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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.:

US 4914163 B1

PDFFull Text
Date of Patent:
Apr. 03, 1990

Filed:

Dec. 27, 1988

Process for preparing heterocyclic copolymers

Applicant:
Inventors:

Kazuyuki Sakota, Saitama, JP;

Wataru Minoshima, Saitama, JP;

Takayuki Masuda, Saitama, JP;

Chihiro Imai, Kanagawa, JP;

Tetsuro Nakahama, Hiroshima, JP;

Toshimitsu Sugawara, Hiroshima, JP;

Yoshio Nakagawa, Hiroshima, JP;

Assignees:

Tonen Sekiyu Kagaku Kabushiki Kaisha, Tokyo, JP;

Nitto Chemical Industry Co., Ltd., Tokyo, JP;

Attorney:

Wenderoth, Lind & Ponack

Primary Examiner:

Maurice J Welsh

Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
525452 ; 528 52 ; 528 67 ;
Abstract

According to the present invention, heterocyclic copolymers comprising recurring units [A] and [B] having specific structures are obtained by hydrolyzing reaction products of diisocyanate compounds having specific structures with tolidine diisocyanate and hydrogen cyanide. The heterocyclic copolymers thus obtained are excellent in mechanical strength, heat resistance and solvent resistance.

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Sakota, Kazuyuki. (1990). Process for preparing heterocyclic copolymers (U.S. Patent No. 4914163). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4914163

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