All posts by Gerhard Bleys

Translucent Rigid Foams

Patent Title: TRANSLUCENT POLYURETHANE FOAMS

 Number/Link: WO2018/178139  WO2018/177987  (German)

Applicant/Assignee:  Covestro

Publication date: 4 October 2018

“Gist”: Rigid foam formulation is mixed without air to delay nucleation

Why it is interesting: The invention is about translucent rigid foams which are said to be useful as wall and roof elements such as light strips, light domes and the like.  The foams are based on (pref.) trimerized aliphatic diisocyanates and are blown with water.  The composition is degassed and then mixed without inclusion of air to delay nucleation. The resulting foams have a course cell structure and thick cell struts which apparently allows light to pass through.

 

Desmodur N3900

Asymmetric trimer of HDI (iminooxadiazinedione)

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by Gerhard Bleys on October 5, 2018  •  Permalink
Posted in Rigid Foams
Tagged , , , , , , , ,

Posted by Gerhard Bleys on October 5, 2018

https://purpatents.com/2018/10/05/translucent-rigid-foams/

Free Download: Polyurethane Science Scan Nr.14 – August & September 2018

You can now download the 14th issue of my PU Science review for FREE from my webshop at http://sellfy.com/GeertBleys.

frontpage14

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by Gerhard Bleys on October 2, 2018  •  Permalink
Posted in Uncategorized

Posted by Gerhard Bleys on October 2, 2018

https://purpatents.com/2018/10/02/free-download-polyurethane-science-scan-nr-14-august-september-2018/

Temperature Stable Memory Foams

Patent Title: VISCOELASTIC POLYURETHANE FOAMS WITH REDUCED TEMPERATURE SENSITIVITY

 Number/Link: WO2018/169833

Applicant/Assignee:  Covestro

Publication date: 20 September 2018

“Gist”: A polyol blend comprising a relatively low-EO monol,  diol and triol is foamed with TDI

Why it is interesting: Viscoelastic or “memory” foams are popular materials for pillows and mattresses. One drawback of these materials is the sensitivity of hardness to room temperature variations. According to this invention the hardness variations can be reduced by preparing the foams form TDI and a polyol blend comprising a monofuntional polyether with an EO content of less than 20%, a polyether diol and a polyether triol both with an EO content of less than 45% together with water, catalysts and other additives. The polyol blend can optionally be made in situ.  The foams show an E'(15°C)/E'(30°C) ratio between 1 and 4, a Tg of less than 20°C (defined as the temperature of max. tanδ),  together with high air flow and tear strength values.

DMTA

DMTA trace of foam according to the invention

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by Gerhard Bleys on September 25, 2018  •  Permalink
Posted in Flexible Foams
Tagged , , , , , , , , , , ,

Posted by Gerhard Bleys on September 25, 2018

https://purpatents.com/2018/09/25/temperature-stable-memory-foams/

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