Method for producing ο-phthalate polyester polyols with low cyclic ester content

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United States of America Patent

PATENT NO 9487467
APP PUB NO 20140018458A1
SERIAL NO

14004887

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Abstract

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A method for producing a polyester polyol is disclosed. The method comprises reacting phthalic anhydride with a diol selected from the group consisting of ethylene glycol, propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, neopentyl glycol, 1,6-hexanediol, polyethylene glycols having a number average molecular weight within the range of 200 g/mol to 600 g/mol, and mixtures thereof at a diol to phthalic anhydride molar ratio within the range of 1.1 to 1.6. The resulting o-phthalate polyester polyol has a hydroxyl value in the range of 18 to 400 mg KOH/g, an acid value in the range of 0.2 to 5.0 mg KOH/g, and 1 wt. % or less of cyclic esters.

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Patent Owner(s)

  • STEPAN COMPANY

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Guo, Andrew Wilmette, US 8 325
Hillshafer, Douglas Western Springs, US 1 2

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