Flexible Foams with Reduced Aldehyde Emissions

Patent Title: POLYURETHANE FOAMS HAVING LOW LEVELS OF ALDEHYDE EMISSIONS

 Number/Link: WO2018/145283

Applicant/Assignee:   Dow

Publication date: 16 August 2018

Gist”: Cyclic 1,3-diketones are used as aldehyde scavengers

Why it is interesting: Aldehyde emissions from flexible polyurethane foams (and many other materials) remain an issue and have been discussed a number of times before in this blog.  The current invention is about the use of cyclic 1,3-diketones as scavengers for both fomaldehyde and acetaldehyde in flexible foam formulations.  Diketones like (e.g.) 5-phenylcyclohexane-1,3-dione, 5,5-dimethylcyclohexane-1,3-dione and 1H-indene-1,3(2H)-dione are blended with the polyol component and react with the aldehydes during foam cure.

DMCHD

5,5-dimethylcyclohexane-1,3-dione