use Polybutadiene Rubber use UBE INDUSTRIES,LTD. Wings of technology Spirit of innovation ,:.

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1 @ Polybutadiene Rubber '..! Wings of technology Spirit of innovation use UBE INDUSTRIES,LTD.,:.

2 Introdu ctio n UBEPOL VCR isa new type of synthetic rubber developed by UBE's technology. UBEPOL VCR consists ofmicro-dispersed Syndiotactic 1,2-polybutadiene(SPB) with high melting point and crystallinity, and high cis-l,4-polybutadiene rubber matrix. UBEPOL VCR is improved on the processability and a lot ofthe physical properties of conventional polybutadiene rubber. These characteristics àre as follows: In case of same compound recipe eexcellent open roll mill processability esmall mill shrinkage and smooth surface eexcellent extrudability - Small die swell with excellent smooth surface and sharp edge ehigh hardness and high modulus egood tear resistance egood fatigue resistance egood Pico abrasion resistance '. In case of same modulus (In this case, less carbon is required to prepare the UBEPOL VCR 's vulcanizates of same modulus) ~ elower compound mooney viscosity elower heat build-up eweight reduction ofrubber products(low specific gravity)

3 1. Raw Polymer Properties ofubepol VCR use Table 1 Raw polymer properties Grade VCR412 VCR617 VCR450 VCR800 Mooney viscosity ML 1 +4,10O C n-hexane Insolubles (wt) Micro eis (wt) structure *2 trans (wt) vinyl (wt) *1 ; Syndiotactic 1,2-palybutadlene(SPB) content m VeR *2 ; Microstructure of Matrix Polymer UBEPOL VCR412 is a standard type of UBEPOL VCR which has the excellent processability and the good physical properties. UBEPOL VCR617 contains about 17wt syndiotactic 1,2- polybutadiene(spb) and emphasizes processability, high hardness and high modulus. UBEPOL VCR450 is designed to contain about 4wt SPB in high eis- 1,4-polybutadiene rubber matrix which has a broad molecular weight distribution and a high linearity of molecular chain, in order to wellbalance processability with physical properties. UBEPOL VCR800 has about 5wt SPB, and improves the processability compared to VCR450., Basic Characteristics of Syndiotactic 1,2-Polybutadiene(SPB) emelting point About 200 C ecrystallinity 70'"'-'80 edispersion of SPB Fig.l Xl00000, - '--:: J " " O. l/lm Fig.l Dispersion of SPB in Polybutadiene Rubber Matrix(TEM micrograph) SPB has so high a melting point that SPB doesn't melt in practical use, for example, in míxíng processo Fi!!.1shows that SPB is micro-disnersed in nolvbutadiene rubber matrix. 2

4 2. Properties ofastm recipe use *1 Table 2 Compound properties Recipe ; ASTM D3189 Grade VCR412 VCR617 VCR450 VCR800 BR150 ML1+4,100oe ~ ML (dn'm) MH (dn'm) Tsl rrun Tc(50) mm Tc(90) mino Extrusion rate (g/min) Mooney viscosity Curing rate Extrudability *2 die swell Mill shrinkage *1 ; Compound recipe and procedure according to ASTM D3189 *2; ASTM D2230 screw diameter; 20mm cp, Screw L/D; 8, Screw rotational speed; 75rpm Table 3 Vulcanizate properties Curing time Grade Hardness TypeA 100 Modulus 200 Modulus. 50min VCR412 VCR617 VCR450 VCR BR Tensile strength Elongation kn/m e INDEX Modulus Tear resistance Rebound Compression BS set Heat build-up LlT P.S Pico abrasion : Lamboum slip rate 20 INDEX abrasion slip rate 60 INDEX time >30 27 Cut growth (2rnm-15mm) Cut generation 4 x10 time >30 Table 2 shows that UBEPOL VCR has excellent extrudability compared with high cis-l,4-polybutadiene rubber in spite of high compound mooney viscosity. Also, UBEPOL VCR has excellent open roll mill behavior, especially at high temperature condition. Fig.2 shows open roll mill behavior of UBEPOL VCR412 compared with UBEPOL BR150. And UBEPOL VCR has the advantage of high hardness, high modulus, good tear resistance. Pico abrasion resistance and cut erowtb resistance. 4 '.

5 Surface Temp. of Roll UBEPOL VCR412 UBEPOL BR150,. Fig.2 Open Mill Roll behavior ecompound recipe ecompound is aged for a day after compounding eopen mill roll condition; Roll size Roll speed Roll nip clearance 6" ifj x12"l Front 24rpm, Rear 30rpm lmm

6 3. Properties ofnrlbr blend recipe Table 4 Physical properties in the case of same hardness recipe Grade UBEPOL UBEPOL UBEPOL BR150 VCR412 VCR617 Raw polymer properties Mooney viscosity(ml1 +4,100 C SPB content ( ) O Recipe *1 Carbon black content (phr) Compound properties Mooney viscosity(ml 1 + 4,100 C) Extrudability Extrusion rate (glmin) Die swell Physical properties Hardness Modulus () Modulus () Modulus () Tensile strength () Elongation ( ) Cut growth rate "'2 dc/dn (10-5mmlcycle) Rebound () Heat built up.6. T (Oe) PS() Specifie gravity (g/cm'') :(.1; BR VCRlNRI CarbonBlaek/(HAF) 1 ProeessOIl =40/60/vanable/2 phr *2 ; de/dn(10-5mmleycle) de = erack growth rate at fixed eycles dn = flexíble eycle,. In rubber industries, it is important that the vulcanizates are evaluated with same hardness or same modulús. Table 4 shows that typical properties of the vulcanizates controlled to have same hardness by carbon black loading. In case of same hardness recipe, L1 T and Rebound are superior to high cis-l,4-polybutadiene rubber, and the specific gravity becomes to be small. UBEPOL VCR contributes to the weight reduction of rubber products and the fuel consumption reduction. 5

7 4. Application of UBEPOL VCR in Rubber [ndustry.tire for Passenger car, Truck-Bus, Construction Vehicle... earticles for sports ; Shoe Sole, Golf ball, Tennis bail... Articles for industry ; Conveyer belt, Hose, Vibration insulator, Cable... r, 6