Patent Literature on sPS Blends

To overcome the main drawbacks of sPS (e.g. poor impact resistance) without impairing the other thermo-mechanical properties (e.g. modulus, heat distortion temperature) and solvent resistance, extensive research has been carried out by blending and compounding it with suitable polymeric and inorganic components. Several patents have been issued on polymer blends having sPS as a main component. Table 20.1 reports the most relevant of them published by the US Patent Office in the period 1985-2000. 

Generally, the impact resistance of a polymeric material can be improved by blending with elastomers or other resilient polymers. However, owing to the poor miscibility often occurring among blend constituents, a suitable compati-bilizer must be added to the formulation. 

Claimed blend composition Example of component(s) US Patent No. Assignee 

1 (a) 95-50% sPS (b) 5-50% poly(phenylene ether) (b) Poly[(2,6-dimethyl)-l,4-phenylene ether] 4946897 Montedipe/ 

---