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Co-injection-molded multilayer structure

一种多层结构体、共注射的技术，应用在合成树脂层状产品、分层产品、包装物品类型等方向，能够解决EVOH层与疏水性树脂层粘接性差、制造成本上升等问题，达到层间粘接性优异、优异粘接性的效果

Active Publication Date: 2019-07-26
KURARAY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adhesion between the EVOH layer and the hydrophobic resin layer is poor, and an adhesive resin layer such as maleic anhydride-modified polyolefin is widely used between the two layers.
However, if the layer configuration becomes complicated, an increase in production cost cannot be avoided, and a method of bonding without providing an adhesive resin layer is sought.

Method used

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  • Co-injection-molded multilayer structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0126] For an ethylene content rate of 32 mol%, saponification degree of 99 mol% or more, MFR of 4.4g / 10min (190°C, 2160g load), OTR of 2.0cc・20μm / m 2 ・Day・atm (20℃ / 85%RH) EVOH resin (Curare Co., Ltd. エバール F104B) (called "EVOH1") mixed with 1500ppm of potassium stearate (based on 182 ppm in terms of metal atoms), melt-kneading, pelletization, and drying were performed under the following conditions to obtain pellets of the EVOH resin composition. Potassium stearate has a melting point of 240°C.

[0127] ・Equipment: 26mmφ twin-screw extruder (by Toyo Seiki Seisakusho, ラボプラストミル15C300)

[0128] ・L / D: 25

[0129] ・Screw: Full engagement in the same direction

[0130] ・Number of die holes: 2 holes (3mmφ)

[0131] ・Extrusion temperature (°C): C1=200, C2~C5=240, Die=240

[0132] ・Rotation speed: 100rpm

[0133] ・Discharge amount: about 5kg / hr

[0134]・Drying: hot air drying 80℃ / 6hr

[0135] Using the obtained pellets of the EVOH resin composition, a film was formed under the ...

Embodiment 2

[0162] Instead of EVOH1, use an ethylene content of 35 mol%, a saponification degree of 99 mol% or more, an MFR of 9.3g / 10min (190°C, 2160g load), and an OTR of 2.6cc・20μm / m 2 ・Day・atm (20°C / 85%RH) EVOH resin (Eval C109B manufactured by Kurare Co., Ltd.) (called "EVOH2") was obtained by the same method as in Example 1. EVOH resin composition, Hybrid polypropylene pellets, monolayer films and co-injection molded multilayer structures. The obtained single-layer film and co-injection molded multilayer structure were evaluated in the same manner as in Example 1, and the results are shown in Table 1.

Embodiment 3

[0164] An EVOH resin composition was obtained by the same method as in Example 1 except that MOPLEN RP398T (MFR=40g / 10min (230°C, 2160g load)) manufactured by Lyondell Basell was used as the polypropylene (E). , mixed polypropylene pellets, monolayer films and co-injection molded multilayer structures. The obtained single-layer film and co-injection molded multilayer structure were evaluated in the same manner as in Example 1, and the results are shown in Table 1.

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Abstract

Provided is a co-injection-molded multilayer structure having a barrier layer and outer layers layered in contact therewith on both sides thereof, wherein the barrier layer comprises a resin composition including an ethylene-vinyl alcohol copolymer (A) and an alkali metal salt (B) of a higher fatty acid having a melting point of 250 DEG C or lower, the content of the alkali metal salt (B) in the barrier layer is 50-1500 ppm, and the outer layers comprise a resin composition including an unmodified polypropylene (E) and an anhydrous maleic-acid-modified polypropylene (F) having a lower melt viscosity than the unmodified polypropylene (E). The co-injection-molded multilayer structure has excellent adhesion of the barrier layer comprising an EVOH resin composition and the outer layers comprising a polypropylene resin composition, despite not having an adhesive layer.

Description

technical field [0001] The present invention relates to a co-injection molded multilayer structure having a barrier layer formed of an ethylene-vinyl alcohol copolymer resin composition and contact laminated outer layers on both sides thereof. In addition, it relates to the ethylene-vinyl alcohol copolymer resin composition used therein. Background technique [0002] Ethylene-vinyl alcohol copolymer (hereinafter sometimes referred to as EVOH) is a polymer material with excellent barrier properties to gases such as oxygen and organic chemicals, and is widely used as various packaging materials such as films, sheets, and containers. [0003] EVOH is a resin that easily absorbs moisture, and its barrier performance decreases due to moisture absorption. Therefore, when EVOH is used for containers and the like, it is often used as a multilayer structure in which hydrophobic resin layers such as polyolefin layers are arranged on both sides of the EVOH layer in order to prevent mo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/28B29C45/16B29K23/00B29K29/00B29L9/00B32B1/00
CPCB29C45/16B32B27/28B32B2270/00B32B2250/03B32B2250/24B32B2250/40B32B2439/70B32B2264/02B32B2264/105B32B2307/7242B32B2307/7244B32B27/08B32B27/306B32B27/18B32B27/32B29K2023/086B29K2023/12B29K2995/0067B29L2031/712B65D65/40B32B1/00
Inventor E.周G.梅德洛克广濑航
Owner KURARAY CO LTD
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