.938 to 0.970 g/cm 3 and a swelling ratio of at least 1.30 and satisfying the relationships expressed by the equations log MI >0.81 - 0.69 [η] and log MT >1 - 0.33 log MI, in which MI is a melt index, [n] is an intrinsic viscosity and MT is a melt tension.
Claim 2
Dependent Claim 101 words
A composition of polymers of ethylene comprising from 15 to 90% by weight of a homopolymer of ethylene and from 85 to 10% by weight of a copolymer of ethylene, having an intrinsic viscosity in the range from 2.0 to 5.2 dl/g, a density in the range from 0.938 to 0.970 g/cm 3 and a swelling ratio of at least 1.30 and satisfying the relationships expressed by the equations log MI >0.81 - 0.69 [η] and log MT >1 - 0.33 log MI, in which MI is a melt index, [n] is an intrinsic viscosity and MT is a melt tension.
Claim 3
Dependent Claim 30 words
The composition as claimed in claim 1 wherein the copolymer of ethylene is a copolymer of ethylene and an a-olefin having from 3 to 10 carbon atoms in a molecule.
Claim 4
Dependent Claim 57 words
The composition as claimed in claim 1 wherein the homopolymer of ethylene is a combination of a first polyethylene having an intrinsic viscosity in the range from 12 to 25 dl/g and a second polyethylene having an intrinsic viscosity in the range 0.2 to 1.5 dl/g in a weight ratio in the range from 1:1 to 1:10.

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