Combination of substituted cyclodextrin compound and activated carbon
AssigneeCellresin Technololgies, L.L.C.
InventorWillard E. Wood
Life of this patent
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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.
Claims50
A masterbatch composition comprising:
- (a) a thermoplastic polymer;
- (b) a substituted cyclodextrin compound in an amount corresponding to about 100 to 150,000 parts by weight of substituted cyclodextrin per each one million parts of the composition;
- and
- (c) carbon particles comprising activated carbon in an amount corresponding to about 0.005 to 5,000 parts by weight of carbon particles per each one million parts of the composition,
- wherein the substituted cyclodextrin has a degree of substitution of about 0.3 to 2.5 and is substantially free of any compound in the central pore of the cyclodextrin ring.
A method of making a masterbatch composition, the method comprising contacting a molten thermoplastic polymer with an additive mixture, said additive mixture comprising:
- (a) a substituted cyclodextrin compound in an amount corresponding to about 100 parts by weight to 150,000 parts by weight of cyclodextrin groups per each one million parts of masterbatch composition, and
- (b) carbon particles comprising an activated carbon present in an amount corresponding to about 0.005 parts by weight to 5000 parts by weight per each one million parts of the masterbatch composition,
- wherein the substituted cyclodextrin has a degree of substitution of about 0.3 to 2.5 and is substantially free of any compound in the central pore of the cyclodextrin ring.
A method of making a coated pellet or chip comprising contacting an additive composition with the surface of a thermoplastic pellet or chip, said additive composition comprising:
- (a) a substituted cyclodextrin compound, and
- (b) an effective amount of carbon particles comprising activated carbon,
- wherein the substituted cyclodextrin has a degree of substitution of about 0.3 to 2.5 and is substantially free of a compound in the central pore of the cyclodextrin ring.
A thermoplastic polymeric article comprising:
- (a) a thermoplastic polymer;
- (b) a substituted cyclodextrin compound in an amount corresponding to about 10 parts by weight to 50,000 parts by weight of cyclodextrin groups per each one million parts by weight of the article;
- and
- (c) an effective amount of carbon particles comprising activated carbon,
- wherein the substituted cyclodextrin has a degree of substitution of about 0.3 to 2.5 and is substantially free of any compound in the central pore of the cyclodextrin ring.
A method of making a thermoplastic article comprising the steps of:
- (a) contacting a treated thermoplastic chip or pellet with an untreated thermoplastic chip or pellet, the treated thermoplastic chip or pellet comprising
- (i) a substituted cyclodextrin in an amount of about 100 parts by weight to 150,000 parts by weight of per each one million parts of the treated chip, and
- (ii) a carbon particle comprising an activated carbon in an amount of 0.005 to 5000 parts by weight per one million parts of the treated chip;
- and
- (b) forming the article,
- wherein the substituted cyclodextrin has a degree of substitution of about 0.3 to 2.5 and is substantially free of any compound in the central pore of the cyclodextrin ring.
Dependencies are inferred from the claim text.