Method for producing a spherical ion exchange resin
US5637627A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 20, 1996 |
| Grant date | Jun 10, 1997 |
| Priority date | — |
| Expiry date | Feb 20, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F8/44
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method for producing a spherical crosslinked copolymer, which comprises polymerizing a monofunctional addition-polymerizable monomer and at least 0.5% by weight of a polyfunctional addition-polymerizable monomer on the basis of the total weight of monomers by suspension polymerization in an aqueous medium in the presence of a radical polymerization initiator of the following formula (b) which has a decomposition temperature for a half-life period of 10 hours within a range of from 60.degree. to 120.degree. C. and which is capable of forming at least four radical initiating points per molecule by the decomposition: EQU (R.sub.4 --O--O.paren close-st..sub.m R.sub.5 (b) wherein R.sub.4 is a linear or branched C.sub.1-10 alkyl group, R.sub.5 is a m-valent C.sub.4-25 hydrocarbon group, and m is an integer of at least 2, wherein the plurality of R.sub.4 per molecule may be the same or different.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.