| 摘要 |
Organic solvent systems, such as inks, contain as thickener an addition polymer of hydrophobic and hydrophilic monomers (especially copolymers of isobutyl methacrylate and one or more acids selected from acrylic acid, methacrylic acid, and itaconic acid) in weight ratios of hydrophobic to hydrophilic monomer of between about 99.9:0.1 and 90:10. The weight average molecular weight range of the polymer is from 100,000-2,000,000 and the glass transition temperature Tg is >/=30 DEG C. At least 60% by weight of the hydrophilic monomer (S) should be such as to form homopolymers having a solubility parameter not greater than 8.8. The polymers are preferably prepared by emulsion polymerisation. |
