Carboxylated SBR latex

The largest-volume synthetic rubber consumed is styrene-butadiene rubber (SBR). In 2003, SBR solid rubber accounted for 41 percent of all synthetic rubber. If SBR latex and carboxylated SBR latex are included, its share increases to 55 percent. The major application of solid SBR is in the automotive and tire industry, accounting for approximately 70 percent of the use. Therefore, SBR has been tightly tied to the tire business.25... 

Non-discoloring, sulfur containing phenolic antioxidant and stabilizer that provides long-term heat stability by preventing thermo-oxidative degradation. Used for the process stabilization of polyethylene wire and cable resins for polyethylene during extruder compounding. Can also be applied in styrenic polymers, polypropylene, elastomers such as EPDM and SBR and for carboxylated SBR latex, polybutadiene rubber and polyisopropene rubber. 

Uses Crosslinking agent for carboxylated SBR latex, carbor methyl cellulose, PVA, and other water-sol. polymers water resist, aid for starch-based adhesives and coalings food-contact paper/paperboard Regulatory FDA 21 CFR 176.170,176.180 Properties Pale amber liq. water-soL sp.gr. 1.03 vise. 50 cps f.p. -3.9 C pH 4.7 cationic 12.5% total solids Storage 100 days shelf life below 32 C Polycup 1884 [Hercules]... 

The next series (Figs. 8-10) show the types of properties obtained with two different carboxylated SBR latexes tackified with the same ion-tolerant emulsion of the glycerol ester of highly hydrogenated rosin. Fig. 8 shows the property of probe tack. Both of the carboxylated latexes exhibit some inherent tack properties, but the probe tack is improved even further with increasing levels of the resin. The extent to which the tack is improved is dramatically different depending on which latex is used. Pig. 9 demonstrates the differences even further. Resin modification of Latex B which is the lower molecular weight polymer. 

Fig. 8. Polyken Tack of Various Carboxylated SBR Latexes Tackified with an Emulsion of the Glycerol Ester of Highly Hydrogenated Rosin...

In Figure 11, dynamic mechanical properties of three carboxylated SBR latexes are shown. These three latexes show different tan 8 peak maximum temperatures and elastic... 

BNX 1035 is a particularly effective 2Uitioxidant for polyethylene, styrenic polymers, polypropylene and elastomers such as EPDM euid SBR auid for carboxylated SBR latex, polybutadiene rubber and polyisoprene rubber. 

Paper Coatings. Carboxylated SBR latexes are also important either alone or in combination with other material such as starch or casein as an adhesive or binder for clay coatings for printing papers. 

Finally, carpet backing applications use carboxylated SBR latexes with contents in styrene in the 60-70 wt.% range. Hie carboxylic acid monomers vary from company to company and... 

---