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Polyolefine resin sparkling sheet material and productive method

A polyolefin resin and polyolefin foaming technology, applied in the field of polyolefin resin foam sheet, can solve the problems of high melt viscosity, uneven thickness of non-foamed layer, unsatisfactory surface appearance of foamed layer, etc.

Inactive Publication Date: 2002-07-17
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, further research has shown that due to its high melt viscosity, the thickness of the non-foamed layer made of polyolefin resins with long chain branches will be uneven. As a result, for thinner non-foamed layer parts, foaming The surface appearance of the layer is unsatisfactory
Especially, when a relatively thin non-foamed layer is formed, this tendency is very obvious, and the surface smoothness of the polyolefin resin foamed sheet will be damaged.

Method used

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  • Polyolefine resin sparkling sheet material and productive method
  • Polyolefine resin sparkling sheet material and productive method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0097] Non-foamed layer / foamed layer / non-foamed layer polyolefin resin foamed sheets having two-type and three-layer structures were prepared as follows. (Constituent material of the foam layer)

[0098] As a constituent material of the foamed layer, a mixture prepared by blending polypropylene and polyethylene obtained by a two-step polymerization method in a weight ratio of 70 / 30 was used. The method of producing this propylene, the method of pelletizing it, and the mixing method of the foamed layer constituent materials will be described below. (1) Synthesis of solid catalyst

[0099]A 200L stainless steel reactor equipped with a stirrer was purged with nitrogen, and then 80L of hexane, 6.55mol of tetrabutoxytitanium, 2.8mol of diisobutyl phthalate and 98.9mol of tetraethoxy silane to obtain a homogeneous solution. Then, while keeping the temperature of the reactor at 5° C., 51 L of a solution of butylmagnesium chloride in diisobutyl ether was gradually added dropwise ov...

Embodiment 2

[0110] Sheets were produced in the same manner as in Example 1 except that the following resin mixture was used as a constituent material of the non-foamed layer, and its physical properties were evaluated. The results are listed in Table 1. The non-foamed layer of the resulting foamed sheet contained 48% by weight of recycled polyolefin resin. (Constituent material of non-foaming layer)

[0111] A foam layer having the same composition as that of the foam layer of the foam sheet produced in Example 1, and a non-foam layer made of polypropylene having long chain branches (Polypropylene PF814, produced by Montel) were used. On both sides of the constituent resin of the thermally plasticized foam layer, laminate the constituent resin of the thermally plasticized non-foam layer, and co-extrude from a die head controlled at 210°C, while the above foam layer The constituent resin was foamed to obtain a sheet. Along the inner mold core that has been cooled by 6°C circulating wate...

Embodiment 3

[0113] Use the resin (A) and resin (B) described below as the constituent materials of the non-foamed layer, and prepare three types of five-layer polyolefin-based resin foamed sheets by the co-extrusion foaming method according to the following method, the sheet The composition of the material is non-foamed layer of resin (A) / non-foamed layer of resin (B) / foamed layer / non-foamed layer of resin (B) / non-foamed layer of resin (A), and to The physical properties of the sheets were evaluated. The results are listed in Table 1. (Constituent material of non-foaming layer) Resin (A)

[0114] With a co-rotating twin-screw extruder (trade name: PCM45; manufactured by Ikegai K.K.), at a screw speed of 200 rpm, polypropylene pellets having long chain branches (trade name: Polypropylene PF814, manufactured by Montel) were melt-kneaded , extruded at a die head temperature of 240°C to obtain strands, cooled in water and solidified, and then cut with a cutting machine to obtain resin pelle...

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Abstract

A sheet excellent in surface smoothness in which bubble break in a foamed layer is effectively prevented, and a method of producing this sheet stably are provided. There are provided a polyolefin resin foamed sheet comprising a polyolefin foamed layer, and a polyolefin resin non-foamed layer containing 10% by weight or more of a recycled polyolefin subjected to at least two cycles of a process comprising melting and solidifying polyolefin selected from the group consisting of polyolefin having long chain branched and polyolefin having a weight-average molecular weight of 1x105 or more, and a method of producing a polyolefin resin foamed sheet comprising a polyolefin resin foamed layer and a polyolefin resin non-foamed layer wherein a polyolefin layer 1 containing a foaming agent and a polyolefin layer 2 containing 10% by weight or more of a recycled polyolefin subjected to at least two cycles of a process comprising melting and solidifying polyolefin selected from the group consisting of polyolefin having long chain branch and polyolefin having a weight-average molecular weight of 1 x105 or more are co-extruded, and the polyolefin resin layer 1 is foamed.

Description

field of invention [0001] The invention relates to a polyolefin resin foam sheet with good surface smoothness and a production method thereof. Background of the invention [0002] Polyolefin resin foamed sheets obtained by laminating a polyolefin resin non-foamed layer on at least one surface of a polyolefin resin foamed layer are known, and they are used as building and earth moving materials, packaging containers and the like. However, in the process of producing such a sheet, a phenomenon of cell collapse, called cell breakage, often occurs in the polyolefin resin foamed layer, and as a result, the obtained polyolefin resin foamed sheet has Surface smoothness is poor. [0003] In order to solve this problem, the present inventors have conducted intensive studies and have found that surface smoothness can be obtained by laminating a layer made of a polyolefin resin having long chain branches on a polyolefin resin foamed layer. Excellent polyolefin resin foam sheet. [0...

Claims

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Application Information

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IPC IPC(8): B29C44/24B29C44/22B29C48/07B29C48/09B32B5/18B32B27/32C08L23/10
CPCB32B27/32Y10T428/249987B29C47/0023B32B5/18B29C44/22C08J2400/30Y10T428/249953B29C47/065B29C47/266C08L23/10C08L2205/02B29C48/09B29C48/21B29C48/337B29C48/07C08L2666/04B29C44/24
Inventor 花田晓黑田龙磨
Owner SUMITOMO CHEM CO LTD
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