| 摘要 |
A composition comprises an aqueous emulsion or solution in an organic solvent of (A) a copolymer of 60-99.5% of at least one ethylenically unsaturated compound and 0.5-40% of an ethylenically unsaturated carboximide which is not substituted on the nitrogen, and (B) 0.25-20% referred to (A) of a cross-linking agent for the copolymer which is hexamethylene tetramine or an addition compound thereof. The copolymer may be derived from (a) acrylic or methacrylic acid or ester thereof, e.g. the methyl, ethyl and butyl esters, and (b) maleimide. The cross-linking agent may be the addition compound of hexamethylene tetramine with chloral. The copolymers are prepared by copolymerizing the monomers in aqueous emulsion, e.g. using a polyoxy-ethylated nonyl phenol sulphonate and a polyoxy ethylated mixture of oleyl and cetyl alcohols, or in organic solvent, e.g. acetone, methyl ethyl ketone, using as catalyst azobis-isobutyro-nitrile, benzoyl peroxide or ammonium persulphate, and then adding the cross-linking agent. The composition may be applied to a substrate, the organic solvent or water is evaporated and the composition is then hardened by curing at 70-160 DEG C. for 2-60 minutes. |
