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:
Jun. 23, 1992
Filed:
Apr. 26, 1990
Applicant:
Inventors:
Assignee:
Nippon Polyurethane Industry Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528 48 ; 528 58 ; 528 71 ; 528 85 ; 360134 ; 360135 ;
Abstract
A binder for a magnetic recording medium comprising a hydroxy-group-terminated polyurethane resin prepared by reaction of a polycarbonate-polyol, a chain-extender, and an organic diisocyanate; (A) said polycarbonate-polyol comprising poly(cyclohexane-1,4-dimethanol carbonate)-polyol as a constituting component in an amount of from 20 to 80% by weight, and (B) said chain-extender being a compound having a molecular weight of not more than 1,000 and having two or more amino or hydroxyl groups in the molecule.