ULTRA-HIGH IMPACT RESISTANT FILM AND PREPARATION THEREOF

• Main Authors: NAMIKAWA KIYOSHI, FUJII TAKESHI, HOSODA SATORU
• Format: Patent
• Language: English
• Published: 04.08.1984
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; MAKING GRANULES OR PREFORMS; 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; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PURPOSE:To obtain the titled film having a specific physical property values, restricted orientation and good tear strength balance by preparing film from copolymer of ethylene and alpha-olefin. CONSTITUTION:This is ultra-high impact resistant film obtained from copolymer both of ethylene (density 0.895-0.935g/m , melt index 0.5g/10min max.) and alpha- olefin of C3-18 and has orientation function fbeta -0.1 min., orientation function fepsilon 0.1 max. and thickness 30mum max. Said film is prepared in air cooling 2 by constricting a cylindrical melting body extruded from a die 1 to the diameter smaller than the diameter of the die along a conical inner mandrel 4 arranged concentrically to the die, then, expanding it to the blow-up ratio 3 min. to form a bubble and making the height of the fixed portion 3 from the outlet of the die 5 times min. as large as the diameter of the die.