Biaxially oriented polypropylene film

A biaxially oriented film, polypropylene technology, applied in the field of biaxially oriented polypropylene film, can solve the problems of unsatisfactory dimensional stability and anti-blocking property

Inactive Publication Date: 2005-08-24
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The conventional biaxially oriented films mentioned above are unsatisfactory in rigidity and dimensional stability and anti-blocking properties at high temperature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] [Preparation of solid catalyst]

[0071] After replacing the air in a 200-L SUS reactor equipped with a stirrer, 80 L of hexane, 6.55 moles of titanium tetrabutoxide, 2.8 moles of diisobutyl phthalate and 98.9 moles of tetraethoxysilane were charged to form a homogeneous phase solution. Then, 51 L of a 2.1 mol / L diisobutyl ether solution of butylmagnesium chloride was slowly added dropwise over 5 hours while maintaining the reactor temperature at 5°C. After the dropwise addition was completed, the mixture was further stirred at room temperature for 1 hour. Subsequently, the mixture was subjected to solid-liquid separation at room temperature and washed with three 70 L portions of toluene.

[0072] Then, the toluene was drained so that the concentration of the slurry became 0.6 kg / L. Thereafter, a mixture of 8.9 moles of di-n-butyl ether and 274 moles of titanium tetrachloride was added, followed by 20.8 moles of phthaloyl chloride. The reaction was carried out at 11...

Embodiment 2

[0087] Propylene-1-butene copolymers, pellets and biaxially oriented films were produced in the same manner as in Example 1, except that the gas composition in the gas phase and the catalyst concentration used in the polymerization process were changed as shown in Table 1. The basic physical properties of the pellets and the physical properties of the biaxially oriented film are summarized in Table 2 and Table 3, respectively.

Embodiment 3

[0089] Propylene-1-butene copolymers, pellets and biaxially oriented films were produced in the same manner as in Example 1, except that the gas composition in the gas phase and the catalyst concentration used in the polymerization process were changed as shown in Table 1. The basic physical properties of the pellets and the physical properties of the biaxially oriented film are summarized in Table 2 and Table 3, respectively.

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PUM

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Abstract

Disclosed is a biaxially oriented film made of a thermoplastic material containing a polypropylene satisfying the following requirements (1), (2) and (3): (1) the polypropylene has a melting point from 150 DEG C. to 165 DEG C., (2) the 20 DEG C. xylene-soluble fraction content in the polypropylene is from 0.1% by weight to 2% by weight, (3) the polypropylene has a melt flow rate from 0.1 g / 10 min. to 10 g / 10 min., wherein the film satisfies the following formula (I): Y<=-850*S+7000 (I), wherein S represents the thermal shrinkage of the film in the longitudinal direction (MD) at 130 DEG C. and Y represents the Young's modulus of the film in the transverse direction (TD), and wherein the thermal shrinkage of the film in the MD at 120 DEG C. is 3% or less.

Description

technical field [0001] The present invention relates to biaxially oriented polypropylene films, in particular biaxially oriented polypropylene films having excellent rigidity combined with excellent dimensional stability and anti-blocking properties at high temperatures. Background technique [0002] Biaxially oriented polypropylene films are used in a variety of applications because they are economical, have excellent clarity, moisture resistance, and chemical stability, among others. [0003] For example, Japanese Patent Application Unexamined Publication No. 59-149909 discloses a propylene copolymer in which the 1-butene content (Bc) is 0.1 to 2.5 mol%, and the isotactic value (Iso) is in the following formula ( 1) and (2) within the limits: [0004] When 0.1≤Bc≤0.3mol%, Iso≥-5Bc+96.3 (1) [0005] When 0.3<Bc≤2.5 mol%, Iso≥-0.60Bc+95.0 (2) The copolymer is reported to have excellent stretchability, impact resistance, heat shrinkage resistance, transparency and rigidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C55/12C08F10/00C08F110/06C08F210/06C08J5/18C08L23/10C08L23/14
CPCC08F110/06C08J5/18C08J2323/12C08F210/06C08F4/6565C08F4/6492C08F2500/12C08F2500/26C08F210/16C08F210/08
Inventor 堀英明江原健小畑洋一
Owner SUMITOMO CHEM CO LTD
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