Production of polyoxymethylene and suitable catalysts

Details Production of polyoxymethylene and suitable catalysts Production of polyoxymethylene and suitable catalysts

2006-09-26

2006-09-26

Truong, Duc (Department: 1711)

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

Synthetic resins

From organic oxygen-containing reactant

C528S403000, C528S485000, C528S486000

Reexamination Certificate

active

07112651

ABSTRACT:
A process is described for preparing polyoxymethylene by contacting a formaldehyde source with a catalyst of the formula Iin-line-formulae description="In-line Formulae" end="lead"?[ML1aL2b]cm+Zc·m
n−  (I)in-line-formulae description="In-line Formulae" end="tail"?whereM is a metal of group VIII;L1is a ligand having at least one π-electron pair;each L2is independently tetrahydrofuran or a ligand which is displaceable by tetrahydrofuran;Z is an anion;a is 1 or 2;b is an integer from 0 to 4;c is 1 or 2; andm and n are integers from 1 to 4.

REFERENCES:
patent: 3305529 (1967-02-01), Reynolds
patent: 3457227 (1969-07-01), Kennedy
patent: 3506615 (1970-04-01), Chen
patent: 3804808 (1974-04-01), Ishii et al.
patent: 5089536 (1992-02-01), Palazzotto
patent: 1187233 (1970-04-01), None
patent: 94/09055 (1994-04-01), None

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