Patent US4171418A successfully refreshed from Google Patents.
US4171418A
Expired / Lapsed
US
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Cationic and amphoteric surfactants
Assignee: Wyeth Holdings LLC
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Filing: 1977-11-22
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Granted: 1979-10-16
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Expires: 1997-11-22
Abstract
Abstract Novel water-soluble acrylamide copolymers contain 40 to 70 percent by weight acrylamide units, at least 30 percent of hydrophobic vinyl units and at least 10 percent of vinyl units having ionic properties. In aqueous solution these copolymers have the properties of cationic or amphoteric surface active agents.
Inventors
- 👤 Girish C. Barua
- 👤 Daniel E. Nagy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/52; C08F220/54; C08F220/56; Y; Y10; Y10S; Y10S526/00; Y10S526/923
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
68 words
A water-soluble vinyl addition copolymer consisting of copolymerized vinyl monomeric units of which 30 to 70 percent by weight consist of acrylamide units, at least 30 percent by weight consist of at least one nonionic vinyl monomer unit having hydrophobic properties and at least 10 percent by weight consist of vinyl monomer units having ionic properties in aqueous solution, said copolymer having surface active properties in aqueous solution.
Claim 2
Dependent Claim
68 words
A water-soluble vinyl addition copolymer consisting of copolymerized vinyl monomeric units of which 30 to 70 percent by weight consist of acrylamide units, at least 30 percent by weight consist of at least one nonionic vinyl monomer unit having hydrophobic properties and at least 10 percent by weight consist of vinyl monomer units having ionic properties in aqueous solution, said copolymer having surface active properties in aqueous solution.
Claim 3
Dependent Claim
20 words
A water-soluble copolymer defined by claim 1 wherein all of said vinyl monomer units having ionic properties are cationic units.
Claim 4
Dependent Claim
40 words
A water-soluble copolymer defined by claim 1 wherein those vinyl monomeric units having ionic properties in the polymer molecule consist of equivalent ionic proportions of cationic and anionic units to provide a copolymer having amphoteric ionic properties in aqueuos solution.
Claim 5
Dependent Claim
28 words
A water-soluble copolymer defined by claim 1 wherein said nonionic units having hydrophobic properties are addition polymerized units of nonionic monomers selected from isobutoxymethyl acrylamide, butylacrylate and t-butylacrylamide.
Claim 6
Dependent Claim
15 words
A water-soluble copolymer defined by claim 4 wherein the defined nonionic monomer is isobutoxymethyl acrylamide.
Claim 7
Dependent Claim
37 words
A water-soluble copolymer defined by claim 1 wherein the defined vinyl monomer units having ionic properties consist of copolymerized units of at least one monomer selected from dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylamide, diethylaminoethyl methacrylate and methacrylamidopropyl trimethyl-ammonium chloride.
Claim 8
Dependent Claim
57 words
A water-soluble copolymer defined by claim 1 wherein the defined vinyl monomer units having ionic properties consist of copolymerized units of ionic equivalent amounts of at least one cationic monomer selected from methacrylamidopropyl triethylammonium chloride, diethylamino ethyl methacrylate, dimethylaminoethyl methacrylate, dimethylaminopropyl methacrylamide and at least one anionic monomer selected from vinyl acids, their salts and ionizable esters.
Claim 9
Dependent Claim
19 words
A water-soluble copolymer defined by claim 5 wherein the ionizable monomer units are copolymerized units of methacrylamidopropyl trimethylamino chloride.
Claim 10
Dependent Claim
34 words
A water-soluble copolymer defined by claim 5 wherein the defined ionizable monomer units consist of ionic equivalent amounts of copolymerized methacrylamidopropyl triethylamino chloride and a vinyl acid or a salt or ionizable ester thereof.
Claim 11
Dependent Claim
30 words
A water-soluble copolymer defined by claim 9 wherein the vinyl acid is selected from the group consisting of acrylic acid, itaconic acid, methacrylic acid, sodium vinyl sulfonate and 2-acrylamido-2-methylpropanesulfonic acid.
Claim 12
Dependent Claim
31 words
A water-soluble copolymer defined by claim 7 wherein the anionic monomers are selected from the group consisting of acrylic acid, itaconic acid, methacrylic acid, sodium vinyl sulfonate and 2-acrylamido-2-methylpropane sulfonic acid.
References Cited (Backward Citations)
US2978432A
Cited
US2909508A
Cited
US3117108A
Cited
US3340238A
Cited
US3312671A
Cited
US3336270A
Cited
US3509113A
Cited
US3551525A
Cited
US3799910A
Cited
US3692673A
Cited
US3821175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |