公开(公告)号：US3578726A

公开(公告)日：1971-05-11

申请号：US3578726D

申请日：1969-10-13

Applicant: GEN ELECTRIC

Inventor： BOSTICK EDGAR E ,  FESSLER WILLIAM A

IPC: C08L83/00 ,  C08G77/00 ,  C08G77/42 ,  C08G77/44 ,  C08L83/04 ,  C08G31/34 ,  C08G47/02

CPC classification number: C08G77/44

Abstract: A CONDENSATION METHOD IS PROVIDED FOR MAKING BRANCHED AND MULTIPLE SEQUENCE BLOCK POLYMERS. A SILANE HAVING AT LEAST TWO HYDROLYZABLE RADICALS ATTACHED TO SILICON IS EMPLOYED TO COUPLE ACTIVE POLYDIORGANOSILOXANE HAVING AT LEAST ONE TERMINAL ALKALI METAL SILANOLATE RADICAL. THE POLYDIORGANOSILOXANE CAN BE IN THE FORM OF A BINARY OR TERNARY BLOCK AND THE ALKALI METAL SILANOLATE IS COMPLEXED WITH HEXAMETHYLPHOSPHORAMIDE TO PROVIDE A STABLE NON-RANDOMIZING ACTIVATED SITE. THE MULTIPLE SEQUENCE BLOCK POLYMERS EXHIBIT IMPROVED PHYSICAL PROPERTIES OVER THE CORRESPONDING BINARY OR TERNARY BLOCK POLYMERS.