Process for the manufacture of foamed structures

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

C - Chemistry, Metallurgy

08

K

403/28, 403/77,

C08K 3/36 (2006.01) C08J 9/00 (2006.01) C08L 101/00 (2006.01)

Patent

CA 1188048

Abstract of the Disclosure An improvement in a process for the production of polyurethane foam in which a first component is admixed 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 non-uniform distribution of the cells of the foam, is disclosed. The improvement com- prises 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 obtain- ed has a substantially uniform distribution of cells. A pro- cess for the production of a foamed thermoplastic structure in which at least part of the normally liquid chlorofluoro- carbon 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 is also disclosed. The composition is in the form of a dry free-flowing powder.

395568

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