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Propylene random copolymer and stretched film prepared from propylene random copolymer

A technology of random copolymer and propylene, applied in the field of stretch film, can solve the problems of affecting the surface smoothness and optical properties of the film, affecting the fastness and transparency of the metal coating, and reducing the mechanical properties of the film, etc. High density and good film forming performance

Inactive Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a large amount of ethylene or greatly reducing the isotacticity will cause a decrease in the mechanical properties (such as stiffness) of the film and an increase in the soluble content, etc.
Soluble substances will increase the cooling and deposits on the conveying rollers during film processing, which not only affects the surface finish and optical properties of the film, but also causes parking and cleaning, which affects the continuity of processing. The application in the field will also affect the fastness and transparency of the metal coating over time.

Method used

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  • Propylene random copolymer and stretched film prepared from propylene random copolymer
  • Propylene random copolymer and stretched film prepared from propylene random copolymer
  • Propylene random copolymer and stretched film prepared from propylene random copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Polymerization was carried out on a set of pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor. Polymerization method and steps are as follows:

[0046] (1) Prepolymerization reaction:

[0047] The main catalyst (titanium-containing active solid catalyst component) is obtained by the method described in Example 1 of Chinese Patent CN93102795.0, wherein the internal electron donor compound adopts diisobutyl phthalate, and the obtained main catalyst Ti content 2.2wt%, diisobutyl phthalate content 11.2wt%.

[0048] After the main catalyst, co-catalyst (triethylaluminum) and external electron donor (methylcyclohexyldimethoxysilane) are pre-contacted at 10°C for 20 minutes, they are continuously added to the pre-polymerization reactor for pre-polymerization reaction. It is carried out under the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under...

Embodiment 2

[0056] Same as Example 1, except that the amount of butene-1 added is changed, see Table 1 for the specific process conditions, and see Tables 3 and 4 for the related properties of the cast sheet and film.

Embodiment 3

[0058] Same as Example 1, except that the amount of butene-1 added is changed, see Table 1 for the specific process conditions, and see Tables 3 and 4 for the related properties of the cast sheet and film.

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Abstract

The invention relates to a propylene-butene-1 random copolymer, a preparation method for the propylene-butene-1 random copolymer and a stretched film prepared from the propylene-butene-1 random copolymer. For the propylene-butene-1 random copolymer, the content of butane-1 is 0.2-3 mol%, the content of a dimethylbenzene soluble substance under room temperature is lower than 3wt%, the molecular weight distribution index MW / Mn is in the range of 4-8, the melting temperature of a casting sheet is less than 160 DEG C, and the melting enthalpy of the casting sheet is larger than 78J / g; the propylene-butene-1 random copolymer has low content of the soluble substance and good film-forming processing property; and compared with the stiffness of homopolymerization polypropylene, the stiffness of the stretched film prepared from the propylene random copolymer is still not reduced and the stretched film has better transparency.

Description

technical field [0001] The invention relates to a propylene random copolymer and a stretched film prepared therefrom, in particular to a propylene-butene-1 random copolymer, a preparation method thereof and a stretched film prepared therefrom. Background technique [0002] Polypropylene film is widely used in the field of packaging materials due to its excellent optical properties, mechanical properties and packaging adaptability. In particular, biaxially oriented polypropylene film (BOPP) has a wide range of uses due to its soft quality, high transparency, non-toxic water resistance and high mechanical strength. The optical properties, mechanical properties, and soluble content of BOPP determine its performance, and these indicators are closely related to the molecular structure control of raw materials. [0003] In the prior art, when producing BOPP special resin, in order to meet the requirements of optical properties, a relatively large amount of ethylene is added or th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F210/08C08F4/646C08L23/14B32B27/32B65D65/40
Inventor 郭梅芳宋文波张师军乔金樑侯莉萍魏文俊高达利孔德辉唐毓婧施红伟
Owner CHINA PETROLEUM & CHEM CORP