Production of acetal copolymers from gaseous formaldehyde...

Details Production of acetal copolymers from gaseous formaldehyde... Production of acetal copolymers from gaseous formaldehyde...

C - Chemistry, Metallurgy

08

G

402/104

C08G 2/22 (2006.01) C08G 16/02 (2006.01)

Patent

CA 2010653

ABSTRACT A process for producing oxymethylene copolymers and terpolymers is disclosed which involves the non-linear addition of gaseous formaldehyde to a cyclic ether having at least two. adjacent carbon atoms (1) and, in the case of a terpolymer, to a mixture of at least one (1) and one monoethylenically unsaturated aliphatic diol formal having at least four carbon atoms in its main chain (2), or to a mixture of (1) with a (2), in the presence of a polymerization initiator at a rate controlled so as to conform to a rate determined by kinetic equations that describe the rate of decomposition of trioxane to formaldehyde during conventional copolymerization of trioxane with a cyclic ether. The process and kinetic equations of the invention are applicable to batch reactions, single stream continuous reactions and dual stream continuous reactions.

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