Next Stage of Polystyrene

TOYO STYRENE Co.,Ltd.

<Lineup of Toyo Styrene's High Functional Polystyrene>

Lid for Hot Drink

Example of Deep Drawing

HMT‐PS（High Melt Tension PS）
Various Food Packages
Foamed Deep Drawing Cups

Good Moldability
for Foamed PS

ESCR‐HIPS(Environmental Stress CrackingResistance)
Lids for Hot Drink Cup
Food Packages for Oily Food
Improvement of Strength
Oil Resistance

Conventional
GPPS／HIPS
Heat Resistance

TF‐polymer/TFP
Microwavable Food Packages

Lunch Boxes

Package for "DONBURI"

Minimize Residual
Monomer/Oligomer

High Purity GP/HI
Reduction of Gas evolution at Molding
Reduction of Elute Materials from Packages

Packages of Low Oligomer

Packages of Low Volatile
MonomerTOYO STYRENE High Functional GPPS and HIPS
1. High Melt Tension Polystyrene(HMT‐PS)
HMT‐PS has very high Melt Tension and high Strain‐Hardening property by our own polymerization technology.
It is good material for SHEET/FILM production.
Forming productions of HMT‐PS have good FORMABILITY, THICKNESS UNIFORMITY.
High strain‐Hardening(HMT‐PS)

Low strain‐Hardening(Conventional GPPS)

Uniform thickness layer formation

Broken or Large uneven thickness

HMT‐PS polymer structure
Physical properties of HMT‐PSunit
Melt mass flow rate

g/10min

1.0

Vicat softening temp.

℃103

Charpy impact strength

kJ/m2

2.1

High Mz/Mw

Tensile breaking stress

MPa

45

Low Mz/Mw

Tensile breaking strain%

3

Flexural strength

MPa

100

Flexural modulus

MPa

3,200

[Application]
・Polystyrene Paper (PSP, Foamed expansion sheet for food container)・Expanded Polystyrene board (XPS, Foamed heat insulation material)
・Biaxial oriented Polystyrene(BOPS)[Forming test of PSP]ＨＭＴ－ＰＳ

HMT-PS・Injection blow formed productions
・Inflation films・HIPS sheet formed package
Forming samples with HMT‐PS (PSP containers)

Conventional GPPS

Food container thickness

A-1

HMT‐PS
Conventional GPPS

C-15

A-15

C-1
B-1

B-13

Compression strength of food
HMT‐PS
Conventional GPPS

Measuring method

TOYO STYRENE High Functional GPPS and HIPS
2．ESCR‐HIPS／Impact Modifier for HIPS
Improved Oil Resistance of HIPS by Polymerization Technologies
Application : Lids for Hot Drink Cup, Food Packages for Oily Food, Inner Panels of Refrigerator and so onUse as Impact Modifier Less Expensive, Substitute for SBR (Enable to Reduce Cost 5‐15%)
Resistance Test for HIPS and Various Oil
Conventional HI

Lid for Hot Drink Cup

Inner Panels of Refrigerator

Physical Properties
Properties

Test method

ESCR‐PS

Aging time

1hour 24hours 1hour 24hours

Rapeseed oil

Poor

Poor

Good

Good

Sesami oil

Good

Poor

Good

Good

Olive oil

Poor

Poor

Good

Good

Rice oil

Good

Poor

Good

Good

Butter

Good

Poor

Good

Good

Lard

Good

Poor

Good

Good

Fresh cream

Poor

Poor

Good

Good

Test Method
Good

Poor

Resistance Test for HIPS and Various Kitchen Items
Conventional HI

unit

Melt mass flow rate

ISO 1133

g/10min

3.3

Vicat softening temp.

ISO 306℃

CriticalStrain (%)

ESCR‐PS

Judge

CriticalStrain (%)

Judge88

Soy Sauce

0.2

Poor>1.1

Good2

Charpy impact strength

ISO 179

kJ/m

19

Ketchup

0.2

Poor>1.1

Good

Tensile breaking stress

ISO527‐1,527‐2

MPa

22

Vinegar

0.3

Poor>1.1

Good

Tensile breaking strain

ISO527‐1,527‐2%

70

Detergent (neutral)

0.2

Poor

0.5

Fair

Flexural strength

ISO 178

MPa

38

Detergent (alkaline)

0.5

Fair

>1.1

Good

Flexural modulus

ISO 178

MPa

1750

Critical Strain: Calculated byDefined Formula and CrackedPoint(Toyo Styrene Method)

Cracked Point

3．Improvement of Heat Resistance
Improved Heat Resistance of Polystyrene, then named "TF‐polymer" and "TFP" with Higher Strength
Application : Microwavable and the other Food Packages , Foamed PS Tray and so on
Heat Resistance of Various Polystyrene
121117103

Package for "DONBURI"

Lunch Boxes