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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP16015778ApriorityCriticalpatent/JPS5589351A/en
Publication of JPS5589351ApublicationCriticalpatent/JPS5589351A/en
PURPOSE: To provide the title solution having excellent viscosity stability, composed of a polyurethane solution containing a small amount of malononitrile.
CONSTITUTION: A polyurethane is dissolved in a solvent (e.g. dimethylformamide) at a concentration of 10W70%; and more than 0.0001wt%, pref. 0.001W1wt% of one or more compounds selected from malononitrile and aromatic compounds having two or more electrophilic groups (e.g. picric acid) is added to the above solution.