US4328141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of rosin dispersions with low molecular weight non-ionic polymers
Assignee: Wyeth Holdings LLC
•
Filing: 1981-04-02
•
Granted: 1982-05-04
•
Expires: 2001-04-02
Abstract
Abstract Low molecular weight, non-ionic copolymers of acrylamide and a monomer selected from the group consisting of styrene, alkyl (C4-C24) substituted acrylamides and ethylene provide improved mechanical and heat stability to colloidal aqueous rosin dispersions.
Inventors
- 👤 John P. Farewell
- 👤 David W. Lipp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:51
CPC Classifications
C; C08; C08L; C08L93/00; C08L93/04
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
79 words
A rosin dispersion consisting essentially of a paper sizing rosin as dispersed phase in an aqueous medium as continuous phase, said medium having incorporated therein a stabilizingly effective amount of a non-ionic copolymer of acrylamide and a hydrophobic monomer selected from the group consisting of styrene, alkyl (C 4 -C 24 ) substituted acrylamides and ethylene, wherein the molecular weight of the copolymer is such that the viscosity for a 10% solution thereof is about 30 to 100 centipoises.
Claim 2
Dependent Claim
79 words
A rosin dispersion consisting essentially of a paper sizing rosin as dispersed phase in an aqueous medium as continuous phase, said medium having incorporated therein a stabilizingly effective amount of a non-ionic copolymer of acrylamide and a hydrophobic monomer selected from the group consisting of styrene, alkyl (C 4 -C 24 ) substituted acrylamides and ethylene, wherein the molecular weight of the copolymer is such that the viscosity for a 10% solution thereof is about 30 to 100 centipoises.
Claim 3
Dependent Claim
14 words
The dispersion of claim 1 wherein the viscosity is about 40 to 80 centipoises.
Claim 4
Dependent Claim
22 words
The dispersion of claim 1 wherein the copolymer contains about 75% to 95%, by weight, acrylamide and about 25% to 5% styrene.
Claim 5
Dependent Claim
18 words
The dispersion of claim 3 wherein the copolymer contains about 85%, by weight, acrylamide and about 15% styrene.
Claim 6
Dependent Claim
31 words
The dispersion of claim 1 wherein the copolymer contains about 40% to 80%, by weight, acrylamide and about 60% to 20% of an alkyl (C 4 -C 24 ) substituted acrylamide.
Claim 7
Dependent Claim
27 words
The dispersion of claim 5 wherein the copolymer contains about 60%, by weight, acrylamide and about 40% of an alkyl (C 4 -C 24 ) substituted acrylamide.
Claim 8
Dependent Claim
15 words
The dispersion of claim 5 or claim 6 wherein the alkyl substituted acrylamide is t-butylacrylamide.
Claim 9
Dependent Claim
22 words
The dispersion of claim 1 wherein the copolymer is of acrylamide and ethylene and contains about 50 to 75%, by weight, acrylamide.
Claim 10
Dependent Claim
14 words
The dispersion of claim 8 wherein the copolymer contains about 70%, by weight, acrylamide.
Claim 11
Dependent Claim
36 words
The dispersion of claim 8 or claim 9 wherein the copolymer is prepared by reacting an n-alkyl mercaptan or an n-alkyl phosphine, wherein the alkyl group contains from about 12 to 18 carbon atoms, with acrylamide.
Claim 12
Dependent Claim
11 words
The dispersion of claim 10 wherein the n-alkyl mercaptan is N-dodecylthiol.
Claim 13
Dependent Claim
24 words
The dispersion of claim 1 wherein the copolymer is present in an amount equal to from about 0.5% to 2.0%, based on the rosin.
Claim 14
Dependent Claim
24 words
The dispersion of claim 1 wherein the copolymer is present in an amount equal to from about 0.8% to 1.4%, based on the rosin.
Claim 15
Dependent Claim
24 words
The dispersion of claim 1 wherein the copolymer is present in an amount equal to from about 1.0% to 1.2%, based on the rosin.
Claim 16
Independent Claim
68 words
A method of stabilizing an aqueous dispersion of paper sizing rosin comprising incorporating therein an effective stabilizing amount of a non-ionic copolymer of acrylamide and a hydrophobic monomer selected from the group consisting of styrene, alkyl (C 4 -C 24 ) substituted acrylamide and ethylene, wherein the molecular weight of the copolymer is such that the viscosity for a 10% solution thereof is about 30 to 100 centipoises.
Claim 17
Independent Claim
68 words
A method of stabilizing an aqueous dispersion of paper sizing rosin comprising incorporating therein an effective stabilizing amount of a non-ionic copolymer of acrylamide and a hydrophobic monomer selected from the group consisting of styrene, alkyl (C 4 -C 24 ) substituted acrylamide and ethylene, wherein the molecular weight of the copolymer is such that the viscosity for a 10% solution thereof is about 30 to 100 centipoises.
Claim 18
Dependent Claim
21 words
The method of claim 15 wherein the copolymer contains about 75% to 95%, by weight, acrylamide and 25% to 5% styrene.
Claim 19
Dependent Claim
31 words
The method of claim 15 wherein the copolymer contains about 40% to 80%, by weight, acrylamide and about 60% to 20% of an alkyl (C 4 -C 24 ) substituted acrylamide.
Claim 20
Dependent Claim
22 words
The method of claim 15 wherein the copolymer is of acrylamide and ethylene and contains about 50 to 75%, by weight, acrylamide.
Claim 21
Dependent Claim
33 words
The method of claim 18 wherein the copolymer is prepared by reacting an n-alkyl mercaptan or an n-alkyl phosphine, wherein the alkyl group contains from about 12 to 18 carbon atoms, with acrylamide.
Claim 22
Dependent Claim
24 words
The method of claim 15 wherein the copolymer is present in an amount equal to from about 0.5% to 2.0%, based on the rosin.
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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) | 1985-05-03 | 1985-11-02 | 1986-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-05-03 | 1989-11-02 | 1990-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-05-03 | 1993-11-02 | 1994-05-04 | $7700.00 | Window Closed / Lapsed |