An aqueous resin dispersion wherein a polymer (C) obtained by bonding a polyolefin (A) to a polyether resin (B) is dispersed in water; and the polyether resin (B) contains a polyether resin (B1) having an HLB of less than 8 and a polyether resin (B2) having an HLB of 8 to 20 according to calculation by the Griffin method.

The disclosed is a preparation method of a propylene-1-butene copolymer by using a catalyst that includes a novel metallocene compound having excellent copolymerization activity.

The disclosed is a preparation method of a propylene-1-butene copolymer by using a catalyst that includes a novel metallocene compound having excellent copolymerization activity.

This is to provide an aqueous metal surface treatment agent for a lithium ion secondary battery which can improve interlaminar adhesiveness between a metal member and a resin coating layer such as a film or a coated film, and solvent resistance without using trivalent chromium. The aqueous metal surface treatment agent for a lithium ion secondary battery comprises a polyvinyl alcohol resin containing 2 to 15 mol % of a 1,2-diol structural unit represented by the formula (1): ##STR00001##
Having a degree of saponification of 90 to 99.9 mol % and an average degree of polymerization of 250 to 3000; and a metallic crosslinking agent.

This is to provide an aqueous metal surface treatment agent for a lithium ion secondary battery which can improve interlaminar adhesiveness between a metal member and a resin coating layer such as a film or a coated film, and solvent resistance without using trivalent chromium. The aqueous metal surface treatment agent for a lithium ion secondary battery comprises a polyvinyl alcohol resin containing 2 to 15 mol % of a 1,2-diol structural unit represented by the formula (1): ##STR00001##
Having a degree of saponification of 90 to 99.9 mol % and an average degree of polymerization of 250 to 3000; and a metallic crosslinking agent.

[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.