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

1992-05-29

1993-02-23

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, 521146, 521150, 521149, C08J 928

Patent

active

051890704

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 or substantially affecting the emulsion by carrying out the curing in multiple-stages. The emulsion is first pre-cured at a temperature less than about 65.degree. C. until the emulsion reaches a Rheometrics dymanic shear modulus of at least about 500 and subsequently curing at a temperature above about 70.degree. C.

REFERENCES:
patent: 4522953 (1985-06-01), Barby et al.
patent: 4688709 (1987-05-01), Jones et al.
patent: 4788225 (1988-11-01), Edwards et al.
patent: 5037859 (1991-08-01), Williams et al.
Winter, H. H., Can the Gel Point of a Cross-Linking Polymer be Detected by the G'-G" Crossover?; Polymer Eng. and Sci., Dec. 1987, vol. 27, No. 22.
Encyclopedia of Polymer Science and Engineering, Supplement Volume, Second Edition, Copyright 1989; John Wiley & Sons, Inc., pp. 343-351.

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