TPU Nanocomposite

Patent Title: POLYURETHANE COMPOSITE

 Number/Link: WO2018/185650 (Spanish)

Applicant/Assignee: UNIVERSIDAD DE ANTIOQUIA

Publication date: 11 October 2018

Gist”: Protein-stabilized nano- calciumcarbonate particles are incorporated into a thermoplastic polyurethane composition

Why it is interesting: Calciumcarbonate nanoparticles are prepared by mixing a solution of sodium carbonate, sodium caseinate and calciumchloride in a high pressure homogenizer. Particles are formed of CaCO3 embedded in a protein matrix that stabilizes that particles against aggregation. Particle size is (pref) 150-300nm with primary CaCO3 particles of 5-10nm. The particles are used in an amount of (pref) 0.6-1% (w/w) on a TPU composition. The TPUs are said to show increased mechanical properties and improved cell growth and are said to be useful for biomedical applications.

nanoparticle

Stabilized nanoparticles (Wikipedia)

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

TPUs from Block Polyester Polyols

Patent Title: THERMOPLASTIC POLYURETHANE HAVING HIGH TEAR PROPAGATION STRENGTH  & PROCESS FOR PRODUCING TRANSPARENT HARD THERMOPLASTIC POLYURETHANES

 Number/Link: WO2018/115460  WO2018/115464

Applicant/Assignee:  BASF

Publication date: 28 June 2018

Gist”:  Polyester polyols containing a “hard block” of polyethyleneterephthalate are used in the preparation of TPU 

Why it is interesting: According to this invention thermoplastic polyurethanes with a high hardness at a relatively low hardblock level (<75%), or a high tear strength at relatively low Tg (<5°C) can be prepared from a polyester polyol that is a block copolymer containing 10-50% of an aromatic polyester block, the rest being aliphatic polyester. In the examples diols are prepared from PET together with adipic acid and BDO or DEG. The diols are reacted with MDI or HDI and a chain extender like BDO or HDO.

PET

Poly(ethyeleneterephthalate)

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