Foam and process for producing same

Details Foam and process for producing same Foam and process for producing same

1985-04-10

1986-02-11

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 54, 521 79, 521 81, 521 94, 521143, C08J 900

Patent

active

045699500

ABSTRACT:
A novel foam composed of closed cells having a specific tensile strength of 150 kg/cm.sup.2 or more, a compression recovery of 80% or more and a heat shrinkage of 50% or less, a variation in thickness of foam of less than 50%, a corrugation value of less than 100% and a surface smoothness of less than 2 mm, an average cell diameter of 0.05-3 mm, said foam having a foam density of 0.007-0.10 g/cm.sup.3, a variation in thickness of cell wall film of .+-.30% or less and a variation factor of cell diameter of 70% or less, obtained by foaming a composition consisting essentially of 100 parts by weight of a substantially non-crosslinked polyethylene having a density of 0.935 g/cm.sup.3 or more and a melting point of 117.degree. C. or more, 0.05-10 parts by weight of a foaming decelerant having the capability of prolonging the foaming time by at least one second as compared with the absence of the foaming decelerant, as measured by a glass tube blowing test method, and 0.001-5 parts by weight of a nucleating agent. The resulting foam has excellent mechanical properties and heat-resistance and has a good appearance.

REFERENCES:
patent: 2956960 (1960-10-01), Nemphos
patent: 3102865 (1963-09-01), Sneary et al.
patent: 4214054 (1980-07-01), Watanabe et al.
patent: 4275168 (1979-07-01), Watanabe
patent: 4343913 (1982-08-01), Watanabe et al.

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