Patent US4522953A successfully refreshed from Google Patents.
US4522953A
Expired / Lapsed
US
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Low density porous cross-linked polymeric materials and their preparation and use as carriers for included liquids
Assignee: Lever Brothers Co
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Filing: 1984-09-24
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Granted: 1985-06-11
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Expires: 2004-09-24
Abstract
Abstract Cross-linked homogenous porous polymeric materials are prepared by polymerization of monomers as the continuous phase in a high internal phase emulsion having above a critical limit of surfactant to ensure adequate absorbtivity. The porous materials may be dried and refilled with selected liquids and act as a high capacity reservoir.
Inventors
- 👤 Donald Barby
- 👤 Zia Haq
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; Y; Y10; Y10S; Y10S264/00; Y10S264/18
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A porous homogeneous cross-linked vinyl polymeric block material formed from a water-in-oil emulsion, said emulsion containing at least 90% by weight water, the polymeric block material having a dry density of less than 0.1 g/cc and formed as a cross-linked porous structure having a pore volume of more than 9 cc/g and an absorbency for hydrophobic liquids defined in terms of oleic acid of at least 7 cc/g.
Claim 2
Dependent Claim
68 words
A porous homogeneous cross-linked vinyl polymeric block material formed from a water-in-oil emulsion, said emulsion containing at least 90% by weight water, the polymeric block material having a dry density of less than 0.1 g/cc and formed as a cross-linked porous structure having a pore volume of more than 9 cc/g and an absorbency for hydrophobic liquids defined in terms of oleic acid of at least 7 cc/g.
Claim 3
Dependent Claim
21 words
A porous homogenous cross-linked polymeric block material as claimed in claim 1 having a dry density from 0.02 to 0.08 cc/g.
Claim 4
Dependent Claim
23 words
A porous homogenous cross-linked polymeric block material as claimed in claim 1 and containing, included in the pores, an aqueous or non-aqueous liquid.
Claim 5
Dependent Claim
29 words
A porous homogenous cross-linked polymeric block material as claimed in claim 1 capable of retaining at least 25 times its own weight of liquid defined in terms of water.
Claim 6
Dependent Claim
29 words
A porous homogeneous cross-linked polymeric block material as claimed in claim 4, capable of retaining at least 40 times its own weight of liquid defined in terms of water.
Claim 7
Dependent Claim
95 words
A process for the preparation of the homogeneous porous cross-linked polymeric block material in which the monomers are vinyl polymerised in the form of a water-in-oil high internal phase emulsion comprising, as the internal phase, at least, 90% by weight of the emulsion of water; the remainder of polymerisable monomers and from 5-30% by weight of the monomers of a surfactant with HLB value in the range 2-6 selected from the group consisting of anionic, nonionic, cationic types and mixtures thereof, and from 0.005 to 10% by weight of the monomers of a polymerisation catalyst.
Claim 8
Dependent Claim
95 words
A process for the preparation of the homogeneous porous cross-linked polymeric block material in which the monomers are vinyl polymerised in the form of a water-in-oil high internal phase emulsion comprising, as the internal phase, at least, 90% by weight of the emulsion of water; the remainder of polymerisable monomers and from 5-30% by weight of the monomers of a surfactant with HLB value in the range 2-6 selected from the group consisting of anionic, nonionic, cationic types and mixtures thereof, and from 0.005 to 10% by weight of the monomers of a polymerisation catalyst.
Claim 9
Dependent Claim
31 words
A process as claimed in claim 6, in which the block material, having included water in its pores, is carefully dried to produce a dry polymer as claimed in claim 1.
Claim 10
Dependent Claim
27 words
A process as claimed in claim 6, in which the polymer, having included water in its pores, is exchanged with an aqueous solution or a non-aqueous liquid.
Claim 11
Dependent Claim
20 words
A process as claimed in claim 6, in which the water in the internal phase also contains a useful solute.
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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) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |