| 摘要 |
1331688 Electrodeposition coating compositions GLASURIT-WERKE M WINKELMANN GmbH 1 July 1971 [10 Aug 1970] 30914/71 Heading C3P [Also in Division C7] Compositions for producing textured coatings on metal surfaces by electrophoretic deposition comprise: (I) 59-70% by weight of a thermosetting copolymer of (a) 50-90% by weight of at least one ester of acrylic and/or methacrylic acid with a straight or branched chain saturated aliphatic monoalcohol having 1-8 carbon atoms, (b) 1-15% by weight of a copolymerizable olefinically unsaturated carboxylic acid having 3-5 carbon atoms and (c) 5-49% by weight of at least one other copolymerizable olefinically unsaturated monomer; (II) 10- 25% by weight of a finely divided copolymer with a softening temperature of over 100‹ C. and a mean particle diameter of from 0À01-2 microns, which is a copolymer of (a) 60-95% by weight of styrene, (b) 0À5-10% by weight of an acid as defined for I(b), and (c) 4À5-30% by weight of at least one other copolymerizable monomer; and (III) 15-20% by weight of a plasticizer which is compatible with components I and II and which has a boiling point above 150‹ C., the polymer elements of the composition being at least partly in the form of their alkali metal, ammonium and/or amine salts and being finely dispersed in an aqueous medium, the weight percentages of components I, II and III being based on the total weight thereof. The acid monomer in each of componets I and II may be acrylic, methacrylic, itaconic, citraconic, mesaconic or maleic acid, half-esters of the stated dicarboxylic acids, or maleic anhydride. The other monomer (c) in components I and II may be a vinyl ester, styrene or a substituted styrene, e.g. vinyl toluene or p-chlorostyrene, (meth)acrylonitrile, (math)acrylamide and methylol or methylol ether derivatives thereof, and esters and half-esters of polyhydrie alcohols, e.g. glycols, with (math)acrylic acid. Useful plasticizers III include alkyl esters of phthalic, isophthalic, terephthalic, adipic, sebacic, glycolic, tartaric, citric and ricinoleic acids; alkylphthalylalkyl glycolates; acetyltrialkyl citrates; castor oil; alkyl esters of lauric, stearic and oleic acids; octanol and higher alkanols; glycols and glycol ethers; and glycerine. Optional components may also be present, e.g. pigments such as soot, titanium dioxide, iron oxide, phthalocyanines, silicates, quartz and talcum, and also phenolic resins, maleinized alkyd resins, maleinized oils, other (meth)acrylate polymers, antifoaming agents, flow improving agents, stabilizers, antioxidants and organic solvents. The copolymers used in the examples are prepared by polymerizing (a) t-butyl acrylate, n. butyl acrylate, acrylamide N-methylol isobutyl ether, acrylic acid and butanediol monoacrylate in isobutanol in the presence of azodiisobutyronitrile and t-dodecyl mercaptan and (b) acrylic acid, styrene, acrylonitrile and methacrylonitrile in aqueous emulsion in the presence of sodium octadecane-sulphonate and potassium persulphate. |
