Global Patent Index - EP 1244540 A4

EP 1244540 A4 2002-11-06 - PROCESS FOR PREPARING FOOD CONTACT GRADE POLYETHYLENE TEREPHTHALATE RESIN FROM WASTE PET CONTAINERS

Title (en)

PROCESS FOR PREPARING FOOD CONTACT GRADE POLYETHYLENE TEREPHTHALATE RESIN FROM WASTE PET CONTAINERS

Title (de)

VERFAHREN ZUR HERSTELLUNG VON ZUM KONTAKT MIT LEBENSMITTELN GEEIGNETEM POLYETHYLENTEREPHTHALAT AUS PET-BEHÄLTER-ABFALL

Title (fr)

PROCEDE DE PREPARATION DE RESINE POLYETHYLENE TEREPHTHALATE APTE AU CONTACT ALIMENTAIRE A PARTIR DE RECIPIENTS PET JETABLES

Publication

EP 1244540 A4 (EN)

Application

EP 00965627 A

Priority

  • AU 0001131 W
  • AU PQ294699 A

Abstract (en)

[origin: WO0121373A1] A process for preparing food contact grade PET from a waste stream containing PET and non PET materials is disclosed. The process involves the steps of sorting at least some of the non PET materials from the waste stream, followed by dividing the PET containers into flakes of preferable maximum size approximately 10mm, followed by washing the flakes in a hot aqueous medium containing alkaline materials and surfactants, preferably non-ionic, to remove particulate and absorbed contaminants from the surfaces of the flakes. This step is followed by de-watering and then drying the flakes to a moisture content of 0.1 % w/w maximum, and more preferably 0.01 % w/w maximum. The next step involves removing absorbed contaminants and moisture by heating and vigorously mixing the flakes under vacuum, preferably 1-10 millibar, more preferably 2-7 millibar and at a temperature less than the melting point of PET, preferably in the range 170-220 DEG C for at least 30 minutes, preferably at least 60 minutes. The final step involves melting the flakes in a screw extruder equipped for vacuum processing and extruding the molten material to form strands that are pelletised.

IPC 1-7 (main, further and additional classification)

B29B 17/02; B29B 13/06

IPC 8 full level (invention and additional information)

C08J 3/12 (2006.01); B29B 9/06 (2006.01); B29B 13/00 (2006.01); B29B 17/00 (2006.01); B29B 17/02 (2006.01); B29B 17/04 (2006.01); B29C 47/00 (2006.01); B29K 67/00 (2006.01); B29K 105/26 (2006.01)

CPC (invention and additional information)

B29B 17/02 (2013.01); C08J 11/04 (2013.01); B29B 17/0412 (2013.01); B29B 2013/002 (2013.01); B29B 2013/005 (2013.01); B29B 2017/0289 (2013.01); B29B 2017/0293 (2013.01); B29C 47/0004 (2013.01); B29C 47/0011 (2013.01); B29K 2067/00 (2013.01); B29K 2067/003 (2013.01); B29K 2105/065 (2013.01); B29K 2105/26 (2013.01); B29L 2031/712 (2013.01); B29L 2031/7158 (2013.01); C08J 2367/02 (2013.01); Y02P 20/143 (2015.11); Y02W 30/622 (2015.05); Y02W 30/625 (2015.05); Y02W 30/70 (2015.05)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

EPO simple patent family

WO 0121373 A1 20010329; AU 7631000 A 20010424; AU 777435 B2 20041014; AU 777435 C 20060223; AU PQ294699 A0 19991014; BR 0014094 A 20020521; CA 2384878 A1 20010329; EP 1244540 A1 20021002; EP 1244540 A4 20021106; JP 2003509249 A 20030311; KR 20020055580 A 20020709; NZ 517832 A 20020628

INPADOC legal status


2004-01-02 [18D] APPLICATION DEEMED TO BE WITHDRAWN

- Effective date: 20030625

2003-04-02 [17Q] FIRST EXAMINATION REPORT

- Effective date: 20030214

2002-11-06 [A4] DESPATCH OF SUPPLEMENTARY SEARCH REPORT

- Effective date: 20020923

2002-11-06 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A4

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-11-06 [RIC1] CLASSIFICATION (CORRECTION)

- Free text: 7B 29B 17/02 A, 7B 29B 13/06 B

2002-10-02 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20020409

2002-10-02 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE

2002-10-02 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO:

- Free text: AL;LT;LV;MK;RO;SI