Process for the manufacture of foamed structures

Details Process for the manufacture of foamed structures Process for the manufacture of foamed structures

1982-02-03

1983-10-04

Cockeram, H. S.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 79, 521 91, 521131, 521144, 252182, C08G 1814, C08G 1800

Patent

active

044079826

ABSTRACT:
An improvement in a process for the production of polyurethane foam is disclosed, in which a first component is admixed and reacted with a second component and in which the first component has a viscosity at least two times the viscosity of the second component, thereby resulting in a nonuniform distribution of the cells of the foam. The improvement comprises admixing the second component with 1-5%, by weight, of the second component, of fumed silica prior to admixing the first and second components. The amount of fumed silica is controlled so that the polyurethane foam subsequently obtained has a substantially uniform distribution of cells. A process for the production of a foamed thermoplastic structure is also disclosed in which at least part of the normally liquid chlorofluorocarbon blowing agent is added as a composition comprising an admixture of 5-99%, by weight, of fumed silica and 1-95%, by weight, of a normally liquid chlorofluorocarbon adsorbed thereon. The composition is in the form of a dry free-flowing powder.

REFERENCES:
patent: 3072582 (1963-01-01), Frost
patent: 4048208 (1977-09-01), Spicuzza et al.
patent: 4101467 (1978-07-01), Park et al.
patent: 4217422 (1980-08-01), Wasilczyk
patent: 4275172 (1981-06-01), Barth et al.
patent: 4278770 (1981-07-01), Chandalia et al.
patent: 4293657 (1981-10-01), Nissen et al.
patent: 4317888 (1982-03-01), Watanabe et al.

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