A functionalized ethylene-based polymer dissolved in an appropriate solvent and applied to a nonpolar surface can change the surface polarity/characteristics of the nonpolar surface. This change to the surface polarity/characteristics of the nonpolar surface allows adhesion of materials, such as paint, to surfaces such as polypropylene, polyethylene and polyolefin elastomers.

Provided is a thermoplastic elastomer composition excellent in mechanical characteristics, abrasion resistance, etc., comprising: a crosslinked composition (X) obtained by heat-treating, under molten condition, a composition containing 100 pars of a block copolymer or a hydrogenated product thereof, the block copolymer including a polymer block A mainly derived from an aromatic vinyl compound containing 1% by mass or more of an alkylstyrene and a polymer block B mainly derived from a diene compound, 10 to 300 parts of an olefin-based resin, 0.01 to 20 parts of a crosslinking agent, 1 to 50 parts of a crosslinking adjuvant, and 30 to 250 parts of a softener for rubber; and a hydrogenated block copolymer (Y) obtained by hydrogenating a block copolymer having at least two polymer blocks of an aromatic vinyl compound and at least one polymer block of a conjugated diene compound, with the mass ratio of (X)/(Y)=10/90 to 90/10.

Provided is a thermoplastic elastomer composition excellent in mechanical characteristics, abrasion resistance, etc., comprising: a crosslinked composition (X) obtained by heat-treating, under molten condition, a composition containing 100 pars of a block copolymer or a hydrogenated product thereof, the block copolymer including a polymer block A mainly derived from an aromatic vinyl compound containing 1% by mass or more of an alkylstyrene and a polymer block B mainly derived from a diene compound, 10 to 300 parts of an olefin-based resin, 0.01 to 20 parts of a crosslinking agent, 1 to 50 parts of a crosslinking adjuvant, and 30 to 250 parts of a softener for rubber; and a hydrogenated block copolymer (Y) obtained by hydrogenating a block copolymer having at least two polymer blocks of an aromatic vinyl compound and at least one polymer block of a conjugated diene compound, with the mass ratio of (X)/(Y)=10/90 to 90/10.

Provided are: a thermoplastic elastomer composition, excellent in both abrasion resistance and mechanical characteristics, obtained by heat-treating a mixture under molten condition thereof, the mixture including: 100 parts of at least one addition-polymerized block copolymer selected from a block copolymer and a hydrogenated product thereof; the block copolymer has a polymer block mainly including a structural unit derived from an aromatic vinyl compound and containing 1% by mass or more of a structural unit derived from a styrene having an alkyl group bonded to a benzene ring and a polymer block mainly including a structural unit derived from a conjugated diene compound, 10 to 300 parts olefin-based resin, 0.01 to 20 parts crosslinking agent; 1 to 50 parts crosslinking adjuvant containing one methacryloyl group, one acryloyl group, and one or more hydroxyl group, and 30 to 250 parts rubber softener; and a molded article including the said thermoplastic elastomer composition.

Provided are: a thermoplastic elastomer composition, excellent in both abrasion resistance and mechanical characteristics, obtained by heat-treating a mixture under molten condition thereof, the mixture including: 100 parts of at least one addition-polymerized block copolymer selected from a block copolymer and a hydrogenated product thereof; the block copolymer has a polymer block mainly including a structural unit derived from an aromatic vinyl compound and containing 1% by mass or more of a structural unit derived from a styrene having an alkyl group bonded to a benzene ring and a polymer block mainly including a structural unit derived from a conjugated diene compound, 10 to 300 parts olefin-based resin, 0.01 to 20 parts crosslinking agent; 1 to 50 parts crosslinking adjuvant containing one methacryloyl group, one acryloyl group, and one or more hydroxyl group, and 30 to 250 parts rubber softener; and a molded article including the said thermoplastic elastomer composition.

Composite resin particles comprising 50 to 800 parts by mass of a polystyrene-based resin with respect to 100 parts by mass of a polyolefin-based resin, wherein: when transmission electron microscope (TEM) images obtained by photographing cross-sections of the composite resin particles using a TEM at a magnification of 1,000 are subjected to a binarization processing and areas in the obtained binarized images which correspond to a cross-sectional area of 437.584 μm.sup.2 of the composite resin particles are subjected to image analysis, the polystyrene-based resin satisfies the following requirements: (1) the number of dispersed particles is 180 or more; (2) the maximum of the areas of dispersed particles is 200 μm.sup.2 or less; and (3) the coefficient of variation in dispersion is 100% or more, and the composite resin particles exhibit an inner morphology that includes a mixture of sea-island structure regions and co-continuous structure regions.

Composite resin particles comprising 50 to 800 parts by mass of a polystyrene-based resin with respect to 100 parts by mass of a polyolefin-based resin, wherein: when transmission electron microscope (TEM) images obtained by photographing cross-sections of the composite resin particles using a TEM at a magnification of 1,000 are subjected to a binarization processing and areas in the obtained binarized images which correspond to a cross-sectional area of 437.584 μm.sup.2 of the composite resin particles are subjected to image analysis, the polystyrene-based resin satisfies the following requirements: (1) the number of dispersed particles is 180 or more; (2) the maximum of the areas of dispersed particles is 200 μm.sup.2 or less; and (3) the coefficient of variation in dispersion is 100% or more, and the composite resin particles exhibit an inner morphology that includes a mixture of sea-island structure regions and co-continuous structure regions.

Crosslinkable composition comprising: (a) from 80% by weight to 98% by weight, preferably from 85% by weight to 95% by weight, of at least one high density polyethylene (HDPE); (b) from 2% by weight to 20% by weight, preferably from 5% by weight to 15% by weight, of at least one linear low density polyethylene (LLDPE); (c) from 0.2 parts by weight to 1.5 parts by weight, preferably from 0.5 parts by weight to 0.8 parts by weight, with respect to 100 parts by weight of (a)+(b), of at least one crosslinking agent selected from organic peroxides; (d) from 0.2 parts by weight to 2.5 parts by weight, preferably from 0.5 parts by weight to 1.0 parts by weight, with respect to 100 parts by weight of (a)+(b), of at least one co-crosslinking agent selected from allyl compounds. Said crosslinkable composition can advantageously be used in rotational molding (“rotomolding”).

Provided is an insulated electric wire, a wire harness, and a composition for an electric wire coating material with which the amount of a filler, which is the flame retardant, can be reduced as much as possible without using electron beam crosslinking, the composition having a high heat resistance, a high gel fraction, flexibility, and good workability of assembling a wire harness. An electric wire coating material is made of a composition comprising (A) a silane-grafted polyolefin obtained by grafting a silane coupling agent onto a polyolefin having a density of 0.855 to 0.885 g/cm.sup.3, (B) an unmodified polyolefin having a density of 0.890 to 0.955 g/cm.sup.3, (C) a modified polyolefin modified by one or more functional groups selected from a carboxylic acid group, an acid anhydride group, an amino group, an acrylic group, a methacrylic group, and an epoxy group, (D) a bromine-based flame retardant and antimony trioxide, (E) a crosslinking catalyst batch, (F) zinc oxide and an imidazole-based compound, or zinc sulfide, (G) an antioxidant, (H) a metal deactivator, and (I) a lubricant.

Provided is an insulated electric wire, a wire harness, and a composition for an electric wire coating material with which the amount of a filler, which is the flame retardant, can be reduced as much as possible without using electron beam crosslinking, the composition having a high heat resistance, a high gel fraction, flexibility, and good workability of assembling a wire harness. An electric wire coating material is made of a composition comprising (A) a silane-grafted polyolefin obtained by grafting a silane coupling agent onto a polyolefin having a density of 0.855 to 0.885 g/cm.sup.3, (B) an unmodified polyolefin having a density of 0.890 to 0.955 g/cm.sup.3, (C) a modified polyolefin modified by one or more functional groups selected from a carboxylic acid group, an acid anhydride group, an amino group, an acrylic group, a methacrylic group, and an epoxy group, (D) a bromine-based flame retardant and antimony trioxide, (E) a crosslinking catalyst batch, (F) zinc oxide and an imidazole-based compound, or zinc sulfide, (G) an antioxidant, (H) a metal deactivator, and (I) a lubricant.