All posts tagged viscoelastic

Polyurethane Integral Skin Foam with Improved Acoustic Properties

Title:  INCREASING THE SOUND ABSORPTION IN FOAM INSULATING MATERIALS

 Number/Link: WO2013/007243  (German)

Applicant/Assignee: OTTO BOCK SCHAUMSYSTEME GMBH

Publication date: 17-01-2013

“Gist”: Use of  expandable graphite to improve sound absorption and sound insulation properties of  integral skin foams.

Why it is interesting: Expandable graphite is well known as an intumescent flame retardant in coatings and in e.g. low-density (semi-) rigid PU foams, including acoustic foams. This case claims the use of 5-40% (w/w on polyol) of non pre-expanded expandable graphite in a (preferably) 200-300 kg/m3 integral skin foam, resulting in improved sound absorption coefficients and sound insulation (transmission loss?).  It is contemplated that it is the layered structure of the graphite that absorbs the acoustic energy…

 

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by Gerhard Bleys on January 22, 2013  •  Permalink
Posted in Elastomers
Tagged , ,

Posted by Gerhard Bleys on January 22, 2013

https://purpatents.com/2013/01/22/polyurethane-integral-skin-foam-with-improved-acoustic-properties/

Flexible Polyurethane Foams containing Gel Particles: an Alternative to “Memory Foams”?

Title: COMPOSITE MATERIAL FOR MAKING ARTICLES OUT OF POLYURETHANE DOPED WITH POLYMERIC GEL AND THE PROCEDURE FOR MAKING IT

 Number/Link: WO2012160515

Applicant/Assignee: NEW WIND S.R.L.

Publication date: 29-11-2012

“Gist”: Viscoelastic foams produced by dispersing (silicon?) gel particles into the polyol stream.

Why it is interesting: Viscoelastic or “memory foams” are popular in the bedding industry. This case claims to improve upon the current technology by incorporating into the foam matrix 5 to 20% of ‘gel particles’ with a size of 1 to 5mm.  Advantages over curent memory foams mentioned are a lower glass transition temperature and a cool or “fresh” feel to the touch.  The ‘polymeric gels’ are however ill defined in the text and according to claim 6 “said silicone gel is a SEBS rubber”(?).  While being an interesting idea the case has little chance of being granted according to the examiners report. MemoryFoam

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by Gerhard Bleys on December 6, 2012  •  Permalink
Posted in Flexible Foams
Tagged ,

Posted by Gerhard Bleys on December 6, 2012

https://purpatents.com/2012/12/06/flexible-polyurethane-foams-containing-gel-particles-an-alternative-to-memory-foams/

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