Title: METHOD FOR PRODUCING RIGID POLYURETHANE FOAMS
Number/Link: WO2013/024101 (German)
Applicant/Assignee: BASF
Publication date: 21-02-2013
“Gist”: Polymer polyols comprising surface-active and reactive SAN particles for improved rigid foams.
Why it is interesting: In this invention polymer polyols are prepared by in-situ co-polymerisation of styrene, acrylonitrile (preferred) and a polyether siloxane surfactant comprising at least one unsaturated group and at least one hydroxyl group. This will result in a polymer polyol (or “graft polyol”) comprising surface-modified particles, which, when used to prepare rigid foams, will end up predominantly (>50%) in the cell walls rather than in the cell struts. This is new and surprising. The rigid foams should show improved insulation properties and compressive strength.
surface active monomer used in the invention
Innovation in Polyurethanes 
July Wang
/ March 19, 2013We are manufacturer and supply crystalline II type ammonium polyphosphate.It’s a kind of flame retardant, mainly used in fireproof materials. Quality and Price are very competitive.if possible, shall I know the email of purchase department.
If you are interested, feel free to contact me.