Preparation of etherified polyoxyalkylene derivatives
AssigneeKuraray Co., Ltd.
InventorsNoriaki Yoshimura, Masuhiko Tamura
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Abstract
Polyoxyalkylene compounds having at least four oxyalkylene units and one or two terminal hydroxyl groups are etherified by reacting same with organic primary chlorides or bromides in the presence of an aqueous, at least 30% by weight solution of sodium or potassium hydroxide to produce the corresponding etherified polyoxyalkylene derivatives. The molar ratio of the organohalide to the hydroxyl group(s) of the polyoxyalkylene compound is at least 1.2, and the molar ratio of the alkali metal hydroxide to such hydroxyl group(s) is at least 1.
Claims35
A process for preparing an etherified polyoxyalkylene derivative having the structural formula:
- ##STR17## wherein m and n are zero or numbers greater than zero, m and n not being both zero, such that m+n.gtoreq.4;
- Q is a member selected from the group consisting of --OCH.sub.2 R, --OR.sup.1, --N(CH.sub.2 R)R.sup.2, --N(CH.sub.2 R)COR.sup.2, --NR.sup.2 R.sup.3, --N(R.sup.3)COR.sup.2, ##STR18## R is hydrogen or --CR.sup.4 R.sup.5 R.sup.6 ;
- R.sup.1, R.sup.2 and R.sup.3 are the same or different and are each a hydrocarbon;
- R.sup.4, R.sup.5 and R.sup.6 are each hydrogen or a hydrocarbon;
- and p and q are each zero or numbers greater than zero such that p+q>0, which process consists essentially of reacting in a single step a polyoxyalkylene compound having the structural formula:
- ##STR19## wherein Q' is Q as defined above or a member selected from --OH, --NHR.sup.2, --NHCOR.sup.2, ##STR20## and m, n, R.sup.2, p and q are as previously defined, with an organic halide having the structural formula:
- R--CH.sub.2 --X [III]
- wherein X is chlorine or bromine atom and R is as previously defined, in the presence of an aqueous solution of sodium or potassium hydroxide having an initial alkali metal hydroxide concentration of from about 30% to about 75% by weight, and at a molar ratio of the said organic halide to hydroxyl content of the said polyoxyalkylene compound of at least 1.2 and at a molar ratio of the said alkali metal hydroxide to hydroxyl content of the said polyoxyalkylene compound of at least 1.
Dependencies are inferred from the claim text.