Propylene resin composition for retort pouch-packaging film
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A technology of propylene resin and composition, applied in the production of adhesives and bulk chemicals, etc., can solve the problems of poor dispersion of rubber components, narrow molecular weight distribution, and no mention of it
Inactive Publication Date: 2015-06-24
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Copolymers polymerized using phthalate-based catalysts have the following problems: the molecular weight distribution is slightly narrow, and the dispersion of the rubber component in the copolymer is poor
[0012] In the above cited documents, solid catalyst systems containing various succinate compounds (compounds having a succinate structure) are disclosed. The specific properties of the polymer composition are not mentioned
Method used
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[0087] The following examples are given to further illustrate the present invention. In addition, each analysis in an Example was performed by the following method.
[0088] [MFR]
[0089] According to JIS K 7210, it measured on the conditions of temperature 230 degreeC, and load 21.18N.
[0090] [Propylene Concentration in Copolymer]
[0091] For the sample dissolved in a mixed solvent of 1,2,4-trichlorobenzene / deuterated benzene, JNM LA-400 ( 13 C resonant frequency is 100MHz), through 13 C-NMR method for determination.
[0092] [Xylene insoluble components]
[0093] Add 2.5 g of the propylene resin composition to a flask with 250 mL of o-xylene (solvent), and use a heating plate and a reflux device to perform nitrogen purge at 135° C. while stirring for 30 minutes to completely dissolve the resin composition. , cooled at 25°C for 1 hour. The obtained solution was filtered using filter paper. Acetone was added to the residue remaining on the filter paper at this time...
Embodiment 3 and 4 and comparative example 4～6
[0141] The propylene resin compositions obtained in Polymerization Examples 1 and 2 and Comparative Polymerization Examples 1 to 3 were molded by an inflation method to produce a sealing film with a thickness of 60 μm.
[0142] The properties of the propylene resin compositions obtained in the respective polymerization examples and comparative polymerization examples and the properties of the obtained films are summarized in Table 2 below as Examples 3 and 4 and Comparative Examples 4 to 6.
[0143] [Table 2]
[0144]
[0145] Compared with the propylene resin composition of Comparative Example, the propylene resin composition of the present invention has high molding stability. When the propylene resin compositions of Comparative Polymerization Examples 2 and 3 were molded, some sloshing of bubbles was observed. In addition, when the propylene resin composition of Comparative Polymerization Example 1 was molded, the bubble sloshing was large, and a film sample could not b...
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Abstract
The present invention addresses the problem of producing: a propylene resin composition which has high molding processability and therefore can be formed into a film steadily; and a sealant film for retort pouch-packaging use which is formed from the propylene resin composition and has high seal strength. The problem can be solved by a propylene resin composition which is produced by polymerizing propylene and ethylene using a catalyst comprising (A) a solid catalyst containing an electron-donating compound selected from magnesium compounds, titanium compounds, halogen compounds and succinate-type compounds as an essential component, (B) an organoaluminum compound and (C) an external electron-donating compound selected from silicon compounds, and which has such a structure that a propylene-ethylene copolymer is dispersed in a propylene homopolymer, said propylene resin composition fulfilling the requirements represented by the following values: the amount of the ethylene-propylene copolymer in the propylene resin composition is 25 to 35 wt%; the content of propylene in the copolymer is 60 wt% or more; the intrinsic viscosity [η] of a xylene-soluble fraction of the propylene resin composition is 1.8 to 3.2 dl / g; and the melt flow rate of the propylene resin composition is 2.0 to 5.0 g / 10 min.
Description
technical field [0001] The present invention relates to a propylene-based resin composition used for a retort film. Specifically, the present invention relates to a propylene-based resin composition suitable as a sealing material for retort films, which has excellent sealing properties, orange peel resistance, and wettability, and has low occurrence of fish eyes and low amount of extracted components. Background technique [0002] Polypropylene, which is inexpensive and excellent in rigidity, moisture resistance, and heat resistance, is widely used in various industrial fields. In particular, propylene-based resin compositions are used to manufacture molded articles, especially sheet-shaped molded articles for packaging applications such as food packaging and fiber packaging, because of their excellent appearance, mechanical properties, and packaging adaptability. [0003] Patent Document 1 discloses an ethylene-propylene copolymer polymerized using a Ziegler-Natta type cat...
Claims
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