ADHESIVE, ADHESIVE TAPE, AND ADHESIVE PRODUCTION METHOD

• Main Authors: UBUKATA MINORU, IIZUKA HIDETAKA, HARA TOMOTAKA
• Format: Patent
• Language: English; Japanese
• Published: 25.07.2019
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; DYES; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF MATERIALS AS ADHESIVES

To provide an adhesive that has sufficient adhesion to a poorly-adhesive adherend such as rubber foam and PE foam and can be used in a high temperature environment.SOLUTION: An adhesive has urethane prepolymer, polythiol, a resin containing a plurality of photoreactive functional groups, and a tackifier. The (A) urethane prepolymer is made from polyol, a monool containing a photoreactive functional group and a monool containing no photoreactive functional group, and polyisocyanate as a raw material. (B) A ratio between the number of equivalents of photoreactive functional groups at terminals of the urethane prepolymer (a) and the number of equivalents of non-photoreactive functional groups (b), (a)/b), is 0.4-2.5. (C) An amount of all the double bonds in the urethane prepolymer and the resin (mol/kg) is 0.1-0.5. (D) A ratio between the number of equivalents of thiol groups in the polythiol (c) and the number of equivalents of double bonds of all the photoreactive functional groups in the urethane prepolymer and the resin (d), (c)/(d), is 0.7-2.5, and (E) an amount of blending of the resin is 0.3 pts.mass or more.SELECTED DRAWING: None 【課題】ゴム発泡体やＰＥ発泡体のような難粘着性の被着体に対し、十分な粘着力を有し、高温環境で使用可能な粘着剤の提供。【解決手段】ウレタンプレポリマーと、ポリチオールと、複数の光反応性官能基を含む樹脂と、粘着付与剤を含む粘着剤であり、（Ａ）ウレタンプレポリマーが、ポリオールと光反応性官能基を含む及び含まないモノオールと、ポリイソシアネートを原料とし、（Ｂ）ウレタンプレポリマーの末端に存在する光反応性官能基の当量数（ａ）と光非反応性官能基の当量数（ｂ）の比（ａ）／ｂ）が０．４〜２．５（Ｃ）ウレタンプレポリマー及び前記樹脂に含まれる全二重結合量（ｍｏｌ／ｋｇ）が０．１〜０．５（Ｄ）ポリチオールに含まれるチオール基の当量数（ｃ）と、ウレタンプレポリマー及び樹脂に含まれる全光反応性官能基の二重結合の当量数（ｄ）の比（ｃ）／（ｄ）が、０．７〜２．５（Ｅ）樹脂の配合量が、０．３質量部以上である粘着剤。【選択図】なし