The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1987
Filed:
Dec. 06, 1985
Applicant:
Inventors:
Assignee:
BP Chemicals Limited, London, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526159 ; 525323 ; 526142 ; 526348 ;
Abstract
The invention concerns elastomeric copolymers of ethylene and propylene wherein the proportion by weight of units derived from ethylene is from 34 to 67% and the proportion by weight of units derived from propylene is from 33 to 66%. The copolymers are characterized in that 60% at least of the units derived from propylene are disposed in sequences of at least three successive units and that their fusion enthalpy, as measured after a given heat treatment, is lower than 15 cal/g (calories per gram) and in most cases is from 5 to 10 cal/g. The copolymers of the invention can be used in particular for the production of isotactic polypropylene compositions.