EP0060138A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Low density porous cross-linked polymeric materials and their preparation
Assignee: Unilever PLC
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Filing: 1982-03-09
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Granted: —
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Expires: 2002-03-09
Abstract
Abstract Cross-linked homogenous porous polymeric materials are prepared by polymerisation 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
EP
Data Source
google_patents
Last Synchronized
2026-10-23 11:46
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/28; C08J9/283; Y; Y10; Y10S; Y10S264/00; Y10S264/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
49 words
A porous homogeneous cross-linked 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
49 words
A porous homogeneous cross-linked 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
27 words
A porous homogenous cross-linked polymeric block material as claimed in claim 1 or claim 2 and containing, . included in the pores, an aqueous or non-aqueous liquid.
Claim 5
Dependent Claim
33 words
A porous homogenous cross-linked polymeric block material as claimed in any one of the preceding claims 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
73 words
A process for the preparation of the homogenous porous cross-linked polymeric block material in which the monomers are polymerised in the form of a 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 and from 0.0005 to 10% by weight of the monomers of a polymerisation catalyst.
Claim 8
Dependent Claim
73 words
A process for the preparation of the homogenous porous cross-linked polymeric block material in which the monomers are polymerised in the form of a 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 and from 0.0005 to 10% by weight of the monomers of a polymerisation catalyst.
Claim 9
Dependent Claim
34 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 or claim 2.
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.
Claim 12
Dependent Claim
19 words
A process as claimed in claim 6, in which the surfactant has an HLB value in the range 2-6.
References Cited (Backward Citations)
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