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Biaxially oriented multi-layer film using propylene-ethylene random block copolymer as a surface layer

A random copolymer, biaxially oriented technology, applied in the field of biaxially oriented multilayer films

Active Publication Date: 2005-11-02
JAPAN POLYPROPYLENE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, these improved technologies have not been able to simultaneously satisfy all the following functional requirements, namely heat seal strength, low temperature heat sealability, transparency, smoothness and anti-blocking properties

Method used

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  • Biaxially oriented multi-layer film using propylene-ethylene random block copolymer as a surface layer
  • Biaxially oriented multi-layer film using propylene-ethylene random block copolymer as a surface layer
  • Biaxially oriented multi-layer film using propylene-ethylene random block copolymer as a surface layer

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0169] Preparation of a sample: A sample solution having a concentration of 1 mg / mL was prepared at 140° C. using o-dichlorobenzene (containing 0.5 mg / mL of BHT) as a solvent.

[0170] The amount of components with a molecular weight less than 5000 can be determined by plotting the elution amount against the molecular weight obtained by GPC testing.

[0171] (1-8) Intrinsic viscosity [η]cxs of cold xylene solubles

[0172] The cold xylene solubles (CXS) of the random block copolymer will affect the anti-blocking property when exuding. CXS is a component soluble in xylene at 23°C, so the intrinsic viscosity of CXS is tested.

[0173] Get CXS as follows. The block copolymer samples were dissolved in p-xylene at 130°C and then left at 23°C for 12 hours. The precipitated polymer was removed by filtration, and p-xylene was distilled off from the filtrate to obtain CXS. The intrinsic viscosity ([η]cxs) of the CXS thus obtained was measured at 135°C using decalin as a solvent and ...

Embodiment

[0284] The present invention is further illustrated according to the following examples and comparative examples, but the present invention should not be limited thereto.

[0285] Various physical properties of the block copolymers obtained in the following Examples and Comparative Examples were measured according to the following methods.

[0286] 1) Melt flow rate (MFR)

[0287] According to the method condition M of JIS K7210A, the melt flow rate was tested under the following conditions.

[0288] Test temperature: 230°C

[0289] Nominal load: 2.16kg

[0290] Die shape: diameter 2.095mm, length 8.00mm

[0291] 2) TREF

[0292] The TREF test method is specifically as described above.

[0293] equipment

[0294] (TREF part)

[0295] TREF column: stainless steel column with a diameter of 4.3mm and a length of 150mm

[0296] Column packing: 100μm glass beads with surface inert treatment

[0297] Heating system: aluminum heating block

[0298] Cooling system: Peltier E...

preparation example 1

[0367] Preparation of prepolymerized catalyst

[0368] (chemical treatment of silicates)

[0369] Add 3.75 liters of distilled water to a 10 liter glass separatory flask equipped with a stirrer, and then slowly add 2.5 kg of concentrated sulfuric acid (96%). Disperse 1 kg of montmorillonite (Benclay SL manufactured by Mizusawa Chemical Co., Ltd., average particle size = 25 μm, particle size distribution = 10-60 μm) therein at 50° C., heat the resulting suspension to 90° C., and maintain 6.5 μm at this temperature. Hour. After cooling to 50°C, the suspension was filtered under reduced pressure to recover the filter residue. The filter residue was dispersed with 7 liters of distilled water, followed by filtration. This elution procedure was repeated until the pH of the wash (filtrate) exceeded 3.5. The filter residue thus recovered was dried at 110° C. overnight in a nitrogen atmosphere. After drying, 707 g of silicate were obtained.

[0370] (drying of silicates)

[0371...

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Abstract

A polyolefin based biaxially oriented multi-layer film having at least one surface layer comprise of the propylene-ethylene random block copolymer; The propylene-ethylene random block copolymer obtained through sequential polymerization catalyzed by a metallocene component which is composed of 30 to 70 wt % of a propylene-ethylene random copolymer component having an ethylene content of 1 to 7 wt % produced in the first step of the polymerization and from 70 to 30 wt % of a low crystallinity or an amorphous propylene-ethylene random copolymer component produced in the second step of the polymerization having an ethylene content of 6 to 15 wt % higher than that of the polymer component obtained in the first step, wherein that shows a single peak at 0 DEG C. or lower in the temperature-loss tangent (tandelta) curve obtained by dynamic mechanical analysis (DMA).

Description

technical field [0001] The present invention relates to a biaxially oriented multilayer film using a propylene-ethylene random block copolymer as a skin layer, which has excellent heat seal strength and low-temperature heat sealability, transparency and blocking resistance, and is superior in these properties A good balance has been reached. Background technique [0002] Polyolefin films have excellent physical properties, transparency, processability, economy, and low environmental load, so they are widely used as packaging materials in many fields, mainly for food, daily necessities, medicines, sundries, etc. [0003] In addition, packaging materials are required to have multiple functions, so many kinds of films are used, such as oriented films with excellent strength and hardness, heat-shrinkable films for adhesive packaging, air-impermeable films for storage, and boil-sterilized Distilled membranes, etc. [0004] Among these functions, one of the most important functi...

Claims

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Application Information

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IPC IPC(8): B29C55/12B29K23/00B29L9/00B32B27/32
CPCB32B27/32B32B27/08B32B2307/31B32B2307/412B32B2307/518B32B2307/704B32B2307/746B32B2439/70B32B2439/80
Inventor 田谷野孝夫高桥邦宣香西育北出慎一水上茂雄平山浩一
Owner JAPAN POLYPROPYLENE CORP
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