Process for the preparation of polymers and copolymers based on vinyl chloroformate
AssigneeSociete Nationale des Poudres et Explosifs
InventorsSylvie L. Boileau, Gilles F. Meunier, Sabine M. Journeau
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Abstract
The invention relates to a process for the synthesis of polymers from vinyl chloroformate. The reaction is preferably carried out at between 15.degree. and 40.degree. C., in the presence of 0.01 to 2 mol % of a cycloaliphatic percarbonate, relative to the vinyl chloroformate. The resulting homopolymers and copolymers are useful, in particular, as transparent materials and reactive support polymers which can be used in the pharmaceutical, photographic or foodstuffs industry and also in the manufacture of dyestuffs.
Claims14
A process for the synthesis of essentially colourless, transparent copolymers of vinyl chloroformate and a vinylic monomer capable of undergoing free radical polymerization, said copolymers having number average molecular weight of 8000-100,000, said vinylic monomer being a member selected from the group consisting of acrylonitrile, methyl methacrylate, styrene, vinyl chloride and vinyl acetate, which copolymer contains 0.5-50% of said chloroformate and 50-99.5% of said vinylic monomer, which consists of reacting a mixture of vinyl chloroformate and said vinylic monomer with an initiator, which is an aliphatic or cycloaliphatic percarbonate and wherein said percarbonate has the formula:
- ##STR3## in which R.sub.1 and R.sub.2 are the same or different and are a linear or branched alkyl containing from 3 to 8 carbon atoms or cyclohexyl.
An essentially colorless, transparent copolymer consisting essentially of vinyl chloroformate and a vinylic monomer which is a member selected from the group consisting of acrylonitrile, methyl methacrylat, styrene, vinyl chloride and vinyl acetate which contains 0.5-50% of said chloroformate and 50-99.5% of said vinylic monomer, of number average molecular weight of 8000-100,000 which is prepared by reacting vinyl chloroformate and said vinylic monomer in the presence of an initiator which is an aliphatic or cycloaliphatic percarbonate and wherein said percarbonate has the formula:
- ##STR4## in which R.sub.1 and R.sub.2 are the same or different and are a linear or branched alkyl containing from 3 to 8 carbon atoms or cyclohexyl and isolating said copolymer from the reaction mixture.
Dependencies are inferred from the claim text.