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Urea-formaldehyde polymers having reduced formaldehyde emission and cellular urea formaldehyde foam which is resistant to acid-induced hydrolysis
Urea-formaldehyde polymers having reduced formaldehyde emission and cellular urea formaldehyde foam which is resistant to acid-induced hydrolysis
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机译:具有降低的甲醛释放量的尿素甲醛聚合物和可抵抗酸诱导水解的多孔尿素甲醛泡沫
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摘要
Urea-formaldehyde polymers having reduced formaldehyde emissions are produced by incorporating in the prepolymer an aromatic substance incapable of reacting with urea formaldehyde in alkaline media but capable of reacting with urea formaldehyde in acid media in an amount sufficient to reduce or eliminate the free formaldehyde emissions therefrom. Also disclosed is a cellular urea-formaldehyde foam which is resistant to acid-induced hydrolysis, the foam prepared by incorporating a polyalkyl polynuclear metal sulfonate foaming agent in the acid catalyst solution for the urea-formaldehyde prepolymer.
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