Tobacco smoke filter material and process for the preparation thereof

Inactive Publication Date: 2008-06-12
EASTMAN CHEM CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0012]We have found that gaseous aldehydes such as formaldehyde, acetaldehyde and acrolein may be removed selectively from tobacco smoke by contacting tobacco smoke containing one or more aldehydes with a fibrous filter element comprising fibers of a polymeric material wherein the polymeric material contains covalently bonded acetoacetyl residues. Thus, one embodiment of the present invention is a fibrous filter element comprising fibers of a polymeric material wherein the polymeric material contains covalently bonded acetoacetyl residues. A second embodiment is a method of removing a gaseous aldehyde from tobacco smoke by contacting tobacco smoke

Problems solved by technology

Active materials such as activated carbon, silica gel, alumina, and zeolites commonly used for the removal of gaseous contaminates are not particularly suitable for this purpose.
Moreover, the adsorption by these porous materials is not considered effective since the molecules are only physically bound to the surface and not chemically reacted.
These chemicals can only be used to treat fibers having high chemical resistances such as activated carbon fibers.
Further, fibers thus treated are potentially hazardous to handle.
The application of this technology is limited to the solid forms as stated.
This technology has a deficiency in that the reactive component, i.e., an amine, may be consumed by carbon dioxide present in air.
; however, it does not disclose aldehydes removal.
The patent, however, does not disclose or characterize the product composition after the treatment with diketene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of Acetoacetate-Functional Cellulose Acetate Tow

[0023]A sample of cellulose acetate filter tow (25.2 g) was added to a 1 L, round-bottom flask equipped with a thermowell, a rod shaped magnetic stirring bar under argon, a vigereux column, and a distillation take off head. The cellulose acetate of the filter tow has an acetyl degree of substitution (DS) of 2.45 providing an expected free hydroxyl content of 52 millimoles (mmol). The filter tow consisted of cellulose acetate filaments having a denier per filament of 2.7 and a total denier of 35,000. To the flask was charged toluene (502.7 g) and the mixture was heated to reflux (pot temperature=109° C.) and maintained at reflux for 30 minutes. The resulting distillate (8 g) was removed until it was no longer cloudy; the distillate was found to contain about 1 ml of water. Over a 30 to 60 minute period the mixture was permitted to cool to 60° C. using a heating mantel as an insulator. 4-(Dimethylamino)pyridine (DMAP; 0.47 g)...

example 2

Preparation of Acetoacetate-Functional Cellulose Acetate Tow

[0026]In this example a large excess of diketene was used to obtain a higher degree of acetoacetate substitution. The cellulose acetate of the filter tow utilized has an acetyl DS of 2.45 providing an expected free hydroxyl content of 53 mmol. Cellulose acetate filter tow (25.77 g) was added to a 1 L, round-bottom flask equipped with a thermowell, a glass mechanical stirrer under argon, a vigereux column, and a distillation take off head. The filter tow consisted of cellulose acetate filaments having a denier per filament of 2.7 and a total denier of 35,000. To the flask was charged toluene (503.00 g) and the mixture was heated to reflux (pot temperature=109° C.) and maintained at reflux for 30 minutes. The resulting distillate (5 g) was removed until it was no longer cloudy; the distillate was found to contain about 1 ml of water. Over a 30 to 60 minute period the mixture was permitted to cool to 60° C. using a heating man...

example 3

Preparation of Acetoacetate-Functional Cellulose Acetate Filter Rod

[0028]This example illustrates the reaction of gaseous diketene with cellulose acetate in the form of a filter rod 12.5 cm in length having an outside diameter of 8 mm). The filter rod (approximately 0.8 g weight) is produced from cellulose acetate filter tow and paper wrap wherein the cellulose acetate of the filter tow utilized has an acetyl DS of 2.45 providing an expected free hydroxyl content of 1.7 mmol. The filter tow consisted of cellulose acetate filaments having a denier per filament of 2.7 and a total denier of 35,000. The filter rod was inserted tightly into a glass tube equipped with vacuum tubing and vacuum meters on both ends. To one end was attached a vacuum pump with trap filled with dry ice. To the other end was attached a 15-mL round-bottom vacuum flask charged with diketene (5.0 g). The pump then was turned on to yield a vacuum of about 3 mm-Hg on the pump side and 8 mm-Hg on the flask side. This ...

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Abstract

Disclosed are materials and compositions effective for the selective removal of gaseous aldehydes from tobacco smoke. The materials and compositions comprise tobacco smoke filters comprising a fibrous material or fibers of a polymeric material containing covalently-bonded acetoacetoxy residues. The fibrous material or fibers are capable of reacting with and removing aldehydes present in tobacco smoke. Also disclosed are processes for the preparation of fibrous materials and fibers of a polymeric material containing covalently-bonded acetoacetoxy residues and methods for the removal of a gaseous aldehyde from tobacco smoke by contacting tobacco smoke with the aforesaid fibrous materials or fibers containing covalently-bonded acetoacetoxy residues.

Description

FIELD OF THE INVENTION[0001]This invention relates to materials and compositions which are effective for the selective removal of gaseous aldehydes from tobacco smoke. More specifically, this invention pertains to a tobacco smoke filter comprising a fibrous material or fibers of a polymeric material containing covalently-bonded acetoacetoxy residues. The fibrous material or fibers are capable of reacting with and removing aldehydes present in tobacco smoke. This invention also pertains to the preparation of fibrous materials and fibers of a polymeric material containing covalently-bonded acetoacetoxy residues. This invention further relates to a method for the removal of a gaseous aldehyde from tobacco smoke by contacting tobacco smoke with the aforesaid fibrous materials or fibers containing covalently-bonded acetoacetoxy residues.BACKGROUND OF THE INVENTION[0002]Tobacco smoke resulting from tobacco combustion contains numerous gaseous molecules and particulates. These gaseous mole...

Claims

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Application Information

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IPC IPC(8): A24D1/04A24D3/06A24D3/02
CPCA24D3/08B01J20/26A24D3/14A24D3/10
InventorGERMROTH, TED CALVINWILSON, STEVEN ANTHONYKUO, THAUMINGHUBBS, JOHN CLARK
OwnerEASTMAN CHEM CO