Biodegradable Aliphatic-Aromatic Copolyester
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Abstract
Biodegradable aliphatic/aromatic copolyester comprising: A) an acid component comprising repeating units of: 1) 53 to 54 mol % of an aromatic carboxylic acid; 2) 47 to 36 mol % of an aliphatic acid at least 50% of which is azelaic acid ; B) a diol component selected from the group consisting of C3, C4 and C6 diols; said AAPE being disintegrated according to the Standard ISO 20200 in 90 days.
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Citations
25 Claims
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1-11. -11. (canceled)
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2. A biodegradable aliphatic/aromatic copolyester (AAPE) comprising:
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A) an acid component comprising repeating units of; 1) 53 to 64 mol %, of an aromatic carboxylic acid; 2) 47 to 36%, of an aliphatic acid at least 50% of which is azelaic acid; B) a diol component selected from the group consisting of C3, C4 and C6 diols; said AAPE being disintegrated according to the Standard ISO 20200 in 90 days and having; a density of less than a 1.22 g/cc a number average molecular weight Mn of 40,000-140,000 an inherent viscosity of 0.8-1.5. a Elastic Modulus higher than 100 Pa. a polydispersity index determined by means of GPC of between 1.8 and 25.
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13. Biodegradable polyesters according to claim 12, characterized in that said acid component A) comprises repeating units of:
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1) 54 to 60 sol °
, of an aromatic carboxylic acid,2) 46 to 40%, of an aliphatic acid at least 50%, of which is azeliac acid.
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- 14. Biodegradable polyesters according to claim 12, characterized in that the aromatic dicarboxylic acid is a compound of the phthalic-acid type.
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16. Biodegradable polyesters according to claim 12, characterized by having a crystallization temperature Tc higher than 40°
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17. Biodegradable polyesters according to claim 12, characterized in that the dialcohol is 1,4-butandiol.
- 18. A blend comprising a polyester according to claim 12, optionally obtained by means of reactive extrusion, both with polyesters of the same type and with other biodegradable polymers whether of natural origin or of synthetic origin.
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25. Use of the polyesters according to claim 12 for the production of:
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films, whether one-directional or two-directional films, and multilayer films with other polymeric materials; films for use in the agricultural sector as mulching films; bags and sheathes for gathering organic matter; packaging for foodstuffs both single-layer and multilayer, such as for example containers for mile, yoghurt, meat, beverages; coatings obtained with the extrusion-coating technique; multilayer laminates with layers of paper, plastic materials, aluminum, metallized films; foamed for foamable beads for the production of pieces formed by sintering; foamed and semi-foamed products including foamed blocks made up of pre-foamed particles; foamed sheets, thermoformed sheets and containers obtained therefrom for the packaging of foodstuff; containers in general for fruit and vegetables; composites with gelatinized, destructured and/or complexed starch, natural starch, flours, other fillers of natural, vegetal or inorganic origin; fibres, fabrics and non-woven fabrics for the sector of health, sanitary products, and hygiene.
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Specification