Composite materials

US6287639A · kind A · utility

Assignee

• Institut fuer Neue Materialien gemeinnuetzige GmbH · DE

Inventors

• Helmut Schmidt · Riegelsberg, DE
• Martin Menning · Quierschied, DE
• Gerhard Jonschker · Friedrichsthal, DE

Key dates

• Filing date: May 3, 1999
• Grant date: Sep 11, 2001
• Expiry date: May 3, 2019

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C03C2217/475
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A composite material is described which is characterized by a substrate and by a nanocomposite which is in functional contact with the substrate and is obtainable by surface modification of PA1 a) colloidal inorganic particles with PA1 b) one or more silanes of the general formula (I) EQU R.sub.x --Si--A.sub.4-x (I) PA2 where the radicals A are identical or different and are hydroxyl groups or groups which can be removed hydrolytically, except methoxy, the radicals R are identical or different and are groups which cannot be removed hydrolytically and x is 0, 1, 2 or 3, where x.gtoreq.1 in at least 50 mol % of the silanes; under the conditions of the sol-gel process with a below-stoichiometric amount of water, based on the hydrolysable groups which are present, with formation of a nanocomposite sol, and further hydrolysis and condensation of the nanocomposite sol, if desired, before it is brought into contact with the substrate, followed by curing, said substrate not being a glass or mineral fiber or a vegetable material.