Biaxially oriented polyester film
AssigneeTeijin Limited
InventorsTakeo Asai, Tadashi Ono
Life of this patent
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Abstract
A biaxially oriented polyester film composed of an intimate mixture of an aromatic polyester, barium sulfate particles having an average particle diameter of 0.1 to 10 micrometers, and an alkali metal or alkaline earth metal salt of a higher fatty acid having 8 to 34 carbon atoms. The fatty acid metal salt has a melting point in the range of 120.degree. to 320.degree. C. The biaxially oriented polyester film has substantially no difference in surface properties such as roughness and the degree of gloss between its surface and back, and can be produced industrially advantageously with high producibility and excellent operability.
Claims9
A biaxially oriented polyester film comprising of an intimate mixture of
- (a) an aromatic polyester,
- (b) 1 to 100 parts by weight, per 100 parts by weight of the aromatic polyester, of barium sulfate particles having an average particle diameter of 0.1 to 10 micrometers, and
- (c) 0.002 to 0.05 mole, per mole of barium sulfate, of an alkali metal or alkaline earth metal salt of a higher fatty acid having 8 to 34 carbon atoms, said fatty acid metal salt having a melting point in the range of 120.degree. to 320.degree. C.
Dependencies are inferred from the claim text.