| 摘要 |
A mixture of 50-80 parts by weight of a vinyl aryl monomer, 50-20 parts by weight of an aliphatic conjugated diolefine and 0.25-4.0 parts by weight of at least one ethylenically unsaturated acid is emulsion polymerized in an aqueous medium in the presence of 0.5-6.0 parts of ortho-phosphoric acid. Exemplified are copolymers of styrene and butadiene with acrylic, fumaric and itaconic acid. The latices formed, when mixed with industrial primer pigment pastes containing such ingredients as calcium molybdate, iron oxide, barium sulphate, clay, water-soluble resins, titanium dioxide, potassium aluminium silicate and carbon black, are improved primers for phosphatized steel.ALSO:Metal, especially phosphatised steel, is coated with an aqueous primer composition based on a copolymer of 50-80 parts of a vinyl aryl monomer, 50-20 parts of an aliphatic conjugated diolefin, and 0.25-4.0 parts of at least one ethylenically unsaturated acid that has been formed by emulsion polymerisation of the monomers in the presence of 0.5 to 6.0 parts of orthophosphoric acid. The exemplified copolymers are of styrene, butadiene, and one or more of acrylic, fumaric, and itaconic acids. Other ingredients of the composition include titanium dioxide, barium sulphate, potassium aluminium silicate, carbon black, calcium molybdate, iron oxide, clay, water soluble resins, emulsifiers and thickeners, and air drying catalysts. |
