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:
May. 12, 1998
Filed:
Jun. 04, 1996
Applicant:
Inventors:
Yasuyoshi Komoto, Kanagawa-ken, JP;
Yasuyuki Takiguchi, Kanagawa-ken, JP;
Ken Yahata, Kanagawa-ken, JP;
Akira Hayashida, Kanagawa-ken, JP;
Minoru Takamizawa, Kanagawa-ken, JP;
Assignee:
Shin-Etsu Chemical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
C08G / ; C08G / ;
U.S. Cl.
CPC ...
528310 ; 528126 ; 528170 ; 528322 ; 528332 ; 528353 ; 525419 ; 525420 ;
Abstract
This invention provides a process wherein a stable solution of polycarbodiimide with a number-average molecular-weight of 5,000 to 60,000 can be very easily prepared by using an organic diisocyanate (e.g., 2,4-tolylene diisocyanate or 2,6-tolylene diisocyanate) as starting material, a cyclic phosphine oxide as catalyst and a chlorinated aromatic compound as solvent and by controlling certain reaction conditions within the reaction temperature range of 110.degree. to 150.degree. C.