Shoe Press Belt
AssigneeIchikawa Co., Ltd.
InventorAtsushi Ishino
Life of this patent
Estimating the term…
Abstract
The present invention relates to a shoe press belt for a paper machine, comprising a substrate and a polyurethane resin impregnated to laminate on the surfaces of both the shoe side and the felt side thereof, which is excellent in abrasion resistance, crack resistance and processability. In the present invention, 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.
Claims19
A shoe press belt comprising a substrate and a polyurethane resin impregnated to laminate on the surfaces of both the shoe side and the felt side thereof, wherein the polyurethane resin on the both sides is obtained by reacting a mixed prepolymer consisting of a TDI prepolymer which is obtained by reacting a tolylene diisocyanate (TDI) with a polyol and has an isocyanate group at the end and an MDI prepolymer which is obtained by reacting diphenylmethane diisocyanate (MDI) with a polyol and has an isocyanate group at the end, with a curing agent;
- and the TDI prepolymer and the MDI prepolymer are mixed at such a ratio that the polyurethane resin on the shoe side has a higher MDI molar content than the polyurethane resin on the felt side.
A shoe press belt comprising a substrate and a polyurethane resin impregnated to laminate on the surfaces of both the shoe side and the felt side thereof, wherein the polyurethane resin is obtained by reacting a urethane prepolymer which 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, with a curing agent;
- and the TDI and the MDI are mixed at such a ratio that the polyurethane resin on the shoe side has a higher MIDI molar content than the polyurethane resin on the felt side.
Dependencies are inferred from the claim text.