A Novel Curing System for One-component Moisture Cure Urethane

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  • ISHIKAWA Kazunori
    R&D Center, Organic synthesis laboratory, The Yokohama Rubber Co., LTD.
  • ISAKA Akihiro
    MB Products Technical Development Division, The Yokohama Rubber Co., LTD.
  • HOSODA Hiroyuki
    MB Products Technical Development Division, The Yokohama Rubber Co., LTD.

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Other Title
  • 湿気硬化型一液ウレタン樹脂用潜在性硬化システムの構築-潜在性硬化剤を潜在的に活性化させる触媒-
  • シッケ コウカガタ イチエキ ウレタン ジュシヨウ センザイセイ コウカ システム ノ コウチク センザイセイ コウカザイ オ センザイテキ ニ カッセイカ サセル ショクバイ

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Description

A novel curing system having oxazolidine and phosphoric acid silyl ester for one-component moisture cure urethane was developed. Oxazolidine has been used for one-component moisture cure urethane and its hydrolysis is known to be accelerated by acid and tin-catalyst. But moisture cure urethane using oxazolidine and the catalysts was not good enough for storage stability. Control of curing time and storage stability was achieved by adding phosphoric acid trimethylsilyl ester in the moisture cure urethane system. Phosphoric acid trimethylsilyl ester acted as a moisture latent catalyst for activation of oxazolidine.

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