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
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Posted by Gerhard Bleys on January 22, 2013

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

Vulcanized Rubber Containing Isocyanate-Modified Filler

Title: FILLED ELASTOMER COMPRISING POLYURETHANE

 Number/Link: WO2013004714

Applicant/Assignee: BASF  (Chinese priority)

Publication date: 10-01-2013

“Gist”: “Raw” rubber is vulcanized in the presence of  precipitated silica (preferred) which has been modified with an isocyanate prepolymer (pref) containing a hydrophobic and/or rubber-reactive moiety.

Why it is interesting: The rubber can be NR, BR, SBR, IIR, EPDM, etc which is vulcanized in the conventional manner in the presence of a filler, preferably a fumed or precipitated silica.  The filler has been mixed with an isocyanate-ended prepolymer prepared from a 2000 MW polyol and a di-isocyanate.  The polyol preferably contains a hydrophobic group (e.g. from a fatty acid) or a double bond (from a unsaturated diacid).  As a result the filler will be dispersed more finely and will have a strong rubber interachtion potentially greatly improving the rubber properties.  Useful for footwear e.g.

Vulcanized Rubber Boots (Wikipedia)

Vulcanized Rubber Boots (Wikipedia)

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by Gerhard Bleys on January 18, 2013  •  Permalink
Posted in composites, Elastomers, Isocyanates and Prepolymers
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Posted by Gerhard Bleys on January 18, 2013

https://purpatents.com/2013/01/18/vulcanized-rubber-containing-isocyanate-modified-filler/

Tack-Free Polyurethane Gels

Title: SUPPORT STRUCTURES INCLUDING LOW TACK VISCOELASTOMERIC GEL MATERIAL AND METHODS

 Number/Link: US20130011621

Applicant/Assignee: Polymer Concepts Inc.

Publication date: 10-01-2013

“Gist”: Tack-free “non-bleeding” polyurethane gels by plasticizing a low-hardblock PU system with oils.

Why it is interesting: Polyurethane gels are often produced from low NCO-index systems, or other systems comprising ‘loose’ chains causing tackiness. Alternatively plasticizers can be used which can exude or ‘bleed’ especially at elevated temperatures.  This case claims a tack-free and non-bleeding gel.  In the example a low hardblock, index 98 system is plasticized by a combination of soy oil and epoxidized soy-oil, together with some 500cS silicon oil. Instead of natural oils a combination with hydrocarbon oil is claimed as well.   If true, this would be an interesting system, but it is hard to believe that the oils will not bleed over time. Especially the hydrocarbons.

Excercise Ball from Tack-Free PU gel

Excercise Ball from Tack-Free PU gel

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by Gerhard Bleys on January 15, 2013  •  Permalink
Posted in Elastomers
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Posted by Gerhard Bleys on January 15, 2013

https://purpatents.com/2013/01/15/tack-free-polyurethane-gels/

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