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.

A propylene polymer satisfying (a) below, a soft propylene copolymer satisfying (b) below, and a polyolefin containing a structural unit derived from an unsaturated carboxylic acid and/or a derivative thereof, wherein (a) a melting point is 100° C. or more, and (b) an MFR is in the range of 0.01 to 100 g/10 min, at least one of the following requirements (b-1) and (b-2) is satisfied: (b-1) a syndiotactic triad fraction s 60% or more, and (b-2) a structural unit derived from propylene is 55 to 90 mol % and a structural unit derived from at least one olefin having 2 to 20 carbon atoms (excluding propylene) is contained at 10 to 45 mol % (with provisos), and the relation between an intrinsic viscosity [η] (dL/g) and the MFR satisfies the relation: 1.50×MFR.sup.−0.20≤[η]≤2.65×MFR.sup.−0.20.

There are provided a resin composition that is suitable for the production of a flame-retardant molded article and that can provide high flame retardancy even with a small amount of flame retardant added, and a flame retardancy determination method for determining the flame retardancy of a resin composition. The resin composition of the present invention contains a thermoplastic resin, a cellulosic material, and a phosphate flame retardant and satisfies relational expressions (1) and (2) (where in expressions (1) and (2), T.sub.P, T.sub.B, and T.sub.CMP are temperatures at weight loss rate peaks in thermogravimetric analysis, T.sub.P is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, T.sub.B is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and T.sub.CMP is a temperature (° C.) at a weight loss rate peak of the resin composition. When the resin composition has two weight loss rate peaks, T.sub.CMP is a temperature at a peak on a lower temperature side).

There are provided a resin composition that is suitable for the production of a flame-retardant molded article and that can provide high flame retardancy even with a small amount of flame retardant added, and a flame retardancy determination method for determining the flame retardancy of a resin composition. The resin composition of the present invention contains a thermoplastic resin, a cellulosic material, and a phosphate flame retardant and satisfies relational expressions (1) and (2) (where in expressions (1) and (2), T.sub.P, T.sub.B, and T.sub.CMP are temperatures at weight loss rate peaks in thermogravimetric analysis, T.sub.P is a temperature (° C.) at a weight loss rate peak of the thermoplastic resin, T.sub.B is a temperature (° C.) at a weight loss rate peak of the cellulosic material, and T.sub.CMP is a temperature (° C.) at a weight loss rate peak of the resin composition. When the resin composition has two weight loss rate peaks, T.sub.CMP is a temperature at a peak on a lower temperature side).

Provided are dried cellulose fibers that are satisfactory dispersible in a resin when the cellulose fibers are mixed with the resin and can improve physical properties such as tensile elastic modulus and tensile strength of a resin composite, a cellulose fiber-resin composite including the cellulose fibers, and a molded article. The dried cellulose fibers include cellulose fibers, the cellulose fiber-resin composite includes the dried cellulose fibers, and the molded article is formed from the cellulose fiber-resin composite. The cellulose fibers have an average fiber diameter of 0.1 μm more and 20 μm or less and have a hemicellulose content of 50% or less in constituent sugar components. The dried cellulose fibers have a water content of 10% by mass or less.

Provided are dried cellulose fibers that are satisfactory dispersible in a resin when the cellulose fibers are mixed with the resin and can improve physical properties such as tensile elastic modulus and tensile strength of a resin composite, a cellulose fiber-resin composite including the cellulose fibers, and a molded article. The dried cellulose fibers include cellulose fibers, the cellulose fiber-resin composite includes the dried cellulose fibers, and the molded article is formed from the cellulose fiber-resin composite. The cellulose fibers have an average fiber diameter of 0.1 μm more and 20 μm or less and have a hemicellulose content of 50% or less in constituent sugar components. The dried cellulose fibers have a water content of 10% by mass or less.

Provided is an epoxy resin composition that can achieve excellent low dielectric characteristics and high adhesive strength to metal. Specifically, provided is an epoxy resin composition comprising organic fine particles and an epoxy resin having a specific structure.

Provided is an epoxy resin composition that can achieve excellent low dielectric characteristics and high adhesive strength to metal. Specifically, provided is an epoxy resin composition comprising organic fine particles and an epoxy resin having a specific structure.

The present invention relates to a curable petroleum resin, a preparation method therefor, and use thereof, wherein the curable petroleum resin comprises a repeating unit derived from a petroleum resin monomer, a repeating unit derived from a silane monomer and a repeating unit derived from a cyclic anhydride monomer, and wherein the curable petroleum resin is used as an additive for a reactive polyolefin-based adhesive composition to increase the adhesive strength to a polyolefin-based substrate used for various parts.

The present invention relates to a curable petroleum resin, a preparation method therefor, and use thereof, wherein the curable petroleum resin comprises a repeating unit derived from a petroleum resin monomer, a repeating unit derived from a silane monomer and a repeating unit derived from a cyclic anhydride monomer, and wherein the curable petroleum resin is used as an additive for a reactive polyolefin-based adhesive composition to increase the adhesive strength to a polyolefin-based substrate used for various parts.