SILICIC ESTER MODIFIED PHENOL/FORMALDEHYDE NOVOLAKS AND THEIR USE FOR THE PRODUCTION OF RESIN COATED SUBSTRATES

This invention relates to a resin preparable by reaction of a phenol/formaldehyde novolak with tetraethyl orthosilicate in a mass ratio above 28: 1, wherein the phenol of the phenol/formaldehyde novolak is substituted or unsubstituted hydroxybenzene or a mixture of two or more such phenols, and to a...

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Bibliographische Detailangaben
Hauptverfasser:	Marek TORBUS, Robert LAITAR, Douglas TRINOWSKI, Nicolas EGELER, Gae Ho BAE, Milan KNEZEVIC, Wolfgang SEELBACH
Format:	Patent
Sprache:	eng ; spa
Schlagworte:	CASTING CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS FOUNDRY MOULDING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS POWDER METALLURGY THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS
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Beschreibung
Zusammenfassung:	This invention relates to a resin preparable by reaction of a phenol/formaldehyde novolak with tetraethyl orthosilicate in a mass ratio above 28: 1, wherein the phenol of the phenol/formaldehyde novolak is substituted or unsubstituted hydroxybenzene or a mixture of two or more such phenols, and to a particulate material coated with said resin. Said particles can be used e.g. in the shell molding process for the production of shell molds and shell cores; and as proppants for use in the hydraulic fracturing process. Esta invención se relaciona con una resina que puede ser preparada por la reacción de un novolak de fenol/formaldehído con ortosilicato de tetraetilo en una relación en masa superior a 28:1, donde el fenol del novolak de fenol/formaldehído es hidroxibenceno sustituido o no sustituido o una mezcla de dos o más de esos fenoles, y con un material particulado recubierto con la resina. Las partículas pueden ser usadas por ejemplo en el proceso de moldeo por revestimiento para la producción de moldes revestidos y núcleos revestidos; y como soportes para usarse en el proceso de fracturamiento hidráulico.