×

Aromatic polyamide-type films

  • US 3,966,686 A
  • Filed: 12/24/1974
  • Issued: 06/29/1976
  • Est. Priority Date: 12/28/1973
  • Status: Expired due to Term
First Claim
Patent Images

1. An aromatic polyamide-type film, substantially consisting of a member of the group consisting of at least one of p-benzamide, p-phenylene terephthalamide and terephthaloyl hydrazide recurring units as essential chain constituents, which constituents comprise at least about 70 mol % of the entire film, and which have an inherent viscosity of more than 1.0 at 25°

  • C, a density of more than 1.41 g/cm3 at 25°

    C and 0% relative humidity and a planar orientation coefficient of larger than 0.65, obtained by the X-ray pole figure method, said film being substantially free of organic solvent and inorganic ionic compounds, and having been prepared by heating to the polymer crystallization temperatures while preventing free shrinkage in the machine direction and in the transverse direction.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×