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AssigneeToray Industries, Inc.
InventorsMinoru Yoshida, Masaru Suzuki, Masahiro Kimura, Toshihiro Sasaki
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According to the present invention there is provided a polyester composition comprising an aromatic polyester having copolymerized therein a compound containing at least one sulfonic acid group or sulfonic acid metal salt group, and crosslinked polymer particles, preferably crosslinked polymer particles coated with a water-soluble polymer. The particles are incorporated in a slurried state into the polymer. There is also provided a laminate film containing the polymer with the particles thus incorporated therein. The polyester composition is superior in uniform dispersibility of the particles, re-agglomeratin does not occur in melt-storage for a long time, and films formed using the polyester composition are superior in traveling performance and abrasion resistance.
A biaxially oriented polyester film formed by using a polyester composition comprising (A) an aromatic polyester resin having copolymerized therein, a compound containing at least one sulfonic acid group or sulfonic acid metal salt group and (B) substantially uniformly monodispersed crosslinked polymer particles, wherein the amount of the compound containing at least one sulfonic acid group or sulfonic acid metal salt group copolymerized in aromatic polyester (A) is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of carboxylic acid components of said aromatic polyester.
A biaxially oriented polyester laminate film having as at least one layer a film formed by using a polyester composition comprising (A) an aromatic polyester resin having copolymerized therein, a compound containing at least one sulfonic acid group or sulfonic acid metal salt group and (B) substantially uniformly monodispersed crosslinked polymer particles wherein the amount of the compound containing at least one sulfonic acid group or sulfonic acid metal salt group copolymerized in aromatic polyester (A) is in the range of 0.1 to 10 parts by weight based on 100 parts by weight of carboxylic acid components of said aromatic polyester.
Dependencies are inferred from the claim text.