Additives for molding compounds composed of unsaturated polyester : Anti-separation additives

Anti-separation additives
Additives for molding compounds composed of unsaturated polyester

Authors : Marie-Laure GUILHEM, Gerard REESTMAN

Publication date: October 10, 2011 | Lire en français

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2. Anti-separation additives

To improve the surface quality and dimensional stability of a molded part, additives are used to control shrinkage. Anti-separation additives improve resin homogeneity and maintain the stability of the filled system.

2.1 Nature and principle of action of anti-separation agents

For example, PS (polystyrene) and PMMA (polymethyl methacrylate) are not stable when mixed with unsaturated polyester resin (UP). These polymeric molecules have properties similar to those of resins, thanks to their relatively higher molecular weight (> 25,000) than conventional low-molecular-weight polymers (< 10,000). What's more, these newer additives contain a relatively higher number of adhesion sites. The structure of such additives...

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Anti-separation additives