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Homopolymer or homopolymer membrane based on lactic acid unit

A polylactic acid, base layer technology, applied in the field of preparing the film, can solve the problems of increased friction coefficient, increased surface resistance, poor antistatic performance, etc.

Inactive Publication Date: 2010-05-05
TREOFAN GERMANY GBMH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Some combinations have been shown to have even worse antistatic properties than either the particles or the additives alone
It is speculated that particulate additions in the PLA matrix affect the migration behavior of said additives, for example, certain types of microparticles have been shown to absorb said additives so that they are retained almost ineffectively in the polymer matrix
For example, it has surprisingly been found that the use of silica microparticles in combination with glycerol monostearate as a migratable antistatic agent leads to an increase in the surface resistance and to an elevated coefficient of friction

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A transparent three-layer PLA film with a thickness of about 30 μm was prepared by extrusion and subsequent lateral and longitudinal orientation stepwise. The base layer contains almost 100% by weight of polylactic acid whose melting point is about 160°C. This layer additionally contains stabilizers and neutralizers in usual amounts. The thickness of the covering layer is about 2.5 μm, and besides PLA, it also contains 2% by weight of GMS and 0.15% by weight of muscovite as additives. The production conditions in a single method step are:

[0056] Extrusion: Temperature: 170-200℃

[0057] The temperature of the take-off roller: 60℃

[0058] Longitudinal stretch: temperature: 68℃

[0059] Longitudinal stretch ratio: 2.0

[0060] Transverse stretch: temperature: 88℃

[0061] Transverse stretch ratio (effective): 5.5

[0062] Fixation temperature: 75℃

[0063] Convergence: 5%

[0064] In this way, a transparent film was obtained, the character...

Embodiment 2

[0066] A three-layer film was prepared as described in Example 1. Keep the GMS content. The difference from Example 1 is that calcium silicate (wollastonite) is used as anti-blocking particles. In addition, the amount of calcium silicate is again 0.15% by weight. A transparent film is also obtained with a gloss of 125 (20°) and a reduced specific surface resistance of about 6×10 12 Ω / m 2 , And improved sliding friction coefficient (COF=0.25).

Embodiment 3

[0068] A three-layer film was prepared as described in Example 1, but with a lower content of GMS of 1.5% by weight. Muscovite at a concentration of 0.15% by weight was used as anti-blocking particles. A transparent film was obtained with a gloss of 130 (20°) and has low turbidity. The film has a reduced specific surface resistance of about 8×10 12 Ω / m 2 , And a good enough sliding friction coefficient is 0.35.

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Abstract

The invention relates to a multi-layer biaxially oriented film comprising a base layer and at least one covering layer. Said covering layer comprises at least one polymer of at least one hydroxycarboxylic acid, and contains between 2 and 10 wt. % of a glycerine fatty acid ester and up to 0.5 wt. % of mica.

Description

Technical field [0001] The present invention relates to a biaxially oriented film comprising at least one layer comprising at least one polymer, glycerin fatty acid ester and inorganic anti-blocking particles, the polymer being formed from at least one aliphatic hydroxycarboxylic acid. In addition, the present invention also relates to a method for preparing the film and the use of the film. Background technique [0002] Films made of thermoplastics are widely used for packaging food and other items to be packaged. For these applications, it is necessary that the film has good antistatic properties and sliding friction properties. [0003] Recent developments in the packaging field involve films made from biodegradable polyesters, such as polylactic acid (PLA). Such membranes are considered particularly environmentally compatible because they are based on renewable raw materials and can be processed by composting. However, these materials are fundamentally different from olefin ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/36B65D65/46
CPCY10S428/913B32B27/36Y10T428/1345Y10T428/1334Y10T428/24942Y10T428/31786B32B2439/70B32B2307/41B32B27/08B32B27/205B32B2307/746B32B2367/00B32B2307/518B32B2307/412
Inventor H·德特勒夫
Owner TREOFAN GERMANY GBMH & CO KG