Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Cellular products or processes of preparing a cellular...
Patent
1985-10-08
1987-06-16
Foelak, Morton
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Cellular products or processes of preparing a cellular...
21050028, 264 28, 264 49, 264101, 521 61, 521146, C08U 926, C08V 928
Patent
active
046736956
ABSTRACT:
Low density, microporous polymer foams are provided by a process which comprises forming a solution of polymer and a suitable solvent followed by rapid cooling of the solution to form a phase-separated system and freeze the phase-separated system. The phase-separated system comprises a polymer phase and a solvent phase, each of which is substantially continuous within the other. The morphology of the polymer phase prior to and subsequent to freezing determine the morphology of the resultant foam.
Both isotropic and anisotropic foams can be produced. If isotropic foams are produced, the polymer and solvent are tailored such that the solution spontaneously phase-separates prior to the point at which any component freezes. The morphology of the resultant polymer phase determines the morphology of the resultant foam and the morphology of the polymer phase is retained by cooling the system at a rate sufficient to freeze one or both components of the system before a change in morphology can occur. Anisotropic foams are produced by forming a solution of polymer and solvent that will not phase separate prior to freezing of one or both components of the solution. In such a process, the solvent typically freezes before phase separation occurs. The morphology of the resultant frozen two-phase system determines the morphology of the resultant foam.
The process involves subjecting the solution to essentially one-dimensional cooling. Means for subjecting such a solvent to one-dimensional cooling are also provided.
Foams having a density of less than 0.1 g/cc and a uniform cell size of less than 10 .mu.m and a volume such that the foams have a length greater than 1 cm are provided.
REFERENCES:
patent: 3308073 (1967-03-01), Kepple
patent: 3403046 (1968-09-01), Schwacke, Jr. et al.
patent: 3812224 (1974-05-01), Smith et al.
patent: 3839516 (1974-10-01), Williams et al.
patent: 4118449 (1978-10-01), Riude
patent: 4247498 (1981-01-01), Castro
patent: 4430451 (1984-02-01), Young et al.
patent: 4432920 (1984-02-01), Ishikawa et al.
patent: 4519909 (1985-05-01), Castro
Aubert James H.
Clough Roger L.
Curro John G.
Quintana Carlos A.
Russick Edward M.
Foelak Morton
Hightower Judson R.
McMillan Armand
Sopp Albert
The United States of America as represented by the United States
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