US4334049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of finely divided solid polymers in polyol
Assignee: BASF Corp
•
Filing: 1980-08-18
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Granted: 1982-06-08
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Expires: 2000-08-18
Abstract
Abstract Finely-divided polymeric solids are prepared by free-radical polymerization on ethylenically unsaturated monomer or monomers in an organic solvent employing an alkylene oxide adduct of a styrene-allyl alcohol copolymer stabilizer.
Inventors
- 👤 Gerhard G. Ramlow
- 👤 Duane A. Heyman
- 👤 Richard A. Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08F; C08F2/00; C08F2/04; C08F2/06; C08F2/08; C08F291/00; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/63; C08J3/00; C08J3/12; C08J2357/00; C08J2375/00; C08J2375/04; C08J2457/00; Y; Y10; Y10S; Y10S526/00; Y10S526/91
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
In a process for the preparation of a finely divided solid polymer prepared by polymerizing in the presence of a free-radical initiator, and an organic solvent, an ethylenically unsaturated monomer or mixture of monomers, the improvement comprises, conducting said polymerization in the presence of an effective amount of a preformed polymeric stabilizer wherein said stabilizer consists of an alkylene oxide adduct of a copolymer of styrene-allyl alcohol, said stabilizer having an equivalent weight of 220 to 8000.
Claim 2
Dependent Claim
77 words
In a process for the preparation of a finely divided solid polymer prepared by polymerizing in the presence of a free-radical initiator, and an organic solvent, an ethylenically unsaturated monomer or mixture of monomers, the improvement comprises, conducting said polymerization in the presence of an effective amount of a preformed polymeric stabilizer wherein said stabilizer consists of an alkylene oxide adduct of a copolymer of styrene-allyl alcohol, said stabilizer having an equivalent weight of 220 to 8000.
Claim 3
Dependent Claim
22 words
The process of claim 1 wherein the monomer is selected from the group consisting of acrylonitrile, styrene, methyl methacrylate and mixtures thereof.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the monomer is acrylonitrile.
Claim 5
Dependent Claim
10 words
The process of claim 1 wherein the monomer is styrene.
Claim 6
Dependent Claim
11 words
The process of claim 1 wherein the monomer is methyl methacrylate.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein the free radical initiator is azobis(isobutyronitrile).
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the free radical initiator is 2-t-butylazo-2-cyano-4-methylpentane.
Claim 9
Dependent Claim
27 words
The process of claim 1 wherein said copolymer contains from 15 weight percent to 85 weight percent styrene, and an equivalent weight range from 58 to 4000.
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein the alkylene oxide is selected from the group consisting of ethylene oxide, propylene oxide and butylene oxide.
Claim 11
Dependent Claim
27 words
The process of claim 1 wherein the concentration of ethylenically unsaturated monomer is from one to 50 weight percent based on the total weight of the product.
Claim 12
Dependent Claim
17 words
The process of claim 1 wherein the stabilizer is employed in a 10:1 to 1:1 monomer:stabilizer ratio.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |