Method of stabilising solutions in strong sulphuric acid of polyacrylonitrile and copolymers of acrylonitrile
In a modification or improvement of the method of the parent Specification for stabilizing solutions of acrylonitrile polymers in strong sulphuric acid by adding inhibitors of saponification, there is added to the solution a lactone such as butyrolactone, pyrophosphoric acid, acetic acid, acetic anh...
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| Zusammenfassung: | In a modification or improvement of the method of the parent Specification for stabilizing solutions of acrylonitrile polymers in strong sulphuric acid by adding inhibitors of saponification, there is added to the solution a lactone such as butyrolactone, pyrophosphoric acid, acetic acid, acetic anhydride or n-valeramide. In examples sulphuric acid solutions of copolymers of acrylonitrile and methyl acrylate are stabilized with (1) butyrolactone, (2) pyrophosphoric acid, (3) acetic acid and (4) acetic anhydride. |
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