Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
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.
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Kanehira Ikuhiko
Nakaoka Hiroshi
Okabe Kazuaki
Hodogaya Chemical Co. Ltd.
Oblon, Spivak McClelland, Maier & Neustadt, L.L.P.
Sergent Rabon
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