Polyether-Polyacetal Polyols

Patent Title: POLYETHER-ACETAL POLYOL COMPOSITIONS

 Number/Link:  WO2016/112274

Applicant/Assignee: Dow

Publication date: 14-07-2016

Gist”: Lewis-acid catalysis for polyactal-modified polyethers

Why it is interesting: According to this application, acetal-modified polyether polyols can be prepared by first reacting a (pref.) di- or trifunctional initiator with PO until about 500 eq. wt. using DMC catalysis. This ‘starter’ polyol is then further reacted (at a lower temperature) with PO using a (pref.) Boron-based lewis acid as catalyst, e.g. tris(pentafluorophenyl)borane. Under these conditions part of the epoxy will isomerize to the corresponding aldehyde.  The aldehyde can then co-polymerize such that part of the polyol will be functionalized with polyacetal. Polyurethanes prepared with these polyols are said to show improved modulus and other mechanical properties.

tris(pentafluorophenyl)borane

tris(pentafluorophenyl)borane

TPU from POM-Polyether Polyols

Title: THERMOPLASTIC POLYURETHANES, PRODUCTION AND USE THEREOF

 Number/Link: WO2015/155084  (German)

Applicant/Assignee: Bayer

Publication date: 15-10-2015

Gist”: Paraformaldehyde-PO polyols are used to make TPU

Why it is interesting: Polyoxymethylene (POM) is a highly crystalline ‘engineering thermoplastic’ often used in blends together with TPU. In this invention POM is not blended but used to make a POM-polyether ‘block’ diol which is then used to make TPU. The diol is prepared by using paraformaldehyde as a starter which is reacted with PO (and optionally CO2) using DMC catalysis. The POM-block acts as a ‘hard block’ and use of the diol allows for an improved control of Tg, melt viscosity, hardness, chemical resistance etc. of the TPU.  In the examples TPU is made from a 2000 MW parafomaldehyde/PO-CO2 block copolymer  together with 4,4’MDI and BDO.

Paraformaldehyde

Paraformaldehyde

Fuel Resistant Polyurea

Title: POLYUREA COMPOSITIONS AND METHODS OF USE

 Number/Link: US20140171587

Applicant/Assignee: PRC DESOTO

Publication date: 19-06-2014 (priority PCT)

Gist”: Sulfur-containing polyformal polyols are prepolymerized with aliphatic diisocyanates and then cured with aromatic amines.

Why it is interesting: Sulfur-containing polyformal polyols are prepared from thiodiglycol and paraformaldehyde using acidic catalysis.  The polyols are then reacted with 4,4′-dicylcohexyl diisocyanate (H12MDI) to form a prepolymer which is subsequently cured with an aromatic amine like dimethylthiotoluenediamine. The resulting material is water and fuel resistant and can be used as a sealant in the aerospace industry.

H12MDI-thiodiglycol-polyformal adduct

H12MDI-thiodiglycol-polyformal adduct

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