Process to prepare two phase foam compositions and two phase foa

Details Process to prepare two phase foam compositions and two phase foa Process to prepare two phase foam compositions and two phase foa

1995-11-17

1997-07-08

Foelak, Morton

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 64, C08J 928

Patent

active

056461933

ABSTRACT:
A process is provided for the production of a porous crosslinked polymeric foam comprising the steps of: (a) providing a first water-in-oil emulsion comprising (i) a first mixture of polymerizable monomers comprising at least one oil-soluble vinyl monomer and from about 2 to about 70 weight percent, based on the mixture, of a multifunctional unsaturated crosslinking monomer, (ii) at least 70 weight percent, based on the emulsion, of water as the internal phase (iii) an effective amount to produce the water-in-oil emulsion of a first surfactant, and (iv) a first polymerization initiator; (b) providing a second water-in-oil emulsion comprising (i) a mixture of polymerizable monomers comprising at least one oil-soluble vinyl monomer and from about 2 to about 70 weight percent, based on the mixture, of a second multifunctional unsaturated crosslinking monomer, (ii) at least 70 weight percent, based on the emulsion, of water as the internal phase (iii) an effective amount to produce the water-in-oil emulsion of a second surfactant, and (iv) a second polymerization initiator; (c) combining the first and second emulsions; and (d) curing said polymerizable monomers under conditions effective to polymerize and crosslink the polymer prior to significant diffusion between the emulsions. Polymeric foams can be prepared by this process that exhibit positive attributes of foams formed by curing of each of the emulsions individually.

REFERENCES:
patent: 4522953 (1985-06-01), Barby et al.
patent: 5037859 (1991-08-01), Williams, Jr. et al.
patent: 5061767 (1991-10-01), Ruckenstein et al.
patent: 5149720 (1992-09-01), DesMarais et al.
patent: 5189070 (1993-02-01), Brownscombe et al.
patent: 5210104 (1993-05-01), Bass et al.

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