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US4087599A
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Preparation of a water-soluble polyvinylbenzyl quaternary ammonium halide
Assignee: Dow Chemical Co
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Filing: 1976-08-19
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Granted: 1978-05-02
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Expires: 1996-08-19
Abstract
Abstract A process for preparation of water-soluble polyvinylbenzyl quaternary ammonium halides by the halomethylation and subsequent quaternization of a polystyrene with the improvement that said polystyrene is a cationically-initiated polystyrene of about 1000 to about 50,000 M w and M w /M n ratio of less than about 8, preferably having less than about 0.1 mole percent residual unsaturation. The quaternized product is useful as a water clarifier and as electroconductive film for copying paper and the like.
Inventors
- 👤 James M. Roe
- 👤 Duane B. Priddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:47
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
73 words
In a process for preparing a water-soluble, polyvinylbenzyl quaternary ammonium halide comprising contacting a polystyrene reactant with a halomethylating agent in the presence of a halomethylation catalyst to form a halomethylated polystyrene and thereafter contacting said halomethylated polystyrene with a tertiary amine: the improvement of employing as the polystyrene reactant a cationically-initiated polystyrene of M w about 1,000 to about 50,000 and a M w /M n ratio of less than about 8.
Claim 2
Dependent Claim
73 words
In a process for preparing a water-soluble, polyvinylbenzyl quaternary ammonium halide comprising contacting a polystyrene reactant with a halomethylating agent in the presence of a halomethylation catalyst to form a halomethylated polystyrene and thereafter contacting said halomethylated polystyrene with a tertiary amine: the improvement of employing as the polystyrene reactant a cationically-initiated polystyrene of M w about 1,000 to about 50,000 and a M w /M n ratio of less than about 8.
Claim 3
Dependent Claim
13 words
The process of claim 1 wherein the halomethylating agent is a chloromethylating agent.
Claim 4
Dependent Claim
55 words
The process of claim 1 wherein the tertiary amine is pyridine or a compound represented by the formula NR 1 R 2 R 3 wherein R 1 , R 2 and R 3 are independently --CH 2 CH 2 OH, --CH 2 CHOHCH 3 , --CH 2 CHOHCH 2 OH, alkyl, aryl, aralkyl or cycloalkyl.
Claim 5
Dependent Claim
17 words
The process of claim 3 wherein R 1 , R 2 and R 3 are all methyl.
Claim 6
Dependent Claim
18 words
The process of claim 1 wherein the cationically-initiated polystyrene has M w of about 4,000 to about 30,000.
Claim 7
Dependent Claim
22 words
The process of claim 1 wherein the cationically-initiated polystyrene has a M w /M n ratio of about 3 to about 5.
Claim 8
Dependent Claim
24 words
The process of claim 1 wherein the water-soluble polyvinylbenzyl quaternary ammonium halide produced thereby has a Gardner color of about one unit or less.
Claim 9
Dependent Claim
18 words
The process of claim 1 wherein the polystyrene reactant has less than about 0.1 weight percent residual unsaturation.
Claim 10
Dependent Claim
24 words
The process of claim 1 wherein the cationically-initiated polystyrene has M w of about 13,000-21,000, and a M w /M n of about 5.
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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |