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. 08, 2005
Filed:
Apr. 24, 2001
Sabine Oepen, Ellerstadt, DE;
Michael Breulmann, Mannheim, DE;
Norbert Güntherberg, Speyer, DE;
Klaus-dieter Hungenberg, Birkenau, DE;
Norbert Niessner, Friedelsheim, DE;
Bernhard Czauderna, Hirschberg, DE;
Wil Duijzings, Ludwigshafen, DE;
Sabine Oepen, Ellerstadt, DE;
Michael Breulmann, Mannheim, DE;
Norbert Güntherberg, Speyer, DE;
Klaus-Dieter Hungenberg, Birkenau, DE;
Norbert Niessner, Friedelsheim, DE;
Bernhard Czauderna, Hirschberg, DE;
Wil Duijzings, Ludwigshafen, DE;
BASF Aktiengesellschaft, Ludwigshafen, DE;
Abstract
A polybutadiene latex is prepared by a process in which butadiene is polymerized by free radical emulsion polymerization in the presence of initiator and, if required, dispersants and further conventional assistants, the polymerization being carried out in the presence of reactive comonomers in such a way that the heat flow of 43 watt/kg solids content of the polymerization mixture is not exceeded. Owing to the presence of reactive comonomers, the reaction rate at the beginning of the reaction is increased, with the result that an overall flatter heat flow profile is obtained. A preferred reactive comonomer is styrene. Preferably, the process is carried out by a semi-batch procedure in which