Process for preparing chlorinated polymer or copolymer of vinyl chloride
AssigneeTokuyama Sekisui Kogyo Kabushiki Kaisha
InventorsTerufumi Adachi, Tatsuro Oda
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Abstract
A process for preparing a chlorinated polymer or copolymer of vinyl chloride which comprises varying the amount of ultraviolet rays irradiated to a unit amount of the polymer or copolymer to control the reaction rate within the range from 0.75-0.25 mole/hour/kilogram of the polymer or copolymer until the rate of substitution of chlorine attains at least 1.6 moles/kilogram of the polymer or copolymer, the polymer or copolymer being chlorinated in an aqueous suspension under irradiation of ultraviolet rays. The polymers so produced have excellent thermal stability and excellent processability.
Claims5
A process for preparing a chlorinated polymer or copolymer of vinyl chloride which comprises varying the quantity of ultraviolet rays irradiated to a unit amount of the polymer or copolymer in accordance with the progress of the chlorination reaction to control the reaction rate within the range of from 0.75 -0.25 mole/hour/kilogram of the polymer or copolymer until the rate of substitution of chlorine attains at least 1.6 moles/kilogram of the polymer or copolymer, the polymer or copolymer being chlorinated in an aqueous suspension absent any solvent for the polymer or copolymer and under irradiation of ultraviolet rays.
Dependencies are inferred from the claim text.