Low Gloss Types

Low gloss types are fabricated from bulk polymerization, since low gloss can be effected by a larger particle size of the polymer. 

Compositions of the ABS type may be mixed with other polymers. Suitable blend partners can be selected from poly(carbonate)s (PC)s, poly(ester)s, poly(ester carbonate)s and poly(amide)s (PA)s. Some especially preferred types, of these compounds and an overview of how to produced these types have been described (16). 

Actually, ABS can be considered as an impact modifier for PC. PC/ABS blends have been compatibilized with both maleic anhydride (MA)-grafted poly(propylene) (PP) and a solid epoxy resin of the bisphenol A type. Both compatibilizers are effective for formulations of an ABS content up to 30%. The the impact strength of the compatibilized blends was close to that of PC. However, above 40% ABS content, the impact strength decreases significantly (19). 

Polymer mixtures of aromatic PC, ABS graft polymer and styrene-containing copolymers and monophosphates are described as flameproofing additives (20). It has been claimed that phosphonate amines are superior flame retardants for PC/ABS molding compositions (21). 

To improve the long-term service life of PC/ABS composites, in particular when used at elevated temperature and ambient humidity, it is desirable to improve the hydrolysis resistance of these materials (22). The addition of very finely divided calcium carbonates with an average particle diameter of less than 100 nm greatly increases hydrolysis resistance without impairing the toughness of the blend. 

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