Free radical initiator delivery system
US5510307A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 1994 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Nov 28, 2014 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F271/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
This invention relates to an improved polymerization free radical initiator delivery system for the polymerization of monomers containing olefinic unsaturation and to the preparation of the initiator which comprises dissolving a water insoluble free radical initiator and an excess amount of the polymeric product of the reaction in a mutual organic solvent having a boiling point below 140.degree. C., in the presence of between about 1.0 and 100 wt. % of a surfactant based on weight of initiator and mixing the resulting solution to achieve uniform molecular distribution of initiator and polymer molecules in the surfactant/solvent mixture; removing the solvent to provide coprecipitated initiator/polymer microparticles and then diluting the coprecipitated microparticles with water under vigorous agitation to form a microparticle emulsion of low viscosity which is suitable as the initiator feed for contact with monomer in a polymerization reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.