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Polypropylene resin composition

a polypropylene resin and composition technology, applied in the field of polypropylene resin composition, can solve the problems terribly and inferior moldability of polypropylene resins, and achieve the effect of lowering the melt tension and high melt tension

Inactive Publication Date: 2009-08-13
BASSELL POLIOLEFINE ITAL SRL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides polypropylene resin compositions that have improved properties such as high melt tension, color stability, and reduced melt flow rate. These compositions can be obtained by blending polypropylene resin with specific rubber components and then treating them with ionization ray-irradiation and / or organic peroxide. The addition of certain metal compounds further enhances the properties of the resin composition. The invention also provides a method for recycling the resin composition by melting it and adding a nucleating agent.

Problems solved by technology

However, the polypropylene resins have a disadvantage of being inferior in moldability such as extrusion molding, foam molding, blow molding, and so forth.
These conventional methods each improve part of characteristics of the polypropylene resins, but are insufficient in melt tension, leave still a defect of lowering the melt tension when the resins are re-melted for recycling.
In addition, the method of using an organic peroxide has the disadvantages of causing odors because of use of a crosslinking additive, terribly lowering the melt tension after being re-melted, and causing coloring with formulations of additives.
In order to solve these problems, a method of storing at 40° C. or below after irradiating with ionization rays, a method of storing in an atmosphere of nitrogen, or a method of heat treating in an atmosphere of nitrogen or under vacuum after irradiation makes the improvement possible, but each has problems in costs and quality control.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

examples

[0073]Hereinafter concrete examples are shown to further illustrate the invention.

[0074]In the following examples, physical properties each are measured by the following methods.[0075]1. Measurement of the MFR of the polypropylene resins or the polypropylene resin compositions: Measured according to JIS K7210 with Appendix A Table 1 and condition M.[0076]2. Measurement of the MFR of the polyethylene resins: Measured according to JIS K7210, with Appendix A Table 1 and condition D.[0077]3. Density was found by the gradient tube density determination.[0078]4. Content of comonomers: found by nuclear magnetic resonance (13C-NMR) and with a infrared spectrophotometer.[0079]5. Intrinsic viscosities [η] were measured in tetralin at 135° C.[0080]6. A carboxyl group or a carbonyl group was checked by nuclear magnetic resonance (13C-NMR) or with a infrared spectrophotometer.[0081]7. Melt tension:[0082]By use of a melt tension tester model 2 manufactured by Toyo Seiki Seisakusho K. K., strands ...

examples 1 to 5 (

First Embodiment of the Invention) And Comparative Examples 1 to 7

[0097]The polypropylene resins and the olefin copolymer rubbers as shown in the following Table 1 were used as component (A) and component (B), respectively. To these, 0.05 weight part of tetrakis[methylene-3-(3′,5′-di-t-hydroxyphenyl)-propionate]methane, 0.03 weight part of tris(2,4-di-t-butylphenyl)phosphite, and 0.08 weight part of calcium stearate were added, and formed into pellets by use of an extruder of 40 mmφ manufactured by Yoshii Tekko K. K. at a temperature of 210° C.

[0098]The resulting pellets were irradiated with γ-rays by use of a γ-ray irradiation apparatus (manufactured by Koga Isotope Co.) in irradiation doses as shown in Table 1 in an atmosphere of air to obtain polypropylene resin compositions of the invention. The MFR, the melt tension, and the coloring were checked about these polypropylene resin compositions (The compositions of Examples 1 to 5 having undergone the γ-ray irradiation treatment ar...

examples 6 to 9 (

First Embodiment of the Invention)

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Abstract

A polypropylene resin composition comprising (A) 99.8 to 80 weight parts of a polypropylene resin having a melt flow rate of 0.1 to 50 g / 10 min and (B) 0.2 to 20 weight parts of an olefin copolymer rubber having an intrinsic viscosity [η] of 0.5 to 4.0 dl / g and / or a polyethylene resin having a density of 0.895 to 0.945 g / cc and a melt flow rate of 0.05 to 15 g / 10 min, which have undergone an ionization ray-irradiation treatment and / or a treatment of adding 0.05 to 5 weight parts of an organic peroxide to 100 weight parts of the aforesaid polypropylene resin composition comprising (A) and (B) and then melting.

Description

[0001]This application is the U.S. national phase of International Application PCT / EP02 / 05560, filed May 21, 2002.FIELD OF THE INVENTION[0002]The present invention relates to a polypropylene resin composition excellent in high melt tension, stiffness, and moldability. Particularly, the invention relates to a polypropylene resin composition high in the melt tension, good in stiffness, small in lowering of melt tension after re-melting, and particularly excellent in recycling properties.BACKGROUND OF THE INVENTION[0003]Polypropylene resins are inexpensive in general and are widely used as industrial materials for automobile parts and electrical and electronic parts and a variety of packaging materials utilizing properties such as lightweight, chemical resistance, acid resistance, thermal resistance, and so forth.[0004]In the field of packaging materials, the polypropylene packaging materials in particular require high functionality in order to cope with environmental problems, and imp...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C08K5/00C08L23/12C08F8/00C08F8/50C08F110/06C08F210/06C08K3/22C08K5/057C08K5/14C08K5/49C08L23/10
CPCC08F110/06C08J3/28C08K3/22C08K3/2279C08K5/0091C08K5/057C08K5/14C08L23/10C08L2205/02C08F210/06C08F2800/20C08F2810/10C08J2323/10C08L2666/04C08F2500/12C08F2500/11C08F2500/17C08F210/16C08F8/50C08F110/02
Inventor IWASHITA, TOSHIYUKI
Owner BASSELL POLIOLEFINE ITAL SRL