Process for preparing molded microcellular elastomers

Details Process for preparing molded microcellular elastomers Process for preparing molded microcellular elastomers

1985-12-17

1988-11-08

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

By mechanically introducing gas into material

2643286, 264DIG13, 264DIG83, 422133, 425 4R, 425543, C08J 930, C08G 1814, B29B 704, B29C 4500

Patent

active

047832959

ABSTRACT:
An improved process for producing a molded microcellular elastomer with a reduced number of voids from at least two liquid reactants and a gas, which process comprises introducing into at least one reactant a gas to form an admixture; passing the admixture through a static mixer at superatmospheric pressure; then immediately mixing the admixture with the other reactant at superatmospheric pressure to form a reaction mixture; introducing the reaction mixture into a mold in which the pressure is substantially below the superatmospheric pressures used above; and curing the reaction mixture in the mold to produce a molded microcellular elastomer with a reduced number of large voids.

REFERENCES:
patent: 3882052 (1975-05-01), Raynor et al.
patent: 4059714 (1977-12-01), Scholl et al.
patent: 4156650 (1979-05-01), Garrett
patent: 4157427 (1979-06-01), Ferber
patent: 4288564 (1981-09-01), Conover
patent: 4396729 (1983-08-01), Dominquez et al.
patent: 4548778 (1985-10-01), Holdredge, Jr.

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