Bioabsorbable Thermoplastic Polyurethane

Patent Title: BIODEGRADABLE AND/OR BIOABSORBABLE THERMOPLASTIC POLYURETHANES

 Number/Link: WO2018/140912

Applicant/Assignee:  Lubrizol

Publication date: 2 august 2018

Gist”: TPU breaks down into non-toxic components

Why it is interesting: The invention is related to biodegradable TPU for medical use in vivo. The TPU is prepared from isocyanates, polyols and chain extenders that biodegrade into non-toxic products, e.g. hexane diisocyanate, butanediisocyanate, lysine diisocyanate, poly(ε-caprolactone), polyglycolide, dipropylene glycol, diethyleneglycol etc.  The TPUs are prepared at a hardblock content of 15-45% (pref).
I strongly doubt that this case is patentable because the same compositions are disclosed inanother Lubrizol application discussed before in this blog.

LDI

Lysine diisocyanate

Free Download: Polyurethane Science Scan Nr.13 – June & July 2018

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cover 13

Polyurethane Oil Gel

Patent Title: OIL GEL, PRESSURE RESISTANT MATERIAL USING SAME FOR PROTECTING ELECTRONIC DEVICES AND OIL GEL-FORMING AGENT

 Number/Link: WO2018135494  (Japanese)

Applicant/Assignee:  Sec Corp.

Publication date: 26 July 2018

Gist”: A gel from a paraffinic  oil and a compatible linear PU is used as a pressure resistant material for deep-sea applications

Why it is interesting: The invention relates to a PU-oil gel that is used as a kind of “potting compound” to protect subsea electronics at “abyssal depths” , i.e. at pressures of 5.6 MPa (about 550m deep). The gel is prepared by reacting a hydrophobic diol and a hydrophobic diisocyanate in the presence of 10-50% (w/w) on the total composition of a paraffinic oil. In the examples an OH-ended, saturated polyisoprene is used as diol together with norbornanediisocyanate.

NBDI

2,5-norbornane diisocyanate

PU Elastomers from SGO Polymerized Acrylic Polyols

Patent Title: PHYSICAL PROPERTY IMPROVEMENT OF POLYURETHANES

 Number/Link: WO2018/132648

Applicant/Assignee:  BASF

Publication date: 19 July 2018

Gist”: Solvent-free acrylate polyols are reacted together with polyether polyols and diisocyanates

Why it is interesting: In this invention a solvent-free (“100% solids” in the patent’s terminology) acrylic polyol is blended with a conventional polyether polyol and reacted with an aliphatic or aromatic diisocyanate.  The acrylic polyol is prepared by co-polymerizing (e.g.)  ethyl- or butyl (meth)acrylates, styrene and a hydroxyl functional acrylate like 2-hydroxyethyl acrylate or 4-hydroxybutyl acrylate, using BASF’s “solid grade oligomer” (SGO) polymerization process. The SGO process is a high temperature and high pressure continuous process allowing for the production of low-solvent acrylic resins. The polyurethanes are said to have increased physical properties, esp. tear- and tensile strength properties.

HBA

Hydroxybutylacrylate

Phosgene-Free Polyisocyanate with PDMS Backbone

Patent Title: MULTI-FUNCTIONAL CARBAMATE HAVING SOFT-SEGMENTS, POLYISOCYANATE OBTAINED VIA SUBSEQUENT NON-PHOSGENE SYNTHESIS METHODS, URETHANE PREPOLYMER AND ELASTOMERIC URETHANE HAVING SOFT-SEGMENTS DERIVED THEREFROM, AND PREPARATION METHOD THEREOF

 Number/Link: US20180186918

Applicant/Assignee:  Great Eastern Resins Industrial

Publication date: 5 July 2018

Gist”: Biscarbamate with PDMS softblock backbone is heat-cracked into diisocyanates

Why it is interesting: The invention relates to isocyanate-capped “softblock” siloxanyl prepared without using phosgene and polyurethanes derived therefrom. The invention is accomplished by reacting relatively high MW polydimethylsiloxanediamines with diphenylcarbonate.  The resulting biscarbamate is heated under reduced pressure to produce the diisocyanate and to remove the phenol by-product.  The isocyanates can be reacted with polyols and/or chain extenders to produce highly hydrophobic polyurethanes with low surface tension and good chemical resistance.

biscarbamate

Biscarbamate with PDMS backbone