WO2011071667A1 - Article thermoformé fabriqué à partir de succinate de polybutylène (pbs) et de succinate de polybutylène modifié (mpbs) - Google Patents

Article thermoformé fabriqué à partir de succinate de polybutylène (pbs) et de succinate de polybutylène modifié (mpbs) Download PDF

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Publication number
WO2011071667A1
WO2011071667A1 PCT/US2010/056988 US2010056988W WO2011071667A1 WO 2011071667 A1 WO2011071667 A1 WO 2011071667A1 US 2010056988 W US2010056988 W US 2010056988W WO 2011071667 A1 WO2011071667 A1 WO 2011071667A1
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WO
WIPO (PCT)
Prior art keywords
article
polymer
poly
biodegradable polymer
pbs
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Application number
PCT/US2010/056988
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English (en)
Inventor
Wei Li
Richar A. Tedford
Bruce J. Thoman
Thomas Robert Christie
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International Paper Company
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Publication date
Application filed by International Paper Company filed Critical International Paper Company
Priority to CA2781973A priority Critical patent/CA2781973C/fr
Priority to EP10782141A priority patent/EP2510054A1/fr
Priority to CN201080055773.XA priority patent/CN102648242B/zh
Publication of WO2011071667A1 publication Critical patent/WO2011071667A1/fr

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Classifications

    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47G—HOUSEHOLD OR TABLE EQUIPMENT
    • A47G19/00—Table service
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L3/00—Compositions of starch, amylose or amylopectin or of their derivatives or degradation products
    • C08L3/02—Starch; Degradation products thereof, e.g. dextrin
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • MPBS SUCCINATE
  • the present invention broadly relates to thermoformed articles made of resins comprising pure Polybutylene succinate (PBS), or modified polybutylene succinate (MPBS), or mixture of these two, or blends based on these two via extrusion; their composition, manufacturing, and applications.
  • PBS Polybutylene succinate
  • MPBS modified polybutylene succinate
  • polymers for various disposable articles are widespread and well known in the art.
  • the heaviest use of polymers in the form of films and fibers occurs in the packaging and the disposable article industries.
  • Films employed in the packaging industry include those used in food and non-food packaging, merchandise bags and trash bags.
  • the general uses of polymers occurs in the construction of diapers, personal hygiene articles, instrument pads, bandages, and protective covers for various articles.
  • polymers that are water-responsive.
  • polymers such as polyethylene, polypropylene, polyethylene terephthalate, nylon, polystyrene, polyvinyl chloride and polyvinylidene chloride, are popular for their superior extrusion and film and fiber making properties, these polymers are not water-responsive. Furthermore, these polymers are generally non-compostable, which is undesirable from an environmental perspective.
  • Polymers and polymer blends have been developed which are generally considered to be water-responsive. These are polymers which purportedly have adequate properties to permit them to breakdown when exposed to conditions which lead to composting. Examples of such arguably water-responsive polymers include those made from starch biopolymers and polyvinyl alcohol.
  • PBS Polybutylene succinate
  • MPBS modified polybutylene succinate
  • Polybutylene succinate is a biodegradable aliphatic polyester with similar properties to PET. PBS is generally blended with other materials, such as bio fillers, mineral fillers, and other polyesters, to form MPBS, and to make its use economical.
  • PBS and MPBS have excellent mechanical properties and better heat resistance than that of PLA. They can be applied to a range of end applications via conventional melt processing techniques. Currently known applications include mulch film, packaging film, bags and
  • PLA is a biodegradable polymer that made from corn starch. It has been used to produce a few environment friendly products, like IP's Ecotainer. The limited thermal and mechanical properties of virgin PLA, however, become the restriction of its applications. Adding petroleum chemicals into PLA could improve the performance, but damaged the sustainability of the products.
  • the other biopolymers are, but not limit to, PBS, MPBS, and PHAs.
  • the natural fillers here are, but not limit to, cellulose fibers and powders; agriculture (for examples, rice husk, wheat bran, straw, corn cob%) fibers and powders; wood fibers and powders; and bamboo fibers and powders.
  • Polylactic acid is increasing in favor with consumers of plastic thermoformed articles as a renewable plastic which does not derive from fossil fuels and which is degradable in the environment.
  • PLA has a decreasing mechanical strength with increasing temperature.
  • an article formed from PLA may lose the ability to resist deformation by forces frequently found in transportation.
  • PLA may lose its ability to resist deformation to forces of the order of magnitude of gravity and residual mold stress. Prolonged exposure of PLA articles to temperatures of about 140°F (60°C) or higher may cause these articles to deform substantially from their original shape under forces which may be present in storage conditions.
  • PLA articles may suffer from high damage losses during transport through and storage in hot areas such as tractor trailers crossing, for example, the sunny warmer portions of the United States during the summer.
  • PBS based articles which have greater resistance to deformation at higher temperatures that may occur during, for example, storage and transportation in warmer, summer time periods, and contact with hot drink and hot food.
  • thermoformable resin comprising pure PBS, and /or MPBS, and / or mixture of these two, and / or blends based on these two via extrusion.
  • the resins can then be used in thermoforming, injection molding, and extrusion coating.
  • the present invention relates to articles made of a thermoformable resin comprising a biodegradable polymer having polybutylene succinate (PBS) via extrusion using an extruder which comprise: a biodegradable polymer having: (a) a T s value of up to about 160°C (e.g., in the range of from about 50° to about 150°C); (b) a heat distortion index of up to about 150°C (for example, up to about 120°C); and (c) optionally, a T m in the range of from about 70° to about 160°C (e.g., in the range of from about 80° to about 150°C).
  • Thermo formed article such as a food or beverage cup, lid, cutlery item, foodservice item, molded tray, food storage container, etc provide the ability to resist deformation during higher temperature conditions that may occur during storage and distribution.
  • One aspect of the present invention is directed to an article made of a thermoformable resin comprising a biodegradable polymer having polybutylene succinate (PBS) via extrusion using an extruder.
  • the article is in the form of a beverage lid.
  • the biodegradable polymer has a T s value up to about 150°C.
  • the biodegradable polymer has a heat distortion index of up to about 140°C.
  • the biodegradable polymer has a T m in the range of from about 40° to about 250°C.
  • the extruder is a co-rotating, twin-screw extruder or counter-rotating, twin-screw extruder.
  • Fig. 1 is a graph that shows a Differential Scanning Calorimetry (DSC) Spectrum of the first scan of PBS; and
  • FIG. 2 is a thermo forming system, where pellets of a biodegradable polymer such as PLA-PHA blend, are added to the extruder.
  • renewable polymer also known as “biopolymer” refers to a polymer, or a combination (e.g., blend, mixture, etc.) of polymers, which may be obtained from renewable natural resources, e.g., from raw or starting materials which are or may be replenished within a few years (versus, for example, petroleum which requires thousands or millions of years).
  • a renewable polymer may include a polymer that may be obtained from renewable monomers, polymers which may be obtained from renewable natural sources (e.g., starch, sugars, lipids, corn, sugar beet, wheat, other, starch-rich products etc.) by, for example, enzymatic processes, bacterial fermentation, other processes which convert biological materials into a feedstock or into the final renewable polymer, etc. See, for example, U.S. Pat. App. No. 20060036062 (Ramakrishna et al , published February 16, 2006, the entire disclosure and contents of which is hereby incorporated by reference.
  • renewable natural sources e.g., starch, sugars, lipids, corn, sugar beet, wheat, other, starch-rich products etc.
  • Renewable polymers useful in embodiments of the present invention may include polyhydroxyalkanoate polymers, polycaprolactone (PC frame face shipping and displaying L) polymers, starch-based polymers, cellulose-based polymers, etc., or combinations thereof. Renewable polymers may, but do not necessarily include, biodegradable polymers.
  • biodegradable polymer refers to a polymer which may be broken down into organic substances by living organisms, for example, microorganisms.
  • amorphous refers to a solid which is not crystalline, i.e., has no lattice structure which is characteristic of a crystalline state.
  • crystalline refers to a solid which has a lattice structure which is characteristic of a crystalline state.
  • high temperature deformation- resistant material refers to a material which resists deformation at a temperature of about 140°F (60°C) or higher, for example, about 150°F (65.6°C) or higher.
  • high temperature deformable material refers to a material which deforms at a temperature of less than about 140°F (60°C), for example, less than about 130°F (54.4°C).
  • thermoforming refers to a method for preparing a shaped, formed, etc., article from a thermoplastic sheet, film, etc.
  • the sheet, film, etc. may be heated to its melting or softening point, stretched over or into a temperature-controlled, single-surface mold and then held against the mold surface until cooled (solidified).
  • the formed article may then be trimmed from the thermoformed sheet.
  • the trimmed material may be reground, mixed with virgin plastic, and reprocessed into usable sheet.
  • Thermoforming may include vacuum forming, pressure forming, twin-sheet forming, drape forming, free blowing, simple sheet bending, etc.
  • thermoform and similar terms such as, for example "thermoformed,” etc., refers to articles made by a thermoforming method.
  • service temperature refers to temperature of hot liquid.
  • melting point refers to the temperature range at which a crystalline material changes state from a solid to a liquid, e.g., may be molten. While the melting point of material may be a specific temperature, it often refers to the melting of a crystalline material over a temperature range of, for example, a few degrees or less. At the melting point, the solid and liquid phase of the material often exists in equilibrium.
  • T m refers to the melting temperature of a material, for example, a polymer.
  • the melting temperature is often a temperature range at which the material changes from a solid state to a liquid state.
  • the melting temperature may be determined by using a differential scanning calorimeter (DSC) which determines the melting point by measuring the energy input needed to increase the temperature of a sample at a constant rate of temperature change, and wherein the point of maximum energy input determines the melting point of the material being evaluated.
  • DSC differential scanning calorimeter
  • the term “softening point” refers to a temperature or range of temperatures at which a material is or becomes shapeable, moldable, formable, deformable, bendable, extrudable, etc.
  • the term softening point may include, but does not necessarily include, the term melting point.
  • T s refers to the Vicat softening point (also known as the Vicat Hardness). The Vicat softening point is measured as the temperature at which a polymer specimen is penetrated to a depth of 1 mm by a flat-ended needle with a 1 sq. mm circular or square cross-section. A load of 9.81 N is used.
  • Standards for measuring Vicat softening points for thermoplastic resins may include JIS K7206, ASTM D1525 or ISO306, which are incorporated by reference herein.
  • T g refers to the glass transition temperature.
  • the glass transition temperature is the temperature: (a) below which the physical properties of amorphous materials vary in a manner similar to those of a solid phase (i.e., a glassy state); and (b) above which amorphous materials behave like liquids (i.e., a rubbery state).
  • HDT heat deflection temperature
  • HDTUL heat distortion temperature
  • HDI heat distortion index
  • ASTM D648 is a test method which determines the temperature at which an arbitrary deformation occurs when test samples are subjected to a particular set of testing conditions. This test provides a measure of the temperature stability of a material, i.e., the temperature below which the material does not readily deform under a standard load condition. The test sample is loaded in three-point bending device in the edgewise direction. The outer fiber stress used for testing is 1.82 MPa, and the temperature is increased at 2°C/min until the test sample deflects 0.25 mm.
  • melt flow index (also known as the “melt flow rate (MFR)) refers to a measure of the ease of flow of the melt of a thermoplastic polymer, and may be used to determine the ability to process the polymer in thermo forming.
  • MFI may be defined as the weight of polymer (in grams) flowing in 10 minutes through a capillary having a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures.
  • Standards for measuring MFI include ASTM D1238 and ISO 1133, which are herein incorporated by reference. The testing temperature used is 190°C with a loading weight of 2.16 kg.
  • the MFI of the polymers may be in the range from 0 to about 20 grams per 10 minutes, for example from 0 to about 15 grams per 10 minutes.
  • viscoelasticity and “elastic viscosity” refer interchangeably to a property of materials which exhibit both viscous and elastic characteristics when undergoing deformation. Viscous materials resist shear flow and strain linearly with time when a stress is applied, while elastic materials strain instantaneously when stretched and just as quickly return to their original state once the stress is removed. Viscoelastic materials have elements of both of these properties and, as such, exhibit time dependent strain. Whereas elasticity is usually the result of bond stretching along crystallographic planes in an ordered solid, viscoelasticity is the result of the diffusion of atoms or molecules inside of an amorphous material.
  • hydroxy aliphatic acids refers to organic aliphatic carboxylic acids having a hydroxy group, and which may be used to provide polyhydroxyalkanoates.
  • Hydroxy aliphatic acids useful herein may include lactic acid, hydroxy- beta-butyric acid (also known as hydroxy-3 -butyric acid), hydroxy-alpha-butyric acid (also known as hydroxy-2-butyric acid), 3-hydroxypropionic acid, 3-hydroxyvaleric acid, 4- hydroxybutyric acid, 4-hydroxyvaleric acid, 5-hydroxyvaleric acid, 3-hydroxyhexanoic acid, 4- hydroxyhexanoic acid, 6-hydroxyhexanoic acid, hydroxyacetic acid (also known as glycolic acid), lactic acid (also know as hydroxy-alpha-propionic acid), malic acid (also known as hydroxysuccinic acid), etc., and mixtures thereof.
  • polylactic acid or polylactide refers to a renewable, biodegradable, thermoplastic, aliphatic polyester formed from a lactic acid or a source of lactic acid, for example, renewable resources such as corn starch, sugarcane, etc.
  • PLA may refer to all stereoisomeric forms of PLA including L- or D- lactides, and racemic mixtures comprising L- and D-lactides.
  • PLA may include D- polylactic acid, L-polylactic acid (also known as PLLA), D, L-polylactic acid, meso-polylactic acid, as well as any combination of D-polylactic acid, L-polylactic acid, D, L-polylactic acid and meso-polylactic acid.
  • PLAs useful herein may have, for example, a number average molecular weight in the range of from about 15,000 and about 300,000.
  • bacterial fermentation may be used to produce lactic acid, which may be oligomerized and then catalytically dimerized to provide the monomer for ring-opening polymerization.
  • PLA may be prepared in a high molecular weight form through ring-opening polymerization of the monomer using, for example, a stannous octanoate catalyst, tin(II) chloride, etc.
  • cellulose-based polymer refers to a polymer, or combination of polymers, which may be derived from, prepared from, etc., cellulose.
  • Cellulose-based polymers which may be used in embodiments of the present invention may include, for example, cellulose esters, such as cellulose formate, cellulose acetate, cellulose diacetate, cellulose propionate, cellulose butyrate, cellulose valerate, mixed cellulose esters, etc. , and mixtures thereof.
  • the term “mineral filler” refers to inorganic materials, often in particulate form, which may lower cost (per weight) of the polymer, and which, at lower temperatures, may be used to increase the stiffness and decrease the elongation to break of the polymer, and which, at higher temperatures, may be used to increase the viscosity of the polymer melt.
  • Mineral fillers which may used in embodiments of the present invention may include, for example, talc, calcium chloride, titanium dioxide, clay, synthetic clay, gypsum, calcium carbonate, magnesium carbonate, calcium hydroxide, calcium aluminate, magnesium carbonate mica, silica, alumina, sand, gravel, sandstone, limestone, crushed rock, bauxite, granite, limestone, glass beads, aerogels, xerogels, fly ash, fumed silica, fused silica, tabular alumina, kaolin, microspheres, hollow glass spheres, porous ceramic spheres, ceramic materials, pozzolanic materials, zirconium compounds, xonotlite (a crystalline calcium silicate gel), lightweight expanded clays, perlite, vermiculite, hydrated or unhydrated hydraulic cement particles, pumice, zeolites, exfoliated rock, etc., and mixtures thereof
  • molded refers to any method for casting, shaping, forming, extruding, etc., softened or melted polymers, layers, composites, etc., of the present invention.
  • the term "blow molded” refers to a method of molding in which the material is melted and extruded into a hollow tube (also referred to as a parison). This parison may then be captured by closing it into a cooled mold and air is then blown into the parison, thus inflating parison into the shaped article. After the shaped article has cooled sufficiently, the mold is opened and the article is released (e.g., ejected).
  • compression molded refers to a method of molding in which the molding material, with optional preheating, is first placed in an open, heated mold cavity. The mold is closed with a top force or plug member, pressure is applied to force the material into contact with all mold areas, and heat and pressure are maintained until the molding material has cured.
  • heat-resistant polymer refers to a polymer (or polymers) which has an HDI value of greater than about 50°C, for example greater than about 65°C (e.g., greater than about 90°C).
  • heat-resistant polymers are resistant to deformation at temperatures above about 50°C, for example, above about 65°C (e.g., above about 90°C).
  • Heat-resistant polymers may or may not renewable polymers and may include polyolefins (e.g., polyethylene, polypropylene, etc.), polystyrenes, polyesters, polyamides, polyimides, polyurethanes, cellulose-based polymers, such as cellulose propionate, etc., and combinations thereof.
  • sheet refers to webs, strips, films, pages, pieces, segments, etc., which may be continuous in form (e.g., webs) for subsequent subdividing into discrete units, or which may be in the form of discrete units (e.g., pieces).
  • the term "extrusion” refers to a method for shaping, molding, forming, etc., a material by forcing, pressing, pushing, etc., the material through a shaping, forming, etc., device having an orifice, slit, etc., for example, a die, etc. Extrusion may be continuous (producing indefinitely long material) or semi-continuous (producing many short pieces, segments, etc.).
  • thermoplastic refers to the conventional meaning of thermoplastic, i.e., a composition, compound, material, etc., that exhibits the property of a material, such as a high polymer, that softens when exposed to sufficient heat and generally returns to its original condition when cooled to room temperature.
  • Thermoplastics may include, but are not limited to, polyesters (e.g., polyhydroxyalkanoates, polyethyleneterephthalate, etc.), poly(vinylchloride), poly(vinyl acetate), polycarbonates, polymethylmethacrylate, cellulose esters, poly(styrene), poly(ethylene), poly(propylene), cyclic olefin polymers, poly(ethylene oxide), nylons, polyurethanes, protein polymers, etc.
  • polyesters e.g., polyhydroxyalkanoates, polyethyleneterephthalate, etc.
  • poly(vinylchloride) poly(vinyl acetate)
  • polycarbonates polymethylmethacrylate
  • cellulose esters poly(styrene), poly(ethylene), poly(propylene), cyclic olefin polymers, poly(ethylene oxide), nylons, polyurethanes, protein polymers, etc.
  • the term "significant weight amount” refers to an amount of the renewable polymer which may be at least about 50% by weight of the composite, for example, at least about 80% by weight, ⁇ e.g., at least about 90%> by weight) of the composite.
  • articles comprising a thermoformable composite comprise: a renewable polymer having: (a) a T s value of up to about 160°C ⁇ e.g., in the range of from about 50° to about 150°C); (b) a heat distortion index of up to about 150°C (for example, up to about 130°C); and (c) optionally, a T m in the range of from about 70° to about 160°C ⁇ e.g., in the range of from about 80° to about 150°C).
  • a renewable polymer having: (a) a T s value of up to about 160°C ⁇ e.g., in the range of from about 50° to about 150°C); (b) a heat distortion index of up to about 150°C (for example, up to about 130°C); and (c) optionally, a T m in the range of from about 70° to about 160°C ⁇ e.g., in the range of from about 80° to about 150°C).
  • One embodiment of the present invention may be a thermoformed article such as a food or beverage cup, lid, cutlery item, foodservice item, molded tray, food storage container, etc.
  • Another embodiment of the present invention may be an article wherein the one or more of the resins may comprise one or more mineral fillers, for example, talc, calcium chloride, titanium dioxide, clay, etc., or mixtures thereof.
  • Another embodiment of the present invention may be an article wherein the resin may comprise a compatibilizer which enhances reextrusion of polymer or plastic trim pieces obtained during trimming of the article which may be used in thermoforming recycle operations.
  • Another embodiment of the present invention may be an article formed by compression molding or blow molding the thermoformable composite.
  • Another embodiment of the present invention may be an article formed from an extruded sheet from a roll fed through thermoforming operation, for example, with inline extrusion and thermoforming with recycle of trimmed polymer or plastic for regrinding.
  • FIG. 1 an embodiment an article comprising a thermoformable laminate composite according to the present invention is illustrated in FIG. 1 in the form of, for example, a beverage lid, indicated as 100.
  • Beverage lid 100 comprises an outer rim portion, indicated as 104, a center portion, indicated as 108, and a main body portion, indicated as 1 12, connecting center portion 108 and rim portion 104.
  • FIG. 2 shows thermoforming system, indicated generally as 300.
  • pellets of a renewable polymer such as PBS or MPBS
  • extruder indicated as 308
  • a temperature in the range of, for example, from about 130° to about 300°C (e.g., from about 150° to about 225°C).
  • the melted resin passes through a series chill rolls, indicated generally as 336.
  • Cold web 340 passes through a remelt oven, indicated as generally 344, where cold web 340 is softened or melted at a temperature, for example, in the range of from about 100° to about 200°C (e.g., from about 120° to about 180°C)., to provide a thermoformable web, indicated generally as 348.
  • Thermoformable web 348 is passed through a thermoforming or molding section at a temperature , for example, in the range of from about 10° to about 100°C (e.g., from about 20° to about 80°C), indicated generally as 352, to provide a thermoformed or molded articles, of three are schematically shown and indicated as 356-1 , 356-2 and 356-3.
  • Thermoformed article 356-2 is shown as passing through a trimmer press 358 for remove excess material (e.g., flashing) to provide finished article 356-3, which may then exits system 300, as indicated by arrow 360.
  • the trimmed material from article 356-2 may be recycled, as indicated by arrow 364.
  • Recycled material 364 is sent to a chopper or grinder, indicated as 368, to provide size reduced recycled material.
  • the size reduced recycled material is then returned, as indicated by arrow 372 for blending with PBS or MPBS pellets in extruder 308.
  • PBS Polybutylene succinate
  • the resin pellets was extruded into 17 mil thickness sheet stock on a single screw extruder (Davis Standard 3 1/2" diameter, 32:1 L/D.); and then the sheet stock was
  • Figure 1 is the DSC spectrum of PBS resin. It shows that the PBS resin has a melt temperature T m at 113° C, which is higher than the service temperature of hot drink (normally around 90°C).
  • the Leaking rate is the leaking from the side seam of a cup/lid system. While the cup with lid is placed in a level position, measure the weight of water collected in 20 seconds. The 0.9292 value is within our QC control limit.

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  • Chemical Kinetics & Catalysis (AREA)
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Abstract

La présente invention concerne des articles fabriqués à partir d'une résine thermoformable comprenant un polymère biodégradable contenant du succinate de polybutylène (PBS) par extrusion en utilisant une extrudeuse qui comprennent : un polymère biodégradable ayant : (a) une valeur Ts allant jusqu'à environ 160 °C (par exemple, dans la plage d'environ 50° à environ 150 °C) ; (b) un indice de déformation thermique allant jusqu'à environ 150 °C (par exemple, jusqu'à environ 120 °C); et (c) facultativement, un Tm dans la plage d'environ 70° à environ 160 °C (par exemple, dans la plage d'environ 80° à environ 150 °C). Un article thermoformé tel qu'un récipient pour aliments ou boisson, un couvercle, un article de type couvert, un article de service de table, un plateau moulé, un conteneur de stockage d'aliments, etc., présente la capacité de résister à la déformation dans les conditions de température élevée qui peuvent survenir pendant le stockage et la distribution.
PCT/US2010/056988 2009-12-08 2010-11-17 Article thermoformé fabriqué à partir de succinate de polybutylène (pbs) et de succinate de polybutylène modifié (mpbs) WO2011071667A1 (fr)

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Application Number Priority Date Filing Date Title
CA2781973A CA2781973C (fr) 2009-12-08 2010-11-17 Article thermoforme fabrique a partir de succinate de polybutylene (pbs) et de succinate de polybutylene modifie (mpbs)
EP10782141A EP2510054A1 (fr) 2009-12-08 2010-11-17 Article thermoformé fabriqué à partir de succinate de polybutylène (pbs) et de succinate de polybutylène modifié (mpbs)
CN201080055773.XA CN102648242B (zh) 2009-12-08 2010-11-17 由聚丁二酸丁二醇酯(pbs)或改性的聚丁二酸丁二醇酯(mpbs)制得的热成型制品

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Application Number Priority Date Filing Date Title
US26765809P 2009-12-08 2009-12-08
US61/267,658 2009-12-08

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WO2011071667A1 true WO2011071667A1 (fr) 2011-06-16

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CA2781973C (fr) 2014-10-07
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