Patent · US Expired

Phthalic acid alkyl ester mixtures with controlled viscosity

US7323586B2 · kind B2 · utility

8Cited by

32References

26Claims

0Family size

Assignee

OXENO OLEFINCHEMIE GMBH · DE

Inventors

Klaus-Diether Wiese · Haltern am See, DE
Michael Grass · Bend, US
Wilfried Bueschken · Haltern, DE

Key dates

Filing date	Sep 20, 2002
Grant date	Jan 29, 2008
Priority date	—
Expiry date	Sep 20, 2022

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC10N2070/00
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

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):ln(η)=Σχi*ln(ηi) (I)where η=the calculated viscosity of a dialkyl phthalate mixture,

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.