US4518760A — Process for producing poly(dithiocarbamate) chela…

Claim 1

Independent Claim 63 words

A process for producing a poly(dithiocarbamate) resin chelating agent comprising: (a) dissolving a polyimine in an alcohol solvent to form a polyimine solution. (b) admixing a polyisocyanate in said polyimine solution to produce a cross-linked polyamine-polyurea precursor resin, and (c) reacting said cross-linked polyamine-polyurea precursor resin with a mixture of NH 4 OH and CS 2 to produce said poly(dithiocarbamate) resin chelating agent.

Claim 2

Dependent Claim 63 words

A process for producing a poly(dithiocarbamate) resin chelating agent comprising: (a) dissolving a polyimine in an alcohol solvent to form a polyimine solution. (b) admixing a polyisocyanate in said polyimine solution to produce a cross-linked polyamine-polyurea precursor resin, and (c) reacting said cross-linked polyamine-polyurea precursor resin with a mixture of NH 4 OH and CS 2 to produce said poly(dithiocarbamate) resin chelating agent.

Claim 3

Dependent Claim 51 words

The process of claim 1 in which said polyimine comprises a polymer of an alkeneimine having the general formula --CHRCH.sub.2 NH--.sub.x where R is H or an alkyl group having from 1 to about 4 carbon atoms, said polyimine having an average molecular weight of from about 1000 to about 100,000.

Claim 4

Dependent Claim 21 words

The process of claim 2 in which said polyisocyanate is selected from the group consisting of aromatic polyisocyanates and aliphatic diisocyanates.

Claim 5

Dependent Claim 30 words

The process of claim 3 in which said alcohol solvent is selected from the group consisting of aliphatic alcohols having from 1 to about 6 carbon atoms and benzyl alcohol.

Claim 6

Dependent Claim 37 words

The process of claim 4 in which said mixture of NH 4 OH and CS 2 has a volume ratio of NH 4 OH to CS 2 in the range of from about 1:1 to about 1:4.

Claim 7

Dependent Claim 25 words

The process of claim 5 in which said polyimine and said polyisocyanate are reacted for a period of from about 1 to about 30 minutes.

Claim 8

Dependent Claim 29 words

The process of claim 6 in which said polyisocyanate is admixed as a solution in an aliphatic ether having from 1 to about 6 carbon atoms in each chain.

Claim 9

Dependent Claim 13 words

The process of claim 7 in which said polyisocyanate is an aromatic polyisocyanate.

Claim 10

Dependent Claim 14 words

The process of claim 8 in which said alcohol solvent is an aliphatic alcohol.

Claim 11

Dependent Claim 20 words

The process of claim 9 in which said alkeneimine is selected from the group consisting of ethyleneimine, 2-methylethyleneimine, and 2-ethylethyleneimine.

Claim 12

Dependent Claim 24 words

The process of claim 10 in which said polyisocyanate is methylene diphenylisocyanate having the formula ##STR4## where n=0, 1, 2, 3, and mixtures thereof.

Claim 13

Dependent Claim 13 words

The process of claim 11 in which said polyimine is an aqueous suspension.

Claim 14

Dependent Claim 27 words

The process of claim 12 in which said polyimine is present in an amount of from about 1.5 to about 3.0 parts by weight of said polyisocyanate.

Claim 15

Dependent Claim 13 words

The process of claim 13 in which said allphatic ether is diethyl ether.

Claim 16

Dependent Claim 20 words

The process of claim 14 in which said polyimine has a molecular weight of from about 1,500 to about 80,000.

Claim 17

Dependent Claim 13 words

The process of claim 15 in which said aliphatic alcohol is isopropyl alcohol.

Claim 18

Dependent Claim 11 words

The process of claim 16 in which said polyimine is polyethyleneimine.

Claim 19

Dependent Claim 42 words

The process of claim 17 in which the amount of CS 2 present in said mixture of NH 4 OH and CS 2 is at least a stoichiometric amount equivalent to the amine groups present on the precursor resin available for substitution.

Claim 20

Dependent Claim 81 words

A process for producing a poly(dithiocarbamate) resin chelating agent comprising (a) dissolving a polyimine in an aliphatic alcohol solvent to form a polyimine solution, (b) admixing an aromatic polyisocyanate in said polyimine solution to produce a cross-linked polyamine-polyurea precursor resin in a reaction mixture, (c) separating said cross-linked polyamine polyurea precursor resin from said reaction mixture, and (d) reacting said cross-linked polyamine-polyurea precursor resin with a mixture of NH 4 OH and CS 2 to produce said poly(dithiocarbamate) resin chelating agent.

Claim 21

Dependent Claim 81 words

A process for producing a poly(dithiocarbamate) resin chelating agent comprising (a) dissolving a polyimine in an aliphatic alcohol solvent to form a polyimine solution, (b) admixing an aromatic polyisocyanate in said polyimine solution to produce a cross-linked polyamine-polyurea precursor resin in a reaction mixture, (c) separating said cross-linked polyamine polyurea precursor resin from said reaction mixture, and (d) reacting said cross-linked polyamine-polyurea precursor resin with a mixture of NH 4 OH and CS 2 to produce said poly(dithiocarbamate) resin chelating agent.

Claim 22

Dependent Claim 54 words

The process of claim 19 in which said polyimine is a polymer of an alkeneimine compound having the formula: --CHRCH.sub.2 NH--.sub.x where R is H or an alkyl group having from 1 to about 4 carbon atoms, said polyimine having an average molecular weight in the range of from about 1000 to about 100,000.

Claim 23

Dependent Claim 18 words

The process of claim 20 in which said aliphatic alcohol contains from 1 to about 3 carbon atoms.

Claim 24

Dependent Claim 32 words

The process of claim 21 in which said aromatic polyisocyanate is admixed as a solution comprised of an aliphatic ether solvent having from 1 to about 6 carbon atoms in each chain.

Claim 25

Dependent Claim 13 words

The process of claim 22 in which said aromatic polyisocyanate is toluene diisocyanate.

Claim 26

Dependent Claim 24 words

The process of claim 22 in which said aromatic polyisocyanate is methylene diphenylisocyanate having the formula ##STR5## where n=0, 1, 2 and mixtures thereof.

Claim 27

Dependent Claim 21 words

The process of claim 24 in which, following separation, said cross-linked polyamine-polyurea precursor resin is suspended in an aliphatic alcohol solvent.

Claim 28

Dependent Claim 30 words

The process of claim 25 in which said mixture of concentrated NH 4 OH and CS 2 has a volume ratio in the range from about 1:2.5 to about 1:3.5.

Claim 29

Dependent Claim 120 words

A poly(dithiocarbamate) resin chelating agent by the process which comprises: (a) preparing a precursor resin by (1) dissolving an aqueous suspension of a polyethyleneimine in an aliphatic alcohol solvent, (2) dissolving a polymethylene polyphenylisocyanate in an aliphatic ether solvent, (3) admixing said solutions to produce a cross-linked polyamine-polyurea precursor resin, (b) separating said precursor resin from said solvents in the reaction mixture, and (c) suspending said precursor resin in an aliphatic alcohol and reacting it with at least a stoichiometric amount of a mixture of concentrated NH 4 OH and CS 2 , said resin having a sulfur content of between about 6 and about 7 percent and an equivalent Cu +2 capacity of between about 1.5 and about 2.5.

Claim 30

Dependent Claim 120 words

A poly(dithiocarbamate) resin chelating agent by the process which comprises: (a) preparing a precursor resin by (1) dissolving an aqueous suspension of a polyethyleneimine in an aliphatic alcohol solvent, (2) dissolving a polymethylene polyphenylisocyanate in an aliphatic ether solvent, (3) admixing said solutions to produce a cross-linked polyamine-polyurea precursor resin, (b) separating said precursor resin from said solvents in the reaction mixture, and (c) suspending said precursor resin in an aliphatic alcohol and reacting it with at least a stoichiometric amount of a mixture of concentrated NH 4 OH and CS 2 , said resin having a sulfur content of between about 6 and about 7 percent and an equivalent Cu +2 capacity of between about 1.5 and about 2.5.

Claim 31

Dependent Claim 19 words

The process of claim 27 wherein said polyimine has a molecular weight of from about 1,500 to about 80,000.

Claim 32

Dependent Claim 22 words

The process of claim 28 wherein said aqueous polyimine suspension contains between about 40 and about 60 percent by weight of polyethyleneimine.

Claim 33

Dependent Claim 12 words

The process of claim 29 wherein said alcohol solvent is isopropyl alcohol.

Claim 34

Dependent Claim 16 words

The process of claim 30 wherein said isocyanate functionality is between about 2.0 and about 2.3.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-05-20	1988-11-19	1989-05-21	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-05-20	1992-11-19	1993-05-21	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-05-20	1996-11-19	1997-05-21	$7700.00	Window Closed / Lapsed

Process for producing poly(dithiocarbamate) chelating resins

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