Process for the production of polyethers derived from oxetanes
US5210179A · kind A · utility
15Cited by
3References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 28, 1992 |
| Grant date | May 11, 1993 |
| Priority date | — |
| Expiry date | Jan 28, 2012 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G65/22
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Hydroxyterminated prepolymers, used in curing reactions with isocyanates to produce elastomers, are prepared by continuously adding over periods of 12-50 hours an oxetane monomer to a reaction mixture containing a diol initiator and a catalyst capable of catalyzing the cationic quasi-living cationic polymerization of the monomer, the rate of addition to maintain stoichiometric excess over the monomer. Polymerization is terminated by adding brine. Polymers of increased molecular weight and reduced impurity levels result.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.