Biaxially oriented polyoxymethylene film

Details Biaxially oriented polyoxymethylene film Biaxially oriented polyoxymethylene film

1988-07-20

1990-08-07

Kight, III, John

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528246, 528248, 528250, 528270, 525472, 428910, 2642107, 2642902, C08G 224

Patent

active

049469304

ABSTRACT:
There is disclosed a biaxially oriented film formed of film forming composition comprising a polyoxymethylene polymer in which the major constituent of the main chains of said polymer each of consists substantially of repeating units of oxymethylene group --CH.sub.2 --O--, said film being characterized in that, when said film is remelted at a temperature above the melting point of said film and the resulting melt is recrystallized isothermally at 140.degree. C. into a solid in film form, the number of polyoxymethylene spherulites in the crystal structure at the surface of the resulting film would be at least 50 per 0.1 mm.sup.2 area of the resulting film surface, as measured with a polarizing microscope through cross-polarizers, and a process for manufacturing the same.

REFERENCES:
patent: 4835245 (1989-05-01), Takasa et al.
CA109(26):232481e, "Dimensionally Stable Biaxially Stretched Polyoxymethylene Films".
CA106(16):121079y, "Rigid Polyoxymethylene Films".
WPI Acc. No.: 89-134886/18, "Biaxially Stretched Polyoxymethylene Films Containing Mixtures of Polyoxymethylene Homo-- and Co--polymers".
WPI Acc. No.: 89-025664/04, "Biaxially Oriented Polyoxymethylene Film".

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