Process for preparing polyacetal copolymer

Details Process for preparing polyacetal copolymer Process for preparing polyacetal copolymer

1997-01-27

1998-12-01

Truong, Duc

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

Synthetic resins

From aldehyde or derivative thereof as reactant

528234, 528239, 528243, 528245, 525154, 525398, 525403, 525405, 525406, 525427, C08G 600, C08G 200

Patent

active

058440593

ABSTRACT:
To prepare a thermally very stable polyacetal copolymer containing a very small amount of unstable parts in a high yield according to a simple process wherein an isopolyacid or an acid salt thereof is used as the polymerization catalyst in the copolymerization of trioxane as the principal monomer with a comonomer copolymerizable therewith, and wherein deactivation of the catalyst can be effected simply without fail through contact with a basic gas after polymerization without the necessity for any washing step. In the preparation of a polyacetal copolymer by the copolymerization of trioxane as the principal monomer with a cyclic ether or cyclic formal having at least one carbon--carbon bond as a comonomer, the copolymerization is effected using an isopolyacid or an acid salt thereof as the polymerization catalyst, followed by contact with a basic gas as a deactivator to deactivate the catalyst, and subsequent heat-melting treatment of the resulting crude polymer intact without washing thereof.

REFERENCES:
patent: 4931535 (1990-06-01), Yamamoto et al.
patent: 4956445 (1990-09-01), Yamamoto et al.

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