Compound comprising PLLA and PDLA

A composition and polymer technology, applied in the field of compositions containing PLLA and PDLA, can solve the problems that PLA is slow and cannot be applied on an industrial scale

Active Publication Date: 2014-06-25
PURAC BIOCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that, even if these conditions are met, the crystallization of PLA tends to proceed very slowly, with the result that it cannot be applied on an industrial scale

Method used

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  • Compound comprising PLLA and PDLA
  • Compound comprising PLLA and PDLA
  • Compound comprising PLLA and PDLA

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1 (prior art)

[0045] It is known from the literature that adding a nucleating agent to PLA is a method to rapidly crystallize PLA at high temperature and obtain a higher deformation temperature. In this example, make Ingeo TM (Natureworks) mixed with two nucleating agents (ULTRATALC609 and LAK-301) to increase the crystallization rate.

[0046] Table 1 presents the results obtained by Natureworks for the compositions HHIM and 3801X. Table 1 shows the components, and the amount of each component is expressed in weight percent (wt %) relative to the total weight of the composition.

[0047] As expected, higher crystallization rates (HDT-B values) were obtained after crystallization, but the crystallization rates were found to be still too low, resulting in longer cycle times (greater than 150 seconds). For this reason, these formulations are not yet suitable for industrial use for injection molding or thermoforming.

[0048] Table 1Ingeo TM HHIM&3801X ...

Embodiment 2

[0051] Example 2 shows that PDLA with an optical purity of 99.5% can be used as a nucleating agent for PLA. As in the previous examples, higher HDT-B values ​​were obtained after crystallization. Additionally, an increase in tensile strength was observed when PDLA having an optical purity of at least 99.5% was present. Especially in the case of samples 3-6, relative to the composition of example 1, a significant increase in tensile strength and elongation at break was observed.

[0052] Table 2Ingeo TM 6201D&PDLA (*comparative example)

[0053]

Embodiment 3

[0055] The following examples show that PDLA can also increase the crystallization rate of PLLA. When PLLA is optically pure, the crystallization rate in combination with PDLA is significantly higher than in the previous examples. Better HDT-B values ​​are obtained after crystallization. And again better mechanical properties were observed.

[0056] Table 3 PLLA & PDLA

[0057]

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Abstract

The present invention relates to a composition comprising a poly-D- lactic acid (PDLA) polymer and a poly-L-lactic acid (PLLA) polymer. The present invention also relates to a method for the production of a moulded part comprising the steps of heating a mould, and supplying to the mould a composition comprising a poly-D-lactic acid (PDLA) polymer and a poly-L-lactic acid (PDLA) polymer. The present invention relates to a composition comprising a poly-D-lactic acid (PDLA) polymer and a poly-L-lactic acid (PLLA) polymer for use in injection-moulding, thermoforming and / or film blowing. The present invention also relates to a composition that can be obtained by heating a composition comprising a poly-D- lactic acid (PDLA) polymer and a poly-L-lactic acid (PDLA) polymer.

Description

technical field [0001] The present invention relates to compositions comprising poly-D-lactic acid (PDLA) polymers and poly-L-lactic acid (PLLA) polymers. The invention also relates to a method of producing a molded part, said method comprising the steps of heating a mold and supplying a composition comprising a poly-D-lactic acid (PDLA) polymer and a poly-L-lactic acid (PDLA) polymer to the mold . The present invention relates to compositions comprising poly-D-lactic acid (PDLA) polymers and poly-L-lactic acid (PLLA) polymers for injection molding, thermoforming and / or blown film. The invention also relates to a composition obtainable by heating a composition comprising a poly-D-lactic acid (PDLA) polymer and a poly-L-lactic acid (PDLA) polymer. Background technique [0002] Polylactic acid (PLA) is a collective term for lactic acid monomer-based polymers whose structure varies from completely amorphous through semi-crystalline to crystalline, depending on its composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08L67/04
CPCC08L67/04
Inventor J·努德格拉夫J·P·M·德容
Owner PURAC BIOCHEM
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