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:
Nov. 08, 2016
Filed:
Aug. 07, 2014
Dic Corporation, Tokyo, JP;
Atsushi Ninomiya, Osaka, JP;
Yukihiko Minamida, Osaka, JP;
Toyokuni Fujiwara, Osaka, JP;
Ryou Nonaka, Osaka, JP;
DIC CORPORATION, Tokyo, JP;
Abstract
An object to be achieved by the present invention is to provide a bookbinding adhesive which is excellent in high-speed application properties, cutting properties, book opening properties, and bookbinding strength. The present invention is directed to a bookbinding adhesive characterized by having a melt viscosity in the range of from 1,000 to 10,000 mPa·s, as measured at 120° C. by means of a cone plate viscometer, exhibiting a JIS A hardness of 20 or more, as measured with respect to the adhesive which is applied and allowed to stand for 30 minutes, in an atmosphere at 23° C., and exhibiting a JIS A hardness of 95 or less, as measured with respect to the adhesive which is applied and allowed to stand for 30 minutes, in an atmosphere at 23° C., and is then allowed to stand in an atmosphere at 23° C. and at a humidity of 50% for one week, wherein a cured film of the adhesive has an upper yield stress of 7 MPa or less. The bookbinding adhesive is preferably a moisture-curing polyurethane hot-melt adhesive containing an urethane prepolymer having an isocyanate group which is obtained by reacting a polyol (A), which contains a crystalline polyester polyol (a-1) and a polyether polyol (a-2), with a polyisocyanate (B).