Transparentization agent composition containing sorbitol compound and method for producing polypropylene resin composition using this sorbitol compound

Inactive Publication Date: 2012-11-22
ADEKA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010]The object of the present invention is to provide a dibenzylidene sorbitol-based transparentization agent that can form a polypropylene resin c

Problems solved by technology

Among these, dibenzylidene sorbitols are excellent in an effect of improving transparency, but they have defects that they have strong odor, they have a high melting point and thus are difficult to be dispersed homogeneously in resins at a processing temperature, and the like.
Although this dibenzylidene sorbitol is excellent in an effect of improving transparency, it has problems that the flowability is decreased by forming into a micropowder, thereby handling properties such as measuring and charging are decreased, and that expected dispersibility cannot be obtained due to blocking, and the like.
Furthermore, it is actually necessary to prevent secondary aggregation of the micropulverized product by using an inorganic substance, a surface treating agent or the like, and thus the production cost is increased and components that are unnecess

Method used

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  • Transparentization agent composition containing sorbitol compound and method for producing polypropylene resin composition using this sorbitol compound
  • Transparentization agent composition containing sorbitol compound and method for producing polypropylene resin composition using this sorbitol compound
  • Transparentization agent composition containing sorbitol compound and method for producing polypropylene resin composition using this sorbitol compound

Examples

Experimental program
Comparison scheme
Effect test

Example

Synthesis Example

Synthesis of the Dibenzylidene Sorbitol Compound Represented by the General Formula (I)

[0049]To a four-necked reaction flask are added 44 g (0.42 mol) of 3,4-dimethylbenzaldehyde, 38 g (0.21 mol) of sorbitol, 5 g of 50% sulfuric acid as a catalyst, 700 ml of cyclohexane as a solvent and 70 ml of methanol, and stirring is conducted at the reflux temperature of methanol. Methanol of a similar amount to the amount of the volatilized methanol is added dropwise as needed, and a massive substance is obtained by a reaction for 5 hours.

[0050]The obtained massive substance is washed with isopropyl alcohol / water=1 / 1 (volume ratio), and the filtered substance is dried at 90° C. under a reduced pressure.

[0051]The obtained mass was pulverized by a pulverizer to give each dibenzylidene sorbitol powder (it is abbreviated as Sorbitol in Table 1 and Table 2) having d97 described in Table 1 and Table 2. The d97 of the dibenzylidene sorbitol powder was measured by laser light scatter...

Example

Examples 1 to 5 and Comparative Examples 1 to 3

[0052]Each transparentization agent composition was prepared by mixing each of the dibenzylidene sorbitol powders obtained in Synthesis Example (these are abbreviated as Sorbitols in Table 1) and a powder of tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane (this is abbreviated as Phenol in Table 1: ADEKA STAB AO-60 manufactured by ADEKA Corporation was used) by the composition described in Table 1.

[0053]These transparentization agent compositions were each incorporated in a polypropylene resin as follows to give a test piece. In Comparative Example 3, the dibenzylidene sorbitol powder and the powder of tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane were incorporated directly in a polypropylene resin together with other resin additives, without preparing a transparentization agent composition.

[0054]To 100 parts by mass of a random polypropylene (MFI=8 to 10 g / 10 minutes: MG3: manufactured...

Example

Examples 6 to 8 and Comparative Examples 4 to 8

[0057]To 100 parts by mass of a random polypropylene (MFI=8 to10 g / 10 minutes: MG3: manufactured by Japan Polypropylene Corporation) were incorporated 0.1 part by mass of tetrakis[3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane, 0.05 part by mass of tris(2,4-di-tert-butylphenyl)phosphite, 0.05 part by mass of calcium stearate and 0.2 part by mass of the dibenzylidene sorbitol powder having d97 described in Table 2 which was obtained in Synthesis Example, and the mixture was mixed by a Henschel mixer and extrusion-molded by using the extruder described in Table 2 at the extrusion temperature described in Table 2 to give pellets. The obtained pellets were injection-molded at 250° C. to prepare a test piece having a thickness of 1 mm.

[0058]The melt flow index (MFI) at 230° C. under a load of 2.16 kg of the obtained pellets was measured according to JIS K 7210 by using a melt indexer (manufactured by Toyo Seiki Seisaku-Sho, ...

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Abstract

A transparentization agent composition is a mixture containing 100 parts by mass of a dibenzylidene sorbitol compound represented by a general formula (I) having a particle diameter such that d97 is from 30 μm to 200 μm and 5 to 200 parts by mass of tetrakis[3(3,5-di-tert-butyl-4-hydroxyphenyl)propionyloxymethyl]methane, wherein the total for the two components is 50% by mass or more of the mixture. Also disclosed is a method for producing a polypropylene resin composition, including obtaining a polypropylene resin composition in which a dibenzylidene sorbitol compound represented by a general formula (I) having a particle diameter such that d97 is from 30 μm to 200 μm is incorporated in a polypropylene resin, by kneading a mixture containing 100 parts by mass of the polypropylene resin and 0.05 to 2 parts by mass of the dibenzylidene sorbitol compound by using a biaxial extruder at an extrusion temperature of from 220 to 250° C.

Description

TECHNICAL FIELD [0001]The present invention relates to a transparentization agent composition that can form a polypropylene resin composition that is excellent in transparency, by mixing a dibenzylidene sorbitol transparentization agent having a large particle diameter which has been conventionally considered to be not suitable for adding during processing of a polypropylene resin, with a specific phenol antioxidant in advance, prior to mixing with a resin, and adding the mixture to the resin.[0002]Furthermore, the present invention also relates to a method for the production of a polypropylene resin composition that is excellent in transparency, which has enabled incorporation of a dibenzylidene sorbitol transparentization agent having a large particle diameter which has been conventionally considered to be not suitable for adding during processing of a polypropylene resin, by selecting a specific condition for processing.BACKGROUND ART[0003]Polypropylene resins such as propylene h...

Claims

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Application Information

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IPC IPC(8): C08K5/1575C08L23/12C09K3/00B29C48/40B29C48/92
CPCC08K2201/005C08L23/10B29C47/0004B29C2947/92695C08K5/134C08K5/1575B29C2947/92876C08K5/101B29C47/92B29C47/40B29C47/0011B29C2947/922C08L2666/02B29C48/92B29C2948/92704C08K2201/003B29C48/04B29C48/022B29C48/40B29C2948/922B29C2948/92695B29C2948/92876B29C2948/92895C08K5/053C08K5/5415C08K5/0025C08K7/04C08L29/04C09D7/70C04B41/4596C04B41/48E04G23/0296
Inventor HARUNA, TORUTANJI, NAOKOMARTIN, DANIEL YATARO
Owner ADEKA CORP
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