US 12,215,182 B2
Urethane prepolymer, adhesive, skin patch material, adhesive tape, wearable device, and wearable device kit
Makito Nakamura, Tokyo (JP); Haru Kawasaki, Tokyo (JP); Hitoshi Shimoma, Tokyo (JP); Chitoshi Suzuki, Tokyo (JP); and Hiroshi Wada, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Aug. 11, 2021, as Appl. No. 17/399,512.
Application 17/399,512 is a continuation of application No. PCT/JP2020/006116, filed on Feb. 17, 2020.
Claims priority of application No. 2019-036306 (JP), filed on Feb. 28, 2019.
Prior Publication US 2021/0371574 A1, Dec. 2, 2021
Int. Cl. C09J 175/08 (2006.01); A61B 5/00 (2006.01); C08G 18/12 (2006.01); C08G 18/48 (2006.01); C09J 7/38 (2018.01)
CPC C08G 18/12 (2013.01) [A61B 5/6833 (2013.01); C08G 18/4833 (2013.01); C09J 7/38 (2018.01); C09J 175/08 (2013.01); C08G 2170/40 (2013.01)] 23 Claims
 
1. A pressure-sensitive adhesive, obtained by a process comprising:
reacting an oxyalkylene polymer A having an average number of hydroxy groups per molecule of from 2.1 to 3, an oxyalkylene polymer B having one hydroxy group per molecule, and a polyisocyanate compound, wherein
the pressure-sensitive adhesive has a difference between adhesion to a phenol resin and adhesion to human skin of at least 2 N/15 mm,
the oxyalkylene polymer B has a number average molecular weight of at least 5,000,
the oxyalkylene polymer B has a molecular weight distribution Mw/Mn of less than 1.20 where Mw is a mass average molecular weight and Mn is a number average molecular weight,
the oxyalkylene polymer B has a degree of unsaturation of at most 0.015 meq/g, and
the pressure-sensitive adhesive has a content of ethylene oxide units of at least 10 mass %.