Method of manufacturing fire retardant polystyrene insulating bo

Details Method of manufacturing fire retardant polystyrene insulating bo Method of manufacturing fire retardant polystyrene insulating bo

Filed on

1988-03-28

Date issued

1992-07-07

Examiner

Thurlow, Jeffery

Patent Class

Plastic and nonmetallic article shaping or treating: processes

SubClass

Carbonizing to form article

SubSubClass

Agglomeration or accretion

Other Related Categories

264 453, 264 465, 264 51, 264101, 264109, 264DIG2, 264DIG7, B29C 3512

Type

Patent

Status

active

Patent number

RE0339865

Description

ABSTRACT:
Fire retardant polystyrene insulating material is manufactured from expandable polystyrene beads in admixture with a phenol-formaldehyde or melamine-for-maldehyde resin in resole form, the resin containing a blowing agent and a surfactant. The insulating material is formed from the bead-resin mix by applying dielectric heating to foam the resin, expand the beads, and cure the foamed resin to a closed cell structure.

REFERENCES:
patent: 2958905 (1960-11-01), Newberg et al.
patent: 3251916 (1966-05-01), Newnham et al.
patent: 3345442 (1967-10-01), Oxel
patent: 3577363 (1971-05-01), Klug
patent: 3640787 (1972-02-01), Heller
patent: 3661810 (1972-05-01), Gahmig
patent: 4079170 (1978-03-01), Cluff
patent: 4243717 (1981-01-01), Gahmig
patent: 4256803 (1981-03-01), Savey et al.
patent: 4369227 (1983-01-01), Hahn et al.

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