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:
Feb. 15, 2005
Filed:
Apr. 25, 2002
Donald Edward Putzig, Newark, DE (US);
Edward Francis Mcbride, Wilmington, DE (US);
Clive Alexander Hamilton, Stokesley, GB;
Andrea Clare Smith, Houghton-le Spring, GB;
Donald Edward Putzig, Newark, DE (US);
Edward Francis McBride, Wilmington, DE (US);
Clive Alexander Hamilton, Stokesley, GB;
Andrea Clare Smith, Houghton-le Spring, GB;
E. I. du Pont de Nemours and Company, Wilmington, DE (US);
Abstract
A process that can be used as catalyst in esterification, transesterification or polycondensation is disclosed, which comprises a stable solution comprising (a) titanium in the form of a titanium α-hydroxycarboxylic acid or its salt, (b) a C-Ccarboxylic acid, and (c) zinc in the form of a water-soluble zinc salt, and (d) water. Also disclosed is an esterification, transesterification or polycondensation process, which comprises contacting, in the presence of the solution process, an organic acid or its ester or its salt with an alcohol, optionally in the presence of a phosphorus compound, an organic or inorganic toning agent such as cobalt acetate, or combinations thereof. The process can also comprise combining aqueous solutions of a titanium α-hydroxycarboxylic acid or its salt and a zinc salt in an alcohol to produce an alcohol solution contacting the alcohol solution with a mixture comprising organic acid or its ester or its salt and a second alcohol, or comprise combining an aqueous solutions of a titanium α-hydroxycarboxylic acid or its salt and aqueous solution of a zinc salt with the mixture.