Polyamide Polymer Polyols

Patent Title: POLYAMIDE DISPERSION IN POLYOL AND PREPARATION THEREOF

 Number/Link: WO2017/216209

Applicant/Assignee:  BASF

Publication date: 21 December 2017

Gist”: Polyamide particles from polyether diamine and adipic acid are dispersed in polyol

Why it is interesting: Conventional polymer polyols contain either SAN-, polyurethane- or polyurea particles (see e.g. here).  According to this invention, polymer polyol dispersions can also be prepared by reacting a diamine, containing at least 50 wt% of a linear polyether having two terminal primary amine groups with a dicarboxylic acid (e.g. adipic acid) in a polyether polyol.  The reaction results in a dispersion of polyamide particles in the polyether polyol, stabilized by the polyether diamine. The polymer polyols are useful for flexible foam production and are said to show an improved hydrolysis resistance.

adipicacid

Adipic acid

Flexible Foams with Enlarged Cell Size

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.

Cell structure of a flexible polyurethane foam.