| 摘要 |
A process for the hydrolysis of polymers of acetoxystyrene to polymers of vinylphenol which comprises: (a) reacting a polymer of 4-acetoxystyrene with ammonia at a temperature of about 50.degree. to about 150.degree.C for a time sufficient to hydrolyze the acetoxy groups to phenol groups; (b) contacting the polymer with wet carbon dioxide gas at a temperature of about 110.degree.c to about 180.degree.C to form ammonium carbonate which immediately decomposes to ammonia, carbon dioxide and water; and (c) removing the decomposition products by sparging with nitrogen or by distillation. This process provides a route to obtain polymers of vinylphenol both free from any hydrolysis reagents and containing high proportions of vinylphenol groups. Polymers of vinylphenol are known compositions which have been used, for example, in the manufacture of metal treatment compositions, photoresists, epoxy resins and epoxy resin curing agents. |
