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. 24, 2020
Filed:
Apr. 19, 2016
Sika Technology Ag, Baar, CH;
Martin Schmider, Hamburg, DE;
SIKA TECHNOLOGY AG, Baar, CH;
Abstract
A two-stage method for producing a polyurethane hot-melt adhesive, having the stages of A) reacting at least one polyol with at least one diisocyanate, the NCO/OH ratio being greater than 1.5, in order to obtain a reaction mixture containing an isocyanate-functional polyurethane prepolymer and non-converted diisocyanate and B) reacting the reaction mixture obtained in stage A), the mixture containing the isocyanate-functional polyurethane prepolymer and non-converted diisocyanate, with at least one polyester polyol, the NCO/OH ratio being greater than 3. The obtained hot-melt adhesive can be formulated as an R-40 classification-free and storage- and processing-stable PUR-RHM with a residual monomer content below 1 wt. % and has a good initial strength.