The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 1995
Filed:
Oct. 19, 1993
Applicant:
Inventors:
Klaus-Dieter Steffen, Hennef, DE;
Josef Metz, Marl, DE;
Assignee:
Huls Aktiengesellschaft, Marl, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
568591 ; 568592 ; 568594 ; 568605 ;
Abstract
Ketals of longer-chain or branched alcohols are prepared from dimethyl ketals or their ketones by reaction of the dimethyl ketals and the alcohols at high temperatures of 150.degree. to 180.degree. C. in the presence of acid catalysts. The enol ethers and mixed ketals which are separated by distillation are added to the next reaction batch and also react to form the target product. The starting material, dimethyl ketal, may also be formed during the reaction from the ketone and trimethyl orthoformate.