Acrylonitrile polymer solutions
AssigneeBayer Aktiengesellschaft
InventorsTheo Neukam, Francis Bentz, Gunther Nischk
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Abstract
This invention relates to the production of spinnable solutions of acrylonitrile homopolymers or acrylonitrile copolymers in which the polymerization is conducted in an organic solvent containing a catalyst system comprising an acid, e.g., sulfuric acid, a peroxodisulfate, e.g., ammonium peroxodisulfate, and a 1,3-diketone, e.g., acetyl acetone. Polymers having a good natural color and high K-values are obtained in good yields.
Claims17
A process for the production of a spinnable solution of acrylonitrile homopolymer or a copolymer of at least 90% by weight of acrylonitrile and up to 10% by weight of an unsaturated copolymerizable monomer which comprises polymerizing acrylonitrile or a mixture of acrylonitrile and an unsaturated copolymerizable monomer in an organic solvent in the presence of a catalyst system comprising an acid, a peroxodisulphate and a 1,3-diketone in which said acid is nitric acid, phosphoric acid, hydrochloric acid, sulphuric acid, benzene sulphonic acid, .alpha.-naphthalene sulphonic acid, .beta.-naphthalene sulphonic acid, 3-chlorobenzene sulphonic acid, 1,3-benzene disulphonic acid or oxalic acid;
- the molar ratio of peroxodisulphate to 1,3-diketone is 1.1.:1 to 1:3;
- to molar ratio of 1,3-diketone to acid is 1.2:1 to 3.2:1;
- and said acid and the amount thereof is such that the acrylonitrile polymer or copolymer produced is less colored and has a K-value higher than is obtained by the same process conducted without said acid.
Dependencies are inferred from the claim text.