Method for the preparation of polymeric spacing particles
US5646210A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 15, 1995 |
| Grant date | Jul 8, 1997 |
| Priority date | — |
| Expiry date | Aug 15, 2015 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31786
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for the preparation of finely divided solid spherical polymer beads having an average particle size between about 0.1 and about 10 .mu.m and having a glass transition temperature of at least 40.degree. C. The method is a one step reaction in an aqueous reaction medium and said polymer beads are formed by the simultaneous reaction of PA1 1) a silane monomer comprising an .alpha.,.beta.-ethylenically unsaturated group, PA1 2) at least one .alpha.,.beta.-ethylenically unsaturated monomer, different from said silane monomer, capable of forming a polymer that is soluble in the monomer(s) present in said aqueous solvent mixture but which is insoluble in water PA1 3) a free radical-forming polymerization initiator that is soluble in the aqueous solvent mixture, and PA1 4) a graft-polymerizable polymer containing hydrophilic groups, and capable of forming a graft polymer that remains soluble in the aqueous reaction mixture.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.