All posts tagged isocyanate-free

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/

Even more non-isocyanate polyurethanes – this time from Dow!

Title: CYCLIC CARBONATE MONOMERS AND POLYMERS PREPARED THEREFROM

 Number/Link: WO2013028292

Applicant/Assignee: Dow

Publication date: 28-02-2013

“Gist”: Preparation of  divinylbenzene dicyclic carbonate and its reaction with triethylenetriamine and blowing agent to make poly(hydroxyurethane) foams.

Why it is interesting: There seems to be a growing interest in non-isocyanate production of (hydroxy) polyurethanes based on cyclic carbonates and amines  (see also my earlier posts on the subject). This may well be due to an increasing pressure upon system producers to reduce the concentration of free monomeric isocyanates in applications such as spray foams, one component froth foams and coatings. Because the cyclic carbonates – in contrast to isocyanates- are not water-reactive they can also be used to produce water-based coatings e.g.
Dow claims to have improved upon the existing art with new cyclic carbonate monomers, which are liquid and more reactive than prior art monomers.  The new monomers are prepared form divinylarene dioxides and CO2.

a divinylbenzenedioxide whcih can be turned into the dicyclocarbonate using CO2

a divinylbenzenedioxide which can be turned into the dicyclocarbonate using CO2

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by Gerhard Bleys on March 8, 2013  •  Permalink
Posted in Adhesives-Coatings, Rigid Foams
Tagged ,

Posted by Gerhard Bleys on March 8, 2013

https://purpatents.com/2013/03/08/even-more-isocyanate-free-polyurethanes-this-time-from-dow/

More Isocyanate-Free Polyurethanes

Title: FUNCTIONAL POLYURETHANE PREPOLYMER, METHOD OF PREPARING POLYURETHANE BY USING THE SAME, AND APPLICATION METHOD THEREOF

 Number/Link: US2013004677

Applicant/Assignee: AMKANG UNIVERSITY (TAIWAN)

Publication date: 3-01-2013

“Gist”: Bis(cyclic carbonate) compounds are produced by reacting  bisphenol-A diglycidylether with CO2.  These are then reacted with diamine oligomers (EO-PO and/or PDMS) to produce amine ended β-hydroxy-PU prepolymers which in turn are capped with acrylates to make a UV curable system useful for coating fabrics.

Why it is interesting: The materials are produced without “toxic” isocyanates and “harmful” phosgene (sic), but still need “harmful” amines and solvents. If made solvent-free, however, systems like this could make a lot of sense in e.g. synthetic leather production (IMHO).

isofreePU

Isocyanate-free PU from BPA-based cyclic carbonates and amines

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by Gerhard Bleys on January 11, 2013  •  Permalink
Posted in Adhesives-Coatings, Isocyanates and Prepolymers
Tagged , ,

Posted by Gerhard Bleys on January 11, 2013

https://purpatents.com/2013/01/11/more-isocyanate-free-polyurethanes/

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