EPOXY RESIN COMPOSITION

• Main Author: IWATANI KAZUKI
• Format: Patent
• Language: English; Japanese
• Published: 04.03.2021
• Subjects: ADHESIVES; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; POLISHES; THEIR PREPARATION OR CHEMICAL WORKING-UP; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide an epoxy resin composition which is cured in a short time even under a low-temperature condition to yield a cured product that has a low glass transition point (Tg) and virtually no change in Tg even over a long period of time after curing.SOLUTION: There is provided an epoxy resin composition including: (A) at least one thiol-based curing agent containing a polyfunctional thiol compound having three or more thiol groups; (B) at least one polyfunctional epoxy resin; (C) a crosslinking density regulator comprising at least one monofunctional epoxy resin; (D) a curing catalyst; and (E) a silica filler having an average particle size of 5.0 μm or less. A ratio of a sum of an epoxy functionality equivalents for the components (B) and (C) to a thiol functionality equivalent for the component (A) ([epoxy functionality equivalent]/[thiol functionality equivalent]) is 0.70 or more and 1.10 or less, and the amount (mol) of the component (C) is 25 to 70% of a sum of an amount (mol) of the component (B) and an amount (mol) of the component (C). The epoxy resin composition has a viscosity of 2000 MPa s or less at 30°C.SELECTED DRAWING: None 【課題】低温条件下でも短時間で硬化し、ガラス転移点（Ｔｇ）が低く、硬化後に長時間経過してもＴｇがほとんど変化しない硬化物を与えるエポキシ樹脂組成物の提供。【解決手段】（Ａ）少なくとも１種の、チオール基を３つ以上有する多官能チオール化合物を含むチオール系硬化剤（Ｂ）少なくとも１種の多官能エポキシ樹脂（Ｃ）少なくとも１種の単官能エポキシ樹脂を含む架橋密度調節剤（Ｄ）硬化触媒及び（Ｅ）平均粒径が５．０μｍ以下のシリカフィラー、を含み、成分（Ｂ）及び（Ｃ）についてのエポキシ官能基当量の合計の、成分（Ａ）についてのチオール官能基当量に対する比（〔エポキシ官能基当量〕／〔チオール官能基当量〕）が、０．７０以上、１．１０以下であり、成分（Ｃ）の量（ｍｏｌ）が、成分（Ｂ）の量（ｍｏｌ）と成分（Ｃ）の量（ｍｏｌ）の合計の２５〜７０％であり、３０℃での粘度が２０００ｍＰａ・ｓ以下である、エポキシ樹脂組成物。【選択図】なし