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Multilayer film structure

A multi-layer film and single-layer film technology, applied in the direction of layered products, synthetic resin layered products, applications, etc., can solve the problems of reducing mechanical strength, disadvantages, reducing light transmittance in PAR, etc., and achieve high scattering effect , the effect of high turbidity performance

Active Publication Date: 2010-03-10
BOREALIS TECH OY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this disadvantageously reduces the transmittance of light in the PAR, and at the same time, also reduces the mechanical strength of the film

Method used

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  • Multilayer film structure

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Embodiment

[0207] polymer material

[0208] LLDPE1: The multimodal znLLDPE polymers used in the films of the present examples were prepared as follows: The multimodal znLLDPE polymers were prepared in a pilot scale multi-stage reactor system including a loop reactor and a gas phase reactor. The prepolymerization step is carried out before the actual polymerization step. Pre-polymerization stage at 50dm 3 The prepolymerization catalyst prepared according to Example 1 of WO 2004 / 000902 and the triethylaluminum cocatalyst were carried out in slurry at about 80° C. and a pressure of about 65 bar in a loop reactor of WO 2004 / 000902. The molar ratio of cocatalyst aluminum to catalyst titanium was about 20. Ethylene was fed at a ratio of (200 g C2 / 1 g catalyst). Propane was used as a diluent and hydrogen was fed in an amount to adjust the MFR2 of the prepolymer to about 10 g / 10 min. Transfer the prepolymerized catalyst and triethylaluminum cocatalyst together with the resulting slurry to th...

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Abstract

The present invention relates to a multilayer film structure suitable for agricultural use, which may be prepared by co-extrusion or lamination processes.

Description

technical field [0001] The present invention relates to a multilayer film structure suitable for agricultural applications, which can be produced by coextrusion or lamination. Background technique [0002] To increase plant yields, plastic films are widely used in agriculture. Usually, vinyl polymer films are used for this purpose, especially in greenhouses, tunnels and mulch cultivation. Known typical examples of ethylene polymers used in such applications are LDPE (low density polyethylene) films and EVA (ethylene vinyl acetate) films. These materials are generally used in the form of monolayer films of varying thickness, typically 100-250 [mu]m. The requirements for such membranes are numerous and not all types of membranes fulfill the requirements in terms of all required properties. The general requirements for agricultural film are as follows: [0003] 1. They should have strength and rigidity so that they can be used without risk of breakage, and at the same time,...

Claims

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Application Information

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IPC IPC(8): B32B27/32C08J5/18
CPCB32B27/322B32B27/32A01G9/1438Y02A40/25
Inventor 本特·哈格斯特伦彼得·马尔姆罗斯
Owner BOREALIS TECH OY