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Shapable biodegradable polymer

Through the combination of starch, water-soluble polymers, polyol plasticizers and emulsifiers, the problem of insufficient biodegradability and mechanical properties in injection molded tampon applicators is solved, achieving high-performance, low-cost biodegradable injection Preparation of shaped polymers.

Inactive Publication Date: 2007-10-24
PLANTIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, difficulties are encountered in the manufacture of starch-based polymers especially for injection molding

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A formulation was developed containing the same levels and relative proportions of starch, PVOH and stearic acid as the "control" formulation, except that it contained 23% plasticizer (by dry weight). The plasticizer system consisted of a mixture of glycerol, maltitol and sorbitol in a ratio of 3.3:1.5:1. Additionally, the formulation contained 1% polyethylene oxide to provide biocompatibility and 1.7% glyceryl monostearate as an emulsifier. As shown in Table 5, this formulation met all the mechanical properties required for a tampon applicator.

Embodiment 2

[0073] The second formulation was the same as Example 1 except for the composition of the plasticizer consisting of glycerol, maltitol and sorbitol in a ratio of 4.3:1:3.5. As shown in Table 4, a significant increase in the content of sorbitol resulted in an increase in Young's modulus.

Embodiment 3

[0075] The control formulation was not suitable for use in the tampon applicator because it failed the cytotoxicity test, which is necessary to ensure biodegradability to the level required for a Class IIA medical device. In this example, stearic acid, which plays a role in cytotoxicity, was removed and 0.6% PEO was added.

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PUM

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Abstract

A biodegradable injection mouldable polymer having the composition a) from 50 to 85% by weight of a starch and or a modified high amylose starch b) from 4 to 13% by weight of a water soluble polymer selected from polyvinylacetate, polyvinyl alcohol and copolymers of ethylene and vinylalcohol which have a melting point compatible with the molten state of the starch components c) from 10 to 35% by weight of a polyol plasticizer d) from 0.5 to 10% of a polyethylene oxide or polyethylene glycol e) from 0 to 1.5 % by weight of a C 12-22 fatty acid or salt and f) from 0.25% to 3% of a food grade emulsifier . The polymers are suitable for biodegradable, flushable tampon applicators and other medical or industrial products where flushability and bio degradability are desirable.

Description

technical field [0001] The present invention relates to the improvement of biodegradable polymer products, especially injection moldable starch polymers. Background technique [0002] There is an increasing need to expect many plastic products to be biodegradable. One product that has been the subject of attention is the tampon applicator, which should be water-flushable, water-dispersible, and biodegradable for convenience. However, difficulties are encountered in the manufacture of starch-based polymers, especially for injection moulding. The shear stress and temperature conditions required to plasticize starch and pass it through an extrusion die can adversely affect the molecular structure of starch. Foaming should be avoided for most products and is usually a concern due to the water content of the starch. US Patent Nos. 5,314,754 and 5,316,578 suggest that foaming can be avoided by degassing the melt before it exits the die. The latter patent also avoids adding wat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L3/02C08L3/04A61F13/26A61F13/15A61L15/62C08L3/12C08L3/14
CPCC08L3/02A61F13/15252Y10T428/31971C08L23/0853Y10T428/31935C08L3/06Y10T428/31855A61L15/62A61F13/15211C08L71/02A61F13/26C08K5/151C08L23/0861C08L29/04C08L3/08C08L2205/03A61F13/266C08L31/04C08K5/053C08L2666/04C08L2666/02C08L3/12A61F13/15C08L3/04
Owner PLANTIC TECH