Use of solvent mixtures in making foamable compositions

Details Use of solvent mixtures in making foamable compositions Use of solvent mixtures in making foamable compositions

1974-09-06

1976-05-25

Tillman, Murray

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

106122, 106196, 260 25B, 260 25F, 260 25H, 260 25N, 260 25R, 260 25AK, 260 25BE, 260 25HA, 260 25HB, 260 304A, 260 304R, 260 332R, 260 336UA, 260 338R, 260 338UA, 260 338UB, C08J 916, C08K 501, C08K 502, C08K 515

Patent

active

039591972

ABSTRACT:
A process for rapidly producing a substantially uniform, solid, cellular thermoplastic article comprising the steps of: (a) charging a vessel with (1) a solid thermoplastic polymer, (2) a solvent mixture the amount of which in the range of from about 25-50% by weight of said polymer boils at or below 0.degree.C. and to prevent shrinkage the minor amount of which in the range of from about 3-30% by weight of said polymer boils at or near 20.degree.C., said solvent mixture being capable of forming a gel with the polymer when subjected to super-atmospheric pressure, (3) water in sufficient amount to lubricate the flow of the gel from the vessel as specified in step (c) below, and (4) for homogeneous polymer solutions a nucleating agent selected from the group consisting of spherical polyethylene powder, glass hollow spheres, phenolic hollow spheres and mixtures thereof; (b) subjecting the contents of the vessel to super-atmospheric pressure at a temperature in the range of room temperature to below the critical temperature of said solvent mixture for a time sufficient to form a flowable gel; and, (c) thereafter rapidly opening an outlet at the bottom of the vessel to cause the gel to flow from the vessel and form the cellular article. Foamable compositions usable in the process to make the cellular articles are described. Major means more than 50% by weight of the solvent mixture and minor means less than 50% by weight of the solvent mixture as the terms imply.

REFERENCES:
patent: 2354260 (1944-07-01), Haney et al.
patent: 2450436 (1948-10-01), McIntire
patent: 2978340 (1961-04-01), Veatch et al.
patent: 3442828 (1969-05-01), Engelhardt et al.
patent: 3632703 (1972-01-01), Sullivan et al.
patent: 3644230 (1972-02-01), Cronin
patent: 3657165 (1972-04-01), Kawai et a.
"Evaluation of Four Foaming Techniques", Salyer et al., Journal of Cellular Plastics, Vol. 4, No. 9, Sept. 1968, pp. 1-12.

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