Dynamit Nobel Aktiengesellschaft

Ute Klapdor

Jurgen Amort

Horst Hanisch

Hendrikus Van Der Maas

Hermann Peeters

Hans P Suerken

Hans-Peter Suerken

Disclosed is a casting resin of reduced viscosity based on methacrylic acid esters with a high content of aluminum hydroxide as filler containing a mixture of at least one organosilicon compound with a functional group, at least one silicic acid ester, and at least one organic metallic acid compound of metals of Groups IVB and/or VB of the Periodic Table of the Elements. The functional group of the organosilicon compound is ethylenically unsaturated and bound to the silicon atom either directly or by alkylene groups. The casting resins of the invention have improved working qualities. Plastic objects and moldings manufactured from these resins have decidedly improved use properties.

Aluminum hydroxide filled casting resins on a basis of methacrylic acid

The present invention is in the modification of starch by silanes and is performed by bringing the starch into intimate contact with the hydrolyzates of the silanes in the presence of alkali aluminates or alkali hydroxides. Preferably this is done in the aqueous solution of the silane hydrolyzate, in which case the additives can be used either in aqueous solution or in solid form. The aluminate or alkali hydroxide is present at least in such an amount that 0.4 mol of aluminate will be present for each mole of silane. The modification is possible not only with alkyl alkoxysilanes, but also with organofunctional alkoxysilanes. The starch modified with the silanes has better practical properties than corresponding unmodified starch and can be used, for example, for the hydrophobation and oleophobation of cellulosic material.

Method for the modification of starch in an aqueous medium

A method for the modification of starch by silanes wherein the starch and silane are contacted in an organic solvent in the presence of a metallic acid ester of a metal of groups IVB or VB of the Periodic Table of the elements. The resulting suspension is stirred. The subsequently separated starch exhibits better working characteristics than the corresponding unmodified starch.

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Troisdorf, Germany

Ute Klapdor