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The melting point of sodium stearate is from 245 to 255 deg C. Sodium stearate is a salt of stearic acid, which is one of the most common saturated fatty acids in nature.

Lithium stearate has a higher melting point. It also acts as a plasticizer. This means that it improves the wettability of the polymer and reduces the processing temperature of the polymer. In addition, it has a lower tendency to bloom out, which means that it has less of a “blooming” effect. Consequently, it can help to increase the pore size of the polymer.

However, calcium stearate has a lower melting point. Calcium stearate tends to snow out of the polymer during the hot extrusion process. As a result, it is less ideal for certain separator products. Consequently, a new alternative is needed for pin removal in these separators.

Various fatty acid metal salts with melting points that are above the hot extrusion temperature can solve the problem. For example, metal fatty acids can be more soluble in water than lithium stearate, thereby making it easier to incorporate the additive into the coating slurry. Another advantage of adding fatty acid metal salts is that they can improve the wettability of the polymer.

Additionally, these fatty acid salts can also be used as lubricants. They can also help to increase the crystallinity of the polymer, thereby shortening cycle times. These properties make them excellent additives for the manufacturing of plastics.

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