Cellulose acetate foams
AssigneeEastman Chemical Company
InventorsBETHANY MICHELLE ADEN, GAURAV AMARPURI, GOLIATH BENIAH, STEPHANIE KAY CLENDENNEN, MICHAEL EUGENE DONELSON, Yichen Fang, THILANGA PRABHASH LIYANA ARACHCHI, STEVEN THOMAS PERRI, WAYNE KEN SHIH
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Abstract
A cellulose acetate foam having a density of less than 0.20 g/cm3 and an average foam cell size of less than 200 micrometers is disclosed. A foamable composition, a method for foaming a foam and articles including, prepared or formed from the foam are also described.
Claims20
A cellulose acetate foam, wherein the foam has a density of less than 0.20 g/cm3 and an average foam cell size of less than 200 micrometers.
A method for forming a foam, the method comprising:
- (a) forming a melt of a melt-processable composition, said melt-processable composition including (1) a cellulose acetate;
- (2) a processing aid;
- and (3) a nucleating agent;
- (b) adding physical blowing agent to said melt to form a foamable melt;
- and
- (c) thermally expanding said foamable melt under conditions sufficient to form a foam therefrom, wherein said wherein said conditions include a melt temperature of from 120° C. to 210° C. and a thermal expansion pressure of from 20 to 250 bar.
Dependencies are inferred from the claim text.