Brominated ester-containing polyols
AssigneeTexaco Development Corporation
InventorHoward Paul Klein
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Abstract
Brominated ester-containing polyether polyols are prepared by the sequential reaction of a polyether polyol with 4,5-dibromohexahydrophthalic anhydride or its corresponding diacid and an alkylene oxide. The resulting polyols are particularly useful in the preparation of flame-retardant polyurethane foams.
Claims11
A brominated ester-containing polyether polyol prepared by reaction of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin and mixtures thereof and a half-ester in a ratio of said oxide to said half-ester such that said oxide is present in an amount sufficient to reduce the acid number of said brominated ester-containing polyether polyol to 10 ml KOH/g or less and, wherein said half-ester is formed by the reaction of
- a. a polyether polyol prepared by the addition of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide and mixtures thereof to a polyhydric compound selected from the group consisting of ethylene glycol, propylene glycol, the isomeric n-butylene glycols, 1,5-pentanediol, 1,6-hexanediol, glycerol, trimethylolpropane, 1,2,6-hexanetriol, sorbitol, sucrose, alpha-methyl glycoside, pentaerythritol, phosphorus acids and phosphorus acid esters having at least one reactive OH, and
- b. 4,5-dibromohexahydrophthalic anhydride or its corresponding acid, wherein the mole ratio of polyether polyol (a) to 4,5-dibromohexahydrophthalic anhydride or its corresponding acid (b) is from 2:3 to about 3:1.
A process for the preparation of a brominated ester-containing polyether polyol which comprises sequentially contacting
- a. a polyether polyol formed by the addition of an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide and mixtures thereof to a polyhydric compound selected from the group consisting of ethylene glycol, propylene glycol, the isomeric n-butylene glycols, 1,5-pentanediol, 1,6-hexanediol, glycerol, trimethylolpropane, 1,2,6-hexanetriol, sorbitol, sucrose alpha-methyl glucoside, pentaerythritol, phosphorus acids and phosphorus acid esters, and
- b. 4,5-dibromohexahydrophthalic anhydride or its corresponding diacid thereby to form the half-ester of said 4.5-dibromohexahydrophthalic anhydride, wherein the mole ratio of said polyether polyol (a) to 4,5-dibromohexahydrophthalic anhydride (b) is from about 2:3 to about 3:1, and
- c. thereafter contacting said half-ester substantially free of the anhydride with an alkylene oxide selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide epichlorohydrin and mixtures thereof, thereby to esterify the half-ester to the ester-containing polyether polyol, wherein alkylene oxide is employed in an amount sufficient to reduce the acid number of the ester-containing polyether polyol to less than about 10 mg. KOH/gram.
A process for the preparation of a brominated ester-containing polyether polyol which comprises sequentially contacting
- a. a polyhydric alcohol selected from the group consisting of ethylene glycol, propylene glycol, the isomeric n-butylene glycols, 1,5-pentanediol, 1,6-hexanediol, glycerol, trimethylolpropane and 1,2,6-hexanetriol, and
- b. 4,5-dibromohexahydrophthalic anhydride or its corresponding diacid thereby to form the half-ester of said 4,5-dibromohexahydrophthalic anhydride, wherein the mole ratio of said polyhydric alcohol is approximately 1:1 and
- c. thereafter contacting said half-ester substantially free of the anhydride with an alklene oxide selected from the group consisting of ethylene oxide, propylene oxide, butylene oxide, epichlorohydrin and mixture thereof in an amount sufficient to form a polyether polyol from the polyhydric moiety, said polyether polyol moiety having a molecular weight of from about 300 to about 10,000 and to reduce the acid number of the thus formed ester-containing polyether polyol to less than about 10 mg. KOH/gram.
Dependencies are inferred from the claim text.