Poly(acrylic acid)-based superabsorbent polymer (SAP) in a feed stream is converted with UV irradiation into poly(acrylic acid) (PAA) in a flow system. The UV total energy used to convert SAP into PAA is less than about 50 MJ/kg SAP.

A biodegradable polyester and use thereof includes components: A) acid components containing following repeating units: 40 to 48 mol % of terephthalic acid A1; 38.5 to 50 mol % of sebacic acid A2; and 2 to 20 mol % of an aliphatic dibasic acid A3 with a carbon chain length of 6 or less; B) butanediol. In the case of low content of the terephthalic acid unit, by introducing the aliphatic dibasic acid unit with the carbon chain length of 6 or less, mechanical properties of the material can be significantly improved, and the mechanical property retention is better especially when stored in a humid environment.

Generally spherical resin particles formed of a thermoplastic resin, having a sphericity of 0.90 to 1.00, a light scattering index of 0.5 to 1.0 and a linseed oil absorption of 30 to 150 mL/100 g.

Disclosed a preparation method of a green, biodegradable, and multifunctional collagen-based nanocomposite film, and overcomes the problems of difficult biodegradation, poor barrier property, and single function of food packaging materials in the existing technologies. The present invention includes the following steps: adding silicate nanosheet into deionized water for ultrasonic dispersion; then adding polyphenolic acid into the mixture, wherein a mass ratio of the polyphenolic acid to the silicate nanosheet is 1:(0.2˜1); and adjusting the pH value to 3.0˜4.0 to obtain a solution A; adding collagen with a concentration of 5 g/L into an acetic acid solution, and fully dissolving the collagen to obtain a solution B; isovolumetrically mixing the solution A with the solution B, stirring at room temperature, and adjusting the pH value to 4.5˜5.5 to obtain a casting solution; and pouring the casting solution into a polytetrafluoroethylene mold, and naturally drying to obtain a nanocomposite film.

This cellulose composition contains: (A) a water-soluble cellulose ether, (B) water-insoluble cellulose particles and (C) water. The cellulose composition serves as a novel biomass material which uses biodegradable cellulose that places little burden on the environment, and exhibits excellent shape retention properties.

Multilayer thin film devices that include a bioactive agent for elution to the surrounding tissue upon administration to a subject are provided. The multilayer thin film devices are useful as medical devices, such as ocular devices. Also provided are methods and kits for localized delivery of a bioactive agent to a tissue of a subject, and methods of preparing the subject devices. The multilayer thin film medical device includes a first layer, a bioactive agent and a second layer. The first and the second layers may be porous or non-porous. The devices have a furled structure, suitable for administration to a subject.

Hydrogels that degrade under appropriate conditions of pH and temperature by virtue of crosslinking compounds that cleave through an elimination reaction are described. The hydrogels may be used for delivery of various agents, such as pharmaceuticals.

Provided is a dental dual-structured membrane. The dental dual-structured membrane according to an embodiment of the present inventive concept includes a shielding portion for shielding a bone grafting material and an alveolar bone from the outside to prevent infiltration of other tissue cells, and an insertion and fixing portion connected to the shielding portion and inserted between a gum and the alveolar bone to fix the shielding portion, in which the insertion and fixing portion has a higher tensile strength than the shielding portion.

Packaging material for food products with antimicrobial and antifungal properties including: a) a core layer of polymeric material including at least one active substance having antimicrobial and/or antifungal activity dispersed in the polymer matrix, b) a coating applied to a side of the core layer obtained from a lacquer or a polymeric paint including nano-fillers of a phyllosilicate or hydrotalcite, c) a coating for the release of an active antimicrobial or antifungal agent comprising encapsulated ethanol and a polymeric component selected from chitosan grafted with polyethylene glycol or cyclodextrin, a mixture of chitosan and polyethylene glycol and a polymer or mixture of polymers for printable paint applied to other side of the base layer; optionally the material further comprises: d) a coating with oxygen scavenger activity applied to the coating layer c) and/or a further coating e) including active substances of type b).

The porous-cellulose particles according to the present invention are constituted by gathered crystalline celluloses having a type I crystal form including a glucose molecule as a constitutional unit. That is, porous-cellulose particles having high sphericity have been achieved from a natural raw material. The porous-cellulose particles have an average particle diameter of 0.5 to less than 50 μm, a specific surface area of 50 to 1000 m.sup.2/g, and a sphericity of 0.85 or more. Cosmetic products containing such porous-cellulose particles have excellent texture properties.