Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1991-11-15
1992-07-07
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
521 56, 521149, 521150, 521 64, C08J 920
Patent
active
051283824
ABSTRACT:
Supercritical drying has distinct advantages in generating microcellular materials. The dimensional stability of the polymer is not affected on drying because the supercritical process does not go through the two phase path and therefore the effect of capillary forces is absent. This helps in maintaining the morphology of the final polymer structure and better control over cell size.
Organic microcellular foams were prepared by polymerizing directly in a near-critical fluid and pursuing the supercritical drying in the same reactor. The critical variables are the choice of a diluent with a strong enough solvent power to stabilize the polymer matrix, but with a low enough critical temperature to permit critical point drying without damage to the polymer matrix.
REFERENCES:
patent: 4873218 (1991-10-01), Pekala
patent: 4997804 (1991-03-01), Pekala
Aubert, Sylwester--"Microcellular Foams? For What?"Chemtech--Apr. 1991 pp. 234-238.
Teichner--"Aerogels"--Chemtech--Jun. 1991 pp. 373-377.
Elliott--"Microcellular methacrylates . . . " Polymer Communications--1991 vol. 32, pp. 10-12.
Gokul Srinivasan--J. Richard Elliott, Jr. "Microcellular Materials via Polymerization in Supercriticl Fluids", Nov. 15, 1990 pp. 1-22 prepared for 1990 Aiche National Meeting, Chicago, Ill.
Akhaury Ranjan
Dhanuka Manish
Elliott, Jr. Jarrell R.
Srinivasan Gokul
Foelak Morton
The University of Akron
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