Method for producing polyether-polyol having narrow...

Details Method for producing polyether-polyol having narrow... Method for producing polyether-polyol having narrow...

2003-12-19

2011-11-08

Sergent, Rabon (Department: 1765)

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

C528S405000, C528S408000, C528S417000, C528S487000, C528S488000, C528S494000, C528S499000, C568S621000, C568S623000, C568S624000

Reexamination Certificate

active

08053607

ABSTRACT:
A method for producing a polyether-polyol having a narrow molecular weight distribution, which comprises carrying out selective fractional extraction of the low-molecular weight component from a polyether-polyol (A) having an average molecular weight of from 500 to 4500 represented by formula (1):in-line-formulae description="In-line Formulae" end="lead"?HO—[(CH2)4O]n—[(CR1R2)pO]q—H  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein R1and R2, which may be the same or different, each represents a hydrogen atom or a linear or branched alkyl group having from 1 to 5 carbon atoms; n indicates a positive integer; p indicates an integer of from 1 to 8; and q indicates 0 or a positive integer, by the use of an aqueous solution (C) containing from 15 to 70 wt % sulfuric acid at a room temperature to 100° C., to thereby suitably determine the amount of the aqueous sulfuric acid solution to the overall organic layer and the sulfuric acid concentration in accordance with the molecular weight and molecular weight distribution of the intended polyether-polyol to be fractionally extracted.

REFERENCES:
patent: 4209641 (1980-06-01), Masuda et al.
patent: 4371713 (1983-02-01), Matsumoto et al.
patent: 57-47687 (1982-10-01), None
patent: 3352702 (2002-12-01), None
patent: WO 02/02669 (2002-01-01), None
L. C. Case, Makromol. Chem., vol. 41, pp. 61-76, “Fractionation of Polymers Using Simple and Counter-Current Liquid-Liquid Equilibration”, 1960.
P. R. Johnston, Journal of Applied Polymer Science, vol. 9, pp. 467-470, “Poly(Oxatetramethylene) Glycol. II. Molecular Weight Distribution”, 1965.
Patent Abstracts of Japan; JP 60-042421, Mar. 6, 1985.

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