Insulating alkenyl aromatic polymer foam

Details Insulating alkenyl aromatic polymer foam Insulating alkenyl aromatic polymer foam

1989-08-22

1990-04-10

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

264 53, 521 79, 521146, 521147, C08J 914

Patent

active

049161660

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 1,1-difluoro-1-chloroethane as a blowing agent. These foam bodies have an average cell size of 0.05 to 2.0 millimeters, 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 perm inch, a density not exceeding 2.4 pounds per cubic foot, and an absolute dimensional stability of less than 4 percent in any direction when measured by the test designated ASTM D2126/C578. Also disclosed is a method for preparing such foam bodies, other alkenyl aromatic thermoplastic synthetic resinous elongate foam bodies having the same criteria, except a density from 2.4 to 5.0 pounds per cubic foot and a method for preparing such greater density foam bodies.

REFERENCES:
patent: 3960792 (1976-06-01), Nakamura
patent: 4438224 (1984-03-01), Suh
patent: 4636527 (1987-01-01), Suh

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