Polymeric dithiocarbamate acid salt compositions and method of use

  • US 5,500,133 A
  • Filed: 02/17/1995
  • Issued: 03/19/1996
  • Est. Priority Date: 02/17/1995
  • Status: Expired due to Fees
First Claim
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1. A method for precipitating contaminants from an aqueous solution comprising adding to said solution an amount effective for the purpose of a complexing composition comprising a water soluble, branched polydithiocarbamic acid salt having the formula:

  • ##STR5## wherein R1 independently is an organic radical or;

    ##STR6## wherein R4 is independently an organic radical and x=1 to 5;

    at least a percentage of R2 is --CS2 R5 and the remainder is --H;

    R5 is independently H or a cation;

    R3 is N or a substituted organic radical;

    Z is independently N--R2, O or S;

    the sum of n is an integer greater than 10; and

    m is an integer greater than 2 so as to complex, precipitate and remove metal contaminants from said aqueous solution, said polydithiocarbamic acid salt being formed by reaction of epihalohydrin with a mixture of an amine compound consisting of at least two primary amine functional groups and an amine compound consisting of three primary amine functional groups, then functionalization with carbon disulfide.

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