Slippery biaxially stretched polyester films

Abstract

Abstract A process for producing a slippery biaxially stretched polyester film, which comprises coating one or both surfaces, preferably one surface, of a running polyester film, before the completion of its crystalline orientation, with an aqueous solution or dispersion containing (A) a metal salt having the composition of the following formula ##STR1## wherein Me represents a metal ion having a valence of 2 to 6, R is H or CH 3 , X is one equivalent of an anion, y is 1-6, z is 0-2, w is 0-8, and p is a number equal to the quotient obtained by dividing the total of y+2z+w by the atomic valence of Me, provided that when y is 2 or more, two or more R groups may be identical or different, when w is 2 or more, two or more X ions may be identical or different, and the group ##STR2## in the case of R=CH 3 is contained in a number of not more than 2 for each Me, and (B) a film-forming polymeric compound, a monomer thereof, or a mixture of these; and thereafter heating the coating, before completion of the crystalline orientation of the film, to convert it on the film surface into numerous minute protrusions substantially having form retention; and a slippery biaxially stretched polyester film having a substantially continuous coating with numerous protrusions substantially having form retention, said coating being formed substantially all over on at least one surface of the film and at least comprising a metal salt having the composition of formula (I) above and a film-forming polymeric compound.

Inventors

• 👤 Tamaki Kanai
• 👤 Hirofumi Yoshikawa
• 👤 Takashi Yamagishi
• 👤 Kenji Suzuki
• 👤 Yoshikatsu Ohta

Bibliographic Details