Claims
- 1. A radical polymerization process for producing a styrene base polymer, which comprises;
- (a) subjecting styrene or a styrene compound and a radical scavenger to thermal polymerization,
- (1) a concentration of the radical scavenger to styrene or the styrene compound being from 3.0.times.10.sup.-3 to 5.0.times.10.sup.-2 mol %, and
- (2) a polymerization temperature ranging from 100.degree. C. to 140.degree. C., provided that the concentration of the radical scavenger (C) and the polymerization temperature (T) satisfy the following formula,
- 100C+0.088T.ltoreq.13.8 ,
- and
- (b) continuing the polymerization to a polymerization conversion of from 40 to 85%.
- 2. A process according to claim 1, wherein styrene and the radical scavenger are subjected to the thermal polymerization.
- 3. A process according to claim 1, wherein a styrene compound selected from .alpha.-substituted styrenes and nuclear-substituted styrenes and the radical scavenger are subjected to the thermal polymerization.
- 4. A process according to claim 1, wherein the thermal polymerization is carried out in the presence of a compound copolymerizable with styrene or the styrene compound.
- 5. A process according to claim 1, wherein the radical scavenger is a member selected from 2,2,6,6-tetramethyl-1-piperidinyloxy, 4-amino-2,2,6,6-tetramethyl-1-piperidinyloxy, 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy, 4-oxo-2,2,6,6-tetramethyl-1-piperidinyloxy, 4,4-dimethyl-3-oxazolinyloxy, 2,2,5,5-tetramethyl-1-pyrrolidinyloxy, phenyl-t-butyl nitroxide, and 2,2-di(4-t-octylphenyl)-1-picrylhydrazyl.
- 6. A process according to claim 1, wherein the thermal polymerization is carried out in a manner of a batchwise or continuous bulk process.
Priority Claims (2)
Number |
Date |
Country |
Kind |
7-292741 |
Nov 1995 |
JPX |
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7-292741 |
Nov 1995 |
JPX |
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Parent Case Info
This application is a continuing application of Ser. No. 08/747,668, filed Nov. 12, 1996, now abandoned.
US Referenced Citations (5)
Number |
Name |
Date |
Kind |
5115055 |
Dias et al. |
May 1992 |
|
5115066 |
Zimmermann et al. |
May 1992 |
|
5322912 |
Georges et al. |
Jun 1994 |
|
5401804 |
Georges et al. |
Mar 1995 |
|
5549998 |
Georges et al. |
Aug 1996 |
|
Foreign Referenced Citations (4)
Number |
Date |
Country |
6199916 |
Jul 1994 |
JPX |
9411412 |
May 1994 |
WOX |
9413705 |
Jun 1994 |
WOX |
9613527 |
May 1996 |
WOX |
Non-Patent Literature Citations (1)
Entry |
J.M.S.-Pure Appl. Chem., A31(11), pp. 1561-1578 (1994) "Controlled Radical Polymerization". |
Continuations (1)
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Number |
Date |
Country |
Parent |
747668 |
Nov 1996 |
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