Production of polyoxymethylene and suitable (II) catalysts

Details Production of polyoxymethylene and suitable (II) catalysts Production of polyoxymethylene and suitable (II) catalysts

2006-06-20

2006-06-20

Truong, Duc (Department: 1711)

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

Synthetic resins

From aldehyde or derivative thereof as reactant

C528S230000, C528S425000, C528S403000, C528S485000, C528S486000

Reexamination Certificate

active

07064177

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"?[CpvMLw]m+Zm
n−  (I)in-line-formulae description="In-line Formulae" end="tail"?whereM is Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Mn, Re, Fe, Ru, Os, Co, Rh or Ir,Cp is a cyclopentadienyl ligand C5H(5-u)R1u, whereu is from 0 to 5 andR1is alkyl, alkenyl, aryl, heteroaryl, aralkyl, COOR2, COR2, CN or NO2, andR2is H, alkyl, aryl or aralkyl,v is 1 or 2,each L is independently a nitrile, CO or a ligand displaceable by CO,w is an integer from 0 to 4,Z is an anion, andm and n are each independently an integer from 1 to 3.

REFERENCES:
patent: 3457227 (1969-07-01), Kennedy
patent: 1187233 (1970-04-01), None
patent: 94/09055 (1994-04-01), None
F. Edelmann et al., “Übergangsmetall-Fulven-Komplexe”,Journal of Organometallic Chemistry, vol. 309, 1986, pp. 87-108.
Chaloyard et al., “Synthesis of Ring-Substituted Derivatives of Cyclopentadienyl Tricarbonyl Complexes of Molybdenum and Tungsten”,Inorganic Chemistry, vol. 19, 1980, 3217-3220.

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