US3903056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modification of carboxy-containing polymers by treatment with cyclic sulfonium compounds
Assignee: Dow Chemical Co
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Filing: 1973-09-04
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Granted: 1975-09-02
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Expires: 1993-09-04
Abstract
Abstract Carboxy-containing polymers are usually water-soluble or watersensitive. These hydrophilic properties can be reduced or eliminated by treatment with an S-aryl cyclic sulfonium compound of the formula WHEREIN EACH R independently is Cl, alkyl, alkoxy, phenyl, phenoxy or the like; each R'' is independently H, Cl, alkyl, alkoxy, phenyl or phenoxy; Z is a linking element which may be a chemical bond, O, S, alkylene or alkylenedioxy, wherein said alkylene moieties may be interrupted by O, S, phenylene or the like; m is 0-3, n is O to about 4, p is 2 or 3 and X is a neutralizing anion.
Inventors
- 👤 Donald L Schmidt
- 👤 Hugh B Smith
- 👤 Melvin J Hatch
- 👤 William E Broxterman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:29
CPC Classifications
C; C07; C07D; C07D333/00; C07D333/02; C07D333/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
24 words
THE METHOD OF REDUCING THE WATER SENSITIVITY OF A CARBOXY-CONTAINING POLYMER COMPRISING REACTING BY CONTACTING THE POLYMER WITH A SULFONIUM COMPOUND OF THE FORMULA
Claim 2
Independent Claim
24 words
THE METHOD OF REDUCING THE WATER SENSITIVITY OF A CARBOXY-CONTAINING POLYMER COMPRISING REACTING BY CONTACTING THE POLYMER WITH A SULFONIUM COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the polymer is a copolymer of acrylic, methacrylic, maleic or itaconic acid with at least one other unsaturated monomer copolymerizable therewith.
Claim 4
Dependent Claim
12 words
The method of claim 1 where, in Formula I, n is zero.
Claim 5
Dependent Claim
12 words
The method of claim 1 where, in Formula I, n is 1-2.
Claim 6
Dependent Claim
12 words
The method of claim 1 where, in Formula I, m is zero.
Claim 7
Dependent Claim
12 words
The method of claim 1 where, in Formula I, p is 2.
Claim 8
Dependent Claim
17 words
The method of claim 1 wherein the reaction is conducted at a temperature not exceeding about 80*C.
Claim 9
Dependent Claim
33 words
The composition of matter comprising an aqueous solution of a carboxy-containing polymer and an amount of a compound of Formula I sufficient to reduce the water sensitivity of said polymer when reacted therewith.
Claim 10
Dependent Claim
33 words
The composition of matter comprising an aqueous solution of a carboxy-containing polymer and an amount of a compound of Formula I sufficient to reduce the water sensitivity of said polymer when reacted therewith.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-01 | 1979-03-03 | 1979-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-01 | 1983-03-03 | 1983-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-01 | 1987-03-03 | 1987-09-02 | $7700.00 | Window Closed / Lapsed |