Edible Functional Coatings And Hybrid Polymer-Based Coatings For Pharmacy And Food

Abstract

A composition contains silicic acid polycondensate modified with organic groups, as a coating for medicines and foodstuffs or as a component in such a coating. The organic groups are partially or wholly biodegradeable. A method for producing a product coated with the composition and a coated product are further described.

1 - 19 . (canceled) 
     
     
         20 . A coating composition for a drug or food substrate, the coating composition comprising silicic acid polycondensate modified with organic groups. 
     
     
         21 . The coating composition according to  claim 20 , wherein the organic groups are derivatives of at least type of natural or synthetic organic polymer. 
     
     
         22 . The coating composition according to  claim 20 , wherein the organic groups are partially or exclusively biodegradable groups. 
     
     
         23 . The coating composition according to  claim 20 , wherein the organic groups present are at least partially incorporated into the silicic acid polycondensate via Si—C bonds. 
     
     
         24 . The coating composition according to  claim 20 , wherein the coating composition is water-soluble or water-insoluble. 
     
     
         25 . The coating composition according to  claim 20 , wherein the coating composition is enteric. 
     
     
         26 . The coating composition according to  claim 20 , wherein the silicic acid polycondensate furthermore has organic groups incorporated into the silicic acid polycondensate via Si—C bonds, wherein the organic groups are thermally or photochemically organically polymerizable. 
     
     
         27 . The coating composition according to  claim 26 , wherein the thermally or photochemically organically polymerizable organic groups are epoxy groups. 
     
     
         28 . The coating composition according to  claim 20 , wherein at least a portion of the organic groups have a hydrocarbon chain of from 2 to 8 carbon atoms, located between two groups each selected from the group consisting of ether, ester, amide, and urethane groups. 
     
     
         29 . The coating composition according to  claim 20 , wherein at least a portion of the organic groups have at least two hydrocarbon chains having 2 to 8 carbon atoms which are branched-chain to one another. 
     
     
         30 . The coating composition according to  claim 20 , further comprising at least a portion of inorganic biodegradable groups having a component [O—(CH 2 ) m —C(O)—O] n , where m is an integer between 2 and 8, n is 0, 1, 2, or 3 or greater than 3, and, if said component is present in an organic biodegradable group, may have different values, with a proviso that n in only one or in at least one component is 1 or greater than 1. 
     
     
         31 . The coating composition according to  claim 20 , wherein the organic groups are selected from the group consisting of polycaprolactone triol, chitosan, cellulose, cellulose derivatives, and cellulose building blocks. 
     
     
         32 . The coating composition according to  claim 20 , further comprising at least one filler which is pharmaceutically acceptable. 
     
     
         33 . A method for preparation of a coated product selected from the group consisting of coated medicines and coated foods, which comprises the steps of: applying a coating composition, which contains an organo-modified silicic acid polycondensate, to a drug or food substrate; and (ii) drying and/or curing the coating composition. 
     
     
         34 . The method according to  claim 33 , which comprises prior to the step or after the step an additional step in which the drug or food substrate is at least partially coated with a metal oxide layer. 
     
     
         35 . The method according to  claim 33 , wherein the coating composition contains silicic acid polycondensate modified with organic groups. 
     
     
         36 . The method according to  claim 33 , wherein the coating composition is present in a diluent and/or solvent. 
     
     
         37 . A coated product produced according to  claim 33 . 
     
     
         38 . A coated product comprising: a drug or food substrate; and a coating composition applied to the substrate, wherein the coating composition contains silicic acid polycondensate modified with organic groups. 
     
     
         39 . The coated product according to  claim 38 , wherein said organic groups are partially or exclusively biodegradable. 
     
     
         40 . The coated product according to  claim 38 , wherein the substrate is partially or completely coated with the coating composition.