Acrylonitrile polymerization in fluorinated hydrocarbons
AssigneeBayer Aktiengesellschaft
InventorsCarlhans Suling, Siegfried Korte, Theo Neukam
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Abstract
The invention relates to a process for the production of polyacrylonitrile or acrylonitrile copolymers, the polymerization being carried out at a temperature of from -40.degree. to +60.degree. C. optionally under pressure in an aliphatic chlorofluorine or fluorine substituted hydrocarbon containing up to 8 carbon atoms and having a boiling point of from -60.degree. to +50.degree. C. or in mixtures thereof having boiling ranges of from -60.degree. to +50.degree. C. and using a starter system comprising a hydroperoxide sulphur dioxide and an acid. The system may also contain aliphatic hydrocarbons in such quantities that a non-inflammable mixture is formed.
Claims7
A process for the production of polyacrylonitrile or acrylonitrile copolymers, which comprises polymerizing acrylonitrile alone or with up to 30% by weight of at least one ethylenically unsaturated comonomer at a temperature of from -40.degree. to +60.degree. C., in an aliphatic chloro-fluorine- or fluorine-substituted hydrocarbon containing up to 8 carbon atoms and having a boiling point of -60.degree. to +50.degree. C. or in mixtures thereof having boiling ranges of from -60.degree. to +50.degree. C. and using a starter system consisting of from 0.1 to 0.3 mole % of a hydroperoxide, from 0.1 to 12 mole % of sulphur dioxide and from 0.01 to 1.0 mole % of a partially halogenated or perhalogenated carboxylic acid containing up to 10 carbon atoms (based on the total amount of monomers used), polymerization being continued up to conversions of from 30 to 90% by weight.
Dependencies are inferred from the claim text.