| 摘要 |
<p>1466735 Aqueous polymer dispersions A E STALEY MFG CO 23 April 1974 [1 May 1973] 17650/74 Heading C3P Aqueous polymer dispersions comprising (a) a continuous aqueous external phase consisting essentially of the water-soluble amic salts of an adduct of an unsaturated glyceride oil and at least one alpha, betaethylenically unsaturated dicarboxylic acid or anhydride neutralized with sufficient aqueous nitrogen base to provide a water-soluble amic salt product having a pH within the range 7 to 10, and (b) a non-continuous internal phase of particles of polymerized monovinyl aromatic compound of average particle size less than 0À4 micron uniformly dispersed within the external phase, the dispersion containing 1 to less than 4 parts external phase solids for each 6 parts by weight of internal phase solids, the total solids of said internal and external phases being at least 40 weight per cent of the dispersion and the remaining non-solids consisting essentially of water, and the dispersion containing less than 0À7 weight per cent of monovinyl aromatic monomer, are suitable for use as printing ink vehicles and as overprint varnishes, and may be prepared by initiating polymerization of monovinyl aromatic monomer dispersed in an aqueous medium containing said adduct salt, optionally with conventional surfactants and dispersing agents, and adding further monomer and polymerization catalyst incrementally during polymerization to obtain a dispersion with an adduct/polymer weight ratio of 1 : 3 to 2 : 3. The preferred vinyl aromatic monomer is styrene. Many suitable materials are specified and examples describe printing inks and overprint varnishes comprising aqueous dispersions prepared by polymerizing styrene in the presence of an adduct of linseed oil and maleic anhydride converted to amic salt with ammonia using tbutyl hydroperoxide and erythorbic acid as catalyst.</p> |
