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OwnerKlaus Heinemann, Eberhard Taeger +2inventors
InventorsKlaus Heinemann, Eberhard Taeger, Erich Meusel, Wolfgang Mueller
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This invention relates to the use of organophilic, swellable specially modified phyllosilicates in the production of nano-reinforced thermoplastic polymers, preferably polyamides, polyesters and polycarbonates. The inorganic phyllosilicate particles are bonded to or incorporated into the polymer in a covalent manner with nanodistribution. Special modification enables the phyllosilicates to be used as initiators in the case of polymerization or a chain elements in the case of condensation. The covalent bonding of the phyllosilicate particles to the polymer increases the stability of the reinforcing effect as opposed to an ionic bond. The special modification is performed for phyllosilicates which become hydrophobic as a result of cationic exchange. This property makes it possible for certain organic reaction partners to reach reactive groups present on the surface of the phyllosilicate and to react therewith on certain conditions. As a result of the functional groups containing organically modified phyllosilicats arising from the reaction, they are able to form stable, covalent bonds with the polymers.
A process for producing nano-reinforced thermoplastic polymers, especially polyamides, polyesters or polycarbonates or copolymers thereof, comprising covalent bonding to or direct incorporation of modified sheet-silicates in nano distribution, wherein the hydroxyl groups on the surface of the sheet-silicates rendered organophilic by ion exchange are esterified with at least one compound selected from the group consisting of carboxylic acids, carboxylic anhydrides and anhydrido-bearing liquid-crystalline polyesterimide anhydrides.
Dependencies are inferred from the claim text.