Expandable polystyrene with stabilized cell structure

Details Expandable polystyrene with stabilized cell structure Expandable polystyrene with stabilized cell structure

1980-02-01

1981-01-06

Foelak, Morton

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Particulate matter

260 285A, 521 56, 521 60, 521 98, 521132, 521146, 428403, C08J 914, C08J 920

Patent

active

042437172

ABSTRACT:
Incorporating 500 to 5,000, preferably 2,000 to 4,000 parts per million of Fischer-Tropsch wax of high congealing point into beads of expandable polystyrene made by suspension polymerization yields greater advantages, and conditions (time, temperatures, and recipe) of the polymerization become less critical. The drying or conditioning step before the pre-expansion under particular conditions to generate a suitable cell structure need not be followed, and a step of coating with zinc stearate or the like before the pre-expansion may be omitted. Unexpanded beads are obtained which yield consistent cell structure, independent of conditions of their storage. Beads of higher pentane content can be used, and final articles of lower density may be obtained. The throughput of the pre-expander may be increased, and the beads, after pre-expansion, have good free-flowing (reduced clumping) and mold-filling characteristics. Other things being equal, they can be molded with a shorter cycle time, yet exhibit excellent fusion and other desirable characteristics.

REFERENCES:
patent: 2979476 (1961-04-01), Bishop et al.
patent: 3060138 (1962-10-01), Wright
patent: 3224984 (1965-12-01), Roper et al.
patent: 3285865 (1966-11-01), Del Bene et al.
patent: 3320188 (1967-05-01), Dijkema
patent: 3398105 (1968-08-01), Roper et al.
patent: 3520834 (1970-07-01), Mizutani et al.
patent: 3647723 (1972-03-01), Mysik et al.

Affiliated with

Also associated with

Rating

Expandable polystyrene with stabilized cell structure does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Expandable polystyrene with stabilized cell structure, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Expandable polystyrene with stabilized cell structure will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-285489