All posts tagged NOP polyols

Improved Cellopening System for Flexible Foams

Title: Process For Producing Flexible Polyurethane Foam Using Natural Oil Polyols

Patent Number & Link: US2013/197114

Applicant/Assignee: Air Products

Publication date: 1-08-2013

“Gist”: Use of 2-cyanoacetamide as cellopener together with a dipolar aprotic liquid as “cellopening aide” in moulded flexible foams.

Why it is interesting: The use of compounds with an active (acidic) methylene group like 2-cyanoacetamide as cellopener for flexible foam is known (US6136876) but has some disadvantages like low solubility in polyol and low reproducibility when dissolved in water. The use of these cellopeners together with dipolar aprotic solvents like dimethylsulfoxide (DMSO) or glycols like PEG200 supposedly solves these problems and allows for the use of a lower amount of the cellopener.  In the examples 0.03 pphp of cyanoacetamide is used together with 0.12pphp of DMSO. Strangely claim 1 expressly states the use of at least one NOP (natural oil based polyol) while this does not seem relevant to the invention.

2-cyanoacetamide

2-cyanoacetamide

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by Gerhard Bleys on August 6, 2013  •  Permalink
Posted in Flexible Foams
Tagged , , , , , ,

Posted by Gerhard Bleys on August 6, 2013

https://purpatents.com/2013/08/06/improved-cellopening-system-for-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/

Making a Better NOP-based Flexible Foam

Title: Additives For Improving Natural Oil Based Polyurethane Foam Peformance

 Number/Link: US2013/0065978

Applicant/Assignee: Air Products

Publication date: 14-03-2013

“Gist”: Incorporating a small amount of cyanoguanidine into a NOP-based flexible foam improves airflow and humid ageing.

Why it is interesting: Now that natural oil polyols (NOPs) are becoming mainstream in flexible polyurethane foams (at least in the patent literature), it is to be expected that specific catalysts, surfactants and other additives will be developed for these systems.  Air Products claims to improve air flow and humid ageing properties of NOP-based foams by adding small amounts ( about 0.05 parts per 100 polyol) of solutions (in e.g. DMSO) of guanidine or its derivatives like cyanoguanidine or guanidinehydrochloride salt  to the formulation.  While it is not immediatly clear why this should work, the effect seems to be real.

2-cyanoguanidine

2-cyanoguanidine

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by Gerhard Bleys on March 19, 2013  •  Permalink
Posted in Flexible Foams, Polyols
Tagged , , ,

Posted by Gerhard Bleys on March 19, 2013

https://purpatents.com/2013/03/19/making-a-better-nop-based-flexible-foam/

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