Propylene based resin composition and use thereof

Patent metadata

Field	Value
Publication number	US-9969853-B2
Application number	US-201514931996-A
Country	US
Kind code	B2
Filing date	Nov 4, 2015
Priority date	Nov 25, 2004
Publication date	May 15, 2018
Grant date	May 15, 2018

Abstract

Means for solving the problems
The thermoplastic resin composition (X1) of the present invention comprises (A1), (B1), (C1), and optionally (D1) below:
1 to 90 wt % of an isotactic polypropylene (A1); 9 to 98 wt % of a propylene/ethylene/α-olefin copolymer (B1) containing 45 to 89 mol % of propylene-derived structural units, 10 to 25 mol % of ethylene-derived structural units, and optionally, 0 to 30 mol % of C 4 -C 20 α-olefin-derived structural units (a1); 1 to 80 wt % of a styrene-based elastomer (C1); and 0 to 70 wt % of an ethylene/α-olefin copolymer (D1) whose density is in the range of 0.850 to 0.910 g/cm 3 , wherein (A1)+(B1)+(C1)+(D1)=100 wt %.

First claim

The invention claimed is:

1. A single-layer or multi-layer film comprising at least one layer that is made of a resin composition (X4) comprising (A4) and (B4) below and monoaxially or biaxially oriented:
50 to 97 wt % of an isotactic polypropylene (A4); and
3 to 50 wt % of a propylene/ethylene/α-olefin copolymer (B4) containing 40 to 85 mol % of propylene-derived structural units, 5 to 30 mol % of ethylene-derived structural units, and 5 to 30 mol % of C 4 -C 20 α-olefin-derived structural units (a4), the melting point of (B4) being lower than 100° C. or not observed when measured with a differential scanning calorimeter, the triad tacticity (mm-fraction) of (B4) measured by 13 C-NMR being 85% or more,
wherein, the total of (A4) and (B4) is 100 wt %.

2. A heat-shrinkable film comprising the film according to claim 1 .

3. A single-layer or multi-layer film comprising at least one layer that is made of a resin composition (X4) comprising (A4) and (B4) below and monoaxially or biaxially oriented:
10 to 97 wt % of an isotactic polypropylene (A4); and
3 to 90 wt % of a propylene/ethylene/α-olefin copolymer (B4) containing 40 to 85 mol % of propylene-derived structural units, 5 to 30 mol % of ethylene-derived structural units, and 5 to 30 mol % of C 4 -C 20 α-olefin-derived structural units (a4), the melting point of (B4) being lower than 100° C. or not observed when measured with a differential scanning calorimeter,
wherein, the total of (A4) and (B4) is 100 wt %, and
wherein the resin composition (X4) further comprises a hydrocarbon resin (C4) having a softening point of 50° C. to 160° C. as measured with the ring-and-ball method and a number-average molecular weight of 300 to 1400 as measured by gel permeation chromatography (GPC) in an amount of 3 to 70 parts by weight relative to 100 parts by weight of the total of (A4) and (B4).

4. A heat-shrinkable film comprising the film according to claim 3 .

5. A resin composition (X4) comprising:
10 to 97 wt % of an isotactic polypropylene (A4);
3 to 90 wt % of a propylene/ethylene/α-olefin copolymer (B4) containing 40 to 85 mol % of propylene-derived structural units, 5 to 30 mol % of ethylene-derived structural units, and 5 to 30 mol % of C 4 -C 20 α-olefin-derived structural units (a4), the melting point of (B4) being lower than 100° C. or not observed when measured with a differential scanning calorimeter,
wherein the total of (A4) and (B4) is 100 wt %; and
a hydrocarbon resin (C4) having a softening point of 50° C. to 160° C. as measured with the ring-and-ball method and a number-average molecular weight of 300 to 1400 as measured by GPC in an amount of 3 to 70 parts by weight relative to 100 parts by weight of the total of (A4) and (B4).

Assignees

• Mitsui Chemicals Inc

Inventors

• Hoya Hiroshi
• Noda Kiminori
• Inoue Norihide
• Uehara Hiroshi
• Shiba Eiji
• Yamaguchi Masayoshi
• Kawamoto Manabu
• Yamashita Akira

Classifications

• C08J2323/14

  Copolymers of propene (C08J2323/16 takes precedence) · CPC title

• C08J2423/14

  Copolymers of propene (C08J2423/16 takes precedence) · CPC title

• B32B27/32

  comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)} · CPC title

• Y10T428/31692

  Next to addition polymer from unsaturated monomers · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title