| 摘要 |
Cellulose acetate is mixed with phosphoric acid in the presence of a solvent or mixture of solvents to form solutions from which non-inflammable films, lacquers, and varnishes may be obtained. Any of the phosphoric acids may be used such as ortho-, pyro-, meta-, or hypo-phosphoric acid. In an example, cellulose acetate dissolved in acetone is mixed with /ba1/500/be part of its weight of phosphoric acid diluted with acetone. Other cellulose acetate solvents or plasticizers may be present. The ingredients are mixed thoroughly to form a fluid mass which is filtered if desired. Non-solvents such as benzene, or alcohol, and higher boiling point solvents such as amyl alcohol, amyl acetate, or butyl acetate may be present. It is preferred to employ /ba1/20/be to /ba1/2/be parts of phosphoric acid for every 100 parts of cellulose acetate.ALSO:Cellulose acetate is mixed with phosphoric acid in the presence of a solvent or mixture of miscible solvents to form solutions from which practically non-inflammable films may be obtained. The solutions may also be used as lacquers and varnishes and for making other plastic bodies. Any of the phosphoric acids may be used such as ortho-, pyro-, meta-, or hypo-phosphoric acid. In an example, cellulose acetate dissolved in acetone is mixed with 1/500 part of its weight of phosphoric acid diluted with acetone. Other cellulose acetate solvents, or plasticizers, may be present. The ingredients are mixed thoroughly to form a fluid mass which is filtered if desired. For making lacquers, the proportion of solvent is increased and non-solvents such as benzene or alcohol may be added. The volatile solvent may be mixed with solvents of higher boiling point such as amyl alcohol, amyl acetate, and butyl acetate. It is preferred to employ 1/20 to 1/2 parts of phosphoric acid for every 100 parts of cellulose acetate. Photographic and other films made from these compositions are flexible, smooth, transparent and resistant to flame, the latter property increasing with time.ALSO:Cellulose acetate is mixed with phosphoric acid in the presence of a solvent or mixture of solvents to form practically non-inflammable films and other plastic bodies. Any of the phosphoric acids may be used such as ortho-, meta-, pyro-, or hypophosphoric acid. In an example, cellulose acetate dissolved in acetone is mixed with 1/500 part by weight of phosphoric acid diluted with acetone. Other cellulose acetate solvents or plasticizers may be present. The ingredients are mixed thoroughly to form a fluid mass which is filtered if desired. Non-solvents such as benzene or alcohol, and higher boiling point solvents such as amyl alcohol, amyl acetate, or butyl acetate may be present. It is preferred to employ 1/20 to 1/2 parts of phosphoric acid for every 100 parts of cellulose acetate. Films and other bodies made from these compositions are resistant to flame, this property increasing with time. |
