Article for the selective removal of hydrogen cyanide from tobacco smoke

Claim 2

An improved tobacco smoke filter comprising a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II) with a polydentate amine of the general formula NH 2 --(R--NH) x --H where R is methylene or ethylene and x is an integer from 1 to 10, said complex having an octahedral crystallographic structure, and said complex being dispersed on a carrier therefor effective to provide an intimate exposure of said complex to a tobacco smoke stream containing HCN drawn through said filter, the amount of said complex being sufficient to remove selectively at least a portion of HCN from said tobacco smoke stream.

Claim 3

A tobacco smoke filter according to claim 1 wherein said complex is formed from a water-soluble zinc salt in combination with a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 4

A tobacco smoke filter according to claim 1 wherein said complex is formed from a water-soluble copper salt in combination with a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 5

A tobacco smoke filter according to claim 1 wherein said complex is formed from a water-soluble nickel salt in combination with a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 6

A tobacco smoke filter according to claim 1 wherein said complex is formed from a water-soluble iron (II) salt in combination with a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 7

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with the fibrous base material of a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II), and an amine of the general formula NH 2 (R--NH) x --H wherein R is methylene or ethylene and x is an integer from 1 to 10, said comlex having an octahedral crystallographic structure, and said complex being present in an amount between about 1 and 8 mgs of metal ion in said filter effective to absorb selectively at least a portion of any HCN produced upon combustion of said shredded tobacco.

Claim 8

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with the fibrous base material of a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II), and an amine of the general formula NH 2 (R--NH) x --H wherein R is methylene or ethylene and x is an integer from 1 to 10, said comlex having an octahedral crystallographic structure, and said complex being present in an amount between about 1 and 8 mgs of metal ion in said filter effective to absorb selectively at least a portion of any HCN produced upon combustion of said shredded tobacco.

Claim 9

An improved filter tip cigarette according to claim 6 wherein said complex is formed from the combination of a water-soluble zinc compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 10

An improved filter tip cigarette according to claim 6 wherein said complex is formed from the combination of a water-soluble copper compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 11

An improved filter tip cigarette according to claim 6 wherein said complex is formed from the combination of a water-soluble nickel compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 12

An improved filter tip cigarette according to claim 8 wherein said complex is formed from the combination of a water-soluble iron compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 13

An improved tobacco smoke filter comprising the combination of (i) a complex formed from a metal ion selected from the group consisting of zinc, copper, nickel and iron with acetylacetone or polydentate amine having not more than about 10 nitrogen atoms, and (ii) a synergist therefor which is a polyoxyalkylene of the general formula R' (XOH).sub.a or R'N.sub.b (XOH).sub.2b wherein R' is a saturated hydrocarbon radical containing from 2 to 6 carbon atoms, and X is a polymeric chain of the formula --[OR.sup.2 ].sub.z -- R 2 being an alkylene radical having from 2 to 3 carbon atoms, a being 2 to 3 and b being 1 or 2 in said filter, said complex and said polyoxyalkylene compound being dispersed on a carrier therefor which is effective to provide an intimate exposure of said complex and said polyoxyalkylene to tobacco smoke containing HCN drawn through said filter; the amount of said polyoxyalkylene compound being between about 2 and about 10 parts for each part of said metal ion; and the amount of said metal ion present in the said filter being effective to remove at least a portion of the HCN contained in said tobacco smoke.

Claim 14

An improved tobacco smoke filter comprising the combination of (i) a complex formed from a metal ion selected from the group consisting of zinc, copper, nickel and iron with acetylacetone or polydentate amine having not more than about 10 nitrogen atoms, and (ii) a synergist therefor which is a polyoxyalkylene of the general formula R' (XOH).sub.a or R'N.sub.b (XOH).sub.2b wherein R' is a saturated hydrocarbon radical containing from 2 to 6 carbon atoms, and X is a polymeric chain of the formula --[OR.sup.2 ].sub.z -- R 2 being an alkylene radical having from 2 to 3 carbon atoms, a being 2 to 3 and b being 1 or 2 in said filter, said complex and said polyoxyalkylene compound being dispersed on a carrier therefor which is effective to provide an intimate exposure of said complex and said polyoxyalkylene to tobacco smoke containing HCN drawn through said filter; the amount of said polyoxyalkylene compound being between about 2 and about 10 parts for each part of said metal ion; and the amount of said metal ion present in the said filter being effective to remove at least a portion of the HCN contained in said tobacco smoke.

Claim 15

An improved tobacco smoke filter according to claim 11 wherein said polyoxyalkylene compound has a molecular weight between about 300 and 1,000 and is a liquid at room temperature.

Claim 16

An improved tobacco smoke filter according to claim 12 wherein said complex is formed from a polydentate amine of the formula NH.sub.2 (R--NH).sub.x --H wherein R is methylene or ethylene and x is an integer from 1 to 10; and said metal is a water-soluble salt of zinc, copper or nickel.

Claim 17

An improved tobacco smoke filter according to claim 13 wherein said complex has an octahedral crystalographic structure.

Claim 18

A tobacco smoke filter according to claim 13 wherein said complex is formed from a water-soluble salt of zinc in combination with the polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 19

A tobacco smoke filter according to claim 13 wherein said complex is formed from a water-soluble salt of copper in combination with the polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 20

A tobacco smoke filter according to claim 13 wherein said complex is formed from a water-soluble salt of nickel in combination with the polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 21

A tobacco smoke filter according to claim 13 wherein said complex is formed from a water-soluble salt of iron (II) in combination with the polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 22

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with said firbous material of (i) a complex formed from a metal ion selected from the group consisting of zinc, copper, nickel and iron with acetylacetone or a polydentate amine having not more than about 10 nitrogen atoms, and (ii) a synergist therefor which is a polyoxyalkylene of the general formula R' (XOH).sub.a or RN.sub.b (XOH).sub.2b wherein R' is a saturated hydrocarbon radical containing from 2 to 6 carbon atoms, and X is a polymeric chain of the formula --[OR.sup.2 ].sub.z -- R 2 being an alkylene radical having from 2 to 3 carbon atoms, a being 2 or 3 and b being 1 or 2, in said filter the amount of said polyoxyalkylene compound being present in an amount between 2 and 10 parts for each part of said metal ion; and the amount of said metal ion being between about 0.2 and 4 mg, sufficient to remove at least a portion of any HCN produced upon combustion of said tobacco.

Claim 23

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with said firbous material of (i) a complex formed from a metal ion selected from the group consisting of zinc, copper, nickel and iron with acetylacetone or a polydentate amine having not more than about 10 nitrogen atoms, and (ii) a synergist therefor which is a polyoxyalkylene of the general formula R' (XOH).sub.a or RN.sub.b (XOH).sub.2b wherein R' is a saturated hydrocarbon radical containing from 2 to 6 carbon atoms, and X is a polymeric chain of the formula --[OR.sup.2 ].sub.z -- R 2 being an alkylene radical having from 2 to 3 carbon atoms, a being 2 or 3 and b being 1 or 2, in said filter the amount of said polyoxyalkylene compound being present in an amount between 2 and 10 parts for each part of said metal ion; and the amount of said metal ion being between about 0.2 and 4 mg, sufficient to remove at least a portion of any HCN produced upon combustion of said tobacco.

Claim 24

An improved filter tip cigarette according to claim 19 wherein said polyoxyalkylene compound has a molecular weight between about 300 and 1,000 and is a liquid at room temperature.

Claim 25

An improved filter tip cigarette according to claim 20 wherein said complex is formed from a water-soluble salt of a metal selected from the froup consisting of zinc, copper, nickel and iron (II) and an amine of the general formula NH.sub.2 --(R--NH).sub.x --H wherein R is a methylene or ethylene and x is an integer from 1 to 10, said complex being present in an amount between about 0.2 and 4 mgs of metal ion in said filter.

Claim 26

An improved filter tip cigarette according to claim 21 wherein said complex has an octahedral crystalographic structure.

Claim 27

An improved filter tip cigarette according to claim 21 wherein said complex is formed from the combination of a water-soluble zinc compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 28

An improved filter tip cigarette according to claim 21 wherein said complex is formed from the combination of a water-soluble copper compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetriamine and tetraethylenepentamine.

Claim 29

An improved filter tip cigarette according to claim 21 wherein said complex is formed from the combination of a water-soluble nickel compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 30

An improved filter tip cigarette according to claim 25 wherein said complex is formed from the combination of a water-soluble iron (II) compound and a polydentate amine selected from the group consisting of ethylenediamine, diethylenetriamine, triethylenetetramine and tetraethylenepentamine.

Claim 31

An improved tobacco smoke filter comprising a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II) with a polydentate amine of the general formula NH 2 --(R--NH) x --H where R is a methylene or ethylene and x is an integer from 1 to 10, said complex having a square planar crystallographic structure, and said complex being dispersed on a carrier therefor effective to provide an intimate exposure of said complex to a tobacco smoke stream containing HCN drawn through said filter, the amount of said complex being sufficient to remove selectively at least a portion of HCN from said tobacco smoke stream.

Claim 32

An improved tobacco smoke filter comprising a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II) with a polydentate amine of the general formula NH 2 --(R--NH) x --H where R is a methylene or ethylene and x is an integer from 1 to 10, said complex having a square planar crystallographic structure, and said complex being dispersed on a carrier therefor effective to provide an intimate exposure of said complex to a tobacco smoke stream containing HCN drawn through said filter, the amount of said complex being sufficient to remove selectively at least a portion of HCN from said tobacco smoke stream.

Claim 33

A tobacco smoke filter according to claim 27 wherein the metal is copper.

Claim 34

An improved filter tip cigarette according to claim 28 wherein the metal is copper.

Claim 35

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with the fibrous base material of a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II), and an amine of the general formula NH 2 --(R--NH) x --H wherein R is methylene or ethylene and x is an integer from 1 to 10, said complex having a square planar crystallographic structure, and said complex being present in an amount between about 1 and 8 mgs of metal ion in said filter effective to absorb selectively at least a portion of any HCN produced upon combustion of said shredded tobacco.

Claim 36

In a filter tip cigarette having in combination an elongated cylindrical plug of shredded tobacco joined at one end thereof with a filter element having a fibrous base material, the improvement comprising the combination with the fibrous base material of a complex formed by combining a water-soluble salt of a metal selected from the group consisting of zinc, copper, nickel and iron (II), and an amine of the general formula NH 2 --(R--NH) x --H wherein R is methylene or ethylene and x is an integer from 1 to 10, said complex having a square planar crystallographic structure, and said complex being present in an amount between about 1 and 8 mgs of metal ion in said filter effective to absorb selectively at least a portion of any HCN produced upon combustion of said shredded tobacco.