Polyethylene terephthalate modification using VistamaxxTM

performance polymers

VistamaxxTM performance polymers

Introduction to VistamaxxTM performance polymers

PET modification using VistamaxxTM polymers

• Virgin PET modification

• Expanding possibilities with post-consumer recycle PET

Summary

Discussion

Agenda

Vistamaxx™ performance polymers are

Semi-crystalline copolymers

• based on ExxonMobil proprietary metallocene technology

• with tunable amorphous content

• compatible with other polyolefinicmaterials

• uniform inter and intramolecular composition and crystallinity distribution

Produced in Singapore

• capacity: 300,000 tons per year

Isotactic PP microcrystalline regions

Amorphous regions

New possibilities, expanding product portfolio

Current offerings in polymer modification

• High viscosity grades typically as impact modifier

New Vistamaxx™ performance polymer grades

• Low viscosity grades can be used as flow modifiers

Vistamaxx™ performance polymers

4

6

8

10

12

14

16

100 1,000 10,000 100,000 1,000,00010,000,000

Viscosity @ 190°C (mPa.s)

~25k~10k~5k~1k 500 100 10

3980FL

3000

6202

~ ~

MFR (230°C/2.16 kg)

High viscosity gradeLow viscosity grade

50

6502

88803588FL

6102

3020FL

8380*8780*

*8380/8780: dusting needed prior to use

Incre

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len

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Incr

ea

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g c

ryst

all

init

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• VistamaxxTM polymer can be used as polyethylene terephthalate (PET) modifier

• Improved dispersion by selecting the right compatibilizer

• Recommended grade: VistamaxxTM 6102• Suggested loading: 5 to 20 wt%• Recommended compatibilizer: maleated VistamaxxTM polymer• Optimal compatibilizer-to-VistamaxxTM polymer ratio: 3:10

Polyethylene terephthalate modification

Features Benefits from blending with VistamaxxTM polymers

Improved impact strength Reduce part breakage

Low density Lighter part weight

Higher peak crystallization temperature Potential for increased productivity, cycle time reduction

Low cost alternative vs other impact modifiers Maintain cost competitiveness

Virgin PET modification

Objective• Demonstrate properties delivered by the use of VistamaxxTM polymers• Optimize the use of compatibilizer for maximum cost competitiveness

Formulations

Testing• Differential scanning calorimetry (DSC) – ExxonMobil method• Tensile test – ISO 527• Notched Izod impact – ISO 180/1A

• Temperatures: room temperature, 0 °C, -20 °C

• Melt-flow rate (MFR) - (265 °C / 2.16 kg) Based on ISO 1133• Morphology analysis via atomic force microscopy (AFM)• Fractographic analysis via scanning electron microscope (SEM)

Virgin PET modification study

Formulation [wt%]

Blend Virgin PET* Vistamaxx 6102 Compatibilizer**

A 87 13 -

B 87 12 1

C 87 10 3

D 87 7 6

*Arnite® A04 900. Medium viscosity, nucleated. Injection molding grade.**Acti-Tech 16MA13. Maleic anhydride grafted Vistamaxx.

• VistamaxxTM polymer can help overcoming PET’s slow crystallization by increasing the peak crystallization temperature

• Addition of a compatibilizer to improve Vistamaxx polymer dispersion in PET does not have counterproductive effects

Wait less… produce more

• Optimal formulation for highest performance at lowest raw material cost

Optimizing compatibilizer content

Blend A Blend B Blend C Blend D

Delamination observed No delamination

AFM images: 20 x 20 µm

• Strong PET/VistamaxxTM 6102 interface leads to tougher final parts

Effect of compatibilizer

Fracture surface of notched Izod specimens tested at 0 °C

Virgin PET 13 wt% Vistamaxx 61023 wt% Acti-Tech 16MA1310 wt% Vistamaxx 6102

• Impact strength: 3.7 kJ/m2

• Featureless fracture surface• Brittle fracture

• Impact strength: 5.2 kJ/m2

• Weak PET/Vistamaxx 6102 interface

• Slightly higher toughness due to increased surface area of fracture

• Impact strength: 9.6 kJ/m2

• PET plastic deformation before fracture

• Superior toughness

• VistamaxxTM polymers can improve PET impact strength not only at room temperature (RT) but also at low temperatures (-20 °C)

Tougher over a wide range of temperatures

Benefits with compatibilizer/VistamaxxTM polymer solution• Improved impact strength over a wide range of temperatures• Higher peak crystallization temperature

Virgin PET modification – properties overview

Expanding possibilities with post-consumer recycled PET

Objectives• Demonstrate modified properties with post-consumer recycle (PCR) PET• Compare VistamaxxTM polymers solution vs reference ethylene - acrylic ester –

glycidyl methacrylate terpolymer

Formulations

Testing• Melt-flow rate (MFR) – (265 °C / 2.16 kg) Based on ISO 1133• Tensile test – ISO 527• Notched Izod impact – ISO 180/1A

• Temperatures: room temperature, 0 °C, -20 °C

Post-consumer recycled PET modification

Formulation [wt%]

Blend Clear PCR PET* #1 #2

PolyPET KL100 100 87 87

Ethylene terpolymer - 13 -

Vistamaxx 6102 - - 10

Acti-Tech 16MA13 - - 3

*PolyPET KL100, PCR bottle grade.

• Lower motor torque and die pressure* allows for:

• Increased output

• Decreased die buildup and scorching

• Lower energy consumption

Processing benefits

*Under same extrusion conditions.

• Comparable performance at room temperature (RT)• Better performance at low temperature

Impact modification vs ethylene terpolymers

Benefits with VistamaxxTM polymer solution• Cost competitiveness • Higher impact strength• Higher elongation at break• Better property balance

PCR PET modification – properties overview

Summary

• Higher peak crystallization temperature even when compared to a PET injection molding nucleated grade

• Improved impact strength over a wide range of temperatures

• Reduced raw material cost vs other polyester modifiers like ethylene terpolymers

• Optimized formulation for maximum performance-to-cost ratio

Summary

Thank you

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