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AssigneeLeibniz-Institut Fuer Polymerforschung Dresden E.V.
InventorDieter LEHMANN
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The invention pertains to the fields of chemistry and mechanical engineering and relates to glass fiber surfaces which are modified without sizing material and silane, which glass fiber surfaces can be further processed into and used as composite materials, for example as reinforcing fiber materials for plastics, and to a method for producing the modified glass fiber surfaces. The object of the present invention is to provide glass fiber surfaces modified without sizing materials and silane, which glass fiber surfaces exhibit improved properties overall and for a further processing into composite materials, and furthermore to provide a simple and cost-effective method for producing glass fiber surfaces modified in such a manner. The object is attained with glass fiber surfaces modified without sizing material and silane, which glass fiber surfaces are at least partially covered at least with a hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte and/or hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte mixture and/or with a hydrolysis-stable and/or solvolysis-stable polyelectrolyte complex and coupled to the glass fiber surface via a (polyelectrolyte) complex formation process by means of ionic bonding, with the polyelectrolyte complex A thereby being formed.
Glass fiber surfaces modified without sizing material and silane, which glass fiber surfaces are at least partially covered at least with a hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte and/or hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte mixture and/or a hydrolysis-stable and/or solvolysis-stable polyelectrolyte complex and coupled to the glass fiber surface via a (polyelectrolyte) complex formation process by means of ionic bonding, thereby forming the polyelectrolyte complex A.
Composite materials with glass fibers having glass fiber surfaces modified without sizing material and silane, in which composite materials hydrolysis-stable and/or solvolysis-stable polyelectrolyte complexes A and/or B, which are present in an at least partially covering manner on glass fiber surfaces without sizing material and silane and which comprise functional groups and/or olefinically unsaturated double bonds, are present such that they are coupled via a chemically covalent bond with additional materials after a reaction with functional groups and/or olefinically unsaturated double bonds.
A method for producing glass fiber surfaces modified without sizing material and silane, in which method a hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte and/or a hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte mixture and/or a hydrolysis-stable and/or solvolysis-stable polyelectrolyte complex with an excess of cationic charges is applied from an aqueous solution at a concentration of maximally 5 wt % to the glass fiber surfaces in an at least partially covering manner during or after the production of glass fibers, wherein hydrolysis-stable and/or solvolysis-stable cationic polyelectrolytes and/or hydrolysis-stable and/or solvolysis-stable cationic polyelectrolyte mixtures with a molecular weight under 50,000 dalton and/or a hydrolysis-stable and/or solvolysis-stable polyelectrolyte complex with an excess of cationic charges are used.
Dependencies are inferred from the claim text.