Biodegradable polyester, preparation process thereof and products comprising said polyester

A biodegradable polyester and biodegradable technology, applied in the field of biodegradable polyester, its preparation and products containing the polyester, can solve the problems of difficult separation of polyethylene, difficult recycling or treatment, etc.

Active Publication Date: 2015-03-25
NOVAMONT SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, paper laminates with polymers such as polyethylene are not easy to recycle or handle because the polyethylene can only be separated from the paper with great difficulty during the recycling process

Method used

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  • Biodegradable polyester, preparation process thereof and products comprising said polyester
  • Biodegradable polyester, preparation process thereof and products comprising said polyester
  • Biodegradable polyester, preparation process thereof and products comprising said polyester

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0107] Synthesis of polybutylene sebacate-co-butylene terephthalate (PBST), its terephthalic acid content = 56mol%, MFI = 10 (190 ° C and 2.16 kg), 180 ° C and γ = 103.7s -1 Lower shear viscosity = 620 Pas, and terminal unsaturated group content = 0.48 mol%.

[0108] Regarding the measurement of the unsaturated group content, the measurement was carried out by H1 NMR 300 MHz with a pulse-acquisition sequence characterized by a 30° pulse phase, spectral range = 4 kHz, 5 sec delay and 6000 scans. The measuring frequency range is 4.9~6.2ppm. The sample to be analyzed was obtained by preparing a solution of the polymer at a concentration of 65 mg / ml in deuterated chloroform. 270 kg of this PBST in granular form were fed together with 40 g of α,α'-bis(tert-butylperoxy)diisopropylbenzene (LuperoxF) (corresponding to 0.0148 wt % relative to PBST) under the following conditions In the twin-screw extruder:

[0109] -Extruder temperature characteristics: 30-100-200-170-150×3-160℃

...

Embodiment 2

[0125] Synthesis of polybutylene sebacate-co-butylene terephthalate (PBST) with terephthalic acid content = 56 mol%, MFI = 11.1 (190 °C and 2.16 kg), shear at 180 °C Viscosity = 580 Pas, and terminal unsaturated group content = 0.42 mol%.

[0126] 280 kg of this PBST in the form of granules was fed together with 67 g of α,α'-bis(tert-butylperoxy)diisopropylbenzene (LuperoxF) (corresponding to 0.0239 wt % relative to PBST) under the following conditions In the twin-screw extruder:

[0127] -Extruder temperature characteristics: 30-100-200×3-180-155-165℃

[0128] - Twin-screw rotation speed: 200rpm

[0129] -Head pressure: 93kg / cm 2

[0130] - Active degassing.

[0131] The shear viscosity of the obtained product at 180°C=1170Pas, thermal stability constant=0.3×10 -4 , Melt strength at 180°C = 2.6g, and elongation at break at 180°C > 50. The product thus obtained in granular form was subsequently fed into the same extrusion coating system as in Example 1.

Embodiment 3

[0133] Synthesis of polybutylene sebacate-co-butylene terephthalate (PBST) with terephthalic acid content = 56 mol%, MFI = 10.6 (190 °C and 2.16 kg), shear at 180 °C Viscosity = 590 Pas, and terminal unsaturated group content = 0.51 mol%.

[0134] 280 kg of this PBST in the form of granules was fed together with 45 g of α, α'-bis(tert-butylperoxy) diisopropylbenzene (LuperoxF) (corresponding to 0.016 wt % with respect to PBST) into a bismuth under the following conditions In the screw extruder:

[0135] -Extruder temperature characteristics: 30-100-200×3-180-155-165℃

[0136] - Twin-screw rotation speed: 210rpm

[0137] -Head pressure: 94kg / cm 2

[0138] - Active degassing.

[0139] The shear viscosity of the obtained product at 180°C=1200Pas, thermal stability constant=0.2×10 -4 , Melt strength at 180°C = 2.9g, and elongation at break at 180°C > 50.

[0140] The product thus obtained in granular form was subsequently fed into the same extrusion coating system as in Exa...

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Abstract

The invention relates to a biodegradable polyester, particularly suitable for extrusion coating, comprising units deriving from at least a diacid and at least a diol, with long chain branches (isometric with respect to the main chains of the polyester) and essentially gel-free, characterized by optimum adhesion to paper, excellent sealability and processability in extrusion coating systems. Said biodegradable polyester is obtainable through a reactive extrusion process starting from a substantially linear polyester precursor with defined viscosity and concentration of reactive sites which allow transformation of a few chains of the polyester precursor into isometric branches of this polyester. A further object of the present invention is a laminate product composed of at least a backing, preferably paper, and of at least a first layer composed of polyester according to the invention.

Description

[0001] This application is a divisional application of the Chinese patent application with application number 200980110806.3. field of invention [0002] The present invention relates to biodegradable polyesters, particularly suitable for extrusion coating, comprising units derived from at least a diacid and at least a diol, having long chain branches (isometric with respect to the polyester backbone). )) and substantially gel-free, characterized by higher melt strength, higher elongation at break, lower neck-in relative to conventional biodegradable polyesters of the same viscosity, and additionally characterized by Excellent adhesion to paper, excellent sealing and processability in extrusion coating systems. [0003] The biodegradable polyesters according to the invention are obtainable by a reactive extrusion process starting from polyester precursors comprising units derived from at least a diacid and at least a diol, which polyester precursors are substantially linear, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/91C08G63/16B32B27/10B32B27/36
CPCB32B23/08B32B23/20B32B27/08B32B27/10B32B27/18B32B27/20B32B27/22B32B27/36B32B29/005B32B2270/00B32B2307/308B32B2307/31B32B2307/412B32B2307/51B32B2307/54B32B2307/558B32B2307/7163B32B2307/7244B32B2307/7246B32B2439/00B32B2439/70C08G63/16C08G63/916Y10T428/31786Y10T428/3179
Inventor C·巴斯蒂奥利A·拉利斯
Owner NOVAMONT SPA
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