Low density porous cross-linked polymeric materials and their preparation and use as carriers for included liquids
AssigneeLever Brothers Company
InventorsDonald Barby, Zia Haq
Life of this patent
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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.
Claims9
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.
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.
Dependencies are inferred from the claim text.