Ultramicrocellular structures of crystalline organic polymer

Claim 1

AN ULTRAMICROCELLULAR STRUCTURE OF A SYNTHETIC LINEAR CRYSTALLINE ORGANIC POLYMER OF FILM-FORMING MOLECULAR WEIGHT, SUBSTANTIALLY ALL OF SAID POLYMER BEING PRESENT AS FILMY WALLS OF GENERALLY POLYHEDRAL SHAPED CELLS, INDIVIDUAL FILMY WALLS BEING LESS THAN 2 MICRONS IN THICKNESS AND EXHIBITING UNIFORM TEXTURE AS INDICATED BY HAVING OVER THE WHOLE AREA OF THE CELL WALL A SUBSTANTIALLY UNIFORM THICKNESS AND DENSITY AS DETERMINED INTERFEROMETRICALLY AT A RESOLUTION OF 1/2 MICRON AND A UNIFORM POLYMER ORIENTATION AS EVIDENCED BY UNIFORM EXTINCTION IN A BIREFRINGENCE TEST AT A RESOLUTION OF 1/2 MICRON, THE CRYSTALLITES OF SAID POLYMER IN INDIVIDUAL FILMY WALLS EXHIBITING UNIPLANAR ORIENTATION WITH REFERENCE TO THE SURFACE OF THE FILMY WALL AS INDICATED BY THE APPEARANCE OF AT LEAST ONE OF THE EQUATORIAL DIFFRACTIONS OF THE WALL LESS THAN ONE-HALF ITS NORMAL RELATIVE INTENSITY WHEN COMPARED TO A RANDOMLY ORIENTED SAMPLE OF THE SAME POLYMER.