Patented blends with added compatibilizer

Patented or commercial polymer blends are in most cases multiphase, compatibilized systems. In the old, but still popular blends of polyvinyl- 

ABS/PMMA 5-25 wt% EO-CHR epihalohydrin copolymer ESD, reduced delamination and improved ductility Gaggar et al.., 1988 

PP and/or LLDPE EPR enhanced mechanical performance Yamazaki and Eujimaki, 1970,1972 

PCO/PE Block copolymers with Ethylene or Propylene and norborene blocks low melt viscosity thus good processability, high elongation at break, impact strength, toughness, hardness, and modulus Epple and Brekner, 1994 

PE/PPE Styrenic copolymers (SB, SBS, SEBS) had excellent impact strength, good solvent resistance and aging characteristics Haff and Lee 1978 

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Itoh et al. [141] patented a blend of polyurethane and silicone gum with vinyl groups. The crosslinking reaction of the silicone component was achieved using a radical generator. Chorvath et al. [142] also patented a system composed of polyamide or polyester as the thermoplastic and vinyl-containing polysiloxane cured by a peroxide or non-peroxidic initiator such as 3,4-dimethyl-3,4-diphenylhexane (HTV). Moreover, they added different compatibilizers such as amino-terminated or amino-grafted polysiloxane, epoxy- or isocyanato-functionalized polysiloxane. 

At present, there is only one commercial source of the polyamide/polycarbonate blends (Dexcarb , Dexter Corp.). According to their patent, the blend was compatibilized by using a combination of a polyesteramide elastomer and a maleated olefinic polymer, such as male-ated polypropylene or EP rubber [Perron, 1984 1988]. However the degree or the efficiency of compatibilization achieved is unknown, since the added components are not known to be miscible or compatible with the polycarbonate. Nevertheless, the data sheet indicated good properties including a high notched Izod impact strength of > 700 J/m (Table 15.24). 

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