US4038265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vinyl benzyl ethers and nonionic water soluble thickening agents prepared therefrom
Assignee: Dow Chemical Co
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Filing: 1975-10-28
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Granted: 1977-07-26
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Expires: 1995-10-28
Abstract
Abstract Nonionic water soluble thickening agents are prepared by copolymerizing about 1 to 5 mole percent of a vinyl benzyl ether having the formula ##STR1## and the balance to make 100 mole percent of acrylamide.
Inventors
- 👤 Syamalarao Evani
- 👤 Frederick P. Corson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:18
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/337; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
77 words
A nonionic water soluble binary copolymeric thickening agent composed of in polymerized form about 1 to 5 mole percent of a vinyl benzyl ether monomer and the balance to make 100 percent of acrylamide, said ether monomer having the formula ##STR11## wherein R is hydrogen or methyl, m is about 10 to 100 and Y is --SR 1 , where R 1 is an alkyl, aralkyl or alkaryl hydrophobic group of 10 to about 22 carbon atoms.
Claim 2
Dependent Claim
77 words
A nonionic water soluble binary copolymeric thickening agent composed of in polymerized form about 1 to 5 mole percent of a vinyl benzyl ether monomer and the balance to make 100 percent of acrylamide, said ether monomer having the formula ##STR11## wherein R is hydrogen or methyl, m is about 10 to 100 and Y is --SR 1 , where R 1 is an alkyl, aralkyl or alkaryl hydrophobic group of 10 to about 22 carbon atoms.
Claim 3
Dependent Claim
22 words
The binary copolymeric thickening agent of claim 1 wherein the mole percent of said ether monomer is about 1 to 3 percent.
References Cited (Backward Citations)
US3190925A
Cited
US3794608A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |