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Multilayer film comprising biopolymers

A multi-layer film, polymer technology, applied in the direction of packaging items, special packaging items, synthetic resin layered products, etc., can solve problems such as plasticizer migration

Inactive Publication Date: 2016-04-13
富特罗股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, liquid plasticizers can be used at high levels to improve the impact resistance of PLA, however during the lifetime of the PLA blend there is migration of the plasticizer

Method used

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  • Multilayer film comprising biopolymers
  • Multilayer film comprising biopolymers
  • Multilayer film comprising biopolymers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0230] Example 1: Preparation of a multilayer film according to an embodiment of the present invention

[0231] A pre-compound comprising:

[0232] 65% by weight NatureWorks PLA4060D, which is a commercially available amorphous PLA

[0233] resin.

[0234] 30% PBAT, and

[0235] 5% black MB which is a commercial black pigment in PLA provided as a masterbatch.

[0236] This compound was used as layer A in the coextruder. Layer B is 100% PBAT. Using from BASF FBlendC1200 as PBAT. Extruder A for layer A was heated from 140°C to 220°C while extruder B for layer B was heated from 120°C to 200°C. Coextruded layers A / B (100 μm / 100 μm) were calendered between two rolls at 20-60° C. to give layer A a glossy appearance.

Embodiment 2

[0238] Adhesion of Layer B to the metal plate was evaluated using a two rubber roll calender. The adhesion properties were compared with other types of polymers. The results are shown in Table 1. Using from BASF FBlendC1200 as PBAT. As PLA, NatureWorks PLA4060D, which is a commercially available amorphous PLA resin, was used.

[0239] Adhesion was tested using the following procedure: After glue activation at 200-240°C, the glued metal was pressed onto the multilayer film under two rubber rollers and rapidly cooled in a water bath. Use a knife to create only scratches with the following cross-hatched shape # on the film layer. High-speed embossing is performed on the scratched area. Adhesion was then assessed by manually attempting to remove the film from the metal with a knife.

[0240] Table 1.

[0241]

[0242]

Embodiment 3

[0243]Example 3: Preparation of Multilayer Films According to the Invention and Comparative Examples

[0244] Different combinations of layers A and B were coextruded to confirm the level of adhesion between these two layers. The compositions and results are shown in Table 2. Using from BASF FBlendC1200 as PBAT. As PLA, NatureWorks PLA4060D, which is a commercially available amorphous PLA resin, was used.

[0245] When a mixture is used, the pre-compound is extruded on a twin screw at a temperature in the range of 140-220°C. This compound was used as layer A in the coextruder. Use the same procedure for layer B. The co-extruder was heated from 140 to 220°C, while extruder B for layer B was heated from 120 to 220°C. Coextruded layers A / B (100 μm / 100 μm) were calendered between two rolls at 20-60° C. to give layer A a glossy appearance.

[0246] Table 2. Coextrusion results.

[0247]

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Abstract

The present invention relates to a multilayer film comprising: - at least one layer A comprising poly(butylene adipate-co-terephthalate) (PBAT) and an aliphatic polyester selected from polylactic acid (PLA), polyhydroxyalkanoate, polycaprolactone, and polyesteramides; and - at least one layer B: comprising poly(butylene adipate-co-terephthalate) (PBAT), wherein said layer A comprises at least 15% by weight of poly(butylene adipate-co- terephthalate) based on the total weight of layer A and at least 60% by weight of aliphatic polyester based on the total weight of layer A; and wherein said layer B comprises from 70 to 100% by weight of poly(butylene adipate- co-terephthalate) based on the total weight of layer B. The present invention also relates to a process for preparing a multilayer film as described previously; comprising the step of co-extruding at least one layer A with at least one layer B to form said multilayer film. The present invention also relates to the use of the multilayer film previously described, and to a substrate coated therewith.

Description

technical field [0001] The present invention relates to multilayer films comprising biopolymers such as polylactic acid (PLA), their use and processes for their preparation. The invention further includes a substrate coated with said multilayer film. Background technique [0002] Film structures manufactured from petroleum-based products derived from fossil fuels are often used in flexible packaging where there is a need for their favorable barrier, sealing and picture-capability properties. The film structures can also be used to laminate substrates such as metal sheets. [0003] Usually, for coating a metal sheet with a film, a thermoplastic film is hot-pressed onto the metal sheet directly or with the interposition of an adhesive. In particular, the use of a thermoplastic film is advantageous because the resin can be easily handled with excellent handleability and the resin film has a highly uniform thickness. [0004] Membranes for such applications should satisfy mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36
CPCB32B27/36B32B2270/00B32B2307/7163B32B2333/04B32B7/12B32B15/09B32B27/08B32B2255/10B32B2255/26B32B2439/00B32B2553/00B65D65/40
Inventor T.库平
Owner 富特罗股份有限公司
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