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METHOD FOR PRODUCING O-PHTHALATE POLYESTER POLYOLS WITH LOW CYCLIC ESTER CONTENT
METHOD FOR PRODUCING O-PHTHALATE POLYESTER POLYOLS WITH LOW CYCLIC ESTER CONTENT
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机译:一种低环酯含量的邻苯二甲酸酯聚酯的制备方法
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摘要
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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