Title: FINE PARTICLE, HIGH CONCENTRATION, POLYISOCYANATE POLYADDITION/POLYURETHANE-UREA POLYOLS

 Numbers/Links: WO2012154831, WO2012154820, WO2012154393

Applicant/Assignee: DOW GLOBAL TECHNOLOGIES LLC

Publication date: all on 15-11-2012

“Gist”: PHD or PIPA polymer polyol by reacting the particle forming raw materials in polyol and in the presence of small non-reactive particles acting as ‘seeds’.

Why it is interesting:  “PIPA”, “PHD” or “SAN” polymer polyols (i.e. polyols containing respectively polyurethane,  polyurea or styrene-acrlynonitrile particles) are used in flexible foams to increase loadbearing and sometimes to improve cellopening.  Dow claims to be able to make PIPA and PHD polyols with small average particles sizes (<100 μm) by using non-reactive ‘seeding’ particles of <10μm.  The resulting polymer polyols have low viscosity at a high solids content.  The seeding particles can e.g. be SAN particles.