Insulating alkenyl aromatic polymer foam

Details Insulating alkenyl aromatic polymer foam Insulating alkenyl aromatic polymer foam

1989-11-08

1991-04-30

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

4283148, 428398, 521 79, 521 81, 521 98, 521146, C08J 908

Patent

active

050118668

ABSTRACT:
Alkenyl aromatic thermoplastic synthetic resinous elongate foam bodies having a machine direction, a traverse direction and closed noninterconnecting gas-containing cells are prepared using at least 70 percent by weight of 1,1,1-trifluoroethane and or 1,1,1,2-tetrafluoroethane as a blowing agent or part of a blowing agent mixture. These foam bodies have an average cell size of 0.01 to 0.3 millimeters, a density of from about 0.75 to about 6.0 pounds per cubic foot, an absolute dimensional stability of less than 4 percent in any direction when measured by the test designated ASTM D2126/C578, and preferably a minimum cross-sectional dimension of at least 0.25 inch, a cross-sectional area of at least 8 square inches, a water vapor permeability not greater than 1.8 per inch.
A cell size enlarger agent may be necessary for cell sizes in the 0.2-0.3 range.

REFERENCES:
patent: 4387169 (1983-06-01), Zabrocki et al.
patent: 4931484 (1990-06-01), Hovis

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