Polyurethane-Graphene Composite

Patent Title: POLYURETHANE FILM COMPRISING GRAPHENE AND PREPARATION PROCESS THEREOF.

 Number/Link: WO/2018/202747

Applicant/Assignee:  Directa Plus

Publication date: 8 November 2018

Gist”: A PU film containing graphene nano-platelets

Why it is interesting: The invention is about polyurethane-graphene nanocomposites useful as films in textiles for clothing and medical applications. The films are prepared by incorporating into a (commercially available) PU resin, 1-30% (w/w) of graphene nano platelets together with 0.1-5% of (pref.) silica particles as a blocking agent and a solvent to adjust viscosity.  The composition is cured on a flat support as a film of 10 to 100µm thick. It is said that the PU films can a.o. have improved breathability, thermal conductivity, electrical conductivity and antibacterial activity.

Graphene

Graphene (Wikipedia)

 

 

PU Elastomers with Extremely High Elongation

Patent Title:  Polyurethane Elastomer with High Ultimate Elongation

 Number/Link: US2018/0312623

Applicant/Assignee:  UNIV PENNSYLVANIA

Publication date: 1 November 2018

Gist”: Low hardblock polyurethane-polyurea elastomers are prepared from low unsat diols, HDI and a bulky diamine chain extender

Why it is interesting: The current invention relates to PU  elastomers which are said “to  have the highest reported elongation-at-break among known polyurethane elastomers“. The materials are prepared from an NCO-ended prepolymer consisting of a low unsaturated, low dispersity diol and a symmetric diisocyanate (i.e. no 4,4′-MDI), which is reacted with a “bulky” diamine chain extender. In the examples Acclaim 4200 (polyether diol with OHv 28) is used together with HDI and 2-methyl-1,5-pentanediamine. The elastomer showed an elongation at break of more than 2000%.
Because these materials have a low- and non-aromatic hardblock content, it is my opinion that they show creep rather than elasticity.

methylpentandiamine

2-methyl-1,5-pentanediamine

Aliphatic TPU with Reduced Effloresence

Patent Title: ALIPHATIC THERMOPLASTIC POLYURETHANES, PRODUCTION AND USE THEREOF

 Number/Link:   WO2018/192936 (German)

Applicant/Assignee:  Covestro

Publication date: 25 October 2018

Gist”: TPU based on 1,10-decanediisocyanate shows reduced blooming

Why it is interesting: Aliphatic thermoplastic polyurethanes, based on hexanediisocyanate (HDI) can show “blooming” i.e. the formation of a white precipitate on the surface of the material.  It is believed that this is caused by the formation of cyclic oligourethanes migrating to- and forming crystals on the surface. According to this invention, this blooming behaviour can be prevented by using long-chain aliphatic diisocyanates like 1,10-diisocyanatodecane or 1,12-diisocyanatododecane instead of HDI.

DDI

1,10-diisocyanatohexane (DDI)

 

Polyurethanes from Bisphenol-Based Polyols

Patent Title:  OLIGOMERIC POLYOL COMPOSITIONS

 Number/Link:WO2018/190891

Applicant/Assignee:  Presidium USA

Publication date: 18 October 2018
Gist”: Polyurethanes from high functionality  bisphenol-based polyols

Why it is interesting: The invention relates to high functionality (and high viscosity) polyols that consist of bisphenol moieties and aliphatic polyol moieties and that can be prepared by reacting a bisphenol-based polycarbonate with a short-chain, high functionality polyol in the presence of a suitable catalyst or promotor.  In the examples a bisphenol-A based polycarbonate powder is reacted with propoxylated pentaerythritol and a tetra – OH – functional tert-amine that acts as a promotor.  The polyols are said to be useful for high stiffness polyurethanes that show improved heat distortion and a relatively low reaction exotherm.

multranol

Catalytic tetrol used in the invention

 

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)