Process for preparing polyacetal copolymer

Details Process for preparing polyacetal copolymer Process for preparing polyacetal copolymer

1996-08-15

1999-02-02

Reddick, Judy M.

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

Synthetic resins

From aldehyde or derivative thereof as reactant

525337, 525340, 525342, 525366, 525367, 525368, 525369, 525375, 525378, 525379, 525380, 525398, 528230, 528232, 528242, 528243, C08G 400

Patent

active

058666702

ABSTRACT:
A process for producing a polyacetal copolymer, which is extremely heat-stable and is extremely reduced in the quantity of unstable terminals even in a high polymerization yield in which trioxane as the principal monomer, comprises copolymerization of trioxane as the principal monomer with a cyclic ether or cyclic formal having at least one carbon-to-carbon bond as the comonomer by using a specific heteropoly-acid or acid salt thereof as a polymerization catalyst until the content of the remaining monomers is lowered to at most 10% by weight based on all the monomers fed, adding 0.01 to 10% by weight, based on the resulting crude polymer, of a solution containing a catalyst deactivator, or contacting a basic gas as the deactivator to deactivate the catalyst, and subjecting the crude polymer as such to heat melting treatment without washing thereof.

REFERENCES:
patent: 4931535 (1990-06-01), Yamamoto et al.
patent: 4956445 (1990-09-01), Yamamoto et al.
patent: 5395959 (1995-03-01), Weyer et al.
patent: 5500477 (1996-03-01), Reuschel et al.

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