Styrene Isoprene Block Polymer Thermoplastic SIS Elastomer
Physical Properties
Thermoplastic SIS Elastomer is a transparent linear triblock copolymer based on styrene and isoprene used as an ingredient in formulating adhesives, sealants and coatings. Styrene Isoprene Styrene can also be used as a modifier for asphalt and polymers.
Thermoplastic Elastomer is a clear, linear triblock copolymer based on styrene and isoprene, with apolystyrene content of 16%. Thermoplastic Elastomer is used as an ingredient in formulating adhesives, sealantsand coatings. It also can be used as a modifier of thermoplastics and in compound formulations.
Specifications
|
Test Item |
Target Values (Spec. Limits) |
||
|
Type |
SIS 8152 |
SIS 8161 |
SIS 8291 |
|
Polystyrene Content (Wt%) |
14-18 |
14-18 |
27-31 |
|
Diblock Content (Wt%) |
14.5-18.5 |
47.0-53.0 |
- |
|
Melt Flow rate (g/10min) |
8.0-14.0 |
8.0-14.0 |
8-14 |
|
Color |
≤6.0 |
≤6.0 |
≤6.0 |
|
Tensile Strength (Mpa) |
≥10 |
≥4 |
≥11 |
|
Elongation at break (%) |
≥1050 |
≥1100 |
≥750 |
|
Volatile Matter (Wt%) |
≤0.7 |
≤0.7 |
≤0.7 |
|
Ash (Wt%) |
≤0.2 |
≤0.2 |
≤0.2 |
|
Application |
a) Adhesives b) Pressure sensitive adhesives c) Sealants d) Coatings e) Modifiers of bitumen and polymers |
a) Pressure sensitive adhesives b) Sealants c) Coatings d) Modifiers |
a) Adhesives b) modifier of thermoplastic |
Typical Value
| Test Items | Unit | SIS 8152 |
SIS 8161 | SIS 8291 |
| Polystyrene Content | Wt% | 16 | 16 | 29 |
| Diblock Content | Wt% | 17.1 | 50 | - |
| Melt Flow Rate | g/10min | 10.44 | 11.36 | 10.22 |
| Color | YI | 1 | 1 | 1 |
| Hardness | Shore A | 35 | 25 | 63 |
| Tensile Strength | MPa | 20 | 8.5 | 28.9 |
| Elongation at Break | ％ | 1187 | - | 969 |
| Solution Viscosity | mPa·s | 1115 | - | 317 |
| Volatile Matter | Wt% | 0.37 | 0.46 | 0.39 |
| Ash | Wt% | 0.08 | 0.08 | 0.08 |
| Mn (SIS) | g/mol | 115000 | 135000 | - |
| Mn (SI) |
g/mol |
71000 | 78000 | 79000 |
| Pd | - | 1.01 | 1.01 |
1.02 |
Application
Hot Melt Pressure Sensitive Adhesive SIS
The Styrene Isoprene block Polymer is a linear triblock polymer containing approximately 18% styrene. SIS is mainly used in the preparation of pressure sensitive adhesives, covering medical, electrical insulation, packaging, signage and other fields, especially in the preparation of hot melt adhesives used as tapes and labels.
The application results show that SIS meets the requirements of HMPSA raw materials; at the same time, SIS plays a toughening role in SBS/SISblend materials, improves processing performance, increases relative elongation of materials, and reduces hardness of materials. After adding SIS to SBS, the anti-aging performance of the product is significantly improved.
Thermoplastic Elastomer SIS for High Flow Adhesives
A Thermoplastic elastomer is a linear block copolymer containing a certain diblock structure. Using a special synthesis process, the distribution range is wide, and the proportion of diblock in the polymer can be effectively adjusted according to the design requirements. This structure imparts high cohesive strength and high adhesive strength to the SIS, as well as good compatibility with a variety of tackifiers. The pressure-sensitive adhesive prepared with the polymer has the characteristics of high initial viscosity, good adhesion and high peel strength. The solution viscosity of SIS in 25% toluene is low, and it has the characteristics of easy spraying and coating, and is more suitable for pressure sensitive adhesives and hot melt adhesives.
| Application | Base Polymer Main Content |
| Masking/Packaging Tape | NR SIS SBS |
| Pressure Sensitive Adhesive | NR SIS SBS |
| Rubber Compounding | NR BR SBR |
| Solvent PSA | NR, SIS, SBS |
| HMPSA | NR, SIS, SBS |
| Non-Woven | SBS, SIS, SEBS |
| PSA | SBS, SIS, SEBS |
USA - Food and Drug Administration (FDA)
When used unmodified for food contact applications the styrene-isoprene block copolymerproduct(s) listed in the table above will comply with the U.S. Food, Drug, and Cosmetic Act asamended under Food Additive Regulation 21 CFR 177.1810 (b)(2) with the following limitations:In addition, the styrene-isoprene block copolymer product(s) listed in the table above will alsocomply with the following:
21 CFR 175.105: Adhesives
21 CFR 177.2600: Rubber articles intended for repeated use
21 CFR 175.125: Pressure sensitive adhesives
21 CFR 175.300: Resinous and polymeric coatings
21 CFR 176.170: Components of paper and paperboard in contact with aqueous andfatty foods
21 CFR 176.180: Components of paper and paperboard in contact with dry food
21 CFR 175.320: Resinous and Polymeric Coating for Polyolefin Films
21 CFR 177.1210: Closures with Sealing Gaskets for Food Containers
Other regulatory information is available on request.
