Monovinylaromatic polymer with improved stress crack resistance

Details Monovinylaromatic polymer with improved stress crack resistance Monovinylaromatic polymer with improved stress crack resistance

1997-03-20

1999-01-19

Mullis, Jeffrey

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

524505, 524848, 524849, 525313, 525314, 525315, 525316, 525244, C08K 501

Patent

active

058614559

ABSTRACT:
The present invention discloses a composition of matter consisting of a high impact polystyrene exhibiting improved environmental stress crack resistance. The HIPS material is formed utilizing polybutadiene, polyisoprene, and copolymers thereof with styrene, having a Mooney viscosity exceeding about 35 and a gel content of up to about 28%. The present invention discloses the use of a combination of lubricant additives to obtain a HIPS material with higher ESCR values than either additive alone could provide, and also discloses the optimum level of each additive.

REFERENCES:
patent: 3506740 (1970-04-01), Dempsey et al.
patent: 3987124 (1976-10-01), Hardwicke et al.

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