Release agents external variety

Fatty amides. Fatty amides possess unique mold release properties. Simple primary fatty amides are used as slip and mold release agents primarily in polyolefins but also in a variety of other polymers. The more complex bis-amides, such as ethylene bis-stearamide, offer mold release as well as internal and external lubricity functions in materials such as PVC and ABS. 

There are numerous suppliers of lubricants and mold release agents as a result of the variety of chemistries that perform the function of internal and external lubrication. The suppliers are generally large specialty chemical companies that sell the particular chemistry to a wide variety of end-use applications. The amount of material sold to fimc-tion as a lubricant or mold release agent for plastics is typically small in comparison to each company s total sales. Table 4.19 shows the major global suppliers of lubricants and mold release agents by type. 

There are numerous suppliers of mold release agents as a result of the variety of chemistries that perform the function of internal and external release. The suppliers are generally large specialty chemical companies that see the particular chemistry to a wide variety of end use applications. 

The coccolithophore E. huxleyi releases a variety of thiols into the external medium upon exposure to elevated Cd concentrations [90]. Cys and GSH were the primary thiols released by cells exposed to Cd only, whereas y-Glu-Cys was the primary thiol when Cu and Zn were also present at high concentrations. Like phytochelatins, these low molecular weight thiols released by phytoplankton may also serve as organic metal-complexing agents in surface seawater. 

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