Phthalic acid alkyl ester mixtures with controlled viscosity

Details Phthalic acid alkyl ester mixtures with controlled viscosity Phthalic acid alkyl ester mixtures with controlled viscosity

2002-09-20

2008-01-29

Anthony, Joseph D. (Department: 1714)

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

C560S076000, C106S316000, C524S296000, C524S297000, C252S182280

Reexamination Certificate

active

07323586

ABSTRACT:
Mixtures of isomeric dialkyl phthalates that have a desired viscosity are prepared by esterifying phthalic acid or phthalic anhydride with a mixture of isomeric alkyl alcohols having a certain carbon number of carbon atoms, where the molar fraction of each alkyl alcohol isomer of the isomeric alcohol mixture is determined, and where the viscosity parameter of each alkyl alcohol isomer of the alcohol mixture, which, upon reacting with phthalic acid or phthalic anhydride, results in a mixed isomer dialkyl phalate ester product having a specific desired viscosity, is determined in accordance with formula (I):in-line-formulae description="In-line Formulae" end="lead"?ln(η)=Σχi*ln(ηi)   (I)in-line-formulae description="In-line Formulae" end="tail"?where η=the calculated viscosity of a dialkyl phthalate mixture,χi=the molar fraction of an isomerically pure alcohol (i), andηi=the viscosity parameter of isomerically pure alcohol (i).

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