Syntactic rigid PUR/PIR foam boardstock

Details Syntactic rigid PUR/PIR foam boardstock Syntactic rigid PUR/PIR foam boardstock

1998-09-23

2000-12-26

Yoon, Tae

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

Synthetic resins

Processes of preparing a desired or intentional composition...

523219, 521 54, 521137, 521155, C08J 932, C08L 7504, C08G 1800

Patent

active

061661090

ABSTRACT:
The present invention relates to the use of hollow microspheres filled with a hydrocarbon, to introduce uniform cell geometries in syntactic foams having a bimodal cell structure. The rigid foam product includes from 20 to 80 percent by weight of the hollow microspheres, the microspheres having average diameters ranging from 80 to 200 microns. The microspheres are encapsulated from 80 to 20 percent by weight of a closed cell polyurethane foam, the cells of the foam having average diameters from 0.01 to 60 microns.

REFERENCES:
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patent: 4038238 (1977-07-01), Cravens
patent: 4082702 (1978-04-01), Harper
patent: 4303729 (1981-12-01), Torobin
patent: 4303736 (1981-12-01), Torobin
patent: 4829094 (1989-05-01), Melber et al.
patent: 4843104 (1989-06-01), Melber et al.
patent: 4902722 (1990-02-01), Melber
patent: 4916173 (1990-04-01), Otloski et al.
patent: 4959395 (1990-09-01), Janda
Chemical Abstracts, vol. 118, No. 22, May 31, 1993, Abstract No. 214484.

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