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:
Jul. 05, 2016
Filed:
Nov. 18, 2011
Peter Kuhlmann, Wülfrath, DE;
Reinhardt Winter, Wülfrath, DE;
Jan Geraedts, Roggel, NL;
ASHLAND-SUDCHEMIE-KERNFEST GMBH, Hilden, DE;
Abstract
The present invention relates to a process for the production of coated proppants, proppants obtainable by such a process, uses thereof and processes using the proppants. The process for the production of coated proppants comprises the following steps: (a) mixing a proppant with a polyol component and an isocyanate component, wherein the polyol component consists of a phenolic resin and optionally one or more other hydroxy group—containing compounds, wherein the isocyanate component consists of an isocyanate having at least 2 isocyanate groups and optionally one or more other isocyanate group—containing compounds, and (b) curing the mixture obtained in step (a) by treatment with a catalyst; and (c) optionally repeating steps (a) and (b) one or more times, wherein the mixture obtained in the preceding step (b) or the proppant isolated therefrom is used as a proppant in step (a), wherein the polyol component in step (a) is the same as or different from the polyol component used in the previous step (a), and wherein the isocyanate component in step (a) is the same as or different from the isocyanate component used in the previous step (a).