(JP9511541-W)      Absorption agent for aq. acids or lyes comprises weakly crosslinked polycationic homo- or co-polymers of quaternary, monoethylenically unsatd. carboxylic acid derivs. of formula:    (CH2=C(R1)-CO-X-(CH2)n-C(R2R3)-CH2-N+(R4R5R6)Y (I)    In formula (I), R1 = H or Me; R2, R3 = H or 1-4C alkyl; R4, R5, R6 = 1-4C alkyl; n = 0 or 1; X = O or NH; and Y = an anionic acid residue such as monoalkyl sulphate, hydrogen sulphate or chloride.    The copolymers may comprise up to 70 wt.% of nonionic monomers of formula    CH2=C(R1)Z (II) and/or    CH2=C(R1)COX(CH2)nC(R2R3)CH2N(R4R6) (III)    based on the total amt. of monomers (I), (II) and (III). The polymers are prepd. in aq. soln. by chemical catalysis with radical formers or with UV light. The absorption agent has a grain size of spectrum. 50-5000 (esp. 100-2000) microns. Additional conventional, porous, organic and/or inorganic materials and.or fibres may be mixed with the polymer product.    In formulae (II) and (III), R1 - R6 are as described above; X = as described above; and Z = CON(R1R2), COO(CH2)nC(R2R3)CH2OH or CN.    USE -   The absorption agents may be used to take up, e.g. sodium lyes, potassium lyes, ammonium chloride solns., amine solns., H2SO4, HCl, HNO3, H3PO4, acetic acid, acrylic acid, crotonic acid or alkyl-sulphonic acids. Due to their ability to absorb sulphuric acid, they may be used in lead accumulators.    ADVANTAGE -   The agents are capable of absorbing several times their own wt. of strong acids or bases.    (EP756606-B1)      Absorption agent for aq. acids or lyes comprises weakly crosslinked polycationic homo- or co-polymers of quaternary, monoethylenically unsatd. carboxylic acid derivs. of formula:    (CH2=C(R1)-CO-X-(CH2)n-C(R2R3)-CH2-N+(R4R5R6)Y (I)    In formula (I), R1 = H or Me; R2, R3 = H or 1-4C alkyl; R4, R5, R6 = 1-4C alkyl; n = 0 or 1; X = O or NH; and Y = an anionic acid residue such as monoalkyl sulphate, hydrogen sulphate or chloride.    The copolymers may comprise up to 70 wt.% of nonionic monomers of formula    CH2=C(R1)Z (II) and/or    CH2=C(R1)COX(CH2)nC(R2R3)CH2N(R4R6) (III)    based on the total amt. of monomers (I), (II) and (III). The polymers are prepd. in aq. soln. by chemical catalysis with radical formers or with UV light. The absorption agent has a grain size of spectrum. 50-5000 (esp. 100-2000) microns. Additional conventional, porous, organic and/or inorganic materials and.or fibres may be mixed with the polymer product.    In formulae (II) and (III), R1 - R6 are as described above; X = as described above; and Z = CON(R1R2), COO(CH2)nC(R2R3)CH2OH or CN.    USE -   The absorption agents may be used to take up, e.g. sodium lyes, potassium lyes, ammonium chloride solns., amine solns., H2SO4, HCl, HNO3, H3PO4, acetic acid, acrylic acid, crotonic acid or alkyl-sulphonic acids. Due to their ability to absorb sulphuric acid, they may be used in lead accumulators.    ADVANTAGE -   The agents are capable of absorbing several times their own wt. of strong acids or bases.    (DE4412153-C2)      Absorption agent for aq. acids or lyes comprises weakly crosslinked polycationic homo- or co-polymers of quaternary, monoethylenically unsatd. carboxylic acid derivs. of formula:    (CH2=C(R1)-CO-X-(CH2)n-C(R2R3)-CH2-N+(R4R5R6)Y (I)    In formula (I), R1 = H or Me; R2, R3 = H or 1-4C alkyl; R4, R5, R6 = 1-4C alkyl; n = 0 or 1; X = O or NH; and Y = an anionic acid residue such as monoalkyl sulphate, hydrogen sulphate or chloride.    The copolymers may comprise up to 70 wt.% of nonionic monomers of formula    CH2=C(R1)Z (II) and/or    CH2=C(R1)COX(CH2)nC(R2R3)CH2N(R4R6) (III)    based on the total amt. of monomers (I), (II) and (III). The polymers are prepd. in aq. soln. by chemical catalysis with radical formers or with UV light. The absorption agent has a grain size of spectrum. 50-5000 (esp. 100-2000) microns. Additional conventional, porous, organic and/or inorganic materials and.or fibres may be mixed with the polymer product.    In formulae (II) and (III), R1 - R6 are as described above; X = as described above; and Z = CON(R1R2), COO(CH2)nC(R2R3)CH2OH or CN.    USE -   The absorption agents may be used to take up, e.g. sodium lyes, potassium lyes, ammonium chloride solns., amine solns., H2SO4, HCl, HNO3, H3PO4, acetic acid, acrylic acid, crotonic acid or alkyl-sulphonic acids. Due to their ability to absorb sulphuric acid, they may be used in lead accumulators.    ADVANTAGE -   The agents are capable of absorbing several times their own wt. of strong acids or bases.