Elastomers Santoprene

Thermoplastic Advanced Elastomer Santoprene, Geolast, Vyram,... 

Major suppliers of TPOs include Advanced Elastomer (Santoprene), Advanced Polymer Alloys (Alcryn), Du Pont Dow Elastomers LLC Engage, Affinity), Nova Polymers (Novalast), Montell (HiFax), Solvay Engineering Polymers Deffiex), and Teknor Apex (Uniprene, Telcar). 

Recently developed thermoplastic rubbers (e.g., Santoprene developed by Monsanto) are taking over some of the market niches, which were formerly reserved for vulcanized (cross-linked) rubbers [34]. Not only does this material lend itself to convenient processing like a thermoplastic, but once an item made from a thermoplastic rubber has outlived its usefulness it can be much more readily reprocessed. However, thermoplastic elastomers generally have lower strength, less abrasion resistance, and lower tolerance to high temperatures than vulcanized rubber so these materials will only encroach on conventional rubber applications in areas where these properties are less important. 

Santoprene . [Advanced Elastomer Systems] Thenntqrlastic rubber. 

EPDM/PP Advanced Elastomer Systems Santoprene Dynamic Vulcanization Amorphous/ Amorphous... 

Nitrile rubber/PVC blends have reached a mature stage in their commercial usage. They face increasing competition from other thermoplastic elastomers such as the dynamically vulcanized blends of PP/EPDM and PP/NBR (Santoprene and Geolast , Monsanto-Advanced Elastomer Systems). 

Commercially important elastomeric thermoplastic alloys are dynamically vulcanized blends of polypropylene with high volume fractions of EPDM, polybutadiene rubber, nitrile rubber, and butyl rubber (Santoprene , Vyram , Geolast and Trefsin ) all currently sold by Advanced Elastomer Systems, a joint venture of Monsanto and Exxon. Another recent member of the commercial dynamically cured elastomeric thermoplastic alloys is the blend of PVC and a crosslinked ethylene copolymer (Alcryn , DuPont). The current consumption of all the elastomeric thermoplastic alloys in the USA is over 23 kton/y, with the EPDM/PP blend (Santoprene ) assuming about 90% of the market share. 

Increasing the crosslink density of the elastomer dispersion results in improvements of the strength and tension set of the blend. The difference between the earlier commercial grades of partially cured EPDM/PP blends (TPR, Uniroyal) and the more recent commercial grades of completely cured EPDM/PP blend is in the improved elastomeric properties, viz. reduced compression and tension set and improved flexural fatigue. More important, the chemical resistance and resistance to oil swelhng is improved. Typical properties of commercial dynamically vulcanized EPDM/PP blend (Santoprene ) are shown in Table 15.13. 

Although the dynamically vulcanized blends such as EPDM/PP (Santoprene ) and NBR/PP (Geolast ) have sometimes been referred in the literature as semi-IPNs, we considered them as blends of crosslinked elastomer dispersions in a thermoplastic matrix and as such treated them under the elastomer blends. There is yet another class of thermoplastic/thermoset blend system in which a minor amount of the crosslinkable monomer(s) is allowed to polymerize in the thermoplastic matrix forming a loose network. 

Figure 11 rEntrance pressure drop versus shear rate for Santoprene thermoplastic elastomers at 204°C... 

Commercial IPNs have been developed to combine useful properties of two or more polymer systems. For example, high levels of silicone have been combined with the thermoplastic elastomer (TPE) based on Shells Kraton styrene-ethylene/butadiene-styrene TPE and Monsantos Santoprene olefin TPE. These IPN TPEs are said to provide the biocompatibility and release properties of silicone with tear and tensile strength up to five times greater than medical-grade silicone. Thermal and electronic properties and elastic recovery are also improved. 

The EP thermoplastic elastomers are distinguished from the crossUnked analogues, which are not thermoplastics since reforming is impossible. A very important thermoplastic elastomer is comprised of a blend of an EP copolymer with an ethylene-propylene-diene (EPDM) terpolymer. This latter material is, of course, a crosslinkable thermoset however, these materials can be processed as thermoplastics if the crosslinkable component is present at low enough concentration to be present as an isolated phase. Melt-processing causes the formation of chemical bonds within the isolated rubber phase, a process called dynamic vulcanization. A commercial example of this type of material is Santoprene [4] manufactured by Advanced Elastomer Systems. Other blends of noncrosslinkable TPEs with crosslinkable materials are used commercially. These materials are classified as elastomer blends and are the subject of Chapter 12. 

Thermoplastic vulcanizates are a separate class of thermoplastic elastomers (TPEs) with Santoprene as the representative biomedical elastomer. 

Figure 8.26 Tensile stress vs. strain for ExxonMobil Santoprene 55 Shore A grades of TPO elastomers (per ASTM D 412) [6].

Santoprene rubber physical properties guide. Advanced Elastomer Systems 2005. 

Thermoplastic Vulcanizate (TPV). TPVs are generally classified as f-TPV and p-TPV, wherein the prefixes indicate fully and partially vulcanized, respectively. Compounds of f-TPVs are typically made with EPDM and PP. In few special TPV compounds, EPDM is replaced by nitrile rubber, and natural rubber as well. The industry benchmark is TPV compounds, and they are sold under the trade name of Santoprene and marketed by Advanced Elastomer Systems (AES) Ltd. Mitsui is also dominant in the TPV based interior skins market in Europe. Seventy-five to 90 percent of TPV compounds are fully cross-linked with EPDM and are priced at approximately 1.80/lb. Two to 10 percent are par-... 

C.P. Rader, J. R. Richwine, E. P. Tam, G. E. O Connor, Santoprene thermoplastic elastomer processability and product applications. International rubber and plastic exhibition and conference for Asia, Singapore, 1986 A. Seeffied, M. Fuchs, D. Drummer, Plast. Eng. 68(10), 14 (2012)... 

Santoprene Polypropylene/EPDM or EPM, dynamically vulcanized thermoplastic elastomers, TPO Monsanto Chem. Co. 

Advanced Elastomer Systems Santoprene thermoplastic vulcanizate is composed of polypropylene and finely dispersed, highly vulcanized EPDM rubber. Geolast t TPV is composed of polypropylene and nitrile rubber, and the company s Trefsin is a dynamically vulcanized composition of polypropylene plus butyl rubber. 

Santoprene is a registered trademark of Advanced Elastomer Systems LP. fGeolast is a registered trademark of Advanced Elastomer Inc. Systems LP. tTrefsin is a registered trademark of Advanced Elastomer Systems IP. 

Santoprene Rubber Physical Properties Guide, Advanced Elastomer Systems LP, Akron, Ohio, ca. 1998. 

Thermoplastic vulcanizates (TPVs) are composed of a vulcanized rabber component, such as EPDM, nitrile rubber, and butyl rubber in a thermoplastic olelinic matrix. TPVs have a continuous thermoplastic phase and a discontinuous vulcanized rubber phase. The most common TPV polymer systan is PP/EPDM rubber however, a number of other polymer systems have been commercially developed. These include PP/NBR, PP/butyl and PP/halobutyl, PP/NR, and PP/EVA/EPDM. Producers include Advanced Elastomers Systems (Santoprene, Geolast, and Trefsin). The highly rubberlike properties of TPV have enabled than to perform as engineered thermoplastic rubbers. In numerous application areas they have directly replaced premium-performance thermoset rubber compounds. Prominent among these are dananding automotive applications, electrical insulation and connectors, compression seals, appliance parts, medical devices, and food and beverage contact applications. 

Santonox, Antioxidant, Rexsys America LP Santoprene, Polypropylene EPDM-based vul-canizate. Advanced Elastomer Systems LP Santowhite, Antioxidant, Rexsys America LP Saran, Barrier resins, Dow Plastics Saran Films, Plastic films, Dow Plastics Saranex, Coextruded film, Dow Plastics Saret, Crosslinking agents, Sartomer Co. Inc. Sarlink, Dynamically vulcanized thermoplastic elastomers, DSM Thermoplastic Elastomers Inc. 

Dynamically vulcanized blends ([3, 4] see also the chapter on Thermoplastic dynamic vulcanizates in this book) are produced by melt mixing an elastomer phase with a thermoplastic (the elastomer being the major component) and then curing the elastomer during melt mixing. The resulting blend comprises the thermoplastic resin hlled with high concentration of rubber particles well bonded to the matrix. These blends are usually PP/EPDM (Santoprene ) or PP/polybutadiene (PB), but ex-... 

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