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. 13, 2012
Filed:
Apr. 14, 2009
Michael Haubs, Bad Kreuznach, DE;
Michael Hoffmockel, Niedernhausen, DE;
Jürgen Lingnau, Mainz-Laubenheim, DE;
Robert Gronner, Erlanger, KY (US);
Michael Gene Yearwood, Bishop, TX (US);
Michael Haubs, Bad Kreuznach, DE;
Michael Hoffmockel, Niedernhausen, DE;
Jürgen Lingnau, Mainz-Laubenheim, DE;
Robert Gronner, Erlanger, KY (US);
Michael Gene Yearwood, Bishop, TX (US);
Ticona GmbH, Kelsterbach, DE;
Abstract
Oxymethylene copolymers having a high proportion of terminal alkyl ether groups and having terminal hydroxyalkylene groups are described. These polymers are distinguished by high thermal stability and high hot water resistance. Furthermore, a process for the preparation of oxymethylene copolymers is described in which the polymerization of at least one monomer forming —CH—O— units is effected in the presence of at least one acetal of formaldehyde and of at least one initiator of cationic polymerization and the initiator of cationic polymerization is used in an amount of less than or equal to 10mol %, based on the amount of the monomers present at the beginning of the polymerization and forming —CH—O— units, in which starting materials of the polymerization are used such that the content of water and formic acid at the beginning of the polymerization is less than or equal to 40 ppm, and in which the initiator and/or the active polymer chains are deactivated by treatment of the prepared polymer with a base-containing protic solvent.