| 摘要 |
Polymer composition in a granular form having the ability to absorb and desorb water, comprising, firstly, a crosslinked polymeric substance which is insoluble but capable of swelling in water and, secondly, at least one pulverulent inorganic filler, well dispersed and intimately bound, characterised in that, for the purpose of increasing its capacity for absorbing and desorbing water, its resistance to photodegradation and its lifetime, it is composed:… a) of at least one polymer and/or copolymer prepared from at least one unsaturated ethylenic monomer containing at least one carboxylic amide, sulphuric, sulphonic, phosphoric, phosphonic or hydroxyl functional group,… b) of at least one inorganic filler intimately dispersed within the said polymer and/or copolymer by virtue of its being introduced into the mixture of monomers of the same kind or of different kinds before their polymerisation. …<??>This composition exhibits an improved resistance to photodegradation and a substantial increase in the number of water absorption and desorption cycles and an increased capacity for absorbing water in each cycle and for restoring it slowly into media where the said compositions are used. |
