All posts by Gerhard Bleys

Classic PU Patent of the Month: “Hypersoft” Flexible Foams (1971)

Title: PROCESS FOR OBTAINING POLYURETHANE FOAMS

Number/Link: GB1381925

Applicant/Assignee: PECHINEY UGINE KUHLMANN

Publication date: 29-01-1975 (priority FR – 1971)

“Gist”: Very soft hydrophilic flexible foam is made from TDI and a combination of a high EO polyol and a ‘conventional’ (hot cure) polyol.

Why it is interesting: Very soft – so called “hypersoft” – foams were prepared form TDI 80/20 and a mixture of polyols consisting of a random 75% EO -25% PO triol and a block 90% PO – 10% EO triol in a ratio of 85:15. (about). The foams were all-water blown and had densities of below 30 kg/m³, which was exceptional for the time.

Pechiney Logo.

4 Comments

by Gerhard Bleys on December 31, 2013 • Permalink

Posted in Classic PU Patent of the month, Flexible Foams, Polyols

Tagged comfort, hydrophilic

Posted by Gerhard Bleys on December 31, 2013

https://purpatents.com/2013/12/31/classic-pu-patent-of-the-month-hypersoft-flexible-foams-1971/

Improved Nanoporous Insulation Materials

Title: AEROGEL-CONTAINING POLYURETHANE COMPOSITE MATERIAL

Number/Link: WO2013182506 (German)

Applicant/Assignee: BASF

Publication date: 12-12-2013

“Gist”: An aqueous dispersion based on an isocyanate and an isocyanate-reactive vinyl polymer is used to bind aerogel particles into an insulation material.

Why it is interesting: Binding (silica) aerogel (or xerogel or cryogel) particles into insulation panels using aqueous polyurethane binders is known. See e.g. my previous posts on the subject here, here and here. According to this invention both the insulation and processing properties of existing systems can be improved by using an aqueous dispersion of a vinyl polymer containing isocyanate-reactive side groups, together with an emulsifiable isocyanate. The polyvinyl is preferably water-soluble, the side groups being -OH, -SH, -NH2 or -COOH, a (preferred) example being poyvinylamine with a molecular weight from 10,000 to 500,000. The isocyanate used is preferably a modified HDI or IPDI. In the examples materials are shown with densities of about 120 kg/m³ and a thermal conductivity of about 16 mW/m.K.

SLENTITE (TM) aerogel-PU insulation panel by BASF

Unique Type of Polyurethane Flexible Foam to Reduce Tyre Noise

Title: TYRE, THE INNER WALL OF WHICH HAS A LAYER OF SPECIFIC POLYURETHANE FOAM

Number/Link: WO2013/182477 (French)

Applicant/Assignee: Michelin

Publication date: 12-12-2013

“Gist”: A layer of flex foam is used to reduce cavity noise in car tyres, the foam being prepared form high EO polyol and 4,4′ MDI.

Why it is interesting: An important component of the noise produced by driving vehicules is attributed to resonances in the tyre cavities. It is know that this noise can be reduced by (partly) filling the tyre cavity with PU foam, but the foams are difficult to apply, add too much weight and do not show enough sound absorption. According to this invention these problems can be solved by adhering a layer of a specific flexible foam to the inside of the tire. The foam has a low density (30 to 60 kg/m³), and absorbs sound at the correct frequency for cavity resonances (190-230Hz). It is prepared from a prepolymer based on a 70-90% EO polyol and 4.4′ MDI, which is mixed with water and catalyst. The reacting mixture is poured into a spinning tyre where it cures and adheres to the inside of the cavity.
This foam -inlcuding the prepolymer- was actually invented by myself in 1991: EP547765

Cross-section of foam-lined tire according to the invention.

Innovation in Polyurethanes

All posts by Gerhard Bleys

Classic PU Patent of the Month: “Hypersoft” Flexible Foams (1971)

Improved Nanoporous Insulation Materials

Unique Type of Polyurethane Flexible Foam to Reduce Tyre Noise

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