US 11,987,933 B2
Papermaking device and method for producing papermaking device
Yuya Takamori, Tokyo (JP); and Manami Morinaga, Tokyo (JP)
Assigned to ICHIKAWA CO., LTD., Tokyo (JP)
Filed by ICHIKAWA CO., LTD., Tokyo (JP)
Filed on Jul. 27, 2022, as Appl. No. 17/815,431.
Claims priority of application No. 2021-126322 (JP), filed on Jul. 30, 2021.
Prior Publication US 2023/0051917 A1, Feb. 16, 2023
Int. Cl. D21F 3/02 (2006.01); C08G 18/10 (2006.01); C08G 18/32 (2006.01); D21F 7/08 (2006.01)
CPC D21F 3/0236 (2013.01) [C08G 18/3221 (2013.01); D21F 7/083 (2013.01); C08G 18/10 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A papermaking device configured for use in a papermaking machine, the device comprising:
a resin layer comprising a polyurethane resin,
wherein the polyurethane resin is obtained by reacting a urethane prepolymer comprising an isocyanate group with a curing agent comprising an active hydrogen group,
wherein the urethane prepolymer is obtained by reacting a polyisocyanate compound comprising 2,4-tolylene-diisocyanate and/or 2,6-tolylene-diisocyanate with a polyol compound comprising a polyether polycarbonate diol, and
wherein the polyether polycarbonate diol comprises a unit A of formula (1)

OG Complex Work Unit Chemistry
R1 being a bivalent group derived from a polyether polyol, and
wherein the polyether polycarbonate diol is used as a polyol compound together with the 2,4-tolylene-diisocyanate and/or 2,6-tolylene-diisocyanate for the urethane prepolymer to make the polyurethane resin.