Directional flexibilization of expanded thermoplastic foam sheet

Details Directional flexibilization of expanded thermoplastic foam sheet Directional flexibilization of expanded thermoplastic foam sheet

1982-04-09

1985-04-09

Anderson, Philip E.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264321, 264DIG4, 264DIG15, 521144, 521145, 521149, 521189, B29D 2700

Patent

active

045102686

ABSTRACT:
Flexibilized, rigid plastic foam sheets with improved properties particularly desirable for low temperature and cryogenic insulation can be prepared by mechanical compression of freshly expanded closed-cell thermoplastic foams. Thus an extruded foam sheet having a density of 20-100 kg/m.sup.3, a y-axial size size of 0.05 to 1.00 mm and a Y-axial compressive strength of at least 1.8 kg/cm.sup.2 is flexibilized with 0.25 to 240 hours of expansion to give a flexibilized foam with improved elongation, workability, crack resistance and water vapor barrier properties.

REFERENCES:
patent: 3159700 (1964-12-01), Nakamura
patent: 3191224 (1965-06-01), Nakamura
patent: 3206899 (1965-09-01), Wright
patent: 3244346 (1966-04-01), Tijunelis
patent: 3300558 (1967-01-01), Grant et al.
patent: 3384531 (1968-05-01), Parrish
patent: 4017346 (1977-04-01), Smith
patent: 4299883 (1981-11-01), Roth et al.
patent: 4338072 (1982-07-01), Milford et al.

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