A solvent composition includes an organic solvent including one or more organic solvents (A) and one or more organic solvents (B), and one or more types of core-shell polymer particles each comprising a core layer and a shell layer. The organic sol vents (A) have a polar teen δp of a Hansen solubility parameter of less than 11 and a hydrogen bond term δh of less than 10, and the organic solvents (B) satisfy at least one of 11 or more of the polar term δp or 10 or more of the hydrogen bond term δh. A weight ratio of (A) to (B) ranges from 15:85 to 95:5. Based on a total weight of the solvent composition, a content of the core-shell polymer particles is 20 to 40% by weight and a water content is 1% by weight or less.

A solvent composition includes an organic solvent including one or more organic solvents (A) and one or more organic solvents (B), and one or more types of core-shell polymer particles each comprising a core layer and a shell layer. The organic sol vents (A) have a polar teen δp of a Hansen solubility parameter of less than 11 and a hydrogen bond term δh of less than 10, and the organic solvents (B) satisfy at least one of 11 or more of the polar term δp or 10 or more of the hydrogen bond term δh. A weight ratio of (A) to (B) ranges from 15:85 to 95:5. Based on a total weight of the solvent composition, a content of the core-shell polymer particles is 20 to 40% by weight and a water content is 1% by weight or less.

The present disclosure discloses a high-performance rubber damping material and a method for preparing the same, relating to the technical field of damping materials. The method for preparing the high-performance rubber damping material includes: grafting hydroxyethyl methacrylate and lignin to a rubber molecular chain of natural rubber latex through graft copolymerization reaction, so as to obtain a high-performance rubber damping material. This method adopts natural rubber latex as a base material, the hydroxyethyl methacrylate and lignin are grafted to the rubber molecular chain of natural rubber latex through graft copolymerization reaction, to form a semi-interpenetrating network structure.

The present disclosure discloses a high-performance rubber damping material and a method for preparing the same, relating to the technical field of damping materials. The method for preparing the high-performance rubber damping material includes: grafting hydroxyethyl methacrylate and lignin to a rubber molecular chain of natural rubber latex through graft copolymerization reaction, so as to obtain a high-performance rubber damping material. This method adopts natural rubber latex as a base material, the hydroxyethyl methacrylate and lignin are grafted to the rubber molecular chain of natural rubber latex through graft copolymerization reaction, to form a semi-interpenetrating network structure.

The present invention relates to a modified conjugated diene-based polymer having excellent affinity with a filler and a method for preparing the same, and provides a modified conjugated diene-based polymer including: a first chain comprising a repeating unit derived from a conjugated diene-based monomer; and one or more graft chains comprising a derived unit from an oligomer and graft-bonded to the first chain, wherein the derived unit from an oligomer comprises a residual group derived from a radical reactive functional group, and a molecular weight distribution increase ratio defined by Mathematical Equation 1 is 20% or less, and a method for preparing the same.

The present invention relates to a modified conjugated diene-based polymer having excellent affinity with a filler and a method for preparing the same, and provides a modified conjugated diene-based polymer including: a first chain comprising a repeating unit derived from a conjugated diene-based monomer; and one or more graft chains comprising a derived unit from an oligomer and graft-bonded to the first chain, wherein the derived unit from an oligomer comprises a residual group derived from a radical reactive functional group, and a molecular weight distribution increase ratio defined by Mathematical Equation 1 is 20% or less, and a method for preparing the same.

A latex of an acid-modified conjugated diene polymer including the acid-modified conjugated diene polymer obtained by modifying a conjugated diene polymer with an acid group-containing compound, in which a content of a structural unit derived from the acid group-containing compound is 0.2 to 0.7 parts by weight with respect to 100 parts by weight of the acid-modified conjugated diene polymer; a content of a water-soluble polymer in the latex is 2 parts by weight or less with respect to 100 parts by weight of the acid-modified conjugated diene polymer; when a solids content of the latex is adjusted to 60 wt %, a viscosity at 25° C. is 800 mPa.Math.s or less; and when the solids content of the latex is adjusted to 50 wt %, the viscosity at 25° C. is 300 mPa.Math.s or less.

A latex of an acid-modified conjugated diene polymer including the acid-modified conjugated diene polymer obtained by modifying a conjugated diene polymer with an acid group-containing compound, in which a content of a structural unit derived from the acid group-containing compound is 0.2 to 0.7 parts by weight with respect to 100 parts by weight of the acid-modified conjugated diene polymer; a content of a water-soluble polymer in the latex is 2 parts by weight or less with respect to 100 parts by weight of the acid-modified conjugated diene polymer; when a solids content of the latex is adjusted to 60 wt %, a viscosity at 25° C. is 800 mPa.Math.s or less; and when the solids content of the latex is adjusted to 50 wt %, the viscosity at 25° C. is 300 mPa.Math.s or less.

An object of the present disclosure is to provide a golf ball having excellent durability and flight distance and good shot feeling for an average golfer who hits a golf ball at a slow head speed. The present disclosure provides a golf ball comprising a spherical core and at least two cover layers covering the spherical core, wherein a difference between a core surface crosslinking density and a core center crosslinking density is more than 1.0×10.sup.2 mol/m.sup.3 and less than 9.0×10.sup.2 mol/m.sup.3, a hardness difference between a core surface hardness Cs (Shore C hardness) and a core center hardness Co (Shore C hardness) is 13.0 or more and 30.0 or less, a compression deformation amount of the core when applying a load from an initial load of 98 N to a final load of 1275 N to the core is less than 3.8 mm, and the at least two cover layers include a first cover layer and a second cover layer positioned closer to the spherical core than the first cover layer, an average hardness Dave=(Ti×Hi+To×Ho)/(Ti+To) of the first cover layer and the second cover layer is 55 or more, wherein To (mm) is a thickness of the first cover layer, Ho (Shore D) is a slab hardness of the first cover layer, Ti (mm) is a thickness of the second cover layer, and Hi (Shore D) is a slab hardness of the second cover layer.

An object of the present disclosure is to provide a golf ball having excellent durability and flight distance and good shot feeling for an average golfer who hits a golf ball at a slow head speed. The present disclosure provides a golf ball comprising a spherical core and at least two cover layers covering the spherical core, wherein a difference between a core surface crosslinking density and a core center crosslinking density is more than 1.0×10.sup.2 mol/m.sup.3 and less than 9.0×10.sup.2 mol/m.sup.3, a hardness difference between a core surface hardness Cs (Shore C hardness) and a core center hardness Co (Shore C hardness) is 13.0 or more and 30.0 or less, a compression deformation amount of the core when applying a load from an initial load of 98 N to a final load of 1275 N to the core is less than 3.8 mm, and the at least two cover layers include a first cover layer and a second cover layer positioned closer to the spherical core than the first cover layer, an average hardness Dave=(Ti×Hi+To×Ho)/(Ti+To) of the first cover layer and the second cover layer is 55 or more, wherein To (mm) is a thickness of the first cover layer, Ho (Shore D) is a slab hardness of the first cover layer, Ti (mm) is a thickness of the second cover layer, and Hi (Shore D) is a slab hardness of the second cover layer.