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Method for preparing thermoplastic compositions based on plasticized starch and resulting compositions

A thermoplastic composition, the technology of the composition, applied in the field of preparing starch-based thermoplastic composition, can solve the problems of limited use and the like

Inactive Publication Date: 2010-12-29
ROQUETTE FRERES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, its use is very limited

Method used

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  • Method for preparing thermoplastic compositions based on plasticized starch and resulting compositions
  • Method for preparing thermoplastic compositions based on plasticized starch and resulting compositions
  • Method for preparing thermoplastic compositions based on plasticized starch and resulting compositions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0137] Compositions based on wheat starch according to the invention compared with compositions prepared without coupling agents according to the prior art

[0138] The ones used for this instance are:

[0139] - a native wheat starch sold by the applicant under the name "Amidon de blé SP" [Wheat Starch SP], with a moisture content of about 12% (component 1);

[0140] - a concentrated aqueous composition of glycerol-based and sorbitol-based polyols sold by the applicant under the name POLYSORB G84 / 41 / 00, having a water content of about 16% (component 2); and

[0141] - Methylene diphenyl diisocyanate (MDI) sold under the name Suprasec 1400 by Huntsman (component 3).

[0142] (a) Preparation of base thermoplastic (TPS) composition:

[0143] First, a thermoplastic composition according to the prior art is prepared. To this end, the starch and plasticizer were fed to a TSA brand twin-screw extruder with a diameter (D) of 26 mm and a length of 56 D to give a total material thro...

Embodiment 2

[0181] Addition of a functional substance

[0182]For the purpose of further increasing the water stability of the base thermoplastic starch mixture AP6040 obtained according to Example 1, MDI and a polyethylene grafted with 2% vinyltrimethoxysilane (PEgSi) were carried out with this composition. Mix to form a dry blend. The PegSi used was previously obtained by grafting vinyltrimethoxysilane onto a low-density PE by extrusion. As an example of such a commercially available PEgSi, mention may be made of the products BorPEX ME2510 or BorPEX HE2515, both sold by Boréalis.

[0183] This dry blend was fed into the previously described twin screw extruder.

[0184] The extrusion conditions are as follows:

[0185] - temperature profile (10 heating zones Z1 to Z10): 150 °C;

[0186] - Screw speed: 400 rpm.

[0187] The following compositions were prepared by introducing different amounts of MDI: 2 and 4 parts per hundred parts of thermoplastic composition AP60400 (phr).

[018...

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Abstract

The subject matter of the present invention is a method for preparing a starch-based thermoplastic composition, comprising the following steps: (a) selecting at least one granular starch and at least one organic plasticizer for this starch, (b) preparing a plasticized composition by thermomechanically mixing this starch and this plasticizer, (c) optionally incorporating at least one functional substance carrying functions comprising an active hydrogen, (d) incorporating at least one bonding agent carrying at least two functional groups capable of reacting with molecules carrying functions comprising an active hydrogen, and optionally (e) heating the mixture to a temperature sufficient to cause the bonding agent to react with the plasticizer and with the starch and / or the functional substance, it being possible for steps (d) and (e) to be carried out simultaneously, and also a starch-based thermoplastic composition that can be obtained by means of this method.

Description

technical field [0001] The present invention relates to a new process for the preparation of starch-based thermoplastic compositions and to the compositions thus obtained. Background technique [0002] The expression “thermoplastic composition” is understood in the context of the present invention to mean a composition which reversibly softens under the action of heat and hardens by cooling. It has at least one glass transition temperature (T g ), below which temperature the amorphous portion of the composition is in a brittle glassy state, and above which the composition may undergo reversible plastic deformation. The glass transition temperature or at least one glass transition temperature of the starch-based thermoplastic composition of the invention is preferably between -50°C and 150°C. The starch-based composition can of course be formed by methods customary in plastics processing (extrusion, injection molding, moulding, blow molding, calendering, etc.). Its viscosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L51/06C08G18/64C08G18/32
CPCC08L75/04C08G18/6517C08K5/29C08G18/3206C08L3/02C08G2230/00C08L51/06C08G18/0895C08G18/6484C08K5/053C08L2666/24C08L2666/26C08L2666/06C08L2666/20C08G18/32C08G18/64
Inventor 莱昂·曼蒂克迪迪埃·拉尼奥热罗姆·吉梅内斯
Owner ROQUETTE FRERES SA
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