Process for preparing low density porous crosslinked polymeric m

Details Process for preparing low density porous crosslinked polymeric m Process for preparing low density porous crosslinked polymeric m

1993-11-29

1994-10-25

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

521 62, 521 63, C08J 928

Patent

active

053589742

ABSTRACT:
In a process for the preparation of a low density porous crosslinked polymeric material by polymerizing a water-in-oil high internal phase emulsion, curing time of the monomers in the emulsion can be reduced without adversely affecting polymer properties by first advancing one or more of the monomers. All or a portion of the monomers are advanced in the presence of an advancement initiator or a free-radical-producing radiation source for about 5% to about 95% of the time effective to form a solid. Then, a water-in-oil high internal phase emulsion is formed with the advanced monomers and optionally additional monomers or the advanced monomers are added to a water-in-oil high internal phase emulsion containing other monomers. The emulsions containing the advanced monomers are cured. The process provides an improved method to incorporate volatile monomers in the porous polymeric material. The curing time is further reduced by carrying out the polymerization and crosslinking in the presence of a alkylperoxycarbonate or a alkylperoxycarboxylate polymerization initiator that is branched at the 1-position and/or the .alpha.-position.

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