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:
Jan. 10, 1989
Filed:
Apr. 14, 1987
Marie-Line Aubanel, Saint Mitre-les-Ramparts, FR;
Jean C Bailly, Martigues, FR;
BP Chemicals Limited, London, GB;
Abstract
The invention relates to amorphous copolymers of ethylene and one or more alpha-olefins comprising from 3 to 12 carbon atoms, possessing a high molecular weight, a crystallinity index less than or equal to 1.0%, a content of units derived from ethylene comprised between 40 and 60 moles %, a content of units derived from propylene and/or 1-butene between 60 and 40 moles % and a content of units derived from alpha-olefins comprising 5 to 12 carbon atoms of less than or equal to 10 moles %. These copolymers of a practically completely amorphous character advantageously occur in the form of a powder which is easy to handle. They are obtained by copolymerization in the gas phase by means of a catalyst system of the Ziegler-Natta type, very stereospecific to the polymerization of propylene.