US3941730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol microgel precursor blends
Assignee: EIDP Inc
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Filing: 1974-07-09
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Granted: 1976-03-02
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Expires: 1994-07-09
Abstract
Abstract Stable, fluid polyvinyl alcohol-containing microgels in water having a Brookfield viscosity of 1.15 to 1000 centipoises may be prepared more economically from a dry blend which comprises (A) a polymer mixture consisting of at least about 0.5% by weight of polyvinyl alcohol and one or more polysaccharide selected from the group consisting of up to about 99.5% by weight of starch and up to about 33% by weight of sodium carboxymethylcellulose, said polyvinyl alcohol having a Hoeppler viscosity of about 4 to 150 centipoises and having at least about 50 mole percent of the monomeric units present as vinyl alcohol units, (B) water-soluble, solid titanium salt of a hydroxy carboxylic acid of 2 to 10 carbon atoms in an amount which provides about 0.05 to 10 parts by weight of tetravalent titanium ions per 100 parts of polymer mixture, and (C) about 0.05 to 20 parts by weight of water-soluble, solid hydroxy carboxylic acid of 2 to 10 carbon atoms per 100 parts of polymer mixture.
Inventors
- 👤 John Carl Solenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:30
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/63; D21H17/67; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0065; C; C08; C08K; C08K5/00; C08K5/04; C08K5/05; C08K5/09; C08K5/098; C08L; C08L1/00; C08L1/08; C08L1/26; C08L29/00; C08L29/02; C08L29/04; C08L3/00; C08L3/02; D21H17/03; D21H17/05; D21H17/14; D21H17/20; D21H17/21; D21H17/24; D21H17/33; D21H17/34; D21H17/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
177 words
A dry blend for forming a stable, fluid polyvinyl alcohol containing microgel in water having a Brookfield viscosity of 1.15 to 1000 centipoises which comprises (A) a polymer mixture consisting of at least about 0.5 percent by weight of polyvinyl alcohol and one or more polysaccharide selected from the group consisting of up to 99.5 percent by weight of starch and up to 33 percent by weight of sodium carboxymethylcellulose, said polyvinyl alcohol having a Hoeppler viscosity of 4 to 150 centipoises measured as a 4 percent aqueous solution at 20°C. by the falling ball method and having at least 50 mole percent of the monomeric units present as vinyl alcohol units, (B) water-soluble, solid titanium salt of a hydroxy carboxylic acid of 2 to 10 carbon atoms in an amount which provides 0.05 to 10 parts by weight of tetravalent titanium ion per 100 parts of said polymer mixture, and (C) 0.05 to 20 parts by weight of water-soluble, solid hydroxy carboxylic acid of 2 to 10 carbon atoms per 100 parts of said polymer mixture.
Claim 2
Dependent Claim
177 words
A dry blend for forming a stable, fluid polyvinyl alcohol containing microgel in water having a Brookfield viscosity of 1.15 to 1000 centipoises which comprises (A) a polymer mixture consisting of at least about 0.5 percent by weight of polyvinyl alcohol and one or more polysaccharide selected from the group consisting of up to 99.5 percent by weight of starch and up to 33 percent by weight of sodium carboxymethylcellulose, said polyvinyl alcohol having a Hoeppler viscosity of 4 to 150 centipoises measured as a 4 percent aqueous solution at 20°C. by the falling ball method and having at least 50 mole percent of the monomeric units present as vinyl alcohol units, (B) water-soluble, solid titanium salt of a hydroxy carboxylic acid of 2 to 10 carbon atoms in an amount which provides 0.05 to 10 parts by weight of tetravalent titanium ion per 100 parts of said polymer mixture, and (C) 0.05 to 20 parts by weight of water-soluble, solid hydroxy carboxylic acid of 2 to 10 carbon atoms per 100 parts of said polymer mixture.
Claim 3
Dependent Claim
38 words
The dry blend of claim 1 in which the polyvinyl alcohol has a Hoeppler viscosity of 10 to 70 centipoises and at least 85 mole percent of the monomeric units in the polyvinyl alcohol are vinyl alcohol units.
Claim 4
Dependent Claim
86 words
The dry blend of claim 2 in which the polyvinyl alcohol has a Hoeppler viscosity of 20 to 40 centipoises, at least 93 mole percent of the monomeric units in the polyvinyl alcohol are vinyl alcohol units, the titanium salt is present in an amount which provides 0.1 to 2 parts by weight of tetravalent titanium ions per 100 parts of polymer mixture, and the hydroxy carboxylic acid is present in the amount of 0.2 to 10 parts by weight per 100 parts of polymer mixture.
Claim 5
Dependent Claim
22 words
The dry blend of claim 3 in which the polyvinyl alcohol is a homopolymer which is at least 99 mole percent hydrolyzed.
Claim 6
Dependent Claim
22 words
The dry blend of claim 4 in which the titanium salt is titanium citrate and the hydroxy carboxylic acid is citric acid.
Claim 7
Dependent Claim
39 words
The dry blend of claim 5 in which the polymer mixture contains 5 to 40 percent by weight of polyvinyl alcohol, 60 to 95 percent by weight of starch, and 0 to 10 percent by weight of sodium carboxymethylcellulose.
Claim 8
Dependent Claim
31 words
The dry blend of claim 5 in which the polymer mixture contains 67 to 95 percent by weight of polyvinyl alcohol and 5 to 33 percent by weight of sodium carboxymethylcellulose.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |