WO1990010667A1 - Composition of recycled polyethylene terephthalate and method of making rigid foamed articles from it - Google Patents

Composition of recycled polyethylene terephthalate and method of making rigid foamed articles from it Download PDF

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Publication number
WO1990010667A1
WO1990010667A1 PCT/EP1990/000361 EP9000361W WO9010667A1 WO 1990010667 A1 WO1990010667 A1 WO 1990010667A1 EP 9000361 W EP9000361 W EP 9000361W WO 9010667 A1 WO9010667 A1 WO 9010667A1
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WO
WIPO (PCT)
Prior art keywords
pet
polyethylene terephthalate
composition
anhydride
manufacture
Prior art date
Application number
PCT/EP1990/000361
Other languages
French (fr)
Inventor
Verity Smith
Edwin William Trevitt
Original Assignee
Tisslan S.A.
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 Tisslan S.A. filed Critical Tisslan S.A.
Publication of WO1990010667A1 publication Critical patent/WO1990010667A1/en

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • B29B17/0026—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting
    • B29B17/0042—Recovery of plastics or other constituents of waste material containing plastics by agglomeration or compacting for shaping parts, e.g. multilayered parts with at least one layer containing regenerated plastic
    • 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
    • C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J11/00—Recovery or working-up of waste materials
    • C08J11/04—Recovery or working-up of waste materials of polymers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock
    • Y02P20/143—Feedstock the feedstock being recycled material, e.g. 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

Definitions

  • the present invention is concerned with a composition of matter based on polyethylene terephtalate (PET), preferably but not necessarily waste PET in the form of used PET bottles, and with a method of making rigid foam products from this composition.
  • PET polyethylene terephtalate
  • a first object of the present invention thus consists in making a composition based on PET, which can be used for the manufacture of stable foams, that is to say, a composition with a melt viscosity considerably higher than that of unmodified PET bottle grade; it is especially wished to provide a method for the chemical modification of PET, so as to make it suitable for the manufacture of closed cell foams.
  • This purpose is obtained by means of a composition resulting from the reaction of PET with a polyfunctional carboxylic acid anhydride, more particularly at a tempera ⁇ ture between 250° and 300°C.
  • a further object of the invention consists in making foamed articles, such as an insulating board usable in the building industry, treating a mixture of dried PET and of the anhydride of a polyfunctional carboxylic acid in a quantity between 0.05% and 2% by weight of the PET, at a temperature between 250° and 300°, to obtain a composition of modified PET with a higher viscosity.
  • PET is a linear condensation polymer which behaves as typical thermoplastic material with a very low melt viscosity.
  • the present inventors have stated that in reacting the PET with a very small amount of a polycarboxylic acid anhydride a composition is obtained with an unexpectedly higher melt viscosity than that of the unmodified PET, probably due to the formation a reticulated three-dimensional structure by reaction of the terminal hydroxyl groups, present in the PET, with the anhydride.
  • a nucleating agent such as a powdered mineral or polymeric material, for example 2% of a master batch of 40% activated talc dispersed in polystyrene. This also serves to accelerate the crystal ⁇ lisation of the modified PET after extrusion, which reduces the time necessary to achieve a solid and stable foam structure.
  • PET must first be very carefully dried, using for example the methods used in preparing PET for bottle manufacture, to a level of not more than 0.01% water.
  • PET is hygroscopic and, at the temperature of the reaction with an anhydride, it is readily hydrolysed by the presence of water. Such hydrolysis results in chain scission and hence in a reduc ⁇ tion of molecular weight. This, of course, reduces the viscosity, which is the opposite of the purpose of the in ⁇ vention.
  • One of the essential aspects of the invention is the possibility of making foam articles in a single operation, the chemical modification of the PET being effected directly in an extruder or an injection moulding machine, using waste PET bottles which have been comminuted and dried, or similarly dried virgin PET polymer, and then mixed with the anhydride and fed to said extrusion or in ⁇ jection moulding machine.
  • the reactants may be fed through a port in the cylinder of the extrusion machine .
  • polycarboxylic acid anhydrides examples include pyromellitic acid dianhydride and trimellitic acid an ⁇ hydride. These may be used in amounts between 0.05% and 2.5% of the weight of the PET, preferably between 0.1 and 0.5 wght %.
  • blowing agents such as 5-phenyl indole and azodicar- bonamide, volatile liquids such as pentane, chlorofluoro- hydrocarbons such as "Freon 12", or hydrochlorofluorocar- bons such as CHC1F2(HCFC - 22).
  • compositions refers to the per cent by weight in relation to the weight of PET.
  • Bottle scrap, film or fibre is comminuted in a rotary granulator, the ground material passing through a 5 mm screen. It is then dried in a standard drying equipment such as a "Conair Churchill D06H" for four hours at 180°C, to reach a water content not greater than 0.01%.
  • Dried PET as obtained above, is fed to an L.M.P. type RC2L twin screw co-rotating intermeshing extruder fitted with a 4 mm die.
  • the temperatures indicated (starting from the feed end) were 259°, 268°, 273°, 274° and 260°. At a pressure of 3 bars, the extrudate diameter was 4 mm.
  • a quantity of PET was mixed, in a tumbler mixer, with 0.25% of pyromellitic dianhydride, and fed to the ex- truder. Extruding at the same temperatures as in the previous run, the pressure in the die head had risen to 30 bar and the diameter of the extrudate was 10.5 mm. The in ⁇ crease in pressure and the increase in diameter of the ex ⁇ trudate indicated a considerable rise in the intrinsic viscosity of the PET.
  • PET was mixed in a tumbler mixer with 0.25% of pyromellitic dianhydride and 2% of a nucleating agent comprising 40% activated talc dispersed in polystyrene.
  • the mixture was fed to the extruder and "Freon 12" gas was introduced at the discharge end of the screws at a pressure of 50 bar.
  • Foam was extruded having a diameter of 14.5 mm at an extruder head pressure of 20 bar.
  • the foam obtained has a specific gravity of 0.21.
  • a mixture of dried PET with 0.2% pyromellitic acid dianhydride and 2% nucleating agent (40% activated talc in polystyrene) was mixed in tumbler mixer and fed to an L.M.P. RC2L extruder, fitted with an 8 mm die. Temperature settings were (from the feed end) 262°, 269°, 273°, 274° and the die was held at 259°. "Freon 12" was introduced at 50 bar. The die head pressure was 30 bar and a foamed ex ⁇ trudate of 35 mm diameter was obtained. The foam obtained had a specific gravity of 0.2.

Abstract

A thermoplastic compound having a melt viscosity sufficient for the manufacture of foams is obtained by reacting PET with 0.05 % to 2.5 % of the anhydride of a polyfunctional carboxylic acid at a temperature between 250C and 300C. This composition is ideally suited to the recycling of PET waste into panels of rigid foam.

Description

COMPOSITION OF RECYCLED POLYETHYLENE TEREPHTHALATE AND METHOD OF MAKING RIGID FOAMED ARTICLES FROM IT
The present invention is concerned with a composition of matter based on polyethylene terephtalate (PET), preferably but not necessarily waste PET in the form of used PET bottles, and with a method of making rigid foam products from this composition.
For some years the accumulation of PET scrap, notably used beverage bottles, has become a serious problem for the authorities responsible for the disposal of solid wastes. The use of recycled PET for the manufacture of beverage bottles is not permitted by the health regula¬ tions, whereas other applications for recycled PET such as fibres for filling anoraks and duvets are not sufficiently large to absorb the available wastes.
However, it is generally considered that PET cannot be made into rigid foam because its melt viscosity is too low and that in consequence it will not retain the bubbles of an expanding gas. A first object of the present invention thus consists in making a composition based on PET, which can be used for the manufacture of stable foams, that is to say, a composition with a melt viscosity considerably higher than that of unmodified PET bottle grade; it is especially wished to provide a method for the chemical modification of PET, so as to make it suitable for the manufacture of closed cell foams.
This purpose is obtained by means of a composition resulting from the reaction of PET with a polyfunctional carboxylic acid anhydride, more particularly at a tempera¬ ture between 250° and 300°C.
A further object of the invention consists in making foamed articles, such as an insulating board usable in the building industry, treating a mixture of dried PET and of the anhydride of a polyfunctional carboxylic acid in a quantity between 0.05% and 2% by weight of the PET, at a temperature between 250° and 300°, to obtain a composition of modified PET with a higher viscosity. It is then pos¬ sible to foam this material by methods known to those skilled in the art, especially in an extruder or injection moulding machine, in order to manufacture an insulating board, which is stronger, particularly in respect to im¬ pact strength, than the conventional expanded polystyrene board, and given the low price of the waste raw material, which is considerably cheaper to manufacture than expanded polystyrene board.
It is known that PET is a linear condensation polymer which behaves as typical thermoplastic material with a very low melt viscosity. However, the present inventors have stated that in reacting the PET with a very small amount of a polycarboxylic acid anhydride a composition is obtained with an unexpectedly higher melt viscosity than that of the unmodified PET, probably due to the formation a reticulated three-dimensional structure by reaction of the terminal hydroxyl groups, present in the PET, with the anhydride.
It has also been stated that, under certain condi¬ tions, a further increase in the viscosity can be obtained by the subsequent or simultaneous addition of a polyfunc- tional alcohol, such as, for example, pentaerythritol (in an amount of about 0,1 - 2 wght %) .
Better results as regards the even structure of the foam were obtained by adding a nucleating agent, such as a powdered mineral or polymeric material, for example 2% of a master batch of 40% activated talc dispersed in polystyrene. This also serves to accelerate the crystal¬ lisation of the modified PET after extrusion, which reduces the time necessary to achieve a solid and stable foam structure.
Finally, it is essential to note that the PET must first be very carefully dried, using for example the methods used in preparing PET for bottle manufacture, to a level of not more than 0.01% water. PET is hygroscopic and, at the temperature of the reaction with an anhydride, it is readily hydrolysed by the presence of water. Such hydrolysis results in chain scission and hence in a reduc¬ tion of molecular weight. This, of course, reduces the viscosity, which is the opposite of the purpose of the in¬ vention.
One of the essential aspects of the invention is the possibility of making foam articles in a single operation, the chemical modification of the PET being effected directly in an extruder or an injection moulding machine, using waste PET bottles which have been comminuted and dried, or similarly dried virgin PET polymer, and then mixed with the anhydride and fed to said extrusion or in¬ jection moulding machine. Alternatively, the reactants may be fed through a port in the cylinder of the extrusion machine .
Examples of the polycarboxylic acid anhydrides include pyromellitic acid dianhydride and trimellitic acid an¬ hydride. These may be used in amounts between 0.05% and 2.5% of the weight of the PET, preferably between 0.1 and 0.5 wght %.
For the extrusion of rigid foam, usual blowing agents may be employed, such as 5-phenyl indole and azodicar- bonamide, volatile liquids such as pentane, chlorofluoro- hydrocarbons such as "Freon 12", or hydrochlorofluorocar- bons such as CHC1F2(HCFC - 22).
Examples of the invention will be described as fol¬ lows. The percentage in the compositions refers to the per cent by weight in relation to the weight of PET.
Preparation of dried PET
Bottle scrap, film or fibre is comminuted in a rotary granulator, the ground material passing through a 5 mm screen. It is then dried in a standard drying equipment such as a "Conair Churchill D06H" for four hours at 180°C, to reach a water content not greater than 0.01%.
Example 1
Dried PET, as obtained above, is fed to an L.M.P. type RC2L twin screw co-rotating intermeshing extruder fitted with a 4 mm die. The temperatures indicated (starting from the feed end) were 259°, 268°, 273°, 274° and 260°. At a pressure of 3 bars, the extrudate diameter was 4 mm.
A quantity of PET was mixed, in a tumbler mixer, with 0.25% of pyromellitic dianhydride, and fed to the ex- truder. Extruding at the same temperatures as in the previous run, the pressure in the die head had risen to 30 bar and the diameter of the extrudate was 10.5 mm. The in¬ crease in pressure and the increase in diameter of the ex¬ trudate indicated a considerable rise in the intrinsic viscosity of the PET.
A further quantity of PET was mixed in a tumbler mixer with 0.25% of pyromellitic dianhydride and 2% of a nucleating agent comprising 40% activated talc dispersed in polystyrene. The mixture was fed to the extruder and "Freon 12" gas was introduced at the discharge end of the screws at a pressure of 50 bar. Foam was extruded having a diameter of 14.5 mm at an extruder head pressure of 20 bar. The foam obtained has a specific gravity of 0.21.
Example 2
A mixture of dried PET with 0.2% pyromellitic acid dianhydride and 2% nucleating agent (40% activated talc in polystyrene) was mixed in tumbler mixer and fed to an L.M.P. RC2L extruder, fitted with an 8 mm die. Temperature settings were (from the feed end) 262°, 269°, 273°, 274° and the die was held at 259°. "Freon 12" was introduced at 50 bar. The die head pressure was 30 bar and a foamed ex¬ trudate of 35 mm diameter was obtained. The foam obtained had a specific gravity of 0.2.

Claims

1. Thermoplastic composition having a melt viscosity suitable for the manufacture of rigid foams, which com¬ prises a polyethylene terephthalate modified by reaction with the anhydride of a polyfunctional carboxylic acid.
2. Method of manufacture of a composition as claimed in claim 1, characterized by the reaction of PET with 0.05% to 2.5%, preferably between 0.1% and 0.5%, of the an¬ hydride of a polyfunctional carboxylic acid at a tempera¬ ture between 250°C and 300°C.
3. Method of manufacture of a rigid foam, which comprises the introduction of dried PET mixed with 0.1% to 0.5% of an anhydride of a polyfunctional carboxylic acid, the reaction of the mixture at a temperature of 250°C to 300°C in an extrusion machine or an injection moulding machine and the injection of a gas to produce the foamed article.
4. Method according to claim 3, in which a nucleating agent, such as a powdered mineral or polymeric material, is added to the reacting mixture.
5. Method according to claim 4, in which the nucleating agent is a 40% dispersion of activated talc in poly¬ styrene .
6. Method according to one of claims 2 to 5, in which the anhydride is chosen from pyromellitic dianhydride and trimellitic anydride.
7. Method according to one of claims 3 to 6, in which a blowing agent is added, which is chosen from a gas such as carbon dioxide, nitrogen, "Freon 12" or CHC1F2, a chemical blowing agent such as 5-phenyl tetrazole or azodicar- bonamide, and a volatile liquid such as pentane.
8. Method accordance to one of claims 2 to 7, in which the polyethylene terephthalate used is constitued of recovered waste, comminuted and dried.
9. Articles in modified PET foam obtained by the method according to one of claims 2 to 8.
10. Application of the method according to claim 8 to the recycling of waste polyethylene terephthalate to the production of articles in rigid foam.
PCT/EP1990/000361 1989-03-09 1990-03-05 Composition of recycled polyethylene terephthalate and method of making rigid foamed articles from it WO1990010667A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH881/89A CH678184A5 (en) 1989-03-09 1989-03-09
CH881/89-5 1989-03-09

Publications (1)

Publication Number Publication Date
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Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0475142A2 (en) * 1990-09-05 1992-03-18 Harold Verity Smith Moulding composition of polyethylene terephthalate reacted with a copolymer of maleic anhydride
WO1992017520A1 (en) * 1991-03-29 1992-10-15 M. & G. Ricerche S.P.A. Process for the production of high molecular weight polyester resins
WO1993012164A1 (en) * 1991-12-16 1993-06-24 M. & G. Ricerche S.P.A. Foamed cellular polyester resins and process for their preparation
US5223544A (en) * 1992-03-31 1993-06-29 Shell Oil Company Process for the removal of foreign materials from a post-consumer plyethylene terephthalate feed stream
US5472997A (en) * 1992-01-16 1995-12-05 Sicowa Verfahrenstechnik Fur Baustoffe Gmbh & Co., Kg Process for reprocessing plastic wastes
US5475037A (en) * 1993-02-02 1995-12-12 The Dow Chemical Company Amorphous polyester foam
CH686082A5 (en) * 1994-03-11 1995-12-29 Alusuisse Lonza Services Ag Foamed polyester moulding compsn. made from recycled polyester
EP0719626A2 (en) * 1994-12-27 1996-07-03 Sekisui Kaseihin Kogyo Kabushiki Kaisha Continuous manufacturing method and manufacturing apparatus of thermoplastic polyester resin foam
US5536793A (en) * 1993-01-29 1996-07-16 Amoco Corporation Concentrate for use in the melt fabrication of polyester
WO1999054380A1 (en) * 1998-04-16 1999-10-28 Havel-Chemie Ag Method for producing polyester alcohols, and polyester alcohols
DE19903700A1 (en) * 1999-01-30 2000-08-03 Tobias J Zimmermann Recycling of polyethylene terephthalate (PET) to produce polyester thermoset, involves reaction of epoxidised rape seed oil with PET/terephthalic acid adduct
US6187830B1 (en) 1997-07-11 2001-02-13 Akzo Nobel Nv Process for the preparation of foamed articles
US20110171456A1 (en) * 2010-01-11 2011-07-14 Armacell Enterprise Gmbh Insulation material providing structural integrity and building elements and composites made thereof
US20110171446A1 (en) * 2010-01-13 2011-07-14 Armacell Enterprise Gmbh Method for fire protection and modification of properties of expanded polyesters
US8080191B2 (en) 2006-10-20 2011-12-20 Pepsico, Inc. Extrudable polyethylene terephthalate blend
WO2012120148A1 (en) 2011-03-10 2012-09-13 Nexam Chemical Ab Compositions for improving polyesters
US8404755B2 (en) 2008-04-18 2013-03-26 Pepsico, Inc. Polyester composition and method for preparing articles by extrusion blow molding
EP2383309B1 (en) 2010-04-29 2016-11-23 Armacell Enterprise GmbH & Co. KG Cellular polyester made of post-consumer flakes and the use of products made thereof
EP3608081B1 (en) 2018-08-06 2021-03-17 Gargiulo GmbH Foamed polyethylene terephthalate insulating component with profile structure for heat insulation and method for manufacturing such a component
US11192996B2 (en) 2019-04-25 2021-12-07 Nan Ya Plastics Corporation Recycled PET foam material and method for manufacturing the same
CN114805775A (en) * 2022-05-17 2022-07-29 华润化学材料科技股份有限公司 Regenerated PET (polyethylene terephthalate) polyester, regenerated flame-retardant PET foam material and preparation method thereof

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US6130261A (en) * 1997-05-20 2000-10-10 Genpak, L.L.C. Method of recycling polyester foam

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Cited By (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0475142A3 (en) * 1990-09-05 1992-10-07 Harold Verity Smith Moulding composition of polyethylene terephthalate reacted with a copolymer of maleic anhydride
EP0475142A2 (en) * 1990-09-05 1992-03-18 Harold Verity Smith Moulding composition of polyethylene terephthalate reacted with a copolymer of maleic anhydride
WO1992017520A1 (en) * 1991-03-29 1992-10-15 M. & G. Ricerche S.P.A. Process for the production of high molecular weight polyester resins
WO1993012164A1 (en) * 1991-12-16 1993-06-24 M. & G. Ricerche S.P.A. Foamed cellular polyester resins and process for their preparation
US5362763A (en) * 1991-12-16 1994-11-08 M. & G. Ricerche S.P.A. Foamed cellular polyester resins and process for their preparation
AU659910B2 (en) * 1991-12-16 1995-06-01 Airex Ag Foamed cellular polyester resins and process for their preparation
US5422381A (en) * 1991-12-16 1995-06-06 M. & G. Richerche S.P.A. Foamed cellular polyester resins and process for their preparation
EP0866089A1 (en) * 1991-12-16 1998-09-23 SINCO RICERCHE S.p.A. Foamed cellular polyester resins and process for their preparation
US5472997A (en) * 1992-01-16 1995-12-05 Sicowa Verfahrenstechnik Fur Baustoffe Gmbh & Co., Kg Process for reprocessing plastic wastes
US5223544A (en) * 1992-03-31 1993-06-29 Shell Oil Company Process for the removal of foreign materials from a post-consumer plyethylene terephthalate feed stream
US5536793A (en) * 1993-01-29 1996-07-16 Amoco Corporation Concentrate for use in the melt fabrication of polyester
US5475037A (en) * 1993-02-02 1995-12-12 The Dow Chemical Company Amorphous polyester foam
CH686082A5 (en) * 1994-03-11 1995-12-29 Alusuisse Lonza Services Ag Foamed polyester moulding compsn. made from recycled polyester
EP0719626A3 (en) * 1994-12-27 1996-12-11 Sekisui Plastics Continuous manufacturing method and manufacturing apparatus of thermoplastic polyester resin foam
EP0719626A2 (en) * 1994-12-27 1996-07-03 Sekisui Kaseihin Kogyo Kabushiki Kaisha Continuous manufacturing method and manufacturing apparatus of thermoplastic polyester resin foam
US5958164A (en) * 1994-12-27 1999-09-28 Sekisui Kaseihin Kogyo Kabushiki Kaisha Method of manufacturing thermoplastic polyester resin foam by extrusion
CN1081977C (en) * 1994-12-27 2002-04-03 积水化成品工业株式会社 Method and device for continuous making thermoplastic polyester resin foam
US6537404B1 (en) 1994-12-27 2003-03-25 Sekisui Kaseihin Kogyo Kabushiki Kaisha Continuous manufacturing method and manufacturing apparatus of thermoplastic polyester resin foam
US6254977B1 (en) 1994-12-27 2001-07-03 Sekisui Kaseihin Kogyo Kabushiki Kaisha High molecular weight thermoplastic polyester resin foam
US6187830B1 (en) 1997-07-11 2001-02-13 Akzo Nobel Nv Process for the preparation of foamed articles
WO1999054380A1 (en) * 1998-04-16 1999-10-28 Havel-Chemie Ag Method for producing polyester alcohols, and polyester alcohols
DE19903700A1 (en) * 1999-01-30 2000-08-03 Tobias J Zimmermann Recycling of polyethylene terephthalate (PET) to produce polyester thermoset, involves reaction of epoxidised rape seed oil with PET/terephthalic acid adduct
US8080191B2 (en) 2006-10-20 2011-12-20 Pepsico, Inc. Extrudable polyethylene terephthalate blend
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