Silicon-containing chelating composition and method therefor
AssigneeDow Corning Corporation
InventorEdwin P. Plueddemann
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Abstract
New organosiloxane chelating compositions comprising a siliceous support and an organosiloxane chelating agent bonded to its surface are disclosed. A new method for preparing the composition comprises contacting the siliceous support with a solution of an organosiloxane comprising units of the formula ##STR1## AND OPTIONALLY, UNITS OF THE FORMULA ##STR2## R is --CH.sub.2 COOH or --CH.sub.2 COO.sup.- M.sup.+ ; M.sup.+ is an alkali metal ion, m = 0 or 1, a = 0 or 1, b = 1 or 2, (m.multidot.a) + b is at least 2 and Z is a monovalent hydrocarbon radical having 1 to 6 inclusive carbon atoms.
Claims17
A composition comprising a siliceous support having bonded to the surface thereof an organosiloxane consisting essentially of at least 50 mol percent of
- A. siloxane units having the formula ##STR8## wherein R is --CH.sub.2 COOH or --CH.sub.2 COO.sup.- M.sup.+, M.sup.+ is an alkali metal anion, m is 0 or 1, a is 0 or 1 and b is 1 or 2, the total of (m.multidot.a) + b having a value of at least 2;
- and up to 50 mol percent of
- B. siloxane units having the formula
- O.sub.3 /.sub.2 SiZ
- wherein Z is a monovalent hydrocarbon radical having from 1 to 6 inclusive carbon atoms, the total of (A) and (B) being 100 mol percent.
A solution comprising a solvent and an organosilicon solute dissolved in said solvent, said solvent being selected from the group consisting of water and common organic solvents, said organosilicon solute consisting essentially of at least 50 mol percent of
- I. organosilicon compounds having the formula ##STR9## or hydrolyzates thereof, wherein Q is a lower alkoxy radical, R is --CH.sub.2 COOH or --CH.sub.2 COO.sup.- M.sup.+, M.sup.+ is an alkali metal ion, m is 0 or 1, a, is 0 or 1, b is 1 or 2, the total of (m.multidot.a) + b having a value of at least 2, and up to 50 mol percent of
- Ii. organosilicon compounds having the formula
- Q.sub.3 SiZ
- or hydrolyzates and cohydrolyzates thereof, wherein Q is a lower alkoxy radical and Z is a monovalent hydrocarbon radical having from 1 to 6 inclusive carbon atoms, the total of (I) and (II) being 100 mol percent.
Dependencies are inferred from the claim text.