Process for the chlorination of vinyl polymers

Details Process for the chlorination of vinyl polymers Process for the chlorination of vinyl polymers

1970-02-17

1977-02-01

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

526 42, 526227, 526230, 526344, 20415918, C08F 820

Patent

active

040061264

ABSTRACT:
A process for chlorinating vinyl polymers, especially vinyl chloride polymers (i.e. homopolymers and copolymers having a chlorine content of less than about 56.5% by weight) to increase the chlorine content (to a level preferably in excess of 60% by weight), wherein the vinyl chloride polymer is mixed in a powdered state with a minor proportion (in terms of the total mixture) of at least one chloroalkane (preferably 10 to 55 parts by volume in cm.sup.3 per 100 parts by weight in grams of polymer and more generally 10 parts by weight to 85 parts by weight of the chloroalkane per 100 parts by weight of the polymer), and then chlorinating the mixture with molecular chlorine (Cl.sub.2) at a temperature below the vetrification or vitreous-transistion temperature (second-order glass-transition temperature) of the polymer. The reaction can be carried out in the presence of small quantities of at least one free-radical-producing catalyst of the peroxide type (preferably tertiary-butylperpivalate or di-isopropylperoxidecarbonate) or in the presence of U.V. light. The polymer powder contains maximum of 0.2% by weight water; and the chloroalkane is trichloromethane (chloroform), tetrachloromethane (carbon tetrachloride), 1,1-dichloroethane and 1,2-dichloroethane.

REFERENCES:
patent: 3535220 (1970-10-01), Kato
patent: 3597342 (1971-08-01), De Vita et al.

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