Process for producing crosslinked and foamed resin sheet

Details Process for producing crosslinked and foamed resin sheet Process for producing crosslinked and foamed resin sheet

1978-03-14

1980-05-20

Anderson, Philip

Chemistry: electrical and wave energy

Processes and products

Processes of treating materials by wave energy

20415917, 20415924, 264 25, 264 54, 264DIG5, 264DIG18, 521 79, 521 81, 521134, 521140, 521143, 521144, 521145, 521148, B01J 110, B29D 2700

Patent

active

042038154

ABSTRACT:
A process for producing a crosslinked and foamed resin sheet which comprises shaping a resinous mixture comprising a thermoplastic synthetic resin and a heat-decomposable blowing agent into a sheet form, applying a high-energy ionizing radiation to the resulting foamable resin sheet to crosslink the resin sheet, and then heating the resulting crosslinked foamable resin sheet to the decomposition temperature of the blowing agent or to a higher temperature; wherein the high-energy ionizing radiation has a range of at least 0.7 .rho.d g/cm.sup.2 in which d is the thickness in cm of the foamable resin sheet, and .rho. is the density in g/cm.sup.3 of the foamable resin sheet, and a low-energy ionizing radiation with a range of not more than 0.6 .rho.d g/cm.sup.2 in which d and .rho. are as defined is applied to the foamable resin sheet before, during or after the application of the high-energy ionizing radiation.

REFERENCES:
patent: 2952594 (1960-09-01), Rubens
patent: 3098831 (1963-07-01), Carr
patent: 3098832 (1963-07-01), Pooley et al.
patent: 3562367 (1971-02-01), Shinohara et al.
patent: 3840448 (1974-10-01), Osborn et al.

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