Aqueous latex of vinylidene chloride copolymer An aqueous latex [latex (L)] of a vinylidene chloride copolymer [copolymer (A)], wherein the copolymer (A) consists essentially of recurring units derived from vinylidene chloride (VDC) in an amount comprised between 89.0 and 91.0 wt % of the copolymer, recurring units derived from methacrylonitrile (MAN) in an amount comprised between 2.00 and 5.50 wt % of the copolymer, recurring units derived from at least one ionic comonomer (ICO) in an amount comprised between 0.5 and 1.4 wt % of the copolymer (A), and recurring units derived from methylmethacrylate (MMA) in an amount such that the total of recurring units of VDC, MAN, ICO and MMA is 100 wt %, and wherein the latex (L) comprises at least one surfactant [surfactant (S)] in an amount comprised between 0.09 and 1.50 wt % of the copolymer (A).
Process for the manufacture of the aqueous latex (L), film made therefrom and retort pouch prepared with such film.

Aqueous latex of vinylidene chloride copolymer An aqueous latex [latex (L)] of a vinylidene chloride copolymer [copolymer (A)], wherein the copolymer (A) consists essentially of recurring units derived from vinylidene chloride (VDC) in an amount comprised between 89.0 and 91.0 wt % of the copolymer, recurring units derived from methacrylonitrile (MAN) in an amount comprised between 2.00 and 5.50 wt % of the copolymer, recurring units derived from at least one ionic comonomer (ICO) in an amount comprised between 0.5 and 1.4 wt % of the copolymer (A), and recurring units derived from methylmethacrylate (MMA) in an amount such that the total of recurring units of VDC, MAN, ICO and MMA is 100 wt %, and wherein the latex (L) comprises at least one surfactant [surfactant (S)] in an amount comprised between 0.09 and 1.50 wt % of the copolymer (A).
Process for the manufacture of the aqueous latex (L), film made therefrom and retort pouch prepared with such film.

Aqueous latex of vinylidene chloride copolymer An aqueous latex [latex (L)] of a vinylidene chloride copolymer [copolymer (A)], wherein the copolymer (A) consists essentially of recurring units derived from vinylidene chloride (VDC) in an amount comprised between 89.0 and 91.0 wt % of the copolymer, recurring units derived from methacrylonitrile (MAN) in an amount comprised between 2.00 and 5.50 wt % of the copolymer, recurring units derived from at least one ionic comonomer (ICO) in an amount comprised between 0.5 and 1.4 wt % of the copolymer (A), and recurring units derived from methylmethacrylate (MMA) in an amount such that the total of recurring units of VDC, MAN, ICO and MMA is 100 wt %, and wherein the latex (L) comprises at least one surfactant [surfactant (S)] in an amount comprised between 0.09 and 1.50 wt % of the copolymer (A).
Process for the manufacture of the aqueous latex (L), film made therefrom and retort pouch prepared with such film.

Acrylic and modacrylic fiber stabilized against sunlight The invention is related to increasing the resistance of acrylic fiber containing at least 85% acrylonitrile groups and modacrylic fibers containing at least 40% acrylonitrile groups and at least 40% vinylidene chloride groups, against UV light and surface heating caused by sunlight.

Acrylic and modacrylic fiber stabilized against sunlight The invention is related to increasing the resistance of acrylic fiber containing at least 85% acrylonitrile groups and modacrylic fibers containing at least 40% acrylonitrile groups and at least 40% vinylidene chloride groups, against UV light and surface heating caused by sunlight.

Acrylic and modacrylic fiber stabilized against sunlight The invention is related to increasing the resistance of acrylic fiber containing at least 85% acrylonitrile groups and modacrylic fibers containing at least 40% acrylonitrile groups and at least 40% vinylidene chloride groups, against UV light and surface heating caused by sunlight.

Provided is a water dispersion of a vinyl halide copolymer having favorable film formation property after long-term storage while maintaining high water vapor barrier property of a film after coating. A water dispersion of a vinyl halide copolymer comprises a vinyl halide copolymer containing a structural unit derived from a vinyl halide monomer and a structural unit derived from a copolymerization monomer whose reactivity ratio r1 is less than 0.7, wherein a mass ratio of the structural unit derived from the copolymerization monomer is 1 part by mass or more with respect to 100 parts by mass in total of the structural unit derived from the vinyl halide monomer, the structural unit derived from the copolymerization monomer, and a structural unit derived from a copolymerization monomer whose reactivity ratio r1 is 0.7 or more, and S1/(S1+S2) is 0 or more and 0.33 or less.

Provided is a water dispersion of a vinyl halide copolymer having favorable film formation property after long-term storage while maintaining high water vapor barrier property of a film after coating. A water dispersion of a vinyl halide copolymer comprises a vinyl halide copolymer containing a structural unit derived from a vinyl halide monomer and a structural unit derived from a copolymerization monomer whose reactivity ratio r1 is less than 0.7, wherein a mass ratio of the structural unit derived from the copolymerization monomer is 1 part by mass or more with respect to 100 parts by mass in total of the structural unit derived from the vinyl halide monomer, the structural unit derived from the copolymerization monomer, and a structural unit derived from a copolymerization monomer whose reactivity ratio r1 is 0.7 or more, and S1/(S1+S2) is 0 or more and 0.33 or less.

Provided is a gas barrier film having at least one surface of a substrate layer covered with a coating layer containing a first vinylidene chloride copolymer containing a carbonyl group, with an inorganic layer interposed between the substrate layer and the coating layer. The obtained gas barrier film can improve the high barrier properties against gases such as water vapor, and can improve interlayer adherence even with a laminated structure of an inorganic layer and an organic layer. An integral value of signals at from 170 to 180 ppm in a .sup.13C-NMR spectrum of the first vinylidene chloride copolymer may be at least 0.001 times an integral value of signals at from 80 to 85 ppm. The first vinylidene chloride copolymer may further include a cyano group. The coating layer may further include a second vinylidene chloride copolymer, in a .sup.13C-NMR spectrum of which, an integral value of signals at from 170 to 180 ppm is less than 0.001 times an integral value of signals at from 80 to 85 ppm. The coating layer may further include a silane coupling agent. The inorganic layer may be silicon oxide.

Provided is a gas barrier film having at least one surface of a substrate layer covered with a coating layer containing a first vinylidene chloride copolymer containing a carbonyl group, with an inorganic layer interposed between the substrate layer and the coating layer. The obtained gas barrier film can improve the high barrier properties against gases such as water vapor, and can improve interlayer adherence even with a laminated structure of an inorganic layer and an organic layer. An integral value of signals at from 170 to 180 ppm in a .sup.13C-NMR spectrum of the first vinylidene chloride copolymer may be at least 0.001 times an integral value of signals at from 80 to 85 ppm. The first vinylidene chloride copolymer may further include a cyano group. The coating layer may further include a second vinylidene chloride copolymer, in a .sup.13C-NMR spectrum of which, an integral value of signals at from 170 to 180 ppm is less than 0.001 times an integral value of signals at from 80 to 85 ppm. The coating layer may further include a silane coupling agent. The inorganic layer may be silicon oxide.