Free Download: Polyurethane Science Scan Nr. 9 – December 2017

You can now download the 9th issue (December) of my monthly PU Science Scan for FREE from my webshop at http://sellfy.com/GeertBleys.

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Sequence-Defined Polyurethanes for Information Storage

Patent Title: UNIFORM SEQUENCE-DEFINED POLYURETHANES AND USES THEREOF AS MOLECULAR LABELS

 Number/Link: WO2017/194694

Applicant/Assignee:  Centre National de la Recherche

Publication date: 16 November 2017

Gist”: Stepwise immobilized polymer synthesis is used to make polyurethane having a predefined sequence of monomers

Why it is interesting: The invention is about monodisperse polyurethanes consisting of a well-defined sequence of monomers having various chain lengths and side groups – not unlike proteins or nucleic acids. In a first step a solid support (e.g. polystyrene beads) which bears a cleavable tether molecule is reacted with N,N’-disuccinimidylcarbonate and in a second step with an aminoalcohol like 5-amino-1-pentanol. Steps 1 and 2 are then repeated using the same or a different aminoalcohol. Finally the tether is cleaved from the support.  If 2 different aminoalcohols are used, a binary code can be encoded in the molecule which can later be read using a sequencing technique. The polyurethanes are said to be useful in anti-counterfeiting technologies.

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Reaction sequence according to the invention

Natural Oil Polyols using Self-Metathesis

Patent Title: POLYOLS FORMED FROM SELF-METATHESIZED NATURAL OILS AND THEIR USE IN MAKING POLYURETHANE FOAMS

 Number/Link: US2017/0291983

Applicant/Assignee:  Trent Univ.

Publication date: 12 october 2017

Gist”: NOPs from self-metathesized soy oils

Why it is interesting: The use of metathesis chemistry to modify natural oils before converting them to polyols has been discussed before in this blog:  see e.g. US2015/0337073, to the same applicant, which relates to cross-metathesis of natural oils using (e.g.) 1-butene. The current case is about self-metathesis of unsaturated natural oils, resulting in ‘metathesis oligomers’ which are then (partially) epoxidated and hydroxylated to prepare the polyols. In the examples soybean oil is turned into polyols with OH values between about 100 and 250, which are used to make flexible foams with densities of more than 150 kg/m³.

Oligomer from self-metathesis of unsaturated triglycerid


Functionalized Polymer Polyols

Title: COPOLYMER POLYOL WITH FUNCTIONAL ADDITIVE IN DISPERSED PHASE

 Number/Link: WO2017/053064

Applicant/Assignee: Dow

Publication date: 30-mar-2017

Gist”: Polymer polyols are prepared by melt-dispersion of functionalized polystyrene in a carier polyol.

Why it is interesting: The preparation of polymer polyols by melt-dispersion is known and has been discussed before in this blog. According to this invention the thermoplastic to be dispersed is first pre-compounded with one or more ‘functional components’, like pigments, flame ratardants, high density fillers, etc. In the examples polystyrene is compounded with additives like TiO2 and flame retardants in a twin-screw extruder combined with a pelletizer. The molten pellets are then dispersed under shear in a polyether polyol together with a stabilizer.  The stabilizer is a copolymer prepared from an unsaturated branched polyol and styrene.
The polymer polyols are useful for the production of PU flexible foams and elastomers.

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SEM image of polymer polyol according to the invention

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