Use of polyester resins for the production of articles having good properties asbarriers to water vapour

• Main Authors: MARCO FOA, GIOVANNI FLORIDI, TIZIANA MILIZIA, CATIA BASTIOLI, FERNANDA FARACHI, GIANDOMENICO CELLA
• Format: Patent
• Language: English
• Published: 21.03.2000
• Edition: 7
• Subjects: ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; BANDAGES, DRESSINGS OR ABSORBENT PADS; BRAIDING; 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; COTTON-WOOL; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS,NON-WOVEN FABRICS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; GENERAL PROCESSES OF COMPOUNDING; HANDLING THIN OR FILAMENTARY MATERIAL; HUMAN NECESSITIES; HYGIENE; IMPREGNATING OR COATING OF PAPER; KNITTING; LACE-MAKING; MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS; MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARYMATERIAL; MEDICAL OR VETERINARY SCIENCE; METALLURGY; NON-WOVEN FABRICS; ORGANIC MACROMOLECULAR COMPOUNDS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PACKAGES; PACKAGING ELEMENTS; PACKING; PAPER NOT OTHERWISE PROVIDED FOR; PAPER-MAKING; PERFORMING OPERATIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; PRODUCTION OF CELLULOSE; PROSTHESES; PULP COMPOSITIONS; STORING; TEXTILES; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; TREATMENT OR PROTECTION OF EYES OR EARS; TRIMMINGS; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; WADDING; WORKING-UP

Polyester resins formed by recurring units X=[O-(CH2)n-OCO-(CH2)m-CO] and/or Y=[O-(CH2)k-CO], where the half-sum of n+m is equal to or greater than 6 and k is a number equal to or greater than 6, or by copolymers comprising units and/or sequences having the formula xi[O-(CH2)ni-OCO-(CH2)mi-CO]; yj[O-(CH2)kj-CO] where: i,j=1-5; ni=2-22; mi=0-20; kj=1=21; (Formula (1)) and xi and yj vary between 0 and 1 and are molar fractions of the various units such that (Formula (2)), are used for the preparation of products in which a permeability to water vapour of less than 350 gx30 mum/m per day, measured at 38° C. and 90% RH and good biodegradability are required.