Powder binder soluble in pure aliphatic solvents for coating compositions

摘要

Novel pulverulent binders for paints, containing pulverulent, optionally multiphase polymer particles which comprise, at least at the particle surface, a copolymer comprising from 60 to 95% by weight of units of monomers which make the copolymer rigid and from 5 to 40% by weight of units of monomers which make the copolymer aliphatic-soluble, are soluble in pure, aromatic-free, aliphatic hydrocarbons. The monomers which make the copolymer rigid comprise not more than 60% by weight of isobutyl methacrylate and not less than 10% by weight of cycloalkyl methacrylates. The monomers which make the copolymer aliphatic-soluble comprise from 5 to 40% by weight of alkyl methacrylates having 6 to 18 carbon atoms in the alkyl radical. The copolymers may furthermore contain from 0.1 to 10% by weight of units of functional comonomers containing polar groups, for example hydroxyl groups, and from 0.1 to 2% by weight of a polyethylenically unsaturated, free-radical-polymerisable monomer.