Resilient hydrophobic foamed polymer
US4266043A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 5, 1979 |
| Grant date | May 5, 1981 |
| Priority date | — |
| Expiry date | Nov 5, 1999 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S521/914
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A resilient hydrophobic foamed polymer obtained by reacting a mixture of an isocyanate terminated urethane prepolymer and a polyisocyanate (A) with aqueous material, said prepolymer being relatively hydrophilic and the reaction product of a molar excess of a polyisocyanate (B) with a polyetherpolyol having from 15 to 50% by weight of oxethylene content, said aqueous material having a water content between about 15 to 150% by weight based on said prepolymer, the amount of said polyisocyanate (A) ranging between about 5 to 15% by weight based on said prepolymer, said polyetherpolyol being selected from the group consisting of (a) the addition polymerization product of a starting material, ethylene oxide and another epoxide and (b) a mixture of at least two of the following: PA1 (1) The addition polymerization product of a starting material and ethylene oxide; PA1 (2) the addition polymerization product of a starting material and an epoxide other than ethylene oxide; PA1 (3) the addition polymerization material, ethylene oxide and another epoxide, PA1 and said starting material being selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol; dipropylen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.