All posts in category Polyols

Hybrid Polymer Polyols

Title: HYBRID PHD/PMPO POLYOLS FOR POLYURETHANE FOAM APPLICATIONS

 Number/Link: WO2013090325 (=US20130158142)

Applicant/Assignee: Bayer

Publication date: 20-06-2013

“Gist”: A hybrid SAN-PHD filled polyol allows for higher solids content and lower viscosity.

Why it is interesting: “Filled polyols” (i.e. polyols containing dispersed particles) are well known in polyurethane technology and are available in three types depending on the type of particles dispersed. “PIPA” polyols contain polyurethane particles, “PHD” polyols contain polyurea (“polyharnstoff”) particles and “polymer polyols” contain SAN (styrene-acrylonitrile) particles. The polyol in which the particles are dispersed is called the ‘base polyol’. The current invention teaches the preparation of a hybrid filled polyol by using PIPA or PHD polyol as (optionally part of) the base polyol to produce a SAN polymer polyol. The hybrid polymer polyol reportedly has has a lower viscosity at higher solids content and foams produced with it are claimed to have improved fire and VOC properties.

SAN

SAN

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by Gerhard Bleys on June 25, 2013  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , , , ,

Posted by Gerhard Bleys on June 25, 2013

https://purpatents.com/2013/06/25/hybrid-polymer-polyols/

More Non-Isocyanate Polyurethanes

Title:  METHOD FOR PREPARING POLY(CARBONATE-URETHANE) OR POLY(ESTER-URETHANE)

 Number/Link: US20130144027

Applicant/Assignee: CENTRE NAT RECH SCIENT; TOTAL RES & TECHNOLOGY

Publication date: 6-06-2013 (priority PCT/EP)

“Gist”: Non-isocyanate polycarbonate- or polyester- polyurethane with very high softblock molecular weight produced by “immortal” ring opening polymerization.

Why it is interesting: Non-isocyanate PU systems appear to become a growing trend – at least in scientific and patent literature. In addition to not using phosgene or isocyanates, advantages quoted are improved biodegradability and recyclability.  The current invention teaches the use of “immortal” ringopening polymerization to polymerize 5,6 or 7 membered cyclic carbonates or cyclic esters. This type of ROP is highly efficient and is described in e.g. US2011092664.  The resulting polymer is subsequently modified with anhydrides to a polymer with carboxylic end-groups, which are then reacted with cyclic carbonates bearing hydroxyl groups.  The resulting polymer has a MW of (preferably) 50,000 to 100,000 and can be reacted with polyamines to produce the polyurethanes. See the reaction scheme below.

Reaction sequence according to the invention

Reaction sequence according to the invention

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by Gerhard Bleys on June 11, 2013  •  Permalink
Posted in Adhesives-Coatings, Polyols
Tagged , , , , , ,

Posted by Gerhard Bleys on June 11, 2013

https://purpatents.com/2013/06/11/more-isocyanate-free-polyurethanes-2/

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/

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