Dic Corporation

Dainippon Ink and Chemicals, Incorporated

Yukihiko Minamida

Toyokuni Fujiwara

Toshio Niwa

Tomoaki Harada

Ryou Nonaka

Atsushi Ninomiya

Takayoshi Ito

Nobuhiko Endo

Masayoshi Imanaka

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&#xb7;s, as measured at 120&#xb0; 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&#xb0; 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&#xb0; C., and is then allowed to stand in an atmosphere at 23&#xb0; 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).

Bookbinding adhesive

A method for coating a substrate and a coating device used therein that can smoothly form an adhesive layer on the surface of a substrate without roughening, is provided which do not require a drying process and is free of various problems such as sick house syndrome stemming from use of organic solvents. In addition, a method of producing a laminated object using the coating method and the laminated object obtained thereby are provided. In the method for coating a substrate to form an adhesive layer on one surface of the substrate, while the substrate is being conveyed by applying a hot melt adhesive in a melted state via a rotating applicator roller, with the direction of rotation of the applicator roller and the direction of conveying the substrate being the same, adhesive is applied to the substrate while slipping the applicator roller by setting the circumferential speed of the applicator roller to be at least 20% slower or at least 20% faster than the predetermined speed at which the substrate is conveyed.

Method for applying adhesive to substrate, substrate, coating device, method for producing laminated object, and laminated object

A moisture-curable polyurethane hot-melt adhesive, which includes a urethane prepolymer obtained by a reaction between polyisocyanate and polyols, wherein the polyols contain: long-chain aliphatic polyester polyol (A) represented by a general formula (I); aliphatic polyether polyol (B) having a number average molecular weight of 3,000 to 15,000; and aromatic polyester polyol (CI) which has a number average molecular weight of 1,000 to 5,000 and has a glass-transition temperature of 40&#xb0; C. or more; (in the general formula (I), Rand Reach independently represent a straight chain alkylene group wherein the number of carbon atoms in the group is an even number, the sum of the number of carbon atoms in Rand Ris 12 or more, and n represents a number of 3 to 40).

Moisture-curable polyurethane hot-melt adhesive

Growing community of inventors

Osaka, Japan

Yukihiko Minamida