Shoe press belt and method for producing a shoe press belt
AssigneeIchikawa Co., Ltd.
InventorsYuya Takamori, Manami Morinaga
Life of this patent
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Abstract
The object of the invention is to provide a shoe press belt which has an excellent strength while the variation in strength among its parts being suppressed, and to provide a method for producing such a shoe press belt. Provided is a shoe press belt for use in a papermaking machine comprising at least one resin layer, wherein the resin layer comprises a polyurethane resin formed by curing an urethane prepolymer having an isocyanate group with a curing agent having an active hydrogen group, wherein the curing agent comprises one or more polycarbonate diol(s) expressed by the following formulae (1) and (2). HO-Am-Bn—R1OH (1)
Claims11
A shoe press belt for use in a papermaking machine, comprising at least one resin layer, wherein:
- the resin layer comprises a polyurethane resin formed by curing an urethane prepolymer having an isocyanate group with a curing agent having an active hydrogen group, wherein:
- the curing agent is free of a polyamine compound and consists of one or more polyol(s) comprising one or more polycarbonate diol(s) expressed by the following formula (1):
- HO-Am-Bn—R1OH (1)
- wherein:
- in the formula (1),
- A and B are each differently a unit expressed by the following formula (2):
- R1 is a linear, branched or cyclic alkylene group having 1 or more and 20 or less of (a) carbon atom(s),
- m and n are each independently an integer from 1 to 46, and
- in the formula (2),
- R2 is a linear alkylene group having 1 or more and 20 or less of (a) carbon atom(s), and wherein:
- the polyurethane resin has a higher breaking strength as compared to a comparative polyurethane resin formed by curing the urethane prepolymer with a curing agent comprising a polyamine compound.
A method for producing a shoe press belt for use in a papermaking machine, the method comprising:
- forming a resin layer comprising a polyurethane resin by curing an urethane prepolymer having an isocyanate group with a curing agent having an active hydrogen group,
- wherein:
- the curing agent is free of a polyamine compound and consists of one or more polyol(s) comprising one or more polycarbonate diol(s) expressed by the following formula (1):
- HO-Am-Bn—R1OH (1)
- wherein:
- in the formula (1),
- A and B are each differently a unit expressed by the following formula (2):
- R1 is a linear, branched or cyclic alkylene group having 1 or more and 20 or less of (a) carbon atom(s),
- m and n are each independently an integer from 1 to 46, and
- in the formula (2),
- R2 is a linear alkylene group having 1 or more and 20 or less of (a) carbon atom(s), and wherein:
- the polyurethane resin has a higher breaking strength as compared to a comparative polyurethane resin formed by curing the urethane prepolymer with a curing agent comprising a polyamine compound.
Dependencies are inferred from the claim text.