PROBLEM TO BE SOLVED: To provide an aqueous gel hardly reducing gel strength even in co-presence of salt and satisfying flexibility and mechanical strength at the same time.SOLUTION: There is provided an aqueous gel by gelatinizing a polymer component containing a polymer A by polymerizing a monomer component containing a betaine monomer represented by the formula (I) and a polymer B by polymerizing a monomer component containing an acid monomer having an alkyl group, an aryl group, an aralkyl group, a carboxyl group or an amino group having a sulphonate group or a neutralized group thereof or a phosphate group or a neutralized group thereof. (I), R1 is H or an alkyl group, R2 is an alkylene group, an arylene group, an aralkylene group, a -COO- group or a -CONH- group, R3 and R4 are alkyl group and R5 is an alkylene group.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2017,JPO&INPIT【課題】塩の共存下でもゲル強度が低下しがたく、柔軟性および機械的強度を同時に満足する水性ゲルの提供。【解決手段】式(I)で表わされるベタインモノマーを含有するモノマー成分を重合させてなるポリマーA、及びスルホン酸基もしくはその中和された基、リン酸基もしくはその中和された基を有するアルキル基、アリール基、アラルキル基、カルボキシル基またはアミノ基を有する酸性モノマーを含有するモノマー成分を重合させてなるポリマーBを含有するポリマー成分をゲル化させてなる水性ゲル。(R1はH又はアルキル基;R2はアルキレン基、アリーレン基、アラルキレン基、-COO-基又は-CONH-基、R3およびR4はアルキル基、R5はアルキレン基)【選択図】図1
