Process for the preparation of polyacetal copolymers

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

1995-08-31

1996-12-24

Acquah, Samuel A.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528242, 528248, 528249, 528487, 528488, 528492, 524745, 524787, 524795, C08G 400

Patent

active

055874495

ABSTRACT:
In the process for the preparation, with simultaneous end group stabilization, of polyacetal copolymers in a homogeneous 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.

REFERENCES:
patent: 3027352 (1962-03-01), Walling et al.
patent: 3803094 (1974-04-01), Ishii et al.
patent: 4111912 (1978-09-01), Sextro et al.
patent: 4431794 (1984-02-01), Sadlowski et al.
patent: 5144005 (1992-09-01), Sextro et al.

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