发明名称 |
Bookbinding adhesive |
摘要 |
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). |
申请公布号 |
US9487687(B2) |
申请公布日期 |
2016.11.08 |
申请号 |
US201415024798 |
申请日期 |
2014.08.07 |
申请人 |
DIC CORPORATION |
发明人 |
Ninomiya Atsushi;Minamida Yukihiko;Fujiwara Toyokuni;Nonaka Ryou |
分类号 |
C09J175/08;C09J175/04;C08G18/48;C08G18/62;C08G18/40;C08G18/42;C08G18/76 |
主分类号 |
C09J175/08 |
代理机构 |
McDermott Will & Emery LLP |
代理人 |
McDermott Will & Emery LLP |
主权项 |
1. A bookbinding adhesive,
which includes a moisture-curing polyurethane hot-melt adhesive containing an urethane prepolymer having an isocyanate group, which is obtained by reacting a polyol (A) with a polyisocyanate (B), wherein the polyol (A) contains a crystalline polyester polyol (a-1), a polyether polyol (a-2) and acrylic polyol (a-3), the total amount of the polyol (a-1) and the polyol (a-2) is 40% by mass or more based on the mass of the polyol (A), and the amount of the acrylic polyol (a-3) used is in the range of from 1 to 30% by mass based on the mass of the polyol (A), wherein the polyol (A) further contains a polycaprolactone polyol (a-4); and which has 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, exhibits 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 exhibits a JIS A hardness of 95 or less, as measured with respect to the adhesive which 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, a cured film of the adhesive having an upper yield stress of 7 MPa or less. |
地址 |
Tokyo JP |