Low viscosity Vistamaxx™ 8880 for new possibilities in polymer modification

Vistamaxx™ performance polymers

Develop innovative solutions that can improve product performance and manufacturing efficiency with Vistamaxx™ performance polymers. Because Vistamaxx 8880 has a much lower viscosity than other grades, it provides opportunities for compounders, converters and OEMs to add value. Using Vistamaxx 8880 as a compound modifier enhances polyolefin blend properties, improves processing efficiency and reduces the dosage of processing aids.

Improved processabilityThe processing efficiency for compounding and conversion processes can be enhanced due to the low viscosity of Vistamaxx 8880. Its higher melt flow rate can facilitate higher output, leading to cost efficiencies for compounding, injection molding and extrusion processes. The dosage of processing aids can also be reduced with Vistamaxx 8880, which improves compound processability and the surface quality of end-use products.

% of Vistamaxx 8880 0% 10% 20% 35%

Melt flow rate (230 °C/2.16 kg) 20 34 45 74

Melt flow rate of Vistamaxx 8880 compounded with Vistamaxx 6202

10

100

1000

200 2000

Vis

cosi

ty, P

a•s

Shear rate, 1/s

95% 6202 + 5% 8880

65% 6502 + 35% 888095% 6502 + 5% 8880

55% 6502 + 45% 8880

2

8

14

18

6

12

4

10

16

1 100 ~1000010 1000

61026202

6502

3020FL

3000

3980FL

3588FL

8880*

~100000

Ethy

lene

con

tent

, wt.%

MFR, 230 °C/2.16 kg

ViscosityVistamaxx grades

*MFR of 8880 is from a conversion of viscosity data.

Injection molding for PP modification applications Blended solutions of different Vistamaxx™ performance polymer grades were evaluated to optimize the crystallization speed. DSC results demonstrate that several blends with increased Tc will help resolve processing problems.

Validation has been conducted at the Shanghai Technology Center using a Demag injection molding machine to process a 4*6*0.2cm plaque made with ExxonMobil™ PP3155E5 homopolymer and ExxonMobil AP03B impact copolymer resins. The cycle time is recorded using a thermal imager when the plaque gate temperature is less than 90°C. Minimum clamp force is recorded when there is no flash and a stable part weight.

Cycle time

0

10

20

30

40

50

60 (s)

ExxonMobil PP3155E5 ExxonMobil AP03B

10% Vistamaxx

8880

0% Vistamaxx

7.5% 8880 +

2.5% 6202

5% 8880 +

5% 6202

2.5% 8880 +

7.5% 6202

10%6202

Crystallization temperature

0

10

20

30

40

50

60

0 2 4 6 8

100% 8880 50% 8880 + 50% 6202

100% 6202

10 12 14 16 18C2(%)

Tc (°C)

Clamp force

0

100

200

300

400

500

600

0% Vistamaxx

10%8880

10%6202

5%8800 +

5% 6202

2.5%8880 +7.5%6202

7.5%8880 +2.5%6202

ExxonMobil PP3155E5 ExxonMobil AP03B

(N)

Enhanced injection molding Cycle time is critical to injection molders as it can influence production efficiency. The benefits of Vistamaxx™ 8880 in injection molding processing are proven when it is added to a Vistamaxx polymer-rich base formulation. Injection pressure can be reduced due to the lower viscosity of Vistamaxx 8880 and cooling efficiency (see crystallization analysis) is improved. With a controlled cooling temperature, Vistamaxx compounds achieve comparable cycle time performance to SEBS compounds for soft thermoplastic elastomer (TPE) applications such as grips and other soft-touch overmolding TPE applications.

Injection molding process comparison between SEBS compounds and Vistamaxx based compounds

Processing SEBS compoundsVistamaxx based compounds

Vistamaxx based compounds with 8880

Melt temperature

Injection pressure

Cycle time With chilled water

0

30

50

60

20

10

40

0 20 4010 30 50

Tc,

°C

Vistamaxx 8880 content, %

Crystallization analysis of Vistamaxx 8880 compounded with Vistamaxx 6202

The addition of Vistamaxx 8880 to Vistamaxx 6202 increases crystallization temperature, facilitating faster injection molding cycle time.

The images above are demonstrative of typical applications for ExxonMobil Chemical products

V1118-000E49

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Contact us for more information:exxonmobilchemical.com/vistamaxx

Grades

Physical Hardness Mechanical Thermal

Density*Viscosity* at 190˚C (374˚F)

Ethylene content*

Durometerhardness (Shore C)Based on ASTM D2240

Tensile stress* at 100%

Tensile strength* at break

Elongation* at break

Glass transition* Tg

Melting temperature* Tm

8880 0.879 g/cm3 1200 mPa•s 6 wt% 53 4.0 MPa 6.2 MPa 1237 % -22 °C 97 °C

* Based on ExxonMobil methodData generated by or on behalf of ExxonMobil Chemical, cited from product datasheet version of 09/16/2015, based on ASTM or ExxonMobil method.

Typical values

Typical values

Grades

MFR230°C/2.16 kgExxonMobil method g/10 min

Density1

ASTM D1505g/cm3

Durometer hardness ASTM D2240 Shore D/A

Tensile strength1

@break ASTM D638 MPa (psi)

Elongation1

@break ASTM D638 %

Flex mod1,2

1% secant ASTM D790 MPa (psi)

Tear strength1 Die C ASTM D624 kN/m (lbf/in)

Vicat softening temperature ExxonMobil method °C (°F)

3000 8 0.873 27D >13.8 (>2000) >800 62.4 (9050) 63.9 (365) 65.1 (149)

3020FL** 3 0.874 29D >14.5 (>2100) >800 65.3 (9470) 65.1 (372) 67.0 (153)

3980FL** 8 0.879 34D >19.3 (2800) >800 117 (17000) 83.4 (476) 77.3 (171)

3588FL** 8 0.889 50D 26.0 (3770) 637 402 (58400) 127 (724) 103 (217)

6102/6102FL** 3 0.862 67A >7.58 (>1100) >800 14.4 (2090) 33.3 (190) 53.9 (129)

6202/6202FL** 20 0.862 64A >5.52 (>800) >800 12.8 (1860) 32.0 (183) 45.2 (113)

6502 45 0.865 71A >7.58 (>1100) >800 20.4 (2960) 40.6 (232) 51.4 (125)

** FL grades pass ExxonMobil Chemical’s test for film appearance with regard to gels, as needed for performance film applications (‘A’ rating)1. All physical properties were measured on specimens cut from compression molded plaques per ASTM D4703, Procedure A, Type I and conditioned at

23ºC for a minimum of 40 hours per ASTM D618 prior to testing.2. 1% secant @ break.Data generated by or on behalf of ExxonMobil Chemical, cited from product datasheet version of 01/01/2017, based on ASTM or ExxonMobil method.