NANOCOMPOSITE POLYMERIC COMPOSITION WITH BARRIER PROPERTIES AND PROCESS FOR OBTAINING THE SAME

• Main Authors: IOVU HORIA, CONSTANTIN VIRGIL, EVI LUCREŢIA, DIMONIE OLGA DOINA, SPOITU CONSTANTIN, IONESCU MARIA
• Format: Patent
• Language: English; Romanian
• Published: 30.03.2010
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS,e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES,DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; CONVEYING; HANDLING THIN OR FILAMENTARY MATERIAL; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PACKAGES; PACKAGING ELEMENTS; PACKING; PERFORMING OPERATIONS; STORING; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING

The invention relates to a polymeric composite used for making food packing and to a process for obtaining the same. According to the invention, the composite is a mixture consisting of 81...95.5 parts of ethylene-vinyl acetate copolymer, 2...10 parts of functionalized layered silicate, 2...8 parts of compatibility agent and 0.5...3 parts of stabilizer, the parts being expressed by weight. According to the invention, the process consists of a first stage of drying the ethylene-vinyl acetate copolymer and the layered silicate, a second stage of extrusion at the temperature of 110...130°C of a concentrate consisting of an ethylene-vinyl acetate copolymer, silicate and stabilizer, followed by a third stage of extrusion of a mixture consisting of the concentrate, rendered compatible, resulting in the previous stage and the ethylene-vinyl acetate copolymer and, finally, in a fourth stage, the granules thus obtained are processed to obtain the packing for food products. Invenţia se referă la un compozit polimeric, utilizat pentru fabricarea unor ambalaje alimentare, şi la un procedeu pentru obţinerea acestuia. Compozitul conform invenţiei este un amestec constituit din 81...95,5 părţi copolimer etilenă-acetat de vinil, 2...10 părţi silicat stratificat funcţionalizat, 2...8 părţi agent de compatibilizare şi 0,5...3 părţi stabilizator, părţile fiind exprimate în greutate. Procedeul conform invenţiei constă dintr-o primă fază de uscare a copolimerului etilenă-acetat de vinil şi a silicatului stratificat, o a doua fază de extrudare, la temperatura de 110...130°C, a unui concentrat format din copolimer etilenă-acetat de vinil, silicat şi stabilizator, urmată de o a treia fază de extrudare a unui amestec format din concentratul rezultat la etapa anterioară, compatibilizat, şi copolimer etilenă-acetat de vinil, şi, în final, într-o a patra fază se prelucrează granulele astfel obţinute în ambalaje pentru produse alimentare.