All posts tagged Fire & Smoke

Hybrid PU-PF Rigid Foams

Title: RIGID POLYURETHANE FOAM

 Number/Link: EP2591034A1

Applicant/Assignee: BASF

Publication date: 15-05-2013  (priority PCT/EP)

“Gist”: Use of novolac polyols in rigid (spray) foams to improve reactivity and flammability properties.

Why it is interesting: ‘Novolacs’ are phenol-formaldehyde (PF) resins which are produced at a p:f ratio of  >1 (as opposed to ‘resols’ where this ratio is <1) Novolacs are therefore phenol (OH) ended and can be used together with isocyanates to prepare hybrid polyurethanes. In this case novolacs with a functionality of about 4-8 are used together with conventional rigid foam polyol(s) in which the novolacs are dissolved (after heating and opt. melting) in an amount of about 40%. Together with polymeric MDI, water and conventional additives rigid (spray) foams are produced with improved flammibility, smoke, scorching and reactivity properties.

Novolac resin

Novolac resin

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by Gerhard Bleys on May 22, 2013  •  Permalink
Posted in Rigid Foams
Tagged , , , ,

Posted by Gerhard Bleys on May 22, 2013

https://purpatents.com/2013/05/22/hybrid-pu-pf-rigid-foams/

Polyurethane Foams from Sugar

Title: Sugar-Based Polyurethanes, Methods for Their Preparation, and Methods of Use Thereof

 Number/Link: US2013030067

Applicant/Assignee: Imperial Sugar Co.

Publication date: 31-01-2013

“Gist”: Very low density semi-rigid foams are produced from sucrose syrup and MDI.

Why it is interesting: Open celled foams are prepared from sucrose, water, MDI and preferably a  flame retardant at an NCO index from 20-60 (preferred). A number of examples is given of foams with densities 0f 8 kg/m3 (0.5 pcf) which is quite low.  Mechanical an heat insulation properties are probably not very good but the foams are very ‘green’ and cheap. Useful as sprayable acoustic foams?

Sucrose

Sucrose

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by Gerhard Bleys on February 5, 2013  •  Permalink
Posted in Rigid Foams
Tagged , , , ,

Posted by Gerhard Bleys on February 5, 2013

https://purpatents.com/2013/02/05/polyurethane-foams-from-sugar/

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/

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