Expandable ABS resin beads and process for producing the same

Details Expandable ABS resin beads and process for producing the same Expandable ABS resin beads and process for producing the same

1995-09-21

1998-11-17

Foelak, Morton

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

Synthetic resins

Cellular products or processes of preparing a cellular...

4283188, 428407, 521 59, C08G 918

Patent

active

058377409

ABSTRACT:
Expandable ABS resin beads containing a volatile blowing agent are disclosed which have an internal-water content of 5% by weight or lower and, when expanded in an expansion ratio of 30, give expanded beads each having a non-expanded surface layer having a thickness of not more than 50 .mu.m. A process for producing the expandable ABS resin beads is also disclosed which comprises dispersing ABS resin beads into an aqueous medium in a closed vessel and impregnating a volatile blowing agent into the ABS resin beads, said aqueous medium containing an electrolyte at least during the impregnation of the volatile blowing agent, with the concentration of the electrolyte in the aqueous medium being from 0.01 to 2 mol/l. The expandable resin beads are capable of giving an expanded molded article excellent in chemical resistance and toughness and especially in surface appearance and heat resistance.

REFERENCES:
patent: 4812484 (1989-03-01), Endo et al.

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