Shoe press belt for paper making
US7943013B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 20, 2008 |
| Grant date | May 17, 2011 |
| Priority date | — |
| Expiry date | Jun 20, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G18/7614
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is a shoe press belt (10) which comprises a reinforcing fibrous base material (6) embedded in a polyurethane layer, and has an outer circumference layer (2a, 21) and an inner circumference layer (2b, 22) each formed with a polyurethane. The polyurethane layer comprises a polyurethane which is produced by curing a composition comprising a mixture of an urethane prepolymer (A) and a curing agent (B). The urethane prepolymer (A) is produced by reacting an isocyanate compound (a) containing 55 to 100 mol % of a p-phenylene-diisocyanate compound with polytetramethylene glycol (b) and has an isocyanate group at its terminal. The curing agent (B) is selected from the group consisting of 1,4-butanediol, hydroquinone bis-βhydroxylethyl ether, 3,5-diethyltoluenediamine and 3,5-dimethylthiotoluenediamine. The belt (10) has excellent cracking resistance, bending fatigue resistance and wear resistance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.