All posts tagged IPN

Polyurethane-Epoxy IPN Composites

Patent Title: POLYMER COMPOSITE THERMAL INTERFACE MATERIAL WITH HIGH THERMAL CONDUCTIVITY

 Number/Link: WO2016/079627

Applicant/Assignee: IBM

Publication date: 26-05-2016

“Gist”: PU-Epoxy IPN particle composites show improved thermal conductivity

Why it is interesting: The application is about thermally conductive adhesives for use with electronic components. Commonly these materials consist of polymers filled with thermally- (but not electrically-) conductive particles such as AlN, BN and ZnO. According to the invention the thermal conductivity of these composites can be improved by using a polyurethane-epoxy true interpenetrating polymer network (IPN) as the matrix. In the examples a MDI-polycaprolactone prepolymer is mixed with a BPA diglycidylether prepolymer and boron nitride (BN) particles and crosslinked using trimethylolpropane and imidazole.  The thermal conductivity of the composite shows a synergy, meaning that it is clearly higher than the conductivities of both the PU or EP composites. The synergy is said to be due to an enhanced distribution of the BN particles and (because this is IBM and they are very clever) due to enhanced phonon scattering.

Bisphenol-A diglycidylether

Bisphenol-A diglycidylether

1 Comment
by Gerhard Bleys on May 30, 2016  •  Permalink
Posted in Adhesives-Coatings
Tagged , , , , , , , , ,

Posted by Gerhard Bleys on May 30, 2016

https://purpatents.com/2016/05/30/polyurethane-epoxy-ipn-composites/

Dual-Cure PU for 3D Printing

Patent Title: POLYURETHANE RESINS HAVING MULTIPLE MECHANISMS OF HARDENING FOR USE IN PRODUCING THREE-DIMENSIONAL OBJECTS

 Number/Link: US2016137839

Applicant/Assignee: Carbon3D

Publication date: 19-05-2016

“Gist”: Isocyanates are blocked with ethylenically unsaturated blocking agents

Why it is interesting: This invention relates to additive manufacturing of 3D objects using photocurable liquids. The liquid consists of a diisocyanate, or a difunctional isocyanate-ended prepolymer, which is blocked with an ethylenically unsaturated blocking agent, for example t-butylaminoethylmethacrylate (TBAEMA). The photocurable liquid further comprises a diol (or diamine), a photoinitiator and a ethylenically unsaturated diluent, for example a methacrylate or a styrene.  The liquid can then be selectively cured into an intermediate solid 3D object by irradiation with UV light using conventional “printing” methods. After an optional washing stage the intermediate object can be finally cured using heat.

TBAEMA

TBAEMA

Leave a comment
by Gerhard Bleys on May 23, 2016  •  Permalink
Posted in Elastomers
Tagged , , , ,

Posted by Gerhard Bleys on May 23, 2016

https://purpatents.com/2016/05/23/dual-cure-pu-for-3d-printing/

Toughened Thermoplastic Polyurethane

Title: Method Of Toughening Thermoplastic Polyurethane And Articles Comprising Toughened Thermoplastic Polyurethane

 Number/Link: US2013/0323512

Applicant/Assignee: Nike

Publication date: 5-12-2013

“Gist”: TPU is interpenetrated with a thermosetting PU using a solvent

Why it is interesting: According to this invention a conventional TPU can be “toughened” by dipping and  swelling it in a solution containing (about) 20% of a PU-forming composition comprising a polyester polyol, a chain extender, a mixture of pure and polymeric MDI and DBTDL as a catalyst.  The solvent is preferably acetone. The swollen TPU is dried and the PU is cured by heating. It is believed that a TPU-PU interpenetrating polymer network (IPN) is formed.  The invention is targeted at improving the scuff resistance of golf balls. (scuff resistance=resistance against failure of the coating by shear stress).

Nike golf ball.

Nike golf ball.

Leave a comment
by Gerhard Bleys on December 10, 2013  •  Permalink
Posted in Elastomers, Thermoplastics
Tagged , , , , ,

Posted by Gerhard Bleys on December 10, 2013

https://purpatents.com/2013/12/10/toughened-thermoplastic-polyurethane/

Newer Posts »

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 259 other subscribers

  • Follow Innovation in PU on Twitter