Scratch- and abrasion-resistant coatings on polymeric surfaces

A composition, comprising:

• a) at least one reaction product of
• a1) a silane of the formula:
• in which
• Y(1)=3-glycidyloxypropyl-, and
• R1, R2, R3=like or unlike alkyl groups having 1 to 6 carbon atoms,
• a2) a silane of the formula:
• in which
• Y(2)=NH2(CH2)2NH(CH2)2NH(CH2)3 and
• R′1, R′2, R′3=like or unlike alkyl groups having 1 to 6 carbon atoms, and
• a3) a silane of the formula:
• in which Y(3) is selected from fluoro-, methacryloyl-, vinyl- and mercapto-, and
• R″1, R″2, R″3 are the same or different alkyl groups having 1 to 6 carbon atoms;
• b) at least one inorganic filler selected from the group consisting of SiO2, TiO2, ZnO, Al2O3, BaSO4, CeO2, ZrO2, and mixtures thereof;
• c) a solvent having a boiling point at a temperature <85° C.;
• d) water;
• e) a catalyst selected from the group consisting of an organic acid and an inorganic acid;
• and
• f) at least one film-forming binder selected from the group consisting of a melamine resin, an acrylate, and a mixture thereof, in an amount from 0.001% to 15% by weight, and/or
• g) an epoxy resin in an amount from 0.001% to 15% by weight,
• wherein the specified amount in f) and g) is based on the total weight of the composition, and with the proviso that the sum of the weight fractions of the components a) to g) equals 100%.

A composition, comprising:

• a) at least one reaction product of
• a1) a silane of the formula:
• in which
• Y(1)=3-glycidyloxypropyl-, and
• R1, R2, R3=like or unlike alkyl groups having 1 to 6 carbon atoms,
• a2) a silane of the formula:
• in which
• Y(2)=NH2(CH2)2NH(CH2)2NH(CH2)3, and
• R′1, R′2, R′3=like or unlike alkyl groups having 1 to 6 carbon atoms, and
• a3) a silane of the formula:
• in which Y(3) is selected from fluoro-, methacryloyl-, vinyl- and mercapto-, and
• R″1, R″2, R″3 are the same or different alkyl groups having 1 to 6 carbon atoms;
• b) at least one inorganic filler;
• c) a solvent having a boiling point at a temperature <85° C.;
• d) water;
• and
• e) a catalyst selected from the group consisting of an organic acid and an inorganic acid.