Production of acetal copolymers from gaseous formaldehyde and cy

Details Production of acetal copolymers from gaseous formaldehyde and cy Production of acetal copolymers from gaseous formaldehyde and cy

1989-03-20

1990-12-04

Kight, III, John

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528233, 528241, 528244, 528245, 528248, 528250, 525398, 525400, 525405, 522162, C08G 400

Patent

active

049755200

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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