Process for the preparation of specific polyethylene glycol di (2-(4-chloro-2-methylphenoxy)-propionic acid ester mixtures
AssigneeBayer Aktiengesellschaft
InventorsLutz Heuer, Heinz-Joachim Rother, Volker Glock
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Abstract
The present invention relates to an-economically and ecologically advantageous process, which is easy to carry out, for the preparation of specific polyethylene glycol diesters of 2-(4-chloro-2-methylphenoxy)-propionic acid, and to the substance mixture obtainable by this process and the use thereof as a root penetration inhibitor in building materials and insulating compositions, such as, for example, bitumen.
Claims14
Process for the preparation of polyethylene glycol esters of 2-(4-chloro-2-methylphenoxy)-propionic acid by reaction of polyethylene glycols with 2-(4-chloro-2-methylphenoxy)propionic acid, characterized in that the reaction is carried out with a mixture of polyethylene glycols having a molecular weight distribution of 170 to 230 and which mixture contains less than 0.1% by weight mono- and less than 0.1% by weight diethylene glycol, at temperatures of 155.degree.-195.degree. C.
Dependencies are inferred from the claim text.