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CA1199746A Expired / Lapsed CA ⏱️ 0.0 years remaining

Polypropylene compositions with improved impact strength

Assignee: BP Chimie SA
•
Filing: 1981-11-12
•
Granted: 1986-01-21
•
Expires: 2001-11-12
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Abstract

Abstract Abstract of the Disclosure The invention concerns polypropylene compositions with improved impact strength characterised in that they contain: a) 40 to 98% by weight of isotactic polypropylene b) 2 to 60% by weight of a copolymer of linear low density polyethylene type with a density of up to 0.935, obtained by copolymerising a mixture of ethylene and one or more upper alpha-olefins, by a copolymerising process at a pressure below 4-106 Pa, in the absence of any liquid hydrocarbons. The polypropylene compositions are particularly adapted for conversion to finished articles by extrusion drawing, extrusion blow-moulding or thermoforming.

Inventors

  • 👤 Jean P. Thiersault
  • 👤 Alain Senez
  • 👤 Jean C. Roustant

Bibliographic Details

Application Number —
Jurisdiction CA
Data Source google_patents
Last Synchronized 2026-11-02 12:16
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L23/10; C08L23/12

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 86 words
Polypropylene compositions with improved impact strength, characterised in that they contain: a) 40 to 98% by weight of isotactic polypropylene b) 2 to 60% by weight of a linear low density polyethylene, of a density equal to or higher than 0.920 and lower than 0.935, obtained by copolymerising 85 to 96% by weight of ethylene with 4 to 15% by weight of one or more upper alpha-olefins by a process of copolymerisation at a pressure below 4X106 Pa and in the absence of any liquid hydrocarbons.
Claim 2
Dependent Claim 86 words
Polypropylene compositions with improved impact strength, characterised in that they contain: a) 40 to 98% by weight of isotactic polypropylene b) 2 to 60% by weight of a linear low density polyethylene, of a density equal to or higher than 0.920 and lower than 0.935, obtained by copolymerising 85 to 96% by weight of ethylene with 4 to 15% by weight of one or more upper alpha-olefins by a process of copolymerisation at a pressure below 4X106 Pa and in the absence of any liquid hydrocarbons.
Claim 3
Dependent Claim 30 words
The compositions of claim 1, wherein the linear low density polyethylene is prepared from a mixture of ethylene and one or more upper alphaolefins containing 3 to 8 carbon atoms.
Claim 4
Dependent Claim 33 words
The compositions of claim 1, wherein the linear low density polyethylene is prepared from a mixture of ethylene and one or more upper alphaolefins selected from propylene, l-n-butene, l-n-hexene, 4-methyl-1-pentene or l-n octene.
Claim 5
Dependent Claim 17 words
A method of preparing the compositions of claim 1, comprising mixing the constituents in the molten state.
Claim 6
Dependent Claim 40 words
The method of claim 4, wherein the mixture in the molten state is made from the mixture of powders or granules of the constituents, directly in the machines for converting it to finished articles, such as extruders or injection presses.
Claim 7
Dependent Claim 20 words
Application of the compositions of claim 1 to the manufacture of finished articles by extrusion drawing, extrusion blow-moulding or thermo-forming.

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