Hybrid Si-PU Flexible Foams

Title: METHOD FOR PREPARING FLEXIBLE POLYURETHANE FOAM WITH HYDROLYSABLE SILANE COMPOUNDS

 Number/Link: WO2013/48999

Applicant/Assignee: DOW

Publication date: 4-04-2013

“Gist”: Incorporation of hydrolysable silane compounds into flexible polyurethane foam formulation results in improved mechanical properties.

Why it is interesting: Compounds containing one or more hydrolysable silane groups Si-OR, where R denotes a hydrocarbyl group, and containing preferably at least one isocyanate-reactive group are incorporated into flexible foam formulations to introduce a secondary crosslinking mechanism. The crosslinking can occur by reaction with ambient moisture but preferably about 0.5 mole of water per mole of Si-OR group is added on top of the water used to blow the foam to the desired density. The extra crosslinking is claimed to improve mechanical properties (tear- and tensile strength and elongation-at-break) without adversely affecting the resilience and hysteris loss properties of the foam.

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by Gerhard Bleys on April 9, 2013  •  Permalink
Posted in Flexible Foams
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Posted by Gerhard Bleys on April 9, 2013

https://purpatents.com/2013/04/09/hybrid-si-pu-flexible-foams/

Polymer Polyols Based on Castor Oil

Title: GRAFT POLYOL AND METHOD OF FORMING THE SAME

 Number/Link: WO2013/039907

Applicant/Assignee: BASF

Publication date: 21-03-2013

“Gist”: Castor oil containing up to about 60% w/w modified SAN particles.

Why it is interesting: Castor oil is the only (commonly) occuring natural oil polyol (NOP).  Other natural oils need modifications which introduce isocyanate-reactive groups,  increasing their viscosity and therefore making them less useful to turn into “grafted” or polymer polyols.  In this invention styrene and acrylonitrile are copolymerised in castor oil together with a chain transfer agent and an ethylenically unsaturated ‘macromer polyol’. The macromer polyol is preferably a sorbitol-started EO/PO polyol with a molecular weight of about 6000 which is subsequently reacted with an unsaturated alifatic isocyanate. The macromer polyol sterically stabilizes the SAN particles and allows for high solid contents (up to 60% in the examples) at a reasonable viscosity. Polymer polyols are especially useful in flexible foam formulations.

Main Component of Castor Oil

Main Component of Castor Oil

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by Gerhard Bleys on April 2, 2013  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , , , ,

Posted by Gerhard Bleys on April 2, 2013

https://purpatents.com/2013/04/02/polymer-polyols-based-on-castor-oil/

Rigid Polyurethane Foam With Very High Amount of Fillers

Title: MEDIUM DENSITY FOAMS HAVING GOOD IMPACT RESISTANCE AND A PROCESS FOR THEIR PRODUCTION

 Number/Link: US2013072588

Applicant/Assignee: Bayer

Publication date: 21-03-2013

“Gist”: Up to 80% of a mixture of glass fibers and other fillers is incorporated into rigid foam to improve impact resistance.

Why it is interesting: Use of fillers in PU foams is well known but the amounts are usually limited to about 20% w/w. In this case 10-30% of glass fibers with a fiber length of about 25mm is used together with 30-60% of particulate fillers.  In the examples ammonium polyphosphate is used together with calcium carbonate and glass fibers.  Foam density ranges from 150 to about 350 kg/m3.  Bayer claims an improved impact resistance.  Other mechanical properties are not given.

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by Gerhard Bleys on March 27, 2013  •  Permalink
Posted in composites, Rigid Foams
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Posted by Gerhard Bleys on March 27, 2013

https://purpatents.com/2013/03/27/rigid-polyurethane-foam-with-very-high-amount-of-fillers/

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