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. 14, 2017
Filed:
Nov. 07, 2013
Sika Technology Ag, Baar, CH;
Christian Krüger, Schlieren, CH;
Jan Olaf Schulenburg, Uster, CH;
David Hofstetter, Winterthur, CH;
Tina Voci, Zürich, CH;
SIKA TECHNOLOGY AG, Baar, CH;
Abstract
A method is described for producing liquid rubber containing an impact-resistance modifier terminated by epoxy groups, the method including the reaction of an isocyanate-terminated prepolymer with an epoxy resin, which includes an epoxy compound including a primary or secondary hydroxyl group, in the presence of a compound selected from anhydrides, ketones and aldehydes as glycol scavengers, wherein the isocyanate-terminated prepolymer, the epoxy resin and the glycol scavenger are mixed with one another, or the epoxy resin is reacted with the glycol scavenger, before they are mixed with the isocyanate-terminated prepolymer. Gelling in the reaction mixture is avoided by the method. The resulting products are suitable for improving the impact resistance of epoxy resin compositions, particularly one-component or two-component epoxy resin adhesives.