Thermoplastic composition containing polymeric anti-static salt, method of making, and use thereof

Abstract

Compositions exhibiting water resistant anti-static properties prepared from a thermoplastic polymer and a polymeric anti-static salt is disclosed.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 60 / 533,173 (filed December 30, 2003). technical field [0003] This invention relates to thermoplastic compositions containing polymeric antistatic salts, especially transparent compositions containing polymeric antistatic salts. Background technique [0004] Most polymers or polymer blends are non-conductive. Thus, when the polymer is processed and used, a static charge builds up. Charged polymer moldings can attract small particles of dust and thus prevent a smooth surface appearance. Particles attracted to the surface of the molded article may also cause a decrease in the clarity of the article. In addition, electrostatic charges can seriously interfere with the production process of such polymers. [0005] Antistatic agents are small molecular materials that can be added to polymers to reduce their propensity to develop static charges, or to f...

AI Technical Summary

Problems solved by technology

However, anionic surface-active additives are difficult to use when used as internal-applied antistatic agents because they are poor in compatibility and uniform dispersion and tend to decompose or deteriorate when heated

Cationic surfactants contain quarternary nitrogen in their molecules. On the other hand, although amphoteric surfactants have good antistatic properties, they can only be used in limited cases because of their extremely poor heat resistance

As for non-ionic surfactant additives, they are more compatible with polymer materials, but tend to be weaker in antistatic properties, and their effects disappear over time at normal or high temperature

Furthermore, because of the limited thermal stability of these nonionic surface-active antistatic agents, their use with engineering thermoplastic resins such as aromatic polycarbonates is also limited because of the temperatures at which such resins are processed

Therefore, such surface-active additives adversely affect the optical properties of aromatic polycarbonates

[0007] Although organic sulfonic acid metal salts have been reported, especially as internally applied antistatic agents for polycarbonate and polyester resins molded at high temperatures, not only are they not sufficiently compatible with the resins, but their heat resistance is also insufficient.

A negative consequence of insufficient compatibility is the loss of transparency properties of certain polymeric materials due to such antistatic agents

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