Bead size distribution in the suspension polymerization of vinyl aromatic monomers in the presence of glutamic acid
US4170699A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 1978 |
| Grant date | Oct 9, 1979 |
| Priority date | — |
| Expiry date | Jun 29, 1998 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F12/04
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The production of polymer beads by a suspension polymerization process in which a vinyl aromatic monomer having a free-radical generating catalyst dissolved therein is suspended in an aqueous medium with the aid of from 0.1 to 2.0 percent by weight, based on monomer, of a finely divided phosphate suspending agent in the presence of a modifier and heated to cause the monomer to polymerize into polymer beads is improved by the addition to the suspension of at least about 0.01 percent by weight based on monomer of an adjunct modifier, glutamic acid. Although the process of the invention is especially applicable in the preparation of large polymer beads, the glutamic acid also makes it possible to prepare the smaller polymer beads having narrow particle size distribution, also.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.