Polyester compositions and process of preparing polyester films from them
AssigneeDiafoil Company, Limited
InventorsTakashi Kagiyama, Kazuo Endo, Chikakazu Kawaguchi, Yosio Meguro, Kazuhiro Kunugihara
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Abstract
Disclosed herein is a polyester composition comprising 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, are mainly composed of calcium carbonate and contain 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds. Also disclosed herein is a process for preparing a polyester film by the electrostatic cooling method, which process is characterized by using the polyester composition of the present invention.
Claims8
A polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium (Mg) compounds, strontium (Sr) compounds and barium (Ba) compounds.
In a process for preparing a polyester film by the electrostatic cooling method, the improvement comprising utilizing, as a starting material, a polyester composition comprising a polymeric saturated polyester and 0.001-5% by weight of particles which have an average particle size of 0.05-5 micrometers, said particles being mainly composed of calcium carbonate, and containing 0.001-5% by weight of at least one compound selected from the group consisting of magnesium compounds, strontium compounds and barium compounds.
Dependencies are inferred from the claim text.