Randomly segmented thermoplastic polyurethanes as matrix for electrochemical analysis of Ca.sup.++ ions
First Claim
1. A composition, comprising in homogeneous distributionA) at least one salt containing a lipophilic anion,B) a plasticiser-free thermoplastic randomly segmented polyurethane which is soluble in organic solvents, a polyurea or a polyurethane urea, which components are formed froma) 5-45% by weight of an aromatic, cycloaliphatic or linear aliphatic diisocyanate,b) 0-20% by weight of a linear or branched C2 -C12 alkylenediol or C2 -C12 alkylenediamine,c) 0-75% by weight of a polytetrahydrofuran or aminopropyl-terminated polytetrahydrofuran,d) 0-10% by weight of a polyethylene glycol or aminopropyl-terminated polyethylene glycol,e) 0-75% by weight of a polypropylene glycol or aminopropyl-terminated polypropylene glycol, which composition containsf) 15-95% by weight of a hydroxy-, hydroxypropyl- or aminopropyl-terminated polydimethylsiloxane, the percentages relating to the amount of polymer, and the sum of components a) to f) being 100, andC) a nonionic ionophore which forms a complex with Ca++ ions.
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Abstract
Composition, comprising in homogeneous distribution A) at least one salt containing a lipophilic anion, B) a plasticiser-free thermoplastic randomly segmented polyurethane which is soluble in organic solvents, a polyurea or a polyurethane urea, which components are formed from a) 5-45% by weight of an aromatic, cycloaliphatic or linear aliphatic dilsocyanate, b) 0-20% by weight of a linear or branched C2-C12alkylenediol or C2-C12alkylenediamine, c) 0-75% by weight of a polytetrahydrofuran or aminopropyl-terminated polytetrahydrofuran, d) 0-10% by weight of a polyethylene glycol or aminopropyl-terminated polyethylene glycol, e) 0-75% by weight of a polypropylene glycol or aminopropyl-terminated polypropylene glycol, which composition contains f) 15-95% by weight of a hydroxy-, hydroxypropyl- or aminopropyl-terminated polydimethylsiloxane, the percentages relating to the amount of polymer, and the sum of components a) to f) being 100, and C) a nonionic ionophore which forms a complex with Ca++ ions. The invention also relates to an electrode for calcium analysis, containing said composition in the form of a membrane, to a process for the electrochemical analysis of Ca++ ions in solution as well as to the use of this composition for the electrochemical analysis of Ca++ ions.
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Citations
35 Claims
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1. A composition, comprising in homogeneous distribution
A) at least one salt containing a lipophilic anion, B) a plasticiser-free thermoplastic randomly segmented polyurethane which is soluble in organic solvents, a polyurea or a polyurethane urea, which components are formed from a) 5-45% by weight of an aromatic, cycloaliphatic or linear aliphatic diisocyanate, b) 0-20% by weight of a linear or branched C2 -C12 alkylenediol or C2 -C12 alkylenediamine, c) 0-75% by weight of a polytetrahydrofuran or aminopropyl-terminated polytetrahydrofuran, d) 0-10% by weight of a polyethylene glycol or aminopropyl-terminated polyethylene glycol, e) 0-75% by weight of a polypropylene glycol or aminopropyl-terminated polypropylene glycol, which composition contains f) 15-95% by weight of a hydroxy-, hydroxypropyl- or aminopropyl-terminated polydimethylsiloxane, the percentages relating to the amount of polymer, and the sum of components a) to f) being 100, and C) a nonionic ionophore which forms a complex with Ca++ ions.
Specification