VINYLIDENE CHLORIDE COPOLYMER RESIN FILM HAVING LOW OXYGEN PERMEABILITY

• Main Authors: MASASHI MORII, KAZUO UEDA, MINORU YOSHIDA
• Format: Patent
• Language: English
• Published: 01.08.1974
• Subjects: AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; GENERAL PROCESSES OF COMPOUNDING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MAKING GRANULES OR PREFORMS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PREPARATION OR PRETREATMENT OF THE MATERIAL TO BESHAPED; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIALCONTAINING PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

Tubular packaging film esp. for foods with a low-oxygen permeability and a low softening point consists of two layers of vinylidene chloride copolymers, the first having an oxygen permeability at 30 degrees C of less than 3.0 x 10-12 cc.cm/cm2 sec. cm Hg. and the second having a softening temp. below 20 degrees C the first layer forming the inner layer in contact the packaged material. Both surfaces of the first layer are covered with the second layer. The first and second layers has a thickness of 3-70 mu. The outer second layer has a thickness of 20-70 mu. The copolymer contians 65-95 wt.% vinylidene chloride and 35-5 wt.% chloride. Protects packaged foods against oxygen and remains flexible at low temps. e.g. below 5 degrees C.