Foamed liquid crystal polymer film/sheet having improved flexibi

Details Foamed liquid crystal polymer film/sheet having improved flexibi Foamed liquid crystal polymer film/sheet having improved flexibi

1991-01-17

1993-05-11

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, 264 54, 521 79, 521 81, 521 82, 521 92, 521 97, 521 98, C08J 908, C08J 912

Patent

active

052101070

ABSTRACT:
A flexible foamed liquid crystal polymer film or sheet having uniformly small cells or bubbles. The foam cells are essentially spherical and have mean diameters less than or equal to approximately 250 microns. The cell size distribution is relatively small. The foamed sheet is made by extruding the polymer through a die under pressure at a temperature near or below the polymer's melting point; a gas or chemical blowing agent is extruded with the polymer to produce foaming as the polymer exits the die.

REFERENCES:
patent: 4224264 (1980-09-01), Ort et al.
patent: 4312960 (1982-01-01), Ort et al.
patent: 4429060 (1984-01-01), Ide
patent: 4462947 (1984-07-01), Huggard
patent: 4473665 (1984-09-01), Martini-Vivedensky
patent: 4588754 (1986-05-01), Lisa

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