| abstract |
The invention is crosslinked carboxyl containing hydrophilic resin crosslinked by a compound corresponding to formula 1, R1-(O(CH(R3)CH(R3)O)y-C(O)-R2)x wherein: R1 is independently is each occurrence a C2-10 straight or branched chain alkyl moiety; R2 is independently is each occurrence a C2-10 straight or branched chain alkenyl moiety; R3 is independently in each occurrence hydrogen or methyl; x is independently in each occurrence 2 or greater where x is 2; y is independently in each occurrence 3 to 8, and where x is 3 or greater, y is independently in each occurrence 2 to 7. In another embodiment, the invention is a process for the preparation of crosslinked hydrophilic resins which comprises A) contacting one or more ethylenically unsaturated carboxylic acids, acid arthydrides, and optionally one or more known comonomers with a crosslinking compound of formula 1 in an aqueous medium, optionally in the presence of a free radical or redox catalyst system, under conditions such that a crosslinked hydrophilic resin is prepared. Optionally, the properties of the crosslinked hydrophilic resin are enhanced by heating the crosslinked hydrophilic resin under conditions such that the crosslinked hydrophilic resin exhibits a centrifuge capacity 25 (g/g) or greater, an absorption under load of 25 g/g or greater, and a ratio of absorption under load to centrifuge capacity of 0.6 or greater. |