Modified polypropylene, its preparation method, its composite and foamed product

A polypropylene composition and polypropylene technology, which are applied in the field of foamed products, can solve the problems of no disclosure of formula, no disclosure to accurately control the performance of foamed products, poor surface appearance of foamed sheets, etc.

Inactive Publication Date: 2002-03-27
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this literature, only the modification obtained by mixing a propylene homopolymer, a polypropylene block copolymer, a polypropylene random copolymer and several peroxydicarbonates in certain proportions is described. Polypropylene resins, neither disclosing formulations of resins with properties suitable for foam molding, nor disclosing recommendations for accurate control of foamed product properties
Moreover, from the compositions described in WO99 / 27007 all that can be obtained is a foamed sheet with a poor surface appearance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0274] Under the conditions of a resin temperature of 190° C. and a screw speed of 150 rpm (average residence time: 30 seconds), a twin-screw extruder (KZW25-30MG, manufactured by Technovel Co., Ltd., screw diameter 31 mm, L / D=30) 100 parts by weight of a propylene homopolymer (trademark: J104, available from Grand Polymer Co., Ltd., MFR: 8.0 g / 10 min, hereinafter sometimes referred to as "polypropylene (a)" ) and 1.0 parts by weight of bis(4-tert-butylcyclohexyl)peroxydicarbonate (trademark: Perkadox 16, available from KAYAKU AKZO Co., Ltd.) as a peroxide were melt-kneaded, and then the kneaded material was melt-extruded To obtain modified polypropylene (1) pellets.

[0275] The MFR and melt tension of the modified polypropylene (1) pellets were measured by the above method, and the gel fraction thereof was calculated by the above method. The results are listed in Table 1, where the molecular weight distribution of the modified polypropylene (1) is also listed for reference....

Embodiment 2 and 3

[0277] Modified polypropylene (2) and modified polypropylene (3) were obtained in the same manner as in Example 1, except that the amount of peroxide was changed to one of 1.5 parts by weight and 0.5 parts by weight. The results are listed in Table 1.

Embodiment 4

[0291] 100 parts by weight of modified polypropylene (1) pellets and 3 parts by weight of foaming agent masterbatch (trademark: PE-RM410EN can be obtained from Dainichi Seika Co., Ltd., sodium bicarbonate / citric acid mixture) was mixed for 3 minutes. The mixture was molded with a 65 mm single-screw extruder (L / D=28) equipped with a circular die (diameter: 80 mm) and a core (diameter: 190 mm) at the tip to prepare a thickness of 0.8 mm tubular foam sheet. The expansion ratio of the tubular foamed sheet in these production machines was 2.4. Cut the tubular foam sheet on one side, and pull it into a flat plate according to the pulling mechanism.

[0292] The expansion ratio, appearance, cell shape and formability (vacuum formability) of the obtained foamed sheet were measured. The results are listed in Table 2.

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PUM

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Abstract

A modified polypropylene has a melt flow rate of 0.1 to 10 g / 10 min, a melt tension of 3 to 20 g and a gel fraction, as determined by boiling paraxylene extraction, of 0.01 to 25% by weight. The modified polypropylene, a process for preparing the modified polypropylene, and a modified polypropylene composition containing the modified polypropylene are capable of producing a foamed product having excellent foam properties and food hygienic qualities. The foamed product obtained from the modified polypropylene or the modified polypropylene composition is lightweight, highly rigid and excellent in chemical resistance and food hygienic qualities, and hence it can be used for food packaging containers and trays, particularly containers of noodles or ice cream and trays of fish or meat, for which polystyrene has been heretofore used.

Description

field of invention [0001] The invention relates to a modified polypropylene, a method for preparing the modified polypropylene, a modified polypropylene composition containing the modified polypropylene, and a foamed product obtained from the modified polypropylene or the modified polypropylene composition. Background of the invention [0002] Since foamed products made of thermoplastic resins are generally lightweight and have excellent heat insulating properties and cushioning properties against external stress, they are widely used as heat insulating materials, cushioning materials, core materials, food containers, and the like. Of course, foamed products made of polypropylene not only have excellent chemical resistance, impact resistance and heat resistance, but also have excellent food hygiene characteristics, so their use as trays for fresh food has been studied. [0003] However, polypropylene is a crystalline resin and thus has low viscosity and low melt tension when...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/00C08K5/14
CPCC08K5/14C08F8/00C08F10/06
Inventor 是久金造秋山直也桥本干夫胁田阳一
Owner MITSUI CHEM INC
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