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HIPS



Properties of UBEPOL-BR for HIPS

Typical Properties of UBEPOL-BR for HIPS
(The data of other companys' BR are also listed in comparison with UBEPOL-BR)

Table 1 Typical Properties of UBEPOL-BR
UBEPOL-
BR15HB		 UBEPOL-
BR15H		 UBEPOL-
BR15HL		 UBEPOL-
BR13HB 		UBEPOL-
BR22H 		UBEPOL-
BR34HL 		A (High-Cis) B (Low-Cis) C (Low-Cis)
Mooney Viscosity
(ML1+4, 100°C) 		40 43 43 30 41 34 44 34 52
Volatile Matter (wt. %) 0.3 0.3 0.3 0.3 0.3 0.3 -- -- --
Ash Content (wt. %) 0.05 0.05 0.05 0.05 0.05 0.05 0.08 0.02 0.02
Micro Structure
(wt.%)		 Cis 97 98 98 96 98 98 98 35 35
Trans 2 1 1 2 1 1 1 55 55
Vinyl 1 1 1 2 1 1 1 10 10
Molecular Weight & Molecular Weight Distribution w
(x 104)		 56 61 57 49 70 51 58 37 42.2
n
(x 104)		 17 21 23 13 15 22 18 15 17.4
w/n 3.3 2.9 2.5 3.8 4.7 2.3 3.2 2.5 2.4
Lineality of Molecular Chain less medium more less medium more -- -- --
5wt. % Solution in Styrene Solution Viscosity
(cps)		 60 92 135 41 202 91 64 87 166
Styrene Insolubles
(wt. %)		 0.005 0.005 0.005 0.005 0.005 0.005 0.015 0.003 0.003
APHA Color 10 10 10 10 10 10 15 10 10
Remarks Branching Type Equivalent to A Standard Type Linear Type Good Gloss Superior Impact Strength Good Balance between Gloss and Impact Resistance



Solution Viscosity and Rubber Content
The correlation between rubber content and solution viscosity is given in Fig. 1.

Fig. 1 Rubber Cont. in Styrene vs. Solution Viscosity

Cold Flow
Property of cold flow of UBEPOL-BR is shown in Fig. 2.

Fig. 2 Cold Flow of BR

Storage Stability
The change of physical properties of UBEPOL-BR15HB stored for a long time is shown on Table 2.

Table 2 The Change of Physical Properties of UBEPOL-BR15HB Stored for a Long Time
Properties Storage Time (day)
0 86 184 340 380
Mooney Viscosity (ML 1+4, 100°C) 41 41 41 40 41
5wt.% Solution in StyreneSolution Viscosity at 25°C (cps) 61 60 62 58 59
Styrene Insolubles (wt. %) 0.005 0.006 0.008 0.008 0.007
APHA Color 10 10 10 10 10


Pre-polymerization (at Bulk)
Rubber Content: 7 wt. %
Temperature: 135°C
Reactor: 1 lit. separable flask
Impeller: anchor type
Condition (1)
Chaintransfer: n-DM=0.03 wt. %
Condition (2)
Chaintransfer: n-DM=0.03 wt. %
Catalyst: PH-3M=0.03 wt. %
Polymerization (at Suspension)
Reactor: 1.5 lit. autoclave
Catalyst: BPO/DCP=0.2/0.2 wt. %
Stabilizer for Suspension: PVA
Temp. x Time: 100°C x 2 hrs
125°C x 3hrs
140°C x 2 hrs


(Note)
n-DM: n-Dodecyl mercaptane
PH-3M: 1, 1'-Di-(t-butylperoxy)
3, 3,5-trimethylcyclohexane
BPO: Benzoyl peroxide
DCP: Dicumyl peroxide
PVA: Polyvinylalcohol

Toluene Insolubles: Weight % Toluene Insolubles in HIPS
Swelling Index: (Wet Weight/Dry Weight) of Toluene Insolubles
MEK/Acetone Insolubles: Weight % of MEK/Acetone
Insolubles in HIPS
(MEK/Acetone=50/50)
Melt Flow Index: ASTM D1238, 200°C, 5 kg
Tensile Strength: ASTM D638
Elongation: ASTM D638
Izod Impact Strength: ASTM D256, Notched,
Thickness of Specimen 3.16mm
Gloss: JIS Z8741 Incidence Angle 60°C
Vicat Softening Point: ASTM D1525
Rubber Particle Size
Equipment: Caulter Counter, TA II Model
Dispersion Medium: Dimetlyl Formamide
Electrolyte: Ammonium Thiocyanate
Aperture Tube: 30µ


UBEPOL-BR15HB is characterized by the highest branching of these 3 grades and is adapted by many PS manufacturers. UBEPOL-BR15HL is a linear type of polymer with the high solution viscosity. In case of enlarging the dispersed rubber particle size in HIPS, or considering especially characteristics of HIPS manufacturing process this polymer can be useful for PS manufacturer. UBEPOL-BR15H is a in-between polymer of UBEPOL-BR15HB and UBEPOL-BR15HL.

Physical Properties of HIPS
Polymerization was performed by (1) and (2) of pre-polymerization condition, and the physical properties of the obtained HIPS are shown on Table 3

Table 3. Physical Properties of HIPS
Pre-polymerization Condition
 Grade Swelling Index MEK/
Acetone Insolubles
(wt.%)		 Rubber
Particle Size
(µ)		 Tensile Strength (MPa) Elongation (%) Izod
Impact Strength
(J/m)		 Gloss Vicat
Softening Point
(°C)		 Melt Flow
Index (g/10 min.)
at yield at break
(1)

n-DM =0.03wt. %

UBEPOL-
BR15HB		 10.9 23.0 2.1 30 29 22 76 59 101 3.6
UBEPOL-
BR15H		 10.7 23.3 2.5 29 29 23 75 56 101 3.5
UBEPOL-
BR15HL		 10.6 23.5 2.7 29 30 25 75 51 101 3.6
A (High-Cis) 10.8 22.8 2.2 30 29 22 75 59 101 3.5
B (Low-Cis) 10.0 24.7 1.8 31 30 20 66 63 101 3.5
C (Low-Cis) 9.9 26.2 2.2 32 31 20 64 58 101 3.5
(2)

n-DM =0.03wt. %

PH-3H =0.03wt. %

UBEPOL-
BR15HB		 13.3 23.4 0.9 34 30 7 59 78 101 2.8
UBEPOL-
BR15H		 12.9 23.5 1.0 33 30 8 70 80 101 2.7
UBEPOL-
BR15HL		 12.6 24.1 1.0 33 29 8 74 83 101 2.7
A (High-Cis) 13.2 23.0 0.9 34 30 7 58 79 101 2.8
B (Low-Cis) 12.1 25.3 0.8 35 32 6 49 85 101 2.8
C (Low-Cis) 11.9 26.4 0.9 36 33 6 51 83 101 2.8


Low Temperature Property of HIPS
Dependence of Izod impact strength on temperature is shown in Fig. 3. Low temperature property of HIPS modified by high cis BR is better than that modified by low cis BR.



Dissolving Time
UBEPOL-BR13HB has such characteristics as low solution viscosity and short dissolution time in styrene monomer. Fig. 4 shows the transient behavior of UBEPOL-BR13HB from the time when a certain amount of rubber is put into styrene monomer and is stirred until its solution viscosity increases and becomes constant.


Fig. 4-1 Dissolving Time of BR in Styrene


Fig. 4-2 Dissolving Time of BR in Styrene

Change of Motor Current During Pre-polymerization
The correlation between conversion ratio and motor current of agitator is given in Fig. 5. As UBEPOL-BR13HB is of low molecular weight and a branching type, its viscosity of polymer cement is low up to 6-7% of conversion ratio where a phase inversion takes place, which makes it possible to control to make rubber particle size smaller so that a type of high gloss HIPS can be obtained. In the case of UBEPOL-BR13HB, stirring power consumption is less for polymerization of HIPS.


Fig. 5 Conversion vs. Motor Current

Physical Properties of HIPS
Polymerization was performed by (1) and (2) of pre-polymerization condition, and the physical properties of the obtained HIPS are shown on Table 4

Table 4. Physical Properties of HIPS
Pre-polymerization Condition
 Grade Swelling Index MEK/
Acetone Insolubles
(wt. %)		 Rubber
Particle Size
(µ)		 Tensile Strength (MPa) Elongation (%) Izod
Impact Strength
(J/m)		 Gloss Vicat
Softening Point
(°C)		 Melt Flow Index
(g/10 min.)
at yield at break
(1)
n-DM=0.03 wt. % 		UBEPOL-
BR13HB		 11.2 22.1 1.6 31 30 20 72 68 101 3.6
UBEPOL-
BR15HB		 10.9 23.0 2.1 30 29 22 76 59 101 3.6
(2)
n-DM =0.03 wt.%
PH-3H=0.03 wt. % 		UBEPOL-
BR13HB		 13.7 21.9 0.8 35 31 7 53 82 101 2.8
UBEPOL-
BR15HB		 13.3 23.4 0.9 34 30 7 59 78 101 2.8




Molecular Weight Distribution
Molecular weight distribution of UBEPOL-BR22H is shown in Fig. 6 in comparison with UBEPOL-BR15HB and B (Low cis).

Physical Properties of HIPS
Polymerization was performed by (1) and (2) of pre-polymerization condition, and the physical properties of the obtained HIPS are shown on Table 5

Table 5. Physical Properties of HIPS
Pre-polymerization Condition
 Grade Swelling Index MEK/
Acetone Insolubles
(wt. %)		 Rubber Particle Size
(µ)		 Tensile Strength (MPa) Elongation
(%)		 Izod Impact Strength
(J/m)		 Gloss Vicat Softening Point
(°C)		 Melt Flow Index
(g/10 min.)
at yield at break
n-DM=0.03 wt. % (1) UBEPOL-
BR22H		 11.3 23.1 2.6 27 28 30 79 54 101 3.5
UBEPOL-
BR15HB		 10.9 23.0 2.1 30 29 22 76 59 101 3.6
B (Low-Cis) 10.0 24.7 1.8 31 30 20 66 63 101 3.5

n-DM =0.03 wt.%
PH-3H=0.03 wt. %(2)

UBEPOL-
BR22H		 13.5 23.6 1.0 33 29 15 78 80 101 2.8
UBEPOL-
BR15HB		 13.3 23.4 0.9 34 30 7 59 78 101 2.8
B (Low-Cis) 12.1 25.3 0.8 35 32 6 49 85 101 2.8


Physical Properties of MIPS (Medium Impact Polystyrene)
Polymerization was performed in different stirring rates under pre-polymerization condition (1) (2.5wt. % rubber content) and the characteristics of the obtained MIPS are shown on Table 6. The correlation between Izod impact strength and rubber particle size is shown in Fig. 7 and correlation between Elongation and Rubber particle size is shown in Fig. 8.

Table 6. Physical Properties of MIPS
Grade Stirring Rate (rpm) Swelling Index MEK/
Acetone Insolubles
(wt. %)		 Rubber Particle Size
(µ)		 Tensile Strength (MPa) Elongation
(%)		 Izod Impact Strength (J/m) Gloss Vicat Softening Point
(°C)		 Melt Flow Index
(g/10 min.)
at yield at break
UBEPOL-
BR22H		 600 12.7 7.3 1.4 41 39 5 29 96 101 8.3
500 12.8 7.8 1.6 38 37 5 33 94 101 8.2
400 13.0 8.2 2.1 36 36 8 38 92 101 8.0
300 13.3 8.8 2.8 36 36 10 42 87 101 8.1
UBEPOL-
BR15HB		 500 12.9 7.3 1.3 -- 41 3 22 97 101 8.1
400 12.7 7.8 1.5 -- 39 4 28 94 101 8.3
300 12.7 7.9 2.0 40 39 6 33 92 101 8.3
200 13.0 8.6 2.7 39 38 6 36 80 101 8.0




Physical Properties of HIPS
Polymerization was performed in different stirring rates under pre-polymerization condition (2) and the characteristics of the obtained HIPS are shown on Table 7. The correlation between gloss and rubber particle size is shown in Fig. 9 and correlation between gloss and Izod impact strength is shown in Fig. 10

Table 7. Physical Properties of HIPS
Grade Stirring Rate
(rpm)		 Swelling Index MEK/
Acetone Insolubles (wt. %)		 Rubber Particle Size
(µ)		 Tensile Strength (MPa) Elongation
(%)		 Izod Impact Strength
(J/m)		 Gloss Vicat Softening Point
(°C)		 Melt Flow Index
(g/10 min.)
at yield at break
UBEPOL-
BR34HL		 500 12.7 24.0 0.94 34 30 9 69 86 101 2.8
400 11.9 25.2 1.23 31 30 43 79 80 101 2.7
UBEPOL-
BR15HB		 500 13.3 23.4 0.89 34 30 7 59 78 101 2.8
400 12.5 24.4 1.18 33 30 34 74 74 101 2.6
B (Low-cis) 500 12.1 25.3 0.82 35 32 6 85 85 101 2.8



Fig. 9 Stirring Rate vs. Gloss


Fig. 10 Izod Impact Strength vs. Gloss




Application for HIPS

Tire for automobile and bicycle;

Sidewall, Tread.....

Articles for sports;

Golf ball, Tennis ball.....

Articles for industry;

 Belt, Hose, Vibration insolator, Cable.....




 
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