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US 7,922,869 B2Granted
Shoe press belt
AssigneeIchikawa Co., Ltd.
InventorAtsushi Ishino
Life of this patent
Estimating the term…
Abstract
A shoe press belt for a paper machine includes a substrate and a polyurethane resin impregnated to laminate on the surfaces of both the shoe side and the felt side thereof, and is excellent in abrasion resistance, crack resistance and processability. A polyurethane resin is produced by using a combination of two kinds of diisocyanates, that is, tolylene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI) as starting materials.
Claims20
A shoe press belt comprising:
- a substrate having surfaces on a shoe side thereof and a felt side thereof;
- and
- a polyurethane resin impregnated and laminated on the surfaces of both the shoe side and the felt side of the substrate,
- wherein the polyurethane resin is obtained by reacting a mixed prepolymer with a dimethyl-thio-toluenediamine curing agent,
- wherein the mixed prepolymer consists of
- (1) a TDI prepolymer which is obtained by reacting a tolylene diisocyanate (TDI) with a polyol and has an isocyanate group at the end, and
- (2) an MDI prepolymer which is obtained by reacting diphenylmethane diisocyanate (MDI) with a polyol and has an isocyanate group at the end,
- wherein the TDI prepolymer and the MDI prepolymer are mixed at such a ratio that the polyurethane resin on the shoe side has an MDI molar content of 60 to 95% and the polyurethane resin on the felt side has an MDI molar content of 5 to 50%.
5 more elements
A shoe press belt comprising:
- a substrate having surfaces on a shoe side thereof and a felt side thereof;
- and
- a polyurethane resin impregnated and laminated on the surfaces of both the shoe side and the felt side of the substrate,
- wherein the polyurethane resin is obtained by reacting a urethane prepolymer with a dimethyl-thio-toluenediamine curing agent,
- wherein the urethane prepolmer is obtained by reacting a mixture of tolylene diisocyanate (TDI) and diphenylmethane diisocyanate (MDI) with a polyol and has an isocyanate group at the end,
- wherein the mixture of the TDI and the MDI is mixed at a ratio such that the polyurethane resin on the shoe side has mixed diisocyanate with an MDI molar content of 60 to 95% and the polyurethane resin on the felt side has mixed diisocyanate with an MDI molar content of 5 to 50%.
3 more elements
Dependencies are inferred from the claim text.