Flexible Foams from Renewable Polyester Polyols


 Number/Link: WO2014/064130

Applicant/Assignee: Bayer

Publication date: 1-05-2014

Gist”: Flexible foams can be prepared from polyester polyols based on two different diacids and with a limited ester group content.

Why it is interesting: According to this invention flexible foams can be based on polyester polyols only if the polyols are not too polar or too ‘symmetrical’. This is achieved by preparing the polyols from at least two diacids chosen from (preferably) succinic-, adipic-, azeleic- or sebacic acid,  together with (e.g.) diethylene grlycol and some trimethylolpropane. Both the acids and the alcohols are preferably bio-based. The polyester polyols have an OH value of about 60 and an ester group content (polarity) of less than 9.8 mol/kg.  In comparative examples flexible foams based on polyester polyols containing only one diacid showed collapse.

Sebacic Acid

Sebacic Acid

Leave a comment


  1. Hi Martyn!

    you are of course right: these polyester polyols are nothing new but the claims are about flexible foam made with these polyols, and as you know the published “art” on polyester-based flex foam is relatively thin. Also they claim a very specific amount of polyester groups : 9.80 moles/kg, which means that 9.9 is probably known. My guess is that this may be “new” (strictly speaking) but not inventive.

    best regards

  2. Martyn \(CSL\)

     /  May 6, 2014

    Hello Geert :

    How on earth can a patent like this get past the first hurdle…state of the art…polyesters based on AGS acids with a bit of added TMP have been known for ever; the fact that they are bio-based is irrelevant !!

    Best regards



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