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:
Nov. 17, 1981
Filed:
Mar. 18, 1975
James L Jezl, Swarthmore, PA (US);
Standard Oil Company (Indiana), Chicago, IL (US);
Abstract
Substantially crystalline block polymers comprising a homo-polymer block of an alpha-olefin having 2-8 carbon atoms and attached thereto a copolymer block of at least 2 alpha-olefins containing 2-2 carbon atoms, one of which may be the same or different from the alpha-olefin from which the homo-polymer block is prepared. Such block polymers are prepared in the presence of a stereospecific catalyst system by contacting the aforesaid alpha-olefin with said catalyst system to form the solid, substantially crystalline homo-polymer block, and then contacting the same catalyst system with the aforesaid mixture of said alpha-olefins. In an embodiment between about 55 and 95% of the polymerization time is expended in preparing the homo-polymer block. When preparing the copolymer block, one uses at least as much of the least reactive alpha-olefin, or more of the same, as one uses of the more reactive monomers.