Idemitsu Kosan Company, Limited

Hiroki Fujinami

Kenji Kobayashi

Yutaka Minami

Tomoaki Takebe

Kazuhiro Hashima

Provided is a hot-melt adhesive for woodworking, containing a component (a) of an olefinic polymer (A) having a specific tensile modulus of elasticity and a specific glass transition temperature (Tg), and a component (b) of an olefinic polymer (B) having a specific glass transition temperature (Tg), wherein the content of the component (a) is 31 to 95% by mass relative to 100% by mass of the total amount of the component (a) and the component (b).

Hot-melt adhesive for woodworking

Provided are a hot-melt adhesive having high flowability in a molten state and exhibiting high adhesion strength in bonding PP nonwoven fabrics and further exhibiting high adhesion strength in bonding PE film-PP nonwoven fabric, and a base polymer for a hot-melt adhesive. The hot-melt adhesive contains (A) a propylene-based polymer satisfying the following (Ai) to (Aiv), and (B) an olefin-based copolymer satisfying the following (Bi) and (Bii); and the base polymer for a hot-melt adhesive consists of a mixture of (A) a propylene-based polymer satisfying the following (Ai) to (Aiv) and (B) an olefin-based copolymer satisfying the following (Bi) and (Bii) and satisfies the following (1) and (2). (Ai) the melting point is 120&#xb0; C. or lower, (Aii) the Mw is 10,000 to 150,000, (Aiii) the Mw/Mn is 2.5 or less, (Aiv) the penetration is 8 or less, (Bi) the penetration is 15 or more, (Bii) the melting point is 90&#xb0; C. or higher, (1) the tensile elastic modulus at 23&#xb0; C. is 400 MPa or less, and (2) the semi-crystallization time at 23&#xb0; C. is 20 minutes or less.

Hot-melt adhesive

Provided are a propylene-based polymer which enhances heat creep resistance and a hot-melt adhesive having excellent heat creep resistance. A propylene-based polymer which satisfies the following (1) and (2): (1) 125&#x2266;a modulus of elasticity in tension (MPa) at 23&#xb0; C.&#x2266;400; and (2) 100&#x2266;an elongation at break (%) at 23&#xb0; C.&#x2266;1,000, and a hot-melt adhesive containing the propylene-based polymer in an amount of 1 to 50% by mass.

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Narashino, Japan

Hiroki Fujinami