A resin composition contains: a resin containing a constituent unit (A) represented by general formula (1); and a resin containing a constituent unit (B) represented by formula (2) and/or a constituent unit (C) represented by formula (3). (R.sub.1 represents a methyl group or an ethyl group, R.sub.2 and R.sub.3 represent a hydrogen atom or a methyl group, and n represents 0 or 1.) (R.sub.a and R.sub.b represent a hydrogen atom, etc., R.sub.h represents an aryl group of 6-20 carbons, X represents a single bond or a fluorene group, A and B represent an alkylene group of 1-4 carbons, m and n represent integers 0-6, and a and b represent integers 0-10.) (R.sub.c and R.sub.d represent a hydrogen atom, etc., Y represents a fluorene group, A and B represent an alkylene group of 1-4 carbons, p and q represent integers 0-4, and a and b represent integers 0-10.)

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This invention relates to a foaming composition, comprising at least one ethylene-vinyl acetate (EVA) copolymer; at least one foaming agent; at least one peroxide compound; at least one polyamine; at least one crosslinking enhancer; at least one primary antioxidant; and at least one secondary antioxidant; the content of the crosslinking enhancer is from 0.1 to 3% by weight based on the total weight of the composition. A foaming article cured from the foaming composition under the temperature range of 80 to 120° C. according to the present invention exhibits high initial volume expansion ratio at the baking window from 130 to 200° C. and shows excellent stability after storage.

This invention relates to a foaming composition, comprising at least one ethylene-vinyl acetate (EVA) copolymer; at least one foaming agent; at least one peroxide compound; at least one polyamine; at least one crosslinking enhancer; at least one primary antioxidant; and at least one secondary antioxidant; the content of the crosslinking enhancer is from 0.1 to 3% by weight based on the total weight of the composition. A foaming article cured from the foaming composition under the temperature range of 80 to 120° C. according to the present invention exhibits high initial volume expansion ratio at the baking window from 130 to 200° C. and shows excellent stability after storage.

An object is to provide a crosslinkable resin composition which does not easily cause an increase in the pressure and a discharge variation in an extruder charged with the crosslinkable resin composition, with which an insulating coating layer can be continuously and stably formed by extrusion molding for a long time, thereby realizing an increase in the production unit of an electric wire/cable.

A crosslinkable resin composition of the present invention contains 100 parts by mass of an ethylene-based resin (A), a stabilizer (B) containing 0.001 to 0.5 parts by mass of a hindered amine light stabilizer (B3), and 0.5 to 3.0 parts by mass of an organic peroxide (C). The hindered amine light stabilizer (B3) is a mixture of a low-molecular-weight hindered amine compound having a molecular weight of 100 to 1,000 and a high-molecular-weight hindered amine compound having a molecular weight of 1,500 to 5,000. The hindered amine light stabilizer (B3) has a reduced viscosity of 3.5 to 5.5 cm.sup.3/g (40° C.) and a reduced viscosity of 2.0 to 3.5 cm.sup.3/g (110° C.).

An object is to provide a crosslinkable resin composition which does not easily cause an increase in the pressure and a discharge variation in an extruder charged with the crosslinkable resin composition, with which an insulating coating layer can be continuously and stably formed by extrusion molding for a long time, thereby realizing an increase in the production unit of an electric wire/cable.

A crosslinkable resin composition of the present invention contains 100 parts by mass of an ethylene-based resin (A), a stabilizer (B) containing 0.001 to 0.5 parts by mass of a hindered amine light stabilizer (B3), and 0.5 to 3.0 parts by mass of an organic peroxide (C). The hindered amine light stabilizer (B3) is a mixture of a low-molecular-weight hindered amine compound having a molecular weight of 100 to 1,000 and a high-molecular-weight hindered amine compound having a molecular weight of 1,500 to 5,000. The hindered amine light stabilizer (B3) has a reduced viscosity of 3.5 to 5.5 cm.sup.3/g (40° C.) and a reduced viscosity of 2.0 to 3.5 cm.sup.3/g (110° C.).

A thermoplastic polymer composition (A) leads to reduced migration of stabilisers or other ingredients (I), if it contains e.g. 50 to 90 wt. %, relative to the polymer composition (A), of a thermoplastic polymer (P), which has migration barrier properties, as well as at least one stabiliser component (S) and/or a further ingredient (I), wherein the following is true for the polymer composition (A): a) the glass transition temperature T.sub.g of the thermoplastic polymer (P) is greater than the use temperature; and b) the polymer-specific constant for polymers (Ap) of the thermoplastic polymer (P) is less than I; and c) the derived diffusion coefficient (Dp) of the thermoplastic polymer (P) for mineral oil is less than 10.sup.−12 cm.sup.2/s at 20° C.; and d) the morphology of the thermoplastic polymer (P) is either single-phase homogeneous, or two-phase heterogeneous.

A thermoplastic polymer composition (A) leads to reduced migration of stabilisers or other ingredients (I), if it contains e.g. 50 to 90 wt. %, relative to the polymer composition (A), of a thermoplastic polymer (P), which has migration barrier properties, as well as at least one stabiliser component (S) and/or a further ingredient (I), wherein the following is true for the polymer composition (A): a) the glass transition temperature T.sub.g of the thermoplastic polymer (P) is greater than the use temperature; and b) the polymer-specific constant for polymers (Ap) of the thermoplastic polymer (P) is less than I; and c) the derived diffusion coefficient (Dp) of the thermoplastic polymer (P) for mineral oil is less than 10.sup.−12 cm.sup.2/s at 20° C.; and d) the morphology of the thermoplastic polymer (P) is either single-phase homogeneous, or two-phase heterogeneous.

An object of the present invention is to provide a golf ball having excellent durability and good shot feeling. The present invention provides a golf ball comprising a core, wherein a difference (crosslinking density at surface of core-crosslinking density at center of core) between a crosslinking density at a surface of the core and a crosslinking density at a center of the core is more than 1.0×10.sup.2 mol/m.sup.3 and less than 9.0×10.sup.2 mol/m.sup.3, and a hardness difference (Hs−Ho) between Hs and Ho is 13.0 or more and 30.0 or less, and the core satisfies H50-Ho>Hs-H50, wherein Hs (Shore C hardness) is a hardness at the surface of the core, Ho (Shore C hardness) is a hardness at the center of the core, and H50 (Shore C hardness) is a hardness at a midpoint between the center of the core and the surface of the core.

An object of the present invention is to provide a golf ball having excellent durability and good shot feeling. The present invention provides a golf ball comprising a core, wherein a difference (crosslinking density at surface of core-crosslinking density at center of core) between a crosslinking density at a surface of the core and a crosslinking density at a center of the core is more than 1.0×10.sup.2 mol/m.sup.3 and less than 9.0×10.sup.2 mol/m.sup.3, and a hardness difference (Hs−Ho) between Hs and Ho is 13.0 or more and 30.0 or less, and the core satisfies H50-Ho>Hs-H50, wherein Hs (Shore C hardness) is a hardness at the surface of the core, Ho (Shore C hardness) is a hardness at the center of the core, and H50 (Shore C hardness) is a hardness at a midpoint between the center of the core and the surface of the core.

A pneumatic tire that rotates about a center axis includes a tread rubber that comprises a contact patch; a groove provided in the tread rubber, the groove having an inner surface that includes a bottom surface and side surfaces that connect the bottom surface to the contact patch; and a coating film disposed covering at least a portion of the inner surface, the coating film reducing exposure of ultraviolet light to the inner surface.