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US 5,306,733 AGranted
Low density porous crosslinked polymeric materials
AssigneeShell Oil Company
InventorsRobert P. Adamski, Maryanne Mores, Pui K. Wong, Diana D. Davis
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Abstract
Stable high internal phase water-in-oil emulsions containing polymerizable vinyl monomers, crosslinking monomers and polymerization initiators are obtained by using saccharide fatty acid esters as surfactants. The amount of surfactants necessary to form stable high internal phase water-in-oil emulsions is decreased by using saccharide fatty acid esters as surfactants. Further, hydrophobic foams can be obtained by using saccharide fatty acid esters.
Claims13
A process for the production of a porous crosslinked polymeric material comprising the steps of:
- (a) providing a water-in-oil emulsion comprising (i) a mixture of polymerizable monomers comprising at least one vinyl monomer and from about 2 to about 70 weight percent, based on the mixture, of a multifunctional unsaturated crosslinking monomer, (ii) at least 90 weight percent, based on the emulsion, of water as the internal phase, (iii) an effective amount of a surfactant comprising at least one saccharide fatty acid ester to produce the water-in-oil emulsion, and (iv) an effective amount of at least one polymerization initiator to polymerize and crosslink the polymerizable monomers;
- (b) heating the water-in-oil emulsion under conditions effective to polymerize and crosslink the polymerizable monomers;
- and
- (c) removing at least a portion of the water in said crosslinked emulsion.
1 more element
Dependencies are inferred from the claim text.