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Polyhydroxyalkanoate copolymer and polylactic acid polymer compsns. for laminates and films

A polyhydroxyalkanoate, composition technology, applied in the field of laminated materials, polyhydroxyalkanoate copolymer/polylactic acid polymer or copolymer blends, can solve the problem of hindering product collection and limiting polymerization speed of product production, sticking together or sticking to processing equipment, etc.

Inactive Publication Date: 2004-05-26
THE PROCTER & GAMBLE COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Residual tack typically results in materials sticking together or on processing equipment, or both, limiting the rate at which polymer products can be produced, or preventing product collection in a suitable quality form

Method used

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  • Polyhydroxyalkanoate copolymer and polylactic acid polymer compsns. for laminates and films
  • Polyhydroxyalkanoate copolymer and polylactic acid polymer compsns. for laminates and films
  • Polyhydroxyalkanoate copolymer and polylactic acid polymer compsns. for laminates and films

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] This example shows the processing of a binary blend comprising a preferred polyhydroxyalkanoate copolymer and a PLA polymer. Specifically, a polyhydroxyalkanoate copolymer comprising 3-hydroxybutyrate and about 12 mole percent of 3-hydroxyhexanoate (hereinafter referred to as PHBH copolymer) and crystallized Blends of polylactic acid (PLA) polymers are melt processed into films. The PHBH content ranges from 10% to 70% based on the total weight of PHBH and PLA. At levels below about 35% PHBH, no observable residual stickiness occurs. Compared with pure PLA films, these PHBH / PLA films showed a significant softness improvement with the addition of low to moderate amounts of PHBH to PLA. Some residual stickiness occurs at about 40% to 65% PHBH content. Significant sticky residue occurs at PHBH levels above about 70%.

Embodiment 2

[0093] This example shows the processing of a ternary blend comprising a preferred polyhydroxyalkanoate copolymer, a PLA polymer and a preferred moisture sensitive polymer. Specifically, the blend of PHBH copolymer and PLA polymer and polyethylene oxide (PEO) polymer of Example 1 was first prepared by the melt blending step in Example 1, wherein the content of PHA by weight The PLA content is 20%, the PLA content is 64%, and the PEO content is 16%. The blended PHBH / PLA / PEO blend was melt-processed into film by web extrusion. Compared to the 20 / 80 and 40 / 60 PHBH / PLA blends of Example 1, these PHBH / PLA / PEO films showed significant softness with the addition of small amounts of PEO to the PHBH / PLA blends improvement, wherein the PHA content in the first PHBH / PLA blend was the same as that in the PHBH / PLA / PEO blend, and the PLA content in the second PHBH / PLA blend was the same as that in the PHBH / PLA / PEO blend. The content is similar.

Embodiment 3

[0095] This example shows the processing of a bilayer laminate film using the PHA copolymer of Example 1 in the first layer. PLA resin L5000 from Biomer was used in the second layer, the ratio of the first layer to the second layer was 20 / 80, 40 / 60, 60 / 40 and 80 / 20. A co-extrusion process is used to produce this bilayer laminated film.

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Abstract

Environmentally degradable films comprising a blend of polyhydroxyalkanoate copolymer and a polylactic acid polymer or copolymer are disclosed. Laminates having a first layer comprising a PHA copolymer and a second layer comprising a PLA polymer or copolymer are also disclosed. Disposable articles comprising the environmentally degradable films or laminates are also disclosed.

Description

[0001] This application claims priority to US Patent SN 60 / 278,948, filed March 27,2001. field of invention [0002] The present invention relates to environmentally degradable films comprising polyhydroxyalkanoate copolymer (PHA) / polylactic acid polymer or copolymer (PLA) blends. The present invention also discloses a laminate comprising a first layer comprising a PHA copolymer and a second layer comprising a PLA polymer or copolymer. The films or laminates are used in the manufacture of disposable articles. Background of the invention [0003] The present invention relates to the need to alleviate the growing environmental problem of excess plastic waste making up an increasing material volume fraction in landfill pits. Biodegradable polymers and products made from biodegradable polymers are becoming increasingly important based on the desire to reduce the volume of solid waste generated annually by consumers. The invention also relates to the need to develop new plastic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/20B32B27/36C08J5/18C08L67/04C08L101/16
CPCC08J2367/04C08L67/04B32B27/20B32B27/36C08J5/18B32B27/06B32B27/28B32B2307/716B32B2307/724B32B2307/726B32B2439/46B32B2439/70B32B2555/02
Inventor I·诺达E·B·邦德D·H·梅利克
Owner THE PROCTER & GAMBLE COMPANY
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