Method of preparing expandable polystyrene

Details Method of preparing expandable polystyrene Method of preparing expandable polystyrene

1980-04-18

1981-11-24

Camby, John J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

432 13, 264 51, 264300, 264DIG9, 521 56, 521 59, 521 60, 521154, C12P 3314, F27B 1400, C04B 3332

Patent

active

043025498

ABSTRACT:
A process for the expansion of an expandable, polymeric, bead material by exposing the bead material to steam at an elevated temperature, to effect the expansion of the bead material into a polymeric bead material form, while tumbling the bead material during expansion to prevent fusion, the improvement which comprises: employing as a lubricant for the bead material a lubricant material which, on exposure to the steam and prior to the end of the expansion of the bead material, is changed in lubricant characteristics, to provide an expanded, polymeric foam bead material having a reduced surface lubricity.

REFERENCES:
patent: 3086885 (1963-04-01), Jahn
patent: 3751218 (1973-08-01), Cherenson
patent: 4017427 (1977-04-01), Granda et al.

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