US3984361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of graft polymer latexes by sonification
Assignee: United States Department of Agriculture
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Filing: 1975-05-30
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Granted: 1976-10-05
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Expires: 1995-05-30
Abstract
Abstract Starch graft polymer latexes as well as processes for their preparations are disclosed. The starch graft latexes are water-dispersed grafted starch particles (300-1500 A in size) consisting of either (1) a cationic starch graft polymerized with up to 66% by weight of either nonionic or cationic vinyl monomers alone or with selected combinations thereof or (2) a nonionic starch graft polymerized with a cationic monomer alone or in combination with nonionic monomers. The latexes, having a range of properties, dry at 25 DEG C. or at higher temperatures to clear continuous films.
Inventors
- 👤 Lewis A. Gugliemelli
- 👤 Charles L. Swanson
- 👤 Charles R. Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:48
CPC Classifications
C; C08; C08F; C08F251/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
99 words
A method of producing stable latexes comprising the following steps: a. graft polymerizing gelatinized cationic starch with a vinyl monomer in quantities such that a vinyl monomer add-on of from about 10% to 200% occurs in the presence of a cerium(IV) initiator in an aqueous media containing from 1% to 20% solids; and sonicating the dispersion resulting from step (a) at 20 KHz for 1-3 minutes to form a stable dispersion containing cationic starch graft latex solids having particle diameters of from 300 to 1500 A, said stable dispersion having a Brookfield viscosity of from 10 to 100 cp.
Claim 2
Independent Claim
99 words
A method of producing stable latexes comprising the following steps: a. graft polymerizing gelatinized cationic starch with a vinyl monomer in quantities such that a vinyl monomer add-on of from about 10% to 200% occurs in the presence of a cerium(IV) initiator in an aqueous media containing from 1% to 20% solids; and sonicating the dispersion resulting from step (a) at 20 KHz for 1-3 minutes to form a stable dispersion containing cationic starch graft latex solids having particle diameters of from 300 to 1500 A, said stable dispersion having a Brookfield viscosity of from 10 to 100 cp.
Claim 3
Dependent Claim
20 words
A method as described in claim 1 wherein the gelatinized cationic starch is gelatinized quaternary amine- or tertiary amine-starch ethers.
Claim 4
Dependent Claim
26 words
A method as described in claim 1 wherein the vinyl monomer is a vinyl secondary amine or a vinyl quaternary amine, or mixtures of the same.
Claim 5
Dependent Claim
23 words
A method as described in claim 1 wherein the vinyl monomer is acrylonitrile, methylacrylate, methacrylonitrile, N,N,N-triethylaminomethacrylate, or t-butylaminoethylmethacrylate, or mixtures of the same.
Claim 6
Dependent Claim
20 words
A method as described in claim 1 wherein the gelatinized cationic starch is diethylaminoethyl starch ether or 2-hydroxypropyltrimethylammonium starch ether.
Claim 7
Dependent Claim
24 words
A method as described in claim 1 wherein the gelatinized cationic starch has a cationic degree of substitution of from about 0.01 to 0.1.
Claim 8
Dependent Claim
25 words
A method as described to claim 1 wherein the viscosity of the dispersion resulting from step (a) is reduced to from 10 to 40 cp.
Claim 9
Independent Claim
90 words
A method of producing stable latexes comprising the following steps: a. graft polymerizing gelatinous starch with a cationic vinyl monomer in quantities such that a cationic vinyl monomer add-on of about 10% to 200% occurs in the presence of a cerium(IV) initiator in an aqueous media containing from 1% to 20% solids; and b. reducing the viscosity of the dispersion resulting from step (a) to from 10 to 100 cp. to produce a stable dispersion containing starch graft cationic latex solids having particle diameters of from 300 to 1500 A.
Claim 10
Independent Claim
90 words
A method of producing stable latexes comprising the following steps: a. graft polymerizing gelatinous starch with a cationic vinyl monomer in quantities such that a cationic vinyl monomer add-on of about 10% to 200% occurs in the presence of a cerium(IV) initiator in an aqueous media containing from 1% to 20% solids; and b. reducing the viscosity of the dispersion resulting from step (a) to from 10 to 100 cp. to produce a stable dispersion containing starch graft cationic latex solids having particle diameters of from 300 to 1500 A.
Claim 11
Dependent Claim
28 words
A method as described in claim 10 wherein the cationic vinyl monomer is a vinyl seconary amine or a vinyl quaternary amine, or a mixture of the same.
Claim 12
Dependent Claim
21 words
A method as described in claim 10 wherein the cationic vinyl monomer is N,N,N-triethylaminomethacrylate or t-butylaminoethylmethacrylate, or mixtures of the same.
Claim 13
Dependent Claim
15 words
A stable gelatinized cationic starch graft copolymer latex produced by the process of claim 1.
Claim 14
Dependent Claim
14 words
A stable gelatinized starch graft copolymer latex produced by the process of claim 8.
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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |