Unitika Ltd.

Tomohiro Hamada

Tetsuo Matsumoto

Minoru Kishida

Souichiro Kishimoto

Norikazu Matsui

Akihiko Hasegawa

Shinya Takagi

Takamasa Ohwaki

The present invention provides a biaxially oriented polyester film having a linearly tearable property at least in a longitudinal direction, and excellent in the producability at mass production scale, which can be produced from the mixture of polybutylene terephthalate containing 5 to 20% by weight of a polytetramethylene glycol (PTMG) unit having a molecular weight of 600 to 4,000 (modified PBT) and polyethylene terephthalate (PET) in a weight ratio (PET/modified PBT) of 70/30 to 95/5.

Easily tearable biaxially oriented polyester film

A white film to be laminated to a metal surface and a method of producing the same. This white film comprises first and second layers which are laminated with the arrangement of second layer/first layer/second layer. The middle, first layer is composed of 80-40 wt % a first polyester, and 20-60 wt % titanium oxide added therewith. The front and back, second layers are composed of 80-100 wt % a second polyester, and 20-0 wt % titanium oxide. The film is a biaxially stretched film, and the content of titanium oxide in the entire film is 20-50 wt %.

White film to be laminated to metal surface and method of producing same

A resin for coating formation which comprises a polyarylate comprising 2,2-bis(3-methyl-4-hydroxyphenyl)propane units and a divalent carboxylic acid component comprising 10 to 90 mol % of terephthalic acid units and 90 to 10 mol % of isophthalic acid units, having an inherent viscosity measured in 1,1,2,2-tetrachloroethane at a concentration of 1 g/dl at 25.degree. C. of 0.85 or more, and having a carboxyl value of 20 mol/ton or less. Also disclosed is a process for producing the resin by interfacial polymerization, using a quaternary ammonium salt or a quaternary phosphonium salt having at least 3 alkyl groups each having at least 3 carbon atoms as a catalyst.

Resin for coating formation and method for producing the same

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Uji, Japan

Tomohiro Hamada