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Cyclodextrin Polymers for Use with Cellulose and Other Polysaccharides

IP.com Disclosure Number: IPCOM000126499D
Publication Date: 2005-Jul-21
Document File: 25 page(s) / 93K

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Peggy Ward: AUTHOR [+3]

Abstract

Polymeric cyclodextrins offer several potential advantages over monomeric cyclodextrins in a variety of applications, particularly those involving fibrous webs. The higher molecular weight of the polymeric cyclodextrins, for example, can contribute to improved performance. Applications of polymeric cyclodextrins can include articles such as bath and facial tissue, paper towels and personal care articles. Uses for products containing both complexed and uncomplexed polymeric cyclodextrins are discussed. Derivatized polymeric cyclodextrins and fibers containing polymeric cyclodextrins can be prepared by utilizing various known processes.

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CYCLODEXTRIN POLYMERS FOR USE WITH CELLULOSE AND OTHER POLYSACCHARIDES

Abstract

     Polymeric cyclodextrins offer several potential advantages over monomeric cyclodextrins in a variety of applications, particularly those involving fibrous webs. The higher molecular weight of the polymeric cyclodextrins, for example, can contribute to improved performance. Applications of polymeric cyclodextrins can include articles such as bath and facial tissue, paper towels and personal care articles. Uses for products containing both complexed and uncomplexed polymeric cyclodextrins are discussed. Derivatized polymeric cyclodextrins and fibers containing polymeric cyclodextrins can be prepared by utilizing various known processes.

Background

     Cyclodextrins are cyclic carbohydrates that contain a ring of monosaccharide units. The specific coupling and conformation of the monosaccharide units often give the cyclodextrins a rigid, conical molecular structure with a hollow interior of a specific volume. This structure offers a toroidal geometry with a hydrophilic exterior and a hydrophobic interior. Several cyclodextrins and methods for making them exist. A common method is production of cyclodextrins enzymatically from starch.

     The term "cyclodextrin" as used within the context of this article includes all monomeric cyclodextrin compounds. Monomeric cyclodextrin compounds are actually polymeric species containing from six to twelve glucose units, such as α-, β-, and γ-cyclodextrins. Alpha-, β-, and γ-cyclodextrins differ from one another by the number of glucose units in their structure. Alpha-cyclodextrins have 6 glucose units arranged in a donut-shaped ring, β-cyclodextrins have 7 glucose units arranged in a donut-shaped ring, and γ-cyclodextrins have 8 glucose units arranged in a donut-shaped ring.

     Various derivatives of the monomeric cyclodextrins are also known. Examples of cyclodextrin derivatives include methyl-β-cyclodextrin, hydroxyethyl-β-cyclodextrin, and hydroxypropyl-β-cyclodextrin of different degrees of substitution. Some cyclodextrin derivatives are disclosed in the following U.S. Patent Nos.: 3,426,011, 3,453,257,

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3,453,258, 3,453,259, 3,453,260, 3,553,191, and 3,565,887 all to Parmerter et al.; 3,459,731 to Gramera et al.; 4,535,152 to Szejtii et al.; 4,616,008 to Hirai et al.; 4,638,058 to Brandt et al.; 4,746,734 to Tsuchiyama et al.; and 4,678,598 to Ogino et al. The "cyclodextrins" reference in the document includes mixtures that incorporate different types of cyclodextrins, derivatives of different types of cyclodextrins, different types of derivatives of one or more type of cyclodextrins.

     The unique shape and physical-chemical properties of cyclodextrins enable cyclodextrin molecules to form complexes with organic molecules or parts of organic molecules. Many hydrophobic molecules or groups will form complexes with the interior of a cyclodextrin despite the hydrophilic exterior of the molecule. Such comp...