A rubber composition exhibits high stiffness, without using high amounts of reinforcing filler or without using reinforcing resins, while at the same time possesses improved limiting properties. This composition is based on at least one elastomer matrix containing more than 50 phr of at least one copolymer containing ethylene units and diene units, on from 0 to 50 phr of reinforcing filler, on at least 3 phr of a polyethylene and on a crosslinking system.

The present invention relates to a high-melt-strength polypropylene resin, and a preparation method therefor. A method for preparing the high-melt-strength polypropylene resin, according to the present invention, comprises the steps of: creating a polypropylene by polymerizing propylene monomers in the presence of a metallocene catalyst; and putting a diene compound and a comonomer into the created polypropylene and unreacted propylene monomers and reacting same, thereby forming a C40 or greater long-chain branch on the main chain of the polypropylene.

The present invention relates to a high-melt-strength polypropylene resin, and a preparation method therefor. A method for preparing the high-melt-strength polypropylene resin, according to the present invention, comprises the steps of: creating a polypropylene by polymerizing propylene monomers in the presence of a metallocene catalyst; and putting a diene compound and a comonomer into the created polypropylene and unreacted propylene monomers and reacting same, thereby forming a C40 or greater long-chain branch on the main chain of the polypropylene.

The present invention relates to a long-chain branched elastic terpolymer capable of satisfying excellent processability and elasticity (flexibility) at the same time, which is obtained in the presence of a Group IV transition metal catalyst, and a preparation method thereof. The elastic terpolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, wherein i) its weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) x which is the ethylene content (% by weight) and y which is the density value (g/cm.sup.3) of the copolymer measured when the ethylene content is X satisfy a relationship of 0.0000175214x(x75.65420571)+0.875y0.0000175214x(x75.65420571)+0.881.

The present invention relates to a long-chain branched elastic terpolymer capable of satisfying excellent processability and elasticity (flexibility) at the same time, which is obtained in the presence of a Group IV transition metal catalyst, and a preparation method thereof. The elastic terpolymer is a copolymer of ethylene, an alpha-olefin having 3 to 20 carbon atoms, and a diene, wherein i) its weight average molecular weight measured by GPC is 100,000 to 500,000, and ii) x which is the ethylene content (% by weight) and y which is the density value (g/cm.sup.3) of the copolymer measured when the ethylene content is X satisfy a relationship of 0.0000175214x(x75.65420571)+0.875y0.0000175214x(x75.65420571)+0.881.

To provide a fluorinated copolymer composition whereby a crosslinked rubber article having a low compression set at high temperature can be formed, and a crosslinked rubber article. The fluorinated copolymer composition of the present invention comprises a fluorinated copolymer, an organic peroxide, a compound having at least two polymerizable unsaturated bonds and a phosphorus compound having a melting point of 60 C. or lower.

To provide a fluorinated copolymer composition whereby a crosslinked rubber article having a low compression set at high temperature can be formed, and a crosslinked rubber article. The fluorinated copolymer composition of the present invention comprises a fluorinated copolymer, an organic peroxide, a compound having at least two polymerizable unsaturated bonds and a phosphorus compound having a melting point of 60 C. or lower.

[Problem] Provided is an additive for a hot melt adhesive, with which additive a hot melt adhesive composition excellent in low-temperature applicability and bleedout resistance can be obtained.

[Solution] The present invention is an additive for a hot melt adhesive, including a C5 resin, wherein the additive for a hot melt adhesive is characterized in that the viscosity performance index VI of the C5 resin is 1.0 or more and 10,000 or less.

[Problem] Provided is an additive for a hot melt adhesive, with which additive a hot melt adhesive composition excellent in low-temperature applicability and bleedout resistance can be obtained.

[Solution] The present invention is an additive for a hot melt adhesive, including a C5 resin, wherein the additive for a hot melt adhesive is characterized in that the viscosity performance index VI of the C5 resin is 1.0 or more and 10,000 or less.

A photocurable composition comprises a first component composed of a photocurable compound, a second component composed of a photopolymerization initiator, a third component composed of black particles, and a fourth component composed of non-black particles. The mass concentration of the fourth component in the composition is more than 100 times the mass concentration of the third component and less than 3000 times the mass concentration of the third component.