FLEXIBLE POLYPROPYLENE RESIN COMPOSITIONS, FILMS OR SHEETS MADE THEREFROM, AND SURFACE-PROTECTIVE FILMS OR SHEETS MADE THEREFROM

摘要

(1) Provided is a flexible polypropylene resin composition comprising 100 parts by weight of a flexible polypropylene resin having (a) a peak melting temperature of 150 DEG C or above as measured through differential scanning calorimetry and (b) a tensile modulus of elasticity of from 200 to 700 MPa, and from 0.05 to 5 parts by weight of a hindered amine light stabilizer. The flexible polypropylene resin preferably comprises (A) from 20 to 100 % by weight of a propylene homopolymer having (c) a pentad fraction, rrrr/(1-mmmm) x 100, as measured through isotopic carbon nuclear magnetic resonance spectrometry (<13>C-NMR) of from 20 to 60 %, and (d) a melting enthalpy as measured through differential scanning calorimetry of from 10 to 100 J/g, and/or a propylene copolymer containing at most 4 % by weight of other olefin units and having the physical data of (c) and (d), and (B) from 0 to 80 % by weight of a propylene copolymer containing from 10 to 80 % by weight of non-propylene olefin units. (2) The flexible polypropylene resin composition (1) may contain from 0.05 to 5 parts by weight, relative to 100 parts by weight of the flexible polypropylene resin, of a benzotriazole ultraviolet absorbent. (3) Also provided is a film or sheet of the resin composition of (1) or (2). The resin composition is molded into moldings, especially films or sheets. An adhesive layer, an ink layer and/or a substrate film or sheet may be formed on the films or sheets of the composition to produce surface-protective films or sheets having good weather resistance.