Title: PUR FOAM WITH ENLARGED CELL STRUCTURE

 Number/Link: WO2014/170198 (German)

Applicant/Assignee: Evonik

Publication date: 23-10-2014

“Gist”: The cell size of PU flexible foam is enlarged by using microcrystalline wax.

Why it is interesting: Enlarging the cell size of flexible foams can improve comfort properties by enhancing ‘breathabibility’, that is by enhancing airflow and moisture- and heat transport.  According to this invention the cell size of flex foams can be increased without affecting foam density or hardness by using a specific type of wax.  The wax (preferably) is a microcrystalline wax (as opposed to a paraffinic wax) with a congealing temperature of between 60 and 75°C.  The wax is used as a dispersion in a solvent (e.g. a sorbitan ester)  in an amount of about 0.05 to 2.0 php.

Cell structure of a flexible polyurethane foam.