Low-density microcellular foam and method of making same

Details Low-density microcellular foam and method of making same Low-density microcellular foam and method of making same

1975-09-02

1977-03-15

Morris, Theodore

Compositions: coating or plastic

Coating or plastic compositions

Pore forming

106196, C08L 112

Patent

active

040122654

ABSTRACT:
Low-density microcellular foam having a cell size of not greater than 2 .mu.m and method of making by dissolving cellulose acetate in an acetone-based solvent, gelling the solution in a water bath maintained at 0.degree.-10.degree. C for a selected period of time to allow impurities to diffuse out, freezing the gel, and then freeze-drying wherein water and solvents sublime and the gel structure solidifies into low-density microcellular foam. The foam has a density of 0.065 to 0.6.times.10.sup.3 kg/m.sup.3 and cell size of about 0.3 to 2 .mu.m. The small cell size foam is particularly applicable for encapsulation of laser targets.

REFERENCES:
patent: 3261704 (1966-07-01), Stieg
patent: 3428584 (1969-02-01), Riley
patent: 3819390 (1974-06-01), Teng
patent: 3849350 (1974-11-01), Matsko

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