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.

A degradable EVOH high-barrier composite film, characterized in that the materials of various layers in the composite film all obtain approximately-consistent biodegradability by introducing biomass, and the additive amount of the additive master batch in the materials of each layer is controlled within the range of 0.3-15% of the total mass of the materials of the corresponding layer; the hydrophilic activity of the hydrophilic groups in the additive master batch should be greater than or equal to that of the hydrophilic groups in the materials of each layer; by adding the additive master batch, the mole ratios of the hydrophilic groups to carbon atoms of the materials of various layers tend to be consistent, namely, the bioactivities tend to be consistent, so that the degradation rates of the materials of various layers in the composite film tend to be consistent. The present invention makes contribution to obtaining approximately-consistent bioactivities and approximately-consistent biodegradation rates by balancing the mole ratios of the hydrophilic groups to carbon atoms in the materials of various layers, and the appearance, the functions and the physical and mechanical properties of a product remain unchanged.

The resin composition of the present invention comprises 40 to 98 parts by mass of a modified starch (A), 2 to 60 parts by mass of a polyvinyl alcohol (B) having a degree of saponification of 75.0 mol% or more, and optionally a clay (C), wherein the total content of the (A), (B) and (C) is 100 parts by mass, and the peak temperature of tan δ in measurement of dynamic viscoelasticity in a range of 20° C. to 150° C. is 128° C. or lower.

Provided is a gas barrier material having superior gas barrier properties. This gas barrier material 1 comprises a matrix resin 2, and a carbon material 3 disposed in the matrix resin 2, wherein the carbon material 3 contains a partially exfoliated graphite having a structure in which graphite is partially exfoliated.

The present invention relates to a polyketone copolymer consisting of repeating units represented by general formulae (3) and (4) below, and a mixture composition thereof. The present invention has excellent has barrier properties and thus can be used for vehicle fuel tanks, vehicle hydrogen tank liners, sealed food containers, etc.

—(CH2CH2—CO)x—  (3)

—(CH2CH(CH3)—CO)y—  (4)

(wherein x and y denote the mol % of each of the general formulae (3) and (4) in a polymer).

The present invention provides polyethylene-based compositions suitable for packaging applications, films, and articles. In one aspect, a polyethylene-based composition suitable for packaging applications comprises (a) at least 97% by weight, based on the total weight of the polyethylene-based composition, of a polyethylene composition comprising: (i) from 25 to 37 percent by weight of a first polyethylene fraction having a density in the range of 0.935 to 0.947 g/cm.sup.3 and a melt index (I.sub.2) of less than 0.1 g/10 minutes; and (ii) from 63 to 75 percent by weight of a second polyethylene fraction; and (b) 90 to 540 ppm, based on the total weight of the polyethylene-based composition of a calcium salt of 1,2-cyclohexanedicarboxylic acid; wherein the polyethylene composition has less than 0.10 branches per 1,000 carbon atoms when measured using .sup.13C NMR, wherein the density of the polyethylene-based composition N is at least 0.965 g/cm.sup.3, and wherein the melt index (I.sub.2) of the polyethylene-based composition is 0.5 to 10 g/10 minutes.

A resin composition which has oxygen-barrier properties less apt to depend on humidity and has high transparency; and a formed article and a film which include the resin composition are provided. The resin composition includes from 10 to 90 parts by mass of a polyamide resin (A) and from 90 to 10 parts by mass of a polyamide resin (B), wherein the polyamide resin (A) includes constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, with 70 mol % or more of the constituent units derived from a diamine being derived from xylylenediamine and 90 mol % or more of the constituent units derived from a dicarboxylic acid being derived from adipic acid; the polyamide resin (B) includes constituent units derived from a diamine and constituent units derived from a dicarboxylic acid, 70 mol % or more of the constituent units derived from a diamine being derived from xylylenediamine, from 30 to 65 mol % of the constituent units derived from a dicarboxylic acid being derived from an α,ω-linear chain aliphatic dicarboxylic acid having from 4 to 20 carbons, and from 70 to 35 mol % of the constituent units derived from a dicarboxylic acid being derived from isophthalic acid.

A polyester composition is suitable for food and beverage packaging. The polyester composition is obtained by blending: (a) 90-97 wt. % of a thermoplastic polyester selected from polyethylene terephthalate, polyethylene naphthalene, and mixtures thereof, (b) 2-6 wt. % of MXD6, (c) 1-5000 ppm of a cobalt salt, (d) 0.1-1000 ppm ethylene glycol (EG), and (e) 0.1-1000 ppm of pyromellitic dianhydride (PMDA).

A thermoplastic polymer composition comprises a polyethylene polymer composition and a salt of bicyclo[2.2.1]heptane-2,3-dicarboxylic acid. The polyethylene polymer composition can have a Melt Relaxation Ratio of 1.5 or greater. A method for molding a thermoplastic polymer composition comprises the steps of (a) providing an apparatus comprising a die and a mold cavity; (b) providing the thermoplastic polymer composition described above; (c) heating the thermoplastic polymer composition to melt the thermoplastic polymer composition; (d) extruding the molten thermoplastic polymer composition through the die to form a parison; (e) capturing the parison in the mold cavity; (f) blowing a pressurized fluid into the parison to inflate the parison and conform it to the interior surface of the mold cavity; (g) allowing the molded article to cool so that the molded article retains its shape; and (h) removing the molded article from the mold cavity.

A thermoplastic polymer composition comprises a polyethylene polymer composition and a salt of bicyclo[2.2.1]heptane-2,3-dicarboxylic acid. The polyethylene polymer composition can have a Melt Relaxation Index of 2 or greater. A method for molding a thermoplastic polymer composition comprises the steps of (a) providing an apparatus comprising a die with an annular orifice, a means for blowing pressurized fluid into a tube exiting the die orifice, and a means for drawing and collecting the tube; (b) providing the thermoplastic polymer composition described above; (c) heating the thermoplastic polymer composition to melt the thermoplastic polymer composition; (d) extruding the molten thermoplastic polymer composition through the die to form a tube; (e) blowing a pressurized fluid into the tube to inflate the tube while simultaneously drawing it; (f) allowing the film to cool; and (g) collecting the film.