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:
Apr. 21, 1998
Filed:
Feb. 03, 1997
Applicant:
Inventors:
Anil Kumar Saxena, Midland, MI (US);
Toshio Suzuki, Midland, MI (US);
Assignee:
Dow Corning Corporation, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
525106 ; 525479 ; 528 37 ;
Abstract
The present invention relates to a method for preparing a polyisobutylene-siloxane block copolymer, said method comprising: (I) lithiating (A) a polyisobutylene having one or two terminal silanol groups with (B) an organolithium compound; (II) reacting the silanolate-functional polyisobutylene obtained in step (I) with (C) a hexaorganocyclotrisiloxane; and (III) capping the siloxanotate-functional block copolymer obtained in step (II) with a compound selected from (D) a silane having at least one hydrolyzable group or (E) an acid.