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Polypropylene-based resin composition

A technique for polypropylene-based resins and compositions, applied in the field of polypropylene-based resin compositions, capable of solving problems such as large dimensional changes in temperature, poor installability, and gaps, and achieving excellent dimensional stability and injection moldability , excellent mechanical properties

Active Publication Date: 2018-10-23
PRIME POLYMER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since polypropylene molded products generally have a large dimensional change (linear expansion coefficient) with respect to temperature, in an environment with a large difference between cold and warm, for example, when used for automotive exterior panels, there will be gaps at the joints with parts, Or there are problems such as poor mountability during component assembly, that is, there is a so-called gap quality problem.
Therefore, in this field, the high designability and excellent cost-effectiveness of polypropylene moldings have not yet been fully enjoyed

Method used

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  • Polypropylene-based resin composition

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0055] The preparation of the solid titanium catalyst component (I) can also be carried out in the presence of a known medium as needed. Specific examples of the medium include slightly polar aromatic hydrocarbons such as toluene, and known aliphatic or alicyclic hydrocarbon compounds such as heptane, octane, decane, and cyclohexane. Among them, aliphatic hydrocarbons are preferable.

[0056] As the electron donor component (1) used when forming a solid adduct and a liquid magnesium compound, a known compound capable of dissolving a magnesium compound at a temperature range from room temperature to about 300° C. is preferable, for example, alcohol, Aldehydes, amines, carboxylic acids and their mixtures, etc. Examples of these compounds include compounds described in JP-A-57-63310 and JP-A-5-170843.

[0057] Specific examples of alcohols capable of dissolving magnesium compounds include methanol, ethanol, propanol, butanol, isobutanol, ethylene glycol, 2-methylpentanol, 2-eth...

Embodiment

[0163] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to these examples.

[0164] In Examples and Comparative Examples, measurement and evaluation of various physical properties were performed by the following methods.

[0165] [Melt Flow Rate (MFR) (g / 10min)]

[0166] According to ISO 1133, the measurement was carried out under the conditions of a test load of 2.16 kg and a test temperature of 230°C.

[0167] [intrinsic viscosity [η]]

[0168] About 20 mg of the sample was dissolved in 15 ml of decahydronaphthalene, and the specific viscosity η was measured in an oil bath at 135°C. sp . Add 5 ml of decahydronaphthalene solvent to this decahydronaphthalene solution to dilute it, and then perform the same operation to measure the specific viscosity η sp . Repeat this dilution operation twice again to obtain η when the concentration (C) is extrapolated to 0 sp / C value, as the intrinsic viscos...

manufacture example 1

[0188] [Production Example 1] Preparation of Propylene-Ethylene Block Copolymer (A-1)

[0189] (1) Preparation of solid titanium catalyst components

[0190] 95.2 g of anhydrous magnesium chloride, 442 mL of decane, and 390.6 g of 2-ethylhexanol were heated and reacted at 130°C for 2 hours to form a homogeneous solution, and 21.3 g of phthalic anhydride was added to the solution, and further carried out at 130°C. Stir to mix for 1 hour to dissolve the phthalic anhydride.

[0191] After cooling the homogeneous solution to room temperature, 75 mL of the homogeneous solution was added dropwise to 200 mL of titanium tetrachloride maintained at -20°C over 1 hour. After completion of charging, the temperature of the mixed liquid was raised to 110° C. over 4 hours, and after reaching 110° C., 5.22 g of diisobutyl phthalate (DIBP) was added, and the temperature was kept under stirring for 2 hours.

[0192] After completion of the 2-hour reaction, the solid portion was collected by h...

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Abstract

Disclosed are: a polypropylene-based resin composition which comprises 5-47 parts by mass of a propylene-based polymer (A) having an MFR of 50-150 g / 10 min and having a decane-soluble content of 6 mass% or higher, 0-30 parts by mass of a propylene homopolymer (B) having an MFR of 10-500 g / 10 min, 23-30 parts by mass of an ethylene / alpha-olefin copolymer (C) that is a random copolymer of ethylene and a C4-8 alpha-olefin and has a density of 0.850-0.890 g / cm3 and an MFR of 0.5-30 g / 10 min, and 30-40 parts by mass of an inorganic filler (D) having an average particle diameter larger than 3.0 [mu]m but smaller than 5.0 [mu]m (the sum of components (A) to (D) being 100 parts by mass); and an exterior automotive trim member obtained by injection-molding or press-molding the composition.

Description

technical field [0001] The present invention relates to a polypropylene-based resin composition capable of producing molded articles such as automotive exterior members, and the molded article has a low coefficient of linear expansion, high dimensional stability, and excellent surface impact resistance at low temperatures. Background technique [0002] Molded articles obtained by injection molding polypropylene resin compositions are being used in various fields such as automobile parts and home appliance parts because of their excellent mechanical properties and moldability, and relatively favorable cost performance compared with other materials. . [0003] In the field of automotive parts, in addition to using polypropylene as a single component, it is also used: adding ethylene-propylene copolymer (EPR), ethylene-butene copolymer (EBR), ethylene-octene copolymer (EOR) to polypropylene ), styrene-butadiene copolymer (SBR), polystyrene-ethylene / butylene-polystyrene ternary...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/10C08K3/00C08L23/08
CPCC08L23/0815C08K2201/005C08K2201/016C08L2205/03C08F210/06C08L23/12C08L53/00C08K3/013C08K3/34C08F10/06C08F4/6545C08F4/6492C08F4/6465C08F2/001C08F110/06C08F2500/12C08F4/651C08F210/16C08F2500/17C08F2500/35C08L23/10C08F2800/20C08L2205/025
Inventor 箕轮晃高桥周一福田雄介池野裕之
Owner PRIME POLYMER CO LTD
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