Asahi Kasei Chemicals Corporation

Kazuhiro Daikai

Hiroshi Uchida

Yoshikimi Kondo

Taketoshi Usui

Hisanao Yamamoto

Kazuhiko Yamamoto

Provided is a microcapsule-based hardener for an epoxy resin, which have a core (C) formed using a hardener (H) for the epoxy resin as a starting material and a shell (S) for covering the core (C) therewith. Since it is characterized in that the hardener (H) for the epoxy resin has an average particle size exceeding 0.3 &#x3bc;m and not greater than 12 &#x3bc;m; a content of a small-particle-size hardener for epoxy resin defined to have a particle size 0.5 time or less of the average particle size of the hardener (H) for the epoxy resin is from 0.1 to 15%; and the shell (S) has, on the surface thereof, a binding group (x) capable of absorbing infrared rays having a wave number of from 1630 to 1680 cm, a binding group (y) capable of absorbing infrared rays having a wave number of from 1680 to 1725 cm, and a binding group (z) capable of absorbing infrared rays having a wave number of from 1730 to 1755 cm, it is excellent in storage stability and at the same time, in reaction rapidity.

Microcapsule-based hardener for epoxy resin, masterbatch-based hardener composition for epoxy resin, one-part epoxy resin composition, and processed good

A microencapsulated latent hardener for epoxy resins which comprises cores (C) and shells (S) with which the cores are covered, characterized in that the cores (C) are ones formed from, as a starking material, particles of an epoxy resin hardener (H) comprising an amine adduct (A) and a low-molecular amine compound (B) as major ingredients and that the shells (S) have on the surface thereof connecting groups (x), (y), and (z) which absorb infrared. Also provided is an epoxy resin composition containing the hardener.

High-stability microencapsulated hardened for epoxy resin and epoxy resin composition

An amine hardener for epoxy resins which comprises an amine adduct (A) and a low-molecular amine compound (B) as major components, wherein the molecular weight distribution of the amine adduct (A), which is defined by the ratio of the weight-average molecular weight to the number-average molecular weight, is 3 or lower and the low-molecular amine compound (B) is contained in an amount of 0.001 to 1 part by mass per 100 parts by mass of the amine adduct (A).

Growing community of inventors

Tokyo, Japan

Kazuhiro Daikai