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Fibers comprising polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymer blends

A technology of polyhydroxyalkanoate and copolymer, which is applied in the field of fibers including polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymerization mixture, which can solve the problem of slow crystallization speed and limited production speed of polymer products, etc. question

Inactive Publication Date: 2004-06-02
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the mechanical and melt operating conditions of these copolymers are generally improved over PHB or PHBV, their crystallization rates are characteristically slower and generally slower than those of PHB and PHBV
[0009] However, converting these newer PHA copolymers, as well as other biodegradable polymers, into useful forms, often using conventional melting methods, is quite challenging because they retain a large Viscous, and remains until sufficient crystallinity occurs, especially for PHA copolymer content above 10% by weight
Residual tack typically enables the substance to stick to itself or to processing equipment, or both, limiting the rate at which polymeric products can be produced, or preventing the product from being collected in an appropriate quality form

Method used

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  • Fibers comprising polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymer blends
  • Fibers comprising polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymer blends
  • Fibers comprising polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymer blends

Examples

Experimental program
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Effect test

Embodiment 2

[0088] This example demonstrates the melt spinnability of a binary blend comprising a preferred polyhydroxyalkanoate copolymer and PLA polymer. Specifically, a polyhydroxyalkanoate copolymer comprising 3-hydroxybutyrate and about 12 mole percent 3-hydroxyhexanoate (hereinafter referred to as PHBH copolymer) and the PLA polymer from Example 1 were combined The mixture is first melted and formulated in a twin-screw extruder, and the temperature and screw speed of the extruder ensure the sufficient mixing of the two components, wherein the content of PHBH varies from 10 to 70% by weight based on the total weight of PHBH and PLA percentage. Each formulated PHBH / PLA blend was melt spun into fibers using the procedure described in Example 1. For PHBH levels of less than about 35 weight percent, no fiber rewinding or residual stickiness was observed and fibers 20 to 25 microns in diameter were collected. Comparing the tactile properties of these PHBH / PLA fibers with those of pure P...

Embodiment 3

[0090] This example demonstrates the melt spinnability of a ternary blend comprising a preferred polyhydroxyalkanoate copolymer, a PLA polymer and a preferred moisture sensitive polymer. Specifically, a mixture of the PHBH copolymer of Example 2, the PLA polymer of Example 1, and polyethylene oxide (PEO) polymer was prepared by the melt formulation procedure in Example 2, wherein the PHA content was 20 weight percent , the PLA content is 64% by weight, and the PEO content is 16% by weight. The formulated PHBH / PLA / PEO blend was melt spun into fibers using the procedure described in Example 2, collecting fibers ranging in diameter from 14 to 25 microns. Comparing the tactile properties of these PHBH / PLA / PEO fibers with those of the PHBH / PLA blends of Example 2 with mixing ratios of 20 / 80 and 40 / 60, and those of pure PLA in Example 2, the results show that adding There was a noticeable increase in softness after a small amount of PEO was added to the PHBH / PLA blend, where the PH...

Embodiment 4

[0092] This example demonstrates the melt spinnability of bicomponent fibers using the PHA of Example 2 in the core. PLA resin from Biomer, L5000, was used as the sheath and PHA as the core at sheath / core ratios of 20 / 80, 40 / 60, 60 / 40 and 80 / 20. The fiber diameter is 20 to 35 microns. This example demonstrates that bicomponent fibers can be prepared using a high Tg polymer and PHA.

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Abstract

Environmentally degradable melt spun fibers comprising a polyhydroxyalkanoate copolymer and a polylactic acid polymer or copolymer are disclosed. A preferred configuration of the present invention is directed to environmentally degradable fibers comprising a sheath / core structure where the core comprises a biodegradable polyhydroxyalkanoate copolymer and the sheath comprises a polymer or copolymer of polylactic acid. Nonwoven webs and disposable articles comprising the environmentally degradable fibers are also disclosed.

Description

[0001] This application claims priority to US Patent Serial No. 60 / 278,948, filed March 27,2001. field of invention [0002] The present invention relates to environmentally degradable fibers comprising polyhydroxyalkanoate copolymers and polylactic acid polymers or copolymers. The fibers are used in the manufacture of disposable nonwoven articles. Background of the invention [0003] The present invention relates to the need to alleviate the growing environmental problem caused by the excess plastic waste which occupies an increasing volume fraction in landfills. Biodegradable polymers and products formed therefrom are becoming increasingly important in view of the desire to reduce the amount of solid waste generated by consumers each year. The present invention also relates to the need to develop new plastic materials that can be used in applications that primarily require properties such as biodegradability, compostability or biocompatibility. There have been many attem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/20B32B27/36C08J5/18C08L67/04C08L101/16D01F6/92D01F8/14D04H3/00D04H3/14
CPCC08J2367/04D01F6/92Y10S525/938C08L67/04B32B27/20D01F8/14B32B27/36C08J5/18Y10T428/2969Y10T428/2929Y10T442/60Y10T442/184Y10T442/641Y10T442/186B32B5/26B32B2555/02
Inventor I·诺达E·B·邦德D·H·梅利克
Owner THE PROCTER & GAMBLE COMPANY
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