HOT MELT ADHESIVE

• Main Authors: INOUE KENTARO, MORIGUCHI MASAHIRO
• Format: Patent
• Language: English; Japanese
• Published: 17.11.2014
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; BANDAGES, DRESSINGS OR ABSORBENT PADS; CHEMISTRY; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; DYES; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PAINTS; POLISHES; PROSTHESES; TREATMENT OR PROTECTION OF EYES OR EARS; USE OF MATERIALS AS ADHESIVES

PROBLEM TO BE SOLVED: To provide a hot melt adhesive allowing low temperature coating and having excellent adhesiveness to a polyolefin base material and high creep resistance, and a disposable product obtained by using the hot melt adhesive.SOLUTION: The hot melt adhesive contains a thermoplastic block copolymer (A) of a vinyl aromatic hydrocarbon and a conjugated diene compound. The thermoplastic block copolymer (A) contains the following components (A1) and (A2). (A1) is a radial type styrene block copolymer including a styrene of 35-45 wt.% and a diblock of 50-90 wt.% and having 250 mPa s of a viscosity at 25°C in a 25 wt.% toluene solution, and (A2) is a styrene block copolymer including a styrene of less than 30 wt.% and having more than 250 mPa s of a viscosity at 25°C in a 25 wt.% toluene solution. 【課題】低温塗工が可能で、ポリオレフィン基材への接着性に優れ、かつ耐クリープ性に優れたホットメルト接着剤、そのホットメルト接着剤を用いて得られる使い捨て製品を提供すること。【解決手段】（Ａ）ビニル系芳香族炭化水素と共役ジエン化合物との共重合体である熱可塑性ブロック共重合体を含有するホットメルト接着剤であって、（Ａ）熱可塑性ブロック共重合体が以下の（Ａ１）成分および（Ａ２）成分を含有するものである、ホットメルト接着剤：（Ａ１）スチレン含有率が３５〜４５重量％、ジブロック含有率が５０〜９０重量％、２５重量％トルエン溶液の２５℃での粘度が２５０ｍＰａ・ｓ以下であるラジアル型スチレンブロック共重合体；及び（Ａ２）スチレン含有率が３０重量％未満、２５重量％トルエン溶液の２５℃での粘度が２５０ｍＰａ・ｓより高いスチレンブロック共重合体。【選択図】なし