Patent Number: 6,166,109

Title: Syntactic rigid PUR/PIR foam boardstock

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.

Inventors: Spitler; Kieth G. (Burgettstown, PA), Nicola; William J. (Burgettstown, PA), Holsinger; Carl E. (Freedon, PA)

Assignee: Bayer Corporation

International Classification: C08J 9/14 (20060101); C08J 9/32 (20060101); C08J 9/00 (20060101); C08K 7/00 (20060101); C08K 7/22 (20060101); C08J 009/32 (); C08L 075/04 (); C08G 018/00 ()

Expiration Date: 12/26/2017