公开(公告)号：US20220411567A1

公开(公告)日：2022-12-29

申请号：US17775249

申请日：2020-11-05

Applicant: STEPAN COMPANY

Inventor： Carl William LISKEY ,  Warren A. KAPLAN ,  Daniel YOCIUS

IPC: C08G18/60 ,  C08G18/76 ,  C08G18/32 ,  C08G18/65 ,  C08K5/521 ,  C08J9/12 ,  C08J9/14 ,  C08J9/00

Abstract: Rigid polyurethane or polyisocyanurate foams, polyester polyols used to produce them, and methods for formulating the foams are disclosed. The foams comprise a reaction product of a polyisocyanate, a polyester polyol, water, a surfactant, a catalyst and optional ingredients. The polyester polyols comprise a phthalimide-containing polyacid, a phthalimide-containing polyol, or a combination thereof. Rigid foams produced from the polyester polyols exhibit higher thermal stability and/or greater intumescence when compared with foams made from other polyester polyols. The phthalimide-containing polyester polyols should allow formulators to improve the flammability performance of rigid foams with reduced levels of flame retardants and/or lower index and should facilitate the production of thinner insulation panels.