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Polypropylene resin composition, film or sheet, stretched film obtained from such film or sheet, multilayer body, and stretched film obtained from such multilayer body

A polypropylene resin, propylene polymer technology, applied in synthetic resin layered products, layered products, transportation and packaging, etc., can solve problems such as poor, sticking to the appearance of the film on the roll, and achieve good blocking resistance and transparency. Excellent properties and excellent transparency

Inactive Publication Date: 2008-07-30
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, although excellent low-temperature heat-sealability can be obtained by using such a low-melting propylene copolymer, there are problems such as a phenomenon of sticking to a roll when formed into a film or sheet or a phenomenon of poor appearance of the produced film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] A resin composition obtained by melt-kneading the following raw materials: 10% by weight of homopolypropylene with a melting point of 161° C. and an MFR of 7.0 g / 10 minutes; a melting point of 138° C. and an MFR of 7.0 g / Propylene-ethylene-1-butene copolymer (random polypropylene) 60% by weight for 10 minutes; MFR is 7.0 g / 10 minutes, melting point is 75° C., 1-butene content is 23 mol % using a metallocene catalyst The obtained propylene-1-butene copolymer is 30% by weight, and a homopolypropylene having a melting point of 161° C. and an MFR of 3.0 g / 10 minutes is used as the core layer resin, and the die width of the extruder equipped with 30 mmφ and 25 mmφ is used. 2 kinds of 2-layer T-die forming machines of 200mm, and a multilayer sheet having a thickness of 1mm was produced. Here, the thickness of the heat-sealing layer is set to 0.1 mm, and the thickness of the core layer is set to 0.9 mm.

[0115] Using a biaxial stretching machine, under the conditions of 160...

Embodiment 2、3、4、 comparative example 1、2、3

[0118] Except having adopted the composition described in Table 1 as a resin composition, the same operation as Example 1 was performed, and the film was obtained.

[0119] In Table 1 and Table 2, the physical properties of the produced films are shown.

[0120] [Table 1]

[0121] Example 1

Example 2

Comparative example 1

Comparative example 2

resin composition

m-PBR (wt%)

h-PP (wt%)

r-PP (wt%)

30

10

60

30

30

40

30

70

-

30

-

70

Haze (%) (4 overlapping)

4.0

4.2

4.2

5.1

Adhesion coefficient

(N / m)

0.25

0.08

0

0.50

Heat seal strength (N / 15mm)

80°C

90°C

100°C

110°C

120°C

130°C

5.39

6.05

6.64

7.21

...

Embodiment 5、6、 comparative example 4、5

[0133] Instead of a propylene-1-butene copolymer, a 1-butene-ethylene copolymer (BEAULON (registered trademark) BL3450 manufactured by Mitsui Chemicals, Inc., hereinafter, sometimes referred to as BER) was used as a component, and used as described in Table 3. Except having used the resin composition obtained by BER, h-PP and r-PP, the same operation as Example 1 was performed, and the film was obtained. Table 3 shows the physical properties of the produced film.

[0134] [table 3]

[0135] Example 5

Example 6

Comparative example 4

Comparative Example 5

resin composition

BER (wt%)

h-pp (wt%)

r-pp (wt%)

15

10

75

30

10

60

30

70

-

30

-

70

Haze (%) (4 overlapping)

5.7

4.2

5.6

9.3

Adhesion coefficient

(N / m)

1.16

1.52

0.40

0.77

...

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Abstract

Disclosed is a polypropylene resin composition which has good moldability and enables to obtain a film or sheet having excellent transparency and heat sealing property. Specifically disclosed is a polypropylene resin composition composed of 1-50% by weight of a propylene polymer (A) having a melting point Tm as measured by a differential scanning calorimeter (DSC) of not less than 150 DEG C, 10-90% by weight of a propylene copolymer (B) having a melting point Tm of not less than 100 DEG C but less than 150 DEG C, and 1-80% by weight of an olefin copolymer (C) having a melting point of not less than 40 DEG C but less than 100 DEG C. The olefin copolymer (C) is composed of (a) not less than 50% by mole of either of a constitutional unit derived from propylene and a constitutional unit derived from 1-butene, and (b) not more than 50% by mole of one or more constitutional units other than (a) selected from constitutional units derived from a-olefins having 2-20 carbon atoms (with the total of (a) and (b) being 100% by mole). A film obtained from such a resin composition is suitable as a packaging film for foods or the like.

Description

technical field [0001] The present invention relates to a polypropylene resin composition, a film or sheet produced therefrom, a stretched film produced therefrom, a laminate, and a stretched film produced therefrom. Background technique [0002] Crystalline polypropylene has excellent mechanical properties such as tensile strength, rigidity, surface hardness, impact strength, and cold resistance, optical properties such as gloss and transparency, and food hygiene properties such as non-toxicity and odorlessness. It is widely used in the field of food packaging. [0003] As a method for improving the heat-sealability of such crystalline polypropylene, generally, a multilayer or single-layer film comprising a heat-sealing layer using a low-melting polypropylene such as a propylene-α-olefin copolymer is known. [0004] JP-A-61-42626 describes that a film having excellent low-temperature heat-sealability can be obtained by using a composition composed of polypropylene and a pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10B32B27/32
CPCC08L23/20C08L23/142Y10T428/31913C08L2205/03C08L23/10B32B27/32C08L2205/02C08L2666/06C08L2666/02C08J5/18C08L2203/16
Inventor 井上则英黑木孝行
Owner MITSUI CHEM INC
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