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:
Jan. 13, 1976
Filed:
Aug. 29, 1973
Applicant:
Inventors:
Yasuo Fujimoto, Yokohama, JA;
Keizo Tatsukawa, Machida, JA;
Masayuki Teranishi, Machida, JA;
Shinsuke Koshimoto, Machida, JA;
Toru Doiuchi, Dusseldorf, DT;
Assignee:
Kyowa Hakko Kogyo Co., Ltd., , JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B32B / ; C08G / ; C08G / ;
U.S. Cl.
CPC ...
260 / ; 260 / ; 260858 ; 428423 ; 428425 ; 428901 ;
Abstract
Amino acid-urethane copolymers improved in elongation, tensile strength and flexing endurance are prepared by polymerizing a prepolymer having terminal isocyanate groups, obtained by reacting a polyether polyol having hydroxyl groups substantially at the terminals thereof with an organic polyisocyanate in a ratio in equivalent of the organic polyisocyanate to the polyether polyol of 1.6 to 2.5, either with an amino acid-N-carboxylic acid anhydride or with a polyamino acid polymer obtained by polymerizing an amino acid-N-carboxylic acid anhydride.