	US 7,612,151 B2
	Moisture-curable polyurethane hot-melt adhesive
Yukihiko Minamida, Osaka (Japan); Masayoshi Imanaka, Osaka (Japan); and Toshio Niwa, Osaka (Japan)
Assigned to Dainippon Ink and Chemicals, Inc., Tokyo (Japan)
Appl. No. 10/599,705 PCT Filed Apr. 07, 2005, PCT No. PCT/JP2005/006864 § 371(c)(1), (2), (4) Date Oct. 05, 2006, PCT Pub. No. WO2005/097933, PCT Pub. Date Oct. 20, 2005.
Claims priority of application No. 2004-115332 (JP), filed on Apr. 09, 2004.
Prior Publication US 2007/0232764 A1, Oct. 04, 2007
Int. Cl. C08G 18/10 (2006.01); C08G 18/42 (2006.01); C08G 18/48 (2006.01); C09J 175/04 (2006.01)

U.S. Cl. 525—453 [524/589; 524/590; 525/452; 525/403]

10 Claims

1. A moisture-curable polyurethane hot-melt adhesive, which comprises urethane prepolymer obtained by a reaction between polyisocyanate and polyols, wherein the polyols comprise:

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; 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° C. or more, and aromatic polyester polyol (CII) which has a number average molecular weight of 400 to 3,500, a glass-transition temperature of 20° C. or less, wherein said aromatic polyester polyol (CII) is obtained by a reaction between a polyol having a low molecular weight and a side chain(s), and o-phthalic acid,

wherein R¹and R²each independently represents 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 R¹and R²is 12 or more, and n represents a number of 3 to 40.