Aqueous, pigmented coating material, especially for bituminous substrates, contains two copolymers with different glass transition temperatures, at least one with organo-silicon comonomer units

摘要

Aqueous, pigment-containing coating material with a film-forming component comprising two copolymers (A) and (B) with glass transition temperatures of +20 to +70 deg C (TgA) and -30 to +50 deg C (TgB) respectively, in which (A) and/or (B) contains 0.1-5.0 wt% organosilicon comonomer units and the values of TgA and TgB differ by at least 5 K. An aqueous, pigment-containing coating material with a pigment volume concentration (PVC) of 5-25, containing pigment(s) and/or filler(s) and the following film-forming components in dispersed form: (a) 30-90 parts by weight (pts. wt.) copolymer (A) with a Tg of +20 to +70 deg C (TgA) and (b) 10-70 pts. wt. copolymer (B) with a Tg of -30 to +50 deg C (TgB). Copolymer (A) and/or (B) contain(s) 0.1-5.0 wt% polymerized units of organosilicon compound(s) and the values of TgA and TgB differ by at least 5 K. An Independent claim is also included for a method for coating bituminous substrates with this material.