Aroma Barrier & Low Extractables
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Aroma Barrier & Low Extractables

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Learn how TOPAS COC can improve aroma barrier and product purity. TOPAS resin also delivers many other benefits - moisture protection, easy forming, high shrink, easy opening, superb twist, and more.

Learn how TOPAS COC can improve aroma barrier and product purity. TOPAS resin also delivers many other benefits - moisture protection, easy forming, high shrink, easy opening, superb twist, and more.

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Aroma Barrier & Low Extractables Presentation Transcript

  • 1. 2005 PLACE Conference September 27-29 Las Vegas, Nevada TOPAS Cyclic Olefin Copolymers in Food Packaging – High Aroma Barrier Combined with Low ExtractablesPresented by:Randy JesterAssociate Engineer
  • 2. TOPAS® COC A New Addition to the Ethylene Copolymer Family  Polyolefin Resin  Amorphous  Clear and Colorless  High Purity  High Moisture Barrier  Good Chemical Resistance  Easy to Process2
  • 3. Production Plant in Oberhausen, Germany  Production plant on stream since Oct 2000  30 000 tons / year production capacity  Backward integrated in Norbornene  Largest Cyclic Olefin Copolymer (COC) plant in the world Large scale production of COC enables the production of a cost competitive product for use in packaging applications3
  • 4. COC - Synthesis and Structure H 2C CH2 +  Readily available raw Ethylene Cyclopentadiene Norbornene materials  Highly efficient catalyst + H 2C CH2  Low usage  Catalyst removed as part of Metallocene process Catalysis  High purity product ( )( m ) n  Amorphous  Crystal clear COC4
  • 5. COC is Amorphous The COC molecule is a chain of small CH2-CH2 links randomly interspersed with large bridged ring elements It cannot fold up to make a regular structure, i.e., a crystallite NB NB NB NB COC has no crystalline melting point, but only a glass transition temperature, Tg , at which the polymer goes from “glassy” to “rubbery” behavior5
  • 6. COC - Basic Properties Glass transition temperatures, °C(°F)  Glass Clear, Transparent  Glass clear, Transparent 33 - 180 (91 – 356)  Sterilizable via Steam, EtO, Modulus of elasticity, N/mm2 (kpsi) gamma, beta (E-beam) 1260 – 3200 (180 – 460)  Resistant to Alcohols, Acids, Tensile strength, N/mm2 (kpsi) Bases, Polar Solvents 25 - 63 (3.6 - 9.1)  High Purity, Low Extractables Density, g/cm3 1.02  Low Water Transmission Rate Water uptake, % (WVTR) < 0.01  Biocompatible WVTR, g-mil/100 in2 × day (38°C/90%RH) 0.24 – 0.49  Halogen-free6
  • 7. COC – Regulatory Status  FDA Regulation 21 CFR 177.1520 (3.9)  COC FDA Food Contact Notification (FCN #75) became effective August 22, 2000, covers films, sheets, and articles made therein from and molded articles for repeated use.  COC FDA Food Contact Notification (FCN #405) became effective May 20, 2004, expands #75 to cover all applications, including bottles.  FDA Drug Master File, DMF# 12132, established.  FDA Device Master File, MAF# 1043, established.  The monomers are listed in the EU Directive 2002/72/EG  Norbornene has a SML = 0.05 mg/kg. COC can meet all major regulatory requirements for food contact and medical use7
  • 8. 23C/50% TOPAS® COC - Barrier Properties 10 000 Oxygen Barrier [cm3·mil/100 in2·atm·d] 1 000 LDPE EVA12 PCL HDPE PC BOPP Cellulose Acetate 100 PP PS PVC ® COC plasticized TOPAS PVC hard 10 PET PA 6 PCTFE Starch PEN 1 PAN MXD PVdC Cellulose 0.1 EVOH LCP Sources: Permeability Properties of Plastics and Elastomers, Massey, 2nd Edition; various datasheets; internal data 0.01 0.01 0.1 1 10 100 1 000 10 000 Water Vapor Barrier [g·mil/100 in2·atm·d] 38C/90% COC can extend the shelf life of products due to its very high moisture barrier8
  • 9. COC in LLDPE blends can reduce gas/vapor transmission rates by 70 – 90% at blend levels as low as 80%. This blend level typically achieves >90% of the barrier of 100% COC.9
  • 10. Reduced Flavor Scalping Scalped d-Limonene 1400.00 1195.08 1200.00 1110.76 Concentration (ng/cm2) Purge & Trap-Thermal 1000.00 Desorpt ion-GC-M S Analysis Dat a 800.00 600.00 400.00 200.00 0.00 100% COC 100% LLDPE Scalping of d-Limonene by COC is similar to that of LLDPE, indicating that the solubility of d-Limonene in COC is similar to that of LLDPE10
  • 11. Factors Affecting Permeability  Permeability (normalized transmission) is the product of diffusivity (kinetic factor) and solubility (thermodynamic factor).  The similar levels of equilibrium scalping indicate that solubility of d-limonene is similar in LLDPE and COC.  This information indicates that the primary factor affecting the reduced permeability of COC is diffusivity.11
  • 12. Glassy vs. Rubbery State  The COC grades in this study have Tg’s in the 68-80oC range, well above the measurement conditions. LLDPE on the other hand has a Tg of –128oC and is in a rubbery state.  Polymers in the rubbery state typically have a higher free volume due to a high level of molecular mobility, which increases diffusion rates of permeants.  Polyethylene and COC are both non-polar materials and would in general have similar solubility parameters for most permeants.  It can be generalized that for many permeants, COC will produce an improved barrier as compared to polyethylene since it will typically be in the glassy state under use conditions.12
  • 13. Reduced Extractables Elevated temperature (60oC for 24 hours) extraction shows that COC has significantly lower extractables than LLDPE including about 50% lower oligomer levels which can produce off tastes in food13
  • 14. Conclusions  COC has better aroma barrier than polyethylene and can reduce aroma/flavor loss from food when it is utilized as a barrier layer in food packaging.  COC can also reduce the transmission of objectionable odors to surrounding areas and should have utility in disposable food storage bags.  Low extractables in COC reduces the possibility of generating an “off- taste” in water or susceptible foods when used as a contact layer or just under a seal layer in packaging.14