Process for the preparation of polyacetal copolymers

Details Process for the preparation of polyacetal copolymers Process for the preparation of polyacetal copolymers

C - Chemistry, Metallurgy

08

G

C08G 2/24 (2006.01) C08G 2/00 (2006.01) C08G 2/28 (2006.01)

Patent

CA 2157456

In the process for the preparation, with simultaneous end group stabilization, of polyacetal copolymers in a homo- geneous phase and working up thereof, cyclic formaldehyde oligomers are copolymerized with cyclic acetals in the presence of an initiator in a polymerization reactor and immediately thereafter the initiator is deactivated by addition of basic substances, the unstable chain ends being degraded down to 0.01% to 1% in the presence of residual monomer, the product losing the majority of the residual monomer at the reactor outlet by letting down into a pelletizing device and the residual monomer which remains and the impurities dissolved in the product being removed by extraction with solvents and the product being pelletized, after drying and stabilization.

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