Laminates of polyethylene foam with an anisotropic pore structur

Details Laminates of polyethylene foam with an anisotropic pore structur Laminates of polyethylene foam with an anisotropic pore structur

1976-02-17

1977-10-11

Whitby, Edward G.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156244, 260 25HA, 264 455, 264 459, 264171, 264DIG18, 428218, 428305, 428315, B32B 520

Patent

active

040533417

ABSTRACT:
A process for the production of cross-linked polyethylene foam layers which have an anisotropic pore structure in at least one internal layer, wherein at least three polyethylene sheets which contain equal quantities of peroxide as cross-linking agent and differing quantities of a chemical blowing agent are arranged as a multilayer structure in such a way that the two external layers are formed by the sheets which contain a smaller proportion of blowing agent, and the structure is heated, preferably in a continuous heating furnace, so that the individual sheets are cross-linked and at the same time welded together to form a laminate which is subsequently foamed by increasing the temperature to between 190.degree. and 250.degree. C.

REFERENCES:
patent: 3463687 (1969-08-01), Folsom et al.
patent: 3608006 (1971-09-01), Hosoda et al.
patent: 3936565 (1976-02-01), Good
patent: 3954537 (1976-05-01), Alfter et al.
patent: 3968292 (1976-07-01), Pearman et al.

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