Water-blown polyurethane sealing devices and compositions for producing same
US5532403A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1995 |
| Grant date | Jul 2, 1996 |
| Priority date | — |
| Expiry date | Oct 25, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G2410/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed as a particular isocyanate prepolymer composition particularly suitable for use in polyurethane compositions having particular applicability for producing microcellular molded polyurethane articles particularly suitable for use as sealing devices. In particular, the isocyanate prepolymer composition is the result of reacting an isocyanate blend (a) having PA1 (i) 0 to 10 pbw 2,4'-diphenylmethane diisocyanate; PA1 (ii) 30 to 80 pbw 4,4'-diphenylmethane diisocyanate; PA1 (iii) 1 to 10 pbw of a mixture of uretonimine with from 10 to 70 parts by weight of a polyol (b) having a number average molecular weight of between 1000 and 10,000, and a hydroxyl number of between 10 to 75. The resulting isocyanate prepolymer (I) has a free NCO of less than 20 and a viscosity of from 200 to 1000 cPs.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.