Claims
- 1. In the process of preparing hard, crosslinked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer, and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of from about 0.01 to about 10 millimoles per mole of monomers, in the monomer mixture (a) and (b), said modifier being an organic compound containing acetyleneic unsaturation, said compound being capable of moderating rate of polymerization.
- 2. The process of claim 1 wherein the monovinyl monomer is a monovinyl aromatic monomer.
- 3. The process of claim 2 wherein the monovinyl aromatic monomer is styrene and the crosslinking monomer is divinylbenzene.
- 4. The process of claim 3 wherein the concentration of modifier is from 0.1 to 10 millimoles per mole of monomers in the monomer mixture (a) and (b).
- 5. The process of claim 3 wherein the modifier is phenylacetylene.
- 6. In the process of preparing hard, cross-linked, discrete copolymer beads by the free-radical polymerization in an aqueous dispersion of a monomer mixture comprised of a major proportion of (a) monovinyl monomer and a minor proportion of (b) crosslinking monomer having at least two active vinyl groups, the improvement which comprises conducting the polymerization reaction with a modifier in admixture with the monomer mixture in a concentration of about 0.01 to about 10 millimole per mole of monomers in the monomer mixture (a) and (b), said modifier being an organic compound containing allylic unsaturation and being selected from the group consisting of terpinolene and the dimer of methylcyclopentadiene, said compound being capable of moderating rate of polymerization.
- 7. The process of claim 6 wherein the monovinyl monomer is a monovinyl aromatic monomer.
- 8. The process of claim 7 wherein the monovinyl aromatic monomer is styrene and the crosslinking monomer is divinylbenzene.
- 9. The process of claim 6 wherein the modifier is terpinolene.
- 10. The process of claim 6 wherein the modifier is the dimer of methylcyclopentadiene.
Parent Case Info
This application is a continuation-in-part of our copending U.S. patent application Ser. No. 797,716 filed May 17, 1977 now abandoned.
US Referenced Citations (4)
Number |
Name |
Date |
Kind |
2241770 |
Dreisbach et al. |
May 1941 |
|
2290547 |
Dreisbach et al. |
Jul 1942 |
|
3674728 |
Carbonnel et al. |
Jul 1972 |
|
3976629 |
Hayward et al. |
Aug 1976 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
1261427 |
Jan 1972 |
GBX |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
797716 |
May 1977 |
|