| 摘要 |
The fluid contains homopolymer or copolymer particles which contain water and are dispersed in an electrically non-conductive, oil-like medium, but no polyhydric alcohols. The polymer, which has a maximum density of 1.8 g/cm<3>, contains free and/or neutralised acid groups and has such an adsorption capability for water that, after drying to a constant weight, it again absorbs a considerable proportion of the quantity of water lost, from the surrounding air. The water absorption of polymers having acid groups is considerably greater than that of polymers without acid groups, and the electroviscous effect of fluids containing polymer particles having acid groups is thus increased by up to three times in comparison with fluids without polymer particles having acid groups.
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