Method of making a cellulose acetate low density microcellular f

Details Method of making a cellulose acetate low density microcellular f Method of making a cellulose acetate low density microcellular f

1976-12-09

1978-10-03

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

With step of cooling to a temperature of zero degrees c. or...

106122, 264 41, 264200, B29D 2700

Patent

active

041184491

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 0-10.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 adaptable for encapsulation of laser targets.

REFERENCES:
patent: 3428584 (1969-02-01), Riley
patent: 4021280 (1977-05-01), Rinde et al.

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