Wrap film
First Claim
1. A wrap film comprising a thermoplastic resin composition and having an elongation at break in the longitudinal direction of less than 100% and a strength at 5% elongation in the longitudinal direction of 150 cN/10 mm or less.
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Accused Products
Abstract
A wrap film comprising a thermoplastic resin composition and having a longitudinal direction elongation at break of less than 100% and a longitudinal direction strength at 5% elongation of 150 cN/10 mm or less is disclosed. The thermoplastic resin composition comprises a polypropylene resin and at least one resin having a flexural modulus of 100 MPa or less selected from an ethylene-propylene rubber and an ethylene-α-olefin copolymer having 4 or more carbon atoms in the α-olefin unit.
14 Citations
30 Claims
- 1. A wrap film comprising a thermoplastic resin composition and having an elongation at break in the longitudinal direction of less than 100% and a strength at 5% elongation in the longitudinal direction of 150 cN/10 mm or less.
- 11. A wrap film which is a stretched film of a polypropylene resin composition comprising (A) a polypropylene resin, (B) a tackifier comprising a hydrocarbon having a number average molecular weight of 300 to 3000, (C) a nonionic surface active agent having an HLB value of 3.5 to 8, and (D) a nonionic surface active agent or fat and oil having a smaller HLB value than component (C).
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17. A biaxially stretched polypropylene multilayer film obtained by simultaneous biaxial stretching of a sheet having at least layer A, layer B and layer C in this order, wherein
said layer A is made of a resin composition comprising a polypropylene resin and 1 to 15 parts by weight of at least one of polybutene and polyisobutylene per 100 parts by weight of the polypropylene resin, said layer B is made of a resin composition comprising a polypropylene resin and 1 to 20 parts by weight of at least one of polybutene and polyisobutylene per 100 parts by weight of the polypropylene resin, said layer C is made of a resin composition comprising a polypropylene resin and 1 to 15 parts by weight of polybutene per 100 parts by weight of the polypropylene resin, said polypropylene resins used in said layers A, B and C independently have a melt flow rate of 0.5 to 15 g/10 min at 230° - C.,
the DSC peak melting temperature of said resin composition of said layer B exceeds those of said resin compositions of said layers A and C, and the stretch ratios of said sheet in the machine direction and the transverse direction independently range from 3 to 7.
- C.,
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27. A biaxially stretched polyolefin multilayer film f or wrapping which is obtained by simultaneous biaxial stretching of a sheet having at least layer A′
- , layer B′ and
layer C′
in this order, whereinsaid stretched film has an elongation at break of 120% or less in both the machine direction and the transverse direction as measured according to JIS Z1712, a tensile modulus of 150 to 450 MPa in both the machine direction and the transverse direction as measured according to JIS Z1712, and a thickness of 8 to 15 μ
m,said layers A′ and
C′
, which are surface layers, both have a polypropylene resin content of 60% by weight or more, andsaid layer B′
, which is an intermediate layer, is made of a polyolefin resin or a polyolefin resin mixture.
- , layer B′ and
Specification