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US 2026/0286036 A1Published application
Low residual momomer glycol aromatic polyester polyols
AssigneeStepan Company
InventorsCarina ARAULLO-MCADAMS, Carson CLINE, Lei CUI
Life of this patent
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Abstract
An aromatic polyester polyol comprising: a total product OH value of 150 to 450; a viscosity of less than 12,000 cps; an OH value from residual monomer glycols of <30% of the total product OH value; residual monomer glycols in an amount of less than 10 wt %; and a level of 1,4 dioxanes less than 50.
Claims28
An aromatic polyester polyol comprising:
- a total product OH value of 150 to 450;
- a viscosity of less than 12,000 cps;
- an OH value from residual monomer glycols of <30% of the total product OH value
- residual monomer glycols in an amount of less than 10 wt %;
- and
- a level of 1,4 dioxanes less than 50 ppm.
3 more elements
A process comprising of:
- feeding a feed stream comprising a glycol stream and an aromatic stream comprising at least one of aromatic esters and acids, and a catalyst stream to a reactor where:
- the glycol stream is selected from monoethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, higher glycols, dipropylene glycol, methylpropandiol higher molecular weight polyethylene glycols and polypropylene glycols, higher functionality glycols such as glycerine, trimethylolpropane, pentaerythritol, glucosides and alkylsubstituted glucosides or combinations thereof;
- and
- the aromatic acids/ester is selected from terepthalic acid, isophthalic acids, phthalic acids/anhydrides, trimellitic anhydrides and corresponding esters, or combinations thereof,
- reacting the feed stream in the reactor, thereby forming an intermediate product stream comprising aromatic polyester polyols having a total product OH value greater than 250, residual monomer glycols, water, and optionally 1, 4 dioxanes;
- and
- separating the residual monomer glycol in the intermediate stream by a thermal separation process under vacuum into a glycol enriched overhead stream and a product stream having a total product OH value of less than 450, a viscosity of less than 12000 cps;
- and a level of residual monomer glycols at a level of less than 10 wt %.
5 more elements
An aliphatic polyester polyol or a mixed aliphatic/aromatic polyester polyol comprising:
- a total product OH value of <120;
- a viscosity of less than 20,000 cps;
- an OH value from residual monomer glycols of <5% of the total product OH value;
- and
- residual monomer glycols in an amount of less than 1 wt %.
2 more elements
Dependencies are inferred from the claim text.