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Combination of substituted cyclodextrin compound and activated carbon

a technology of activated carbon and cyclodextrin, which is applied in the field of compounding, can solve the problems of unsatisfactory small molecule vocs and the inability to reach the final equilibrium much longer, and achieve the effects of preventing absorption, preventing diffusion, and generating

Inactive Publication Date: 2012-03-22
CELLRESIN TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

"The patent describes a new additive composition for blending with polymers that can prevent the absorption and formation of harmful substances. The additive consists of cyclodextrin and activated carbon particles. The activated carbon particles enhance the scavenging properties of the cyclodextrin by acting as a barrier layer to prevent the diffusion of organic small molecules. The additive can be blended with polymers in a ratio of about 1 part activated carbon to 10 parts cyclodextrin. The inclusion of the additive in polymers can improve their scavenging properties and prevent the formation of yellow color. The inclusion of the additive is facilitated by the strong interaction between the apolar CD cavity and polar water, which allows the formation of a complex. The additive can be used in various polymer matrices and does not significantly affect the physical properties of the polymer."

Problems solved by technology

Finally, the additive can scavenge the byproducts of thermal processing, where degradation of materials can result in undesirable small molecule VOCs.
Organic acids are a common impurity in many industrial grade resins, which previously presented a problem when the scavenging properties of cyclodextrin were desirably introduced into a thermoplastic article.
While this initial equilibrium to form the complex is very rapid (often within minutes), the final equilibrium can take much longer to reach.

Method used

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  • Combination of substituted cyclodextrin compound and activated carbon
  • Combination of substituted cyclodextrin compound and activated carbon
  • Combination of substituted cyclodextrin compound and activated carbon

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0139]A 35 wt.-% methyl beta cyclodextrin (degree of substitution 1.0, manufactured by Wacker-Chemie of Adrian, Mich.) solution was prepared in deionized water. Prior to preparing the solution, 0.10 wt % of coconut charcoal previously ground in a mortar and pestle was blended into the dry cyclodextrin (16 hours@100° C.). The 35 wt % methyl beta cyclodextrin solution containing activated carbon was centrifuged at 750 rpm for 30 minutes. An upper aliquot of the centrifuged solution was added to a glass slide and then covered with a slip slide. Gray scale (8 bit) digital images were then taken of the solution using a transmitted light microscope (Olympus BH2, available from Olympus America Inc. of Melville, N.Y.) with a 40× objective equipped with a 4 megapixel eyepiece camera. Six pictures were taken of the sample. A reference photograph was taken of a stage micrometer for dimensional calibration. The images were analyzed by Optimas image analysis software (available from the X Compan...

example 2

[0141]Emery 3004 synthetic hydrocarbon oil manufactured by Cognis Corporation, Cincinnati, Ohio was infused with 0.20 wt % of coconut charcoal previously ground in a mortar and pestle. The oil with activated carbon dispersion was centrifuged at 750 rpm for 30 minutes. An upper aliquot of the centrifuged oil was added to a glass slide and then covered with a slip slide. Gray scale (8 bit) digital images were then taken of the oil using an Olympus BH2 transmitted light microscope equipped with a 40× objective and a 4 mega-pixel eyepiece camera. Two pictures were taken of the sample. A reference photograph was taken of a stage micrometer for dimensional calibration. The images were analyzed by Optimas image analysis software: a variable threshold was used, a binary fill operation was performed, and the data from each image was extracted. The information extracted was the area equivalent diameter (AED). The results were obtained by analyzing the data using the statistical package R.

[014...

example 3

[0143]Dried β-cyclodextrin was analyzed for thermal stability based upon the potential of generating volatile thermal decomposition products produced from impurities including acetic acid, formic acid, furfurals, linear starches and sugars, dehydrated linear starches, levoglucosan, levoglucosenone and proteins. This method mimics the processing of reactive extrusion where β-cyclodextrin is grafted onto maleic anhydride functionalized polyolefins, and any subsequent conversion of the material to form an article. β-Cyclodextrin (manufactured by Wacker-Chemie of Adrian, Mich.) was prepared by dry blending 0.01, 0.10 and 1.0 wt % of coconut charcoal previously ground in a mortar with dry cyclodextrin (16 hours@100° C.). β-cyclodextrin, 0.5 grams was added to a 40 mL headspace vial (available from IChem® Corp. of) with a Teflon-faced septa screw cap. The vial with screw cap removed was heated in an oven to 290° C. for exactly 2 minutes. The vial was removed from the oven and allowed to c...

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Abstract

The invention is a composition that can prevent formation in, or scavenge undesirable organic materials from, a polymer matrix. The composition contains cyclodextrin and particles of activated carbon. The composition can scavenge thermal decomposition products that can be produced during melt processing of a polymer, contaminants inherent in a polymer, or other types of impurities from a polymer matrix that otherwise may elute into the air, a water supply, or an ingestible material such as a food, a drug, or a beverage. Other aspects of the invention are blends of the composition with polymeric materials, methods of making blends, articles containing the composition, and methods of making articles containing the composition.

Description

CROSS REFERENCE TO RELATED APPLICATIONS [0001]This application is a divisional application of U.S. patent application Ser. No. 12 / 033,649, filed Feb. 19, 2008, which claims priority from provisional application Ser. No. 60 / 890,707, filed Feb. 20, 2007, and which is incorporated herein by reference.FIELD OF THE INVENTION [0002]The invention relates to a composition that can prevent formation of or scavenge undesirable organics from contact with a polymer matrix. The invention relates to scavenging thermal decomposition products produced during melt processing from contaminants inherent in the composition and impurities from a polymer matrix that otherwise may elute into the air, a water supply, or an ingestible material such as a food, a drug, or a beverage. The invention is drawn to compositions for preventing the release of or scavenging volatile organic components; blends of polymers with the compositions of the invention; and articles made from the polymers having the composition...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08L5/16B29C47/00B29B9/00B05D7/02B05D3/00B29C48/00B29C48/10
CPCB29B9/06B29B9/12C08L87/00C08L67/02C08L67/00C08L23/02C08L5/16C08K3/04C08J2467/00C08J2405/16C08J3/226B29C47/00B29C47/0026C08B37/0012C08L2666/02C08L2666/18C08L2666/26B29C48/10B29C48/00C08J3/22C08J5/00C07B63/04C09K15/00B29K2067/003C08J2367/02
Inventor WOOD, WILLARD E.
Owner CELLRESIN TECH
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