EP3227352A1 - Polyester biodégradable - Google Patents

Polyester biodégradable

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Publication number
EP3227352A1
EP3227352A1 EP15801468.8A EP15801468A EP3227352A1 EP 3227352 A1 EP3227352 A1 EP 3227352A1 EP 15801468 A EP15801468 A EP 15801468A EP 3227352 A1 EP3227352 A1 EP 3227352A1
Authority
EP
European Patent Office
Prior art keywords
acid
copolyester
mol
aliphatic
biodegradable
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP15801468.8A
Other languages
German (de)
English (en)
Inventor
Kian Molawi
Robert Loos
Andreas Kuenkel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF SE
Original Assignee
BASF SE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BASF SE filed Critical BASF SE
Publication of EP3227352A1 publication Critical patent/EP3227352A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
    • C08G18/428—Lactides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
    • C08G18/4266—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones
    • C08G18/4286—Polycondensates having carboxylic or carbonic ester groups in the main chain prepared from hydroxycarboxylic acids and/or lactones prepared from a combination of hydroxycarboxylic acids and/or lactones with polycarboxylic acids or ester forming derivatives thereof and polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/73—Polyisocyanates or polyisothiocyanates acyclic
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/06—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from hydroxycarboxylic acids
    • C08G63/08—Lactones or lactides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/16—Dicarboxylic acids and dihydroxy compounds
    • C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
    • C08G63/181—Acids containing aromatic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
    • C08G63/60—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from the reaction of a mixture of hydroxy carboxylic acids, polycarboxylic acids and polyhydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/78—Preparation processes
    • C08G63/80—Solid-state polycondensation
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/91—Polymers modified by chemical after-treatment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
    • C08G63/91—Polymers modified by chemical after-treatment
    • C08G63/914—Polymers modified by chemical after-treatment derived from polycarboxylic acids and polyhydroxy compounds
    • C08G63/916—Dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to biodegradable copolyesters having a molecular weight Mn measured by GPC of 10,000 to 100,000, obtainable by reaction of
  • polyester triblock having a molecular weight Mn measured by 1 H-NMR from 5,800 to 49,500 with iii) 0.1 to 3 wt .-%, based on the copolyester, of a diisocyanate.
  • the present invention relates to a process for the preparation and the use of the abovementioned biodegradable copolyesters.
  • Branched block copolyesters are known, for example, from US 5,202,413, which are prepared as follows: More than 50% by weight of a lactide is polymerized onto an aliphatic polyester or a low molecular weight aliphatic polyglycol (Mn less than 4,000). In order to increase the molecular weight of the resulting block polymer, chain extension is optionally carried out with a polyfunctional isocyanate.
  • a similar structure is found in the block copolymers described in EP 697427, which have a lactide-based content of 50 to 98% by weight and a polyester content of 2 to 50% by weight.
  • EP 618250 describes linear polyester triblocks having a molecular weight (Mn) of greater than 30,000 and at the same time a very high proportion of PLA.
  • Mn molecular weight
  • Examples 25 and 26 which assume a lower lactide content, practically no molecular weight increase is achieved. Chain extension of the formed polyester triblocks is not described.
  • the aforementioned branched or linear block copolyesters are described as film materials for the packaging sector. Especially with packaging films, the combination of highest possible elongation at break (£ B) and high breaking stress (OB) is crucial. Especially here the copolyesters with a high PLA content mentioned in the prior art do not show satisfactory results.
  • biodegradable copolyesters which are markedly improved in terms of breaking stress in thin films. Accordingly, the abovementioned biodegradable copolyesters having a molecular weight Mn measured by GPC of 10,000 to 100,000, which are obtainable by i) 51 to 84 wt .-%, based on the copolyester, of a branched polyester middle block based on aliphatic or aliphatic and aromatic dicarboxylic acids and aliphatic dihydroxy compounds having a molecular weight Mn measured by 1 H-NMR of 5,000 to 25,000, with ii) 15.9 to 48.9 wt .-%, based on the copolyester, of a lactide
  • polyester triblock having a molecular weight Mn measured by 1 H-NMR from 5,800 to 49,500 with iii) 0.1 to 3 wt .-%, based on the copolyester, of a diisocyanate.
  • the soft polyester middle block i is synthesized based on aliphatic and aromatic dicarboxylic acids and aliphatic dihydroxy compound, so-called aliphatic-aromatic polyester or based on aliphatic polyesters of aliphatic dicarboxylic acids and aliphatic diols. Common to these polyester middle blocks that they are biodegradable according to DIN EN 13432. Of course, mixtures of several such polyester middle blocks i are suitable.
  • polyester middle blocks i having a molecular weight Mn measured by 1 H-NMR of 5,000 to 25,000, which are constructed as follows:
  • an alcohol component b1) 98 to 99.99 mol%, based on the alcohol component B, of at least one C 2 -C 12 -alkanediol or mixtures thereof; and b2) from 0.01 to 2 mol%, based on the alcohol component B, of a polyol selected from the group consisting of trimethylolpropane, trimethylolethane, pentaerythritol, polyether triol and glycerol.
  • Suitable aliphatic-aromatic polyesters include non-chain extended polyesters as described, for example, in WO 92/09654.
  • the particularly preferred aliphatic-aromatic polyester middle blocks i include polyesters which, as essential components:
  • aliphatic acids and the corresponding derivatives a1 are generally those having 2 to 18 carbon atoms, preferably 4 to 10 carbon atoms, into consideration. They can be both linear and branched. In principle, however, it is also possible to use dicarboxylic acids having a larger number of carbon atoms, for example having up to 30 carbon atoms.
  • Examples include: oxalic acid, malonic acid, succinic acid, glutaric acid, 2-methylglutaric acid, 3-methylglutaric acid, ⁇ -ketoglutaric acid, adipic acid, pimelic acid, azelic acid ainklare, sebacic acid, brassylic acid, fumaric acid, 2,2-dimethylglutaric acid, suberic acid (suberic acid), diglycolic acid, oxaloacetic acid, glutamic acid, aspartic acid, itaconic acid and maleic acid.
  • the dicarboxylic acids or their ester-forming derivatives may be used singly or as a mixture of two or more thereof.
  • Succinic acid, adipic acid, azelaic acid, sebacic acid, brassylic acid or their respective ester-forming derivatives or mixtures thereof are preferably used.
  • Succinic acid, adipic acid or sebacic acid or their respective ester-forming derivatives or mixtures thereof are particularly preferably used.
  • Succinic acid, azelaic acid, sebacic acid and brassylic acid also have the advantage that they are accessible from renewable raw materials.
  • polyester middle blocks polybutylene adipate terephthalate (PBAT), polybutylene sebacate terephthalate (PBSeT) or polybutylene succinate terephthalate (PBST).
  • PBAT polybutylene adipate terephthalate
  • PBSeT polybutylene sebacate terephthalate
  • PBST polybutylene succinate terephthalate
  • aromatic dicarboxylic acid terephthalic acid or furan-2,5-dicarboxylic acid or its ester-forming derivatives such as dimethyl terephthalate or furan-2,5-dicarboxylic acid dimethyl ester is usually used.
  • the diols B are selected from branched or linear alkanediols having 2 to 12 carbon atoms, preferably 4 to 6 carbon atoms, or cycloalkanediols having 5 to 10 carbon atoms.
  • suitable alkanediols are ethylene glycol, 1, 2-propanediol, 1, 3-propanediol, 1, 2
  • 1, 4-butanediol and 1, 3-propanediol are particularly preferred.
  • 1, 4-butanediol and 1, 3-propanediol also have the advantage that they are accessible from renewable raw materials. It is also possible to use mixtures of different alkanediols. In general, 0 to 2 mol%, preferably 0.01 to 2 mol% and particularly preferably 0.1 to 1 mol%, based on the diol component B, of a branching agent b2 of an at least trifunctional alcohol used.
  • the polyester middle blocks i generally have a number average molecular weight (Mn) in the range from 5000 to 25,000, in particular in the range from 10,000 to 25,000 g / mol, preferably in the range from 12,000 to 20,000 g / mol, a weight average molecular weight (Mw) from 10000 to 75,000, preferably 20,000 to 50,000 g / mol and a Mw / Mn ratio of 1 to 6, preferably 2 to 4.
  • Mn number average molecular weight
  • Mw weight average molecular weight
  • Aliphatic polyester middle blocks i are composed of aliphatic diols and aliphatic dicarboxylic acids Polybutylene succinate (PBS), polybutylene adipate (PBA), polybutylene succinate adipate (PBSA), polybutylene succinate sebacate (PBSSe), polybutylene sebacate (PBSe), etc.
  • PBS polybutylene succinate
  • PBA polybutylene adipate
  • PBSA polybutylene succinate adipate
  • PBSSe polybutylene succinate sebacate
  • PBSe polybutylene sebacate
  • the aliphatic polyester middle blocks i preferably contain 0.01 to 2 mol% and particularly preferably 0 , 1 to 1 mol%, based on the alcohol component B, of a branching agent b2, in particular of a polyol selected from the group consisting of: trimethylolpropane, trimethylolethane, pentaerythritol, polyether triol and especially glycerol
  • the aliphatic polyester middle blocks i generally have a number average molecular weight (Mn) in the range of 5,000 to 25,000, in particular in the range of 10,000 to 25,000 g / mol, be preferably in the range of 12,000 to 20,000 g / mol, a weight-average molecular weight (Mw) of 10,000 to 75,000, preferably 20,000 to 50,000 g / mol, and a Mw / Mn ratio of 1 to 6, preferably 2 to 4.
  • the viscosity number is between 50 and 180, preferably from 80 to 120 g / m
  • the polyester middle block i can be isolated for analytical purposes. It generally has a molecular weight Mn determined by the 1 H-NMR method of 5000 to 25,000, preferably 10,000 to 25,000 and particularly preferably from 12,000 to 20,000. The method for determining the molecular weight (Mn) by means of 1 H-NMR is described in detail in the chapter on application-specific measurements.
  • the polyester middle block i has a high content of hydroxyl end groups.
  • the catalyst for example dissolved in a solvent.
  • the catalyst used is preferably tin dioctanate.
  • lactide is added to the above mixture.
  • the lactide in a concentration of 15.9 to 48.9 wt .-%, preferably 20 to 40 wt .-%, based on the total weight of the copolyester iii, is used. This corresponds to a weight ratio of lactide to middle block i of 0.19 to 0.96, preferably 0.25 to 0.67.
  • L-lactide is used in greater than 80%, preferably greater than 90%, based on the total amount of lactide.
  • the triblock polymer ii generally has a molecular weight Mn measured by 1 H-NMR of 5,800 to 49,500, preferably 12,000 to 49,500 and particularly preferably from 18,000 to 40,000.
  • the biodegradable copolyesters according to the invention can preferably be prepared as follows in a continuous process: i-1) a mixture of the aliphatic Dyhydroxyitatien, the aliphatic and aromatic dicarboxylic acids, optionally without adding a catalyst, are mixed to form a paste or alternatively the liquid esters of dicarboxylic acids and the dihydroxy compound and optionally further comonomers, optionally without addition of a catalyst, are fed, in a first stage, this mixture is continuously esterified or transesterified together with optionally the total amount or a partial amount of the catalyst;
  • Esterification product is precondensed to a viscosity number according to DIN 53728 of 20 to 70 cm 3 / g;
  • the product obtainable from i-2) is continuously polycondensed to a viscosity number according to DIN 53728 of 30 to 180 cm 3 / g, the middle blocks having a ratio of hydroxyl number to (hydroxy number + acid number) of more than 85%, preferably more than 90% and most preferably more than 95%.
  • the polyester triblock obtainable from ii) in a polyaddition reaction with 0.1 to 3 wt .-%, based on the copolyester, of a diisocyanate to a viscosity number according to DIN 53728 of 100 to 320 cm 3 / g is implemented.
  • an inorganic or organic filler for example, preferably 10 to 35 wt .-%, based on the total weight of the copolyester iii, of an inorganic or organic filler can be used.
  • inorganic fillers are calcium carbonate, talc graphite, gypsum, conductive carbon black, iron oxide, calcium chloride, kaolin, silica (quartz), sodium carbonate, titanium dioxide, silicate, wollastonite, mica, montmorillonite and mineral fibers.
  • the minerals can also be used as nanofuel I e.
  • Nanofillers are, in particular, finely divided layered silicates, preferably clay minerals, particularly preferably montmorillonite containing clay minerals whose surface is coated with one or more Reren quaternary ammonium salts and / or phosphonium salts and / or sulfonium salts are modified.
  • Preferred clay minerals are natural montmorillonites and bentonites
  • Particularly preferred inorganic fillers are calcium carbonate and talc.
  • the calcium carbonate of the company Omya has proven to be suitable.
  • the calcium carbonate generally has an average particle size of 0.5 to 10 micrometers, preferably 1 to 5, particularly preferably 1 to 2.5 micrometers.
  • the talc from Mondo Minerals has proved suitable.
  • the talc usually has an average particle size of 0.5-10, preferably 1-8, more preferably 1-3 microns.
  • organic fillers such as starch or amylose can be added to copolyesters iii.
  • Starch and amylose may be native, i. not thermoplasticized or thermoplasticized with plasticizers such as glycerol or sorbitol (EP-A 539 541, EP-A 575 349, EP 652 910).
  • the inventive copolyester iii may contain further additives known to the person skilled in the art.
  • plastics technology such as stabilizers; nucleating agents; Lubricants and release agents such as stearates (especially calcium stearate); Plasticizers such as citric acid esters (especially acetyl tributyl citrate), glyceric acid esters such as triacetylglycerol or ethylene glycol derivatives, surfactants such as polysorbates, palmitates or laurates; Waxes such as erucic acid amide, stearic acid amide or behenamide, beeswax or beeswax esters; Antistatic, UV absorber; UV-stabilizer; Antifog agents or dyes.
  • the additives are used in concentrations of 0 to 5 wt .-%, in particular 0.1 to 2 wt .-% based on the polyesters of the invention.
  • Plasticizers may be present in 0.1 to 10% by weight in the polyesters of the invention.
  • biodegradable for a substance or a substance mixture is fulfilled if this substance or the substance mixture according to DIN EN 13432 has a percentage degree of biodegradation of at least 90%.
  • biodegradability causes the polyester (mixtures) to decompose in a reasonable and detectable time.
  • Degradation can be effected enzymatically, hydrolytically, oxidatively and / or by the action of electromagnetic radiation, for example UV radiation, and is usually effected for the most part by the action of microorganisms such as bacteria, yeasts, fungi and algae.
  • the biodegradability can be quantified, for example, by mixing polyesters with compost and storing them for a certain period of time. For example, according to DIN EN 13432 (referring to ISO 14855), CC air is allowed to flow through matured compost during composting and subjected to a defined temperature program.
  • biodegradability is determined by the ratio of the net C02 release of the sample (after deduction of C02 release by the compost without sample) for maximum release of C02 the sample (calculated from the carbon content of the sample) is defined as the percentage of biodegradation.
  • Biodegradable polyesters (mixtures) usually show clear degradation phenomena such as fungal growth, cracking and hole formation after only a few days of composting.
  • biodegradability is described, for example, in ASTM D 5338 and ASTM D 6400-4.
  • the disintegration tests listed in the application are based on the standard ISO 16929 (2013).
  • the abovementioned biodegradable copolyesters iii are suitable for the production of nets and fabrics, tubular films, chill-roll films with and without orientation in a further process step, with and without metallization or SiOx coating.
  • copolyesters iii defined at the outset are suitable for tubular films and stretch films.
  • Possible applications are here Bodenfalttama, side seam bags, carry bags with handle hole, shrink labels or shirt carrying bags, inliners, heavy bags, freezer bags, composting bags, agricultural films (mulch films), foil bags for food packaging, peelable sealing film - transparent or opaque - weldable sealing film - transparent or opaque - Sausage casing, salad foil, wrap film (stretch film) for fruit and vegetables, meat and fish, stretch wrap for wrapping pallets, foil for nets, packaging films for snacks, chocolate and muesli bars, peelable lidding films for dairy (yogurt, cream, etc.), fruit and vegetables Vegetables, semi-hard packaging for smoked sausage and cheese.
  • the copolyesters iii have a high tensile strength (according to EN ISO 6383-2: 2004) after extrusion into single- or multi-layered tube, cast or press foils. Tear strength is a very important product property, especially in the area of thin (tubular) films for e.g. Organic garbage bags or thin-walled carrier bags (e.g., tote tote bags, fruit bags). In addition, it is of particular importance for mulch films in the agricultural sector.
  • the determination of the viscosity numbers was carried out according to DIN 53728 Part 3, January 3, 1985, capillary viscosimetry.
  • a micro Ubbelohde viscometer, type M-II was used.
  • the solvent used was the mixture: phenol / o-dichlorobenzene in a weight ratio of 50/50.
  • the tensile properties of the polymers were determined according to ISO 527-2 on specimens according to ISO 527-S / 5A. The specimens were punched out of a press foil having a thickness of about 130 ⁇ m.
  • the molecular weight Mn of the triblocks ii was also determined by means of 1 H-NMR spectroscopy (solvent: 1,1,2,2-tetrachloroethane-D2). For this purpose, the sum of the integrals between 4.0 and 4.5 (CH2-OOCR) was compared to the PLA integral between 5.1 and 5.3, taking into account the previously determined Mn of the middle block x.
  • the molecular weights Mn of the multiblocks iii and the polydispersity index (PDI) of the polyesters were determined by means of gel permeation chromatography (GPC) according to DIN 55672-1; Eluent hexafluoroisopropanol (HFIP) + 0.05 wt.% Trifluoroacetic acid Ka salt; Calibration was carried out using narrowly distributed polymethyl methacrylate standards.
  • Composting for the qualitative assessment of the disintegration of press foils (approximately 280 ⁇ thickness): The test used is based on the standard ISO 16929 (2013, quantitative determination of disintegration over the mass balance), whereby only a qualitative visual assessment of the disintegration took place.
  • ecoflex® F1300 polybutylene terephthalate-co-adipate from BASF SE
  • Ingeo® 4043 D polychemical acid from NatureWorks
  • VZ 126 mL / g
  • Mn 44100 g / mol
  • PDI 7.2
  • Table 1 Mechanical data (Tensile test according to ISO 527 on press foils of the thickness given in the table)
  • copolyesters B3 to B5 according to the invention showed an optimized elongation at break / breaking stress behavior in comparison to a mixture of the two individual components (V1) and to films of copolyesters with a too low PLA content (15%, V2). V2 also had a very low modulus of elasticity and a poor rupture behavior. Copolyesters with a PLA content of greater than 49% had a high viscosity even before the addition of the diisocyanate, resulting in problems with the mixing. Furthermore, films made from such copolyesters no longer exhibited acceptable elongation behavior. Table 2: Result of the disintegration test

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Polyesters Or Polycarbonates (AREA)

Abstract

La présente invention concerne un copolyester biodégradable d'un poids moléculaire Mn de 10000 à 100000, mesuré par CPG, qui peut être obtenu par réaction vi) de 51 à 84% en poids, rapportés au copolyester, d'un bloc central de polyester ramifié à base d'acides dicarboxyliques aliphatiques ou aliphatiques et aromatiques et de composés dihydroxylés aliphatiques d'un poids moléculaire Mn de 5000 à 25000, mesuré par 1H-RMN, et vii) de 15,9 à 48,9% en poids, rapportés au copolyester, d'un lactide en présence d'un catalyseur puis par réaction du tribloc polyester ainsi obtenu d'un poids moléculaire Mn de 5800 à 49500, mesuré par 1H-RMN, et viii) de 0,1 à 3% en poids, rapportés au copolyester, d'un diisocyanate. En outre, la présente invention concerne un procédé de préparation et l'utilisation du copolyester biodégradable susmentionné.
EP15801468.8A 2014-12-05 2015-11-30 Polyester biodégradable Withdrawn EP3227352A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP14196578 2014-12-05
PCT/EP2015/078061 WO2016087372A1 (fr) 2014-12-05 2015-11-30 Polyester biodégradable

Publications (1)

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EP3227352A1 true EP3227352A1 (fr) 2017-10-11

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US (1) US10106642B2 (fr)
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WO2016087372A1 (fr) 2016-06-09
US20170362373A1 (en) 2017-12-21

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