LAMINATE

• Main Authors: FUJIMURA KAZUMASA, TAKAYAMA MASATO
• Format: Patent
• Language: English
• Published: 13.12.2012
• Subjects: LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a polypropylene laminate having superior transparency and moisture barrier properties though it is flexible.SOLUTION: The laminate has at least a three layered structure. The laminate uses a propylene-ethylene block copolymer (A) that satisfies the followings (A-i) and (A-ii) for both surface layers, and uses the composition of a polypropylene component (B) 40-95 wt.% and an alicyclic hydrocarbon resin component (C) 60-5 wt.% that satisfies the following (C-i) for an intermediate layer. (A-i) The propylene-ethylene block copolymer is obtained by using the metallocene catalyst and sequentially polymerizing 30-95 wt.% of the propylene ethylene random copolymer component (A1) with the ethylene content 0.3-7 wt.% in a first process, and 70-5 wt.% of the propylene ethylene random copolymer component (A2) that has 3-20 wt.% more than component (A1) in a second process. (A-ii) Melt flow rate (MFR:2.16 kg, 230°C) is in the range of 0.1-30 g/10 minute. (C-i) The softening point temperature is ≥110°C and ≤160°C.