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Foaming polystyrene series resin particle and its manufacturing method, foaming shaped article and foodstuff package

A technology of polystyrene and resin particles, applied in packaging and other directions, can solve the problems of insufficient oil tolerance, leakage, and inability to fully resolve, and achieve the effect of high cross-linking density and excellent oil resistance

Inactive Publication Date: 2009-04-15
SEKISUI PLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] When such a foamed container is used as a beverage cup such as coffee, although there is no practical obstacle, there is a problem that oily foods such as donuts, In the case of hamburgers, fried chicken, salad oil such as margarine, and foods containing fats and oils, the oil components contained in these oily foods will ooze to the outside through the capillary formed in the foam molding container
[0016] However, the expandable styrenic polymer particles produced by the above-mentioned production method are effective for blocking the gaps between the pre-expanded particles of the expanded molded article obtained by using the expandable styrenic polymer particles, However, the above-mentioned problem of oil components and butter colorants oozing to the outside through the capillary formed by the foam-molded container cannot be sufficiently solved due to insufficient resistance to oil components.

Method used

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  • Foaming polystyrene series resin particle and its manufacturing method, foaming shaped article and foodstuff package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] 2.0 L of ion-exchanged water, 1.5 kg of polystyrene seeds with an average particle diameter of 0.3 mm and a weight average molecular weight of 280,000, and 20 g of magnesium pyrophosphate were supplied to a stainless steel 5 L autoclave equipped with a stirring device. and 1 g of sodium dodecylbenzenesulfonate were stirred at a speed of 300 revolutions per minute to prepare a dispersion.

[0076] Dissolve 2.0 g of divinylbenzene as a crosslinkable monomer, 2.0 g of benzoyl peroxide (10-hour half-life at 74°C) and 1.0 g of tert-butyl peroxybenzoate (10-hour half-life at 104°C) in 500 g In the styrene monomer, a monomer solution is prepared.

[0077] Next, the above-mentioned dispersion liquid was kept at 85° C., and the inside of the reaction container was replaced with nitrogen gas, and then the above-mentioned monomer solution at room temperature was continuously supplied to the dispersion liquid for 2 hours. When the total of the polystyrene seed and the styrene mono...

Embodiment 2

[0081] Dissolve 1.1kg of polystyrene seeds, 4.5g of divinylbenzene, 3.6g of benzoyl peroxide and 1.0g of tert-butyl peroxybenzoate in 900g of styrene monomer to prepare a monomer solution. The monomer solution was used for 3 hours, except that the supply amount of the monomer solution was set at a ratio of 15.2 parts by mass, and the same procedure as in Example 1 was followed.

Embodiment 3

[0083] Dissolve 1.65kg of polystyrene seeds, 1.8g of divinylbenzene, 1.4g of benzoyl peroxide and 1.0g of tert-butyl peroxybenzoate in 350g of styrene monomer to prepare a monomer solution. The monomer solution was used for 2 hours, except that the supply amount of the monomer solution was set at a ratio of 8.9 parts by mass, and the procedure was the same as in Example 1.

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Abstract

The invention provides expandable polystyrene resin particles being capable of giving an expanded molding proof against exudation of oils and coloring matters and being excellent in expandability, to provide a method for producing the same, to provide an expanded molding obtained therefrom, and to provide a packaged food prepared by packaging food in the expanded molding. The expandable polystyrene resin particles are characterized in that an outer layer of a polystyrene resin formed by polymerizing a styrene monomer containing a crosslinkable monomer is formed on the surface of a polystyrene resin particle, an easily volatile blowing agent is infiltrated into the particles, the gel fraction of the polystyrene resin constituting the particles is 10 to 50 mass%, the ratio (Mw1 / Mw2) lies in the range of 0.5 to 0.8 (wherein Mw1is the weight-average molecular weight of the polystyrene resin extracted with tetrahydrofuran; and Mw2is the weight-average molecular weight of the polystyrene resin extracted after splitting each particle into two; and Mw2lies in the range of 150,000 to 400,000).

Description

technical field [0001] The present invention relates to expandable polystyrene resin particles and a method for producing the same, foamed molded articles manufactured using the expandable polystyrene resin particles, and containers containing the foamed molded articles that pack food Food packaging. Background technique [0002] Conventionally, expandable polystyrene-based resin particles impregnated with a foaming agent in styrene-based resin particles are pre-foamed to produce pre-expanded particles, and the pre-expanded particles are filled into a molding die of a molding machine. , and then heated to make them foam and fuse together to produce a foamed container with the desired shape. [0003] As mentioned above, the expansion-molded container is formed by preparatory expansion of the foaming particles themselves through the foaming pressure of the pre-expanding particles, and thermal fusion between the expanded particles. At the contact portion, the foamed particles...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/16C08L25/06B65D85/72
Inventor 稻田修邦后藤孝至都乡成彦
Owner SEKISUI PLASTICS CO LTD