US4012352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyvinyl alcohol microgels
Assignee: EIDP Inc
•
Filing: 1972-06-05
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Granted: 1977-03-15
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Expires: 1992-06-05
Abstract
Abstract Polyvinyl alcohol microgels which comprise stable fluids comprising water and about 0.05 to 10% by weight of polyvinyl alcohol partially crosslinked with tetravalent titanium ions, said microgels being derived from polyvinyl alcohol which has a Hoeppler viscosity of about 4 to 150 centipoises and in which at least about 50 mole percent of the monomeric units are vinyl alcohol units, said partially crosslinked polyvinyl alcohol and water having a Brookfield viscosity of about 1.15 to 2000 centipoises, said viscosity being at least about 15% greater than the viscosity of the aqueous polyvinyl alcohol solution from which the microgel is derived, are useful as sizes for paper and paperboard, in paper and paperboard coatings, as warp sizes for textile fibers, as adhesives, and as soil and dust stabilizers.
Inventors
- 👤 Alden J. Deyrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/10; D21H19/14; D21H19/20; B; B01; B01J; B01J13/00; B01J13/0052; B01J13/0065; D21H17/00; D21H17/71; D21H17/03; D21H17/05; D21H17/06; D21H17/07; D21H17/20; D21H17/33; D21H17/34; D21H17/36; D21H17/63; D21H17/66; D21H17/67; D21H21/00; D21H21/14; D21H21/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
141 words
A solution of polyvinyl alcohol microgel comprising water, 0.05 to 10% by weight of polyvinyl alcohol and 0.2 to 2 parts by weight of tetravalent titanium ion being used per 100 parts by weight of polyvinyl alcohol, said microgel being derived from polyvinyl alcohol which has a Hoeppler viscosity of 4 to 150 centipoises measured as a 4% aqueous solution at 20° C. by the falling ball method, and in which at least 50 mole percent of the monomeric units are vinyl alcohol units, wherein the improvement comprises the polyvinyl alcohol microgel being a stable fluid of polyvinyl alcohol partially crosslinked with tetravalent titanium ions and water, said fluid having a Brookfield viscosity of 15 to 500 centipoises, said Brookfield viscosity being at least 15% greater than the viscosity of the aqueous polyvinyl alcohol solution from which the microgel is derived.
Claim 2
Dependent Claim
141 words
A solution of polyvinyl alcohol microgel comprising water, 0.05 to 10% by weight of polyvinyl alcohol and 0.2 to 2 parts by weight of tetravalent titanium ion being used per 100 parts by weight of polyvinyl alcohol, said microgel being derived from polyvinyl alcohol which has a Hoeppler viscosity of 4 to 150 centipoises measured as a 4% aqueous solution at 20° C. by the falling ball method, and in which at least 50 mole percent of the monomeric units are vinyl alcohol units, wherein the improvement comprises the polyvinyl alcohol microgel being a stable fluid of polyvinyl alcohol partially crosslinked with tetravalent titanium ions and water, said fluid having a Brookfield viscosity of 15 to 500 centipoises, said Brookfield viscosity being at least 15% greater than the viscosity of the aqueous polyvinyl alcohol solution from which the microgel is derived.
Claim 3
Dependent Claim
65 words
The solution of polyvinyl alcohol microgel of claim 1 in which the microgel contains 1 to 8% by weight of partially crosslinked polyvinyl alcohol, the polyvinyl alcohol has a Hoeppler viscosity of 10 to 70 centipoises, at least 85 mole percent of the monomeric units in the polyvinyl alcohol are vinyl alcohol units, and the microgel has a Brookfield viscosity of 25 to 500 centipoises.
Claim 4
Dependent Claim
65 words
The solution of polyvinyl alcohol microgel of claim 2 in which the microgel contains 2 to 6% by weight of partially crosslinked polyvinyl alcohol, 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, and the microgel has a Brookfield viscosity of 30 to 500 centipoises.
Claim 5
Dependent Claim
25 words
The solution of polyvinyl alcohol microgel of claim 3 in which the polyvinyl alcohol is a homopolymer which is at least 99 mole percent hydrolyzed.
Claim 6
Dependent Claim
43 words
The solution of polyvinyl alcohol microgel of claim 3 in which the polyvinyl alcohol is a copolymer derived 94 to 98% by weight from vinyl acetate and 2 to 6% by weight from methyl methacrylate and is at least 99 mole percent hydrolyzed.
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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) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |