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

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Melt-Dispersed Polymer Polyols

Title: PROCESS FOR MAKING A POLYMER POLYOL

 Number/Link: WO2015/165761  (German)

Applicant/Assignee: BASF

Publication date: 5-11-2015

Gist”: Polymer polyols are prepared by melt-dispersing SAN into a carrier polyol using a specific stabilizer

Why it is interesting: Polymer polyols, or ‘graft polyols’, contain finely dispersed polymeric particles and are especially useful for the production of flexible polyurethane foams.  Usually polymer polyols are produced by in-situ polymerization of styrene-acrylonitrile (SAN)- or polyurea particles in a carrier polyol. In this invention, polymer polyols are prepared by dispersing molten SAN into a carrier polyol using shear mixing and a specific stabilizer.  The stabilizer is a (preferably) comb-shaped polyol-SAN copolymer, and is described in another BASF application: WO2015/165878. The polymer polyols are said to have a fine and uniform particle size distribution, a low viscosity and a high stability against segregation.

SAN

SAN

Polyurethane Elastomers containing Polyrotaxanes

Title: CAST-MOLDED HEAT-CURABLE POLYURETHANE ELASTOMER

 Number/Link:  WO2015/159875  (Japanese)

Applicant/Assignee: UBE

Publication date: 22-10-2015

Gist”: 1-10% of a polyrotaxane is incorporated in a hot cast PU elastomer system

Why it is interesting: Polyrotaxanes are molecular systems consisting of a linear polymer which is “threated” through a number of ring-shaped molecules. The rings are prevented from ‘sliding off’ by blocking-molecules at both ends of the “thread”. In this invention polyrotaxanes based on a polycaprolactone thread and cyclodextrin rings (pref.) are incorporated in hot cast elastomer systems in amounts of 1-10% (w/w). Because cyclodextrin rings contain hydroxyl groups they react with the isocyanate incorporating the polyrotaxane in the PU polymer. The systems are said to have processing and property advantages for specific elastomer applications, in this case printer rollers – if I understand the machine translation correctly.

Schematic presentation of a polyrotaxane

Schematic presentation of a polyrotaxane

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