Preparation of siloxane-bond-containing polyhydrazide acid-amide acid and polyhydradiimide-siloxane-type copolymer resin

Abstract

Abstract PURPOSE:To prepare the titled copolymer capable of forming a colorless and transparent heat-resistant coating film having excellent adhesivity to various materials, by reacting a tetracarboxylic acid dianhydride, a diamine, a dihydrazide, and diaminosiloxane in the presence of a solvent. CONSTITUTION:The objective amide acid is prepared by reacting (A) a tetracarboxylic acid dianhydride (e.g. pyromellitic anhydride), (B) a diamine (e.g. m-phenylenediamine), (C) a dihydrazide (e.g. isophthalic acid dihydrazide) and (D) a diaminosiloxane (e.g. the compound of formula) in the presence of a solvent (e.g. dimethylformamide) usually under anhydrous conditions preferably at <=30 deg.C. The amide acid copolymer can be converted to the objective polyhydradiimide-siloxane-type copolymer by heating preferably at 200-300 deg.C for 0.5-2hr to effect the dehydrative cyclization.

Inventors

• 👤 Shunichiro Uchimura
• 👤 内村　俊一郎
• 👤 Nintei Sato
• 👤 任廷 佐藤
• 👤 Mitsumasa Kojima
• 👤 児嶋　充雅
• 👤 Daisuke Makino
• 👤 大輔 牧野

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