Dic Corporation

Ryou Nonaka

Toyokuni Fujiwara

Yoshinori Kanagawa

Yukihiko Minamida

Atsushi Ninomiya

It is an object of the present invention to provide a moisture-curable polyurethane hot-melt resin composition having excellent waterproof properties, drop impact resistance, and flexibility. The present invention provides a moisture-curable polyurethane hot-melt resin composition containing a urethane prepolymer having an isocyanate group, the urethane prepolymer being produced through a reaction of a polyol (A) with a polyisocyanate (B), wherein the polyol (A) contains a polyether polyol (A-1), a crystalline polyester polyol (A-2), an amorphous polyester polyol (A-3), and an acrylic polyol (A-4). The present invention also provides an adhesive containing such a composition and an article in which such a composition is used.

Moisture-curable polyurethane hot-melt resin composition, adhesive, and article

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

An object of the present invention is to provide a moisture-curable polyurethane hot-melt resin composition with superior properties such as water resistance, fast-curing properties, and flexibility. The present invention provides a moisture-curable polyurethane hot-melt resin composition containing an isocyanate-containing urethane prepolymer (i) that is a reaction product of polyols (A) including a polyether polyol (A-1), a crystalline polyester polyol (A-2), an amorphous polyester polyol (A-3), and an acrylic polyol (A-4) with a polyisocyanate (B); and a curing catalyst (ii) represented by general formula (1) below, and also provides an adhesive and article produced using the resin composition. The adhesive produced using the moisture-curable polyurethane hot-melt resin composition according to the present invention is suitable not only for the bonding of fibers and the lamination of construction materials, but also for the lamination of optical elements.

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Osaka, Japan

Ryou Nonaka