All posts tagged bio-based materials

Can NOPs Rejuvenate Hot Cure Moulding?

Title: POLYOLS SUITABLE FOR HOT MOLDED FOAM PRODUCTION WITH HIGH RENEWABLE RESOURCE CONTENT

Number/Link: US2013/210951

Applicant/Assignee: Bayer

Publication date: 15-08-2013 (priority PCT)

“Gist”: Castor oil based polyols designed for hot cure flexible foam allow for higher renewable content.

Why it is interesting: In the recent years there has been a growing use of renewable-resource based polyols in flexible foam production. However, because the current moulded flexible foam industry is dominated by the so-called “cold cure” process which typically needs highly reactive polyols, the maximum amount of renewables is usually limited to about 10% of the polyol. Bayer have now developed a natural oil based polyol specifically for hot cure moulding. The polyol of the invention is based on castor oil, EO, PO and a DMC catalyst such that the total amount of EO is 20 to 30% and the total amount of primary OH is between 35-45%. When used in a hot cure moulding process the polyol allows for at least 30% (on the polyol) of renewables with foams having properties similar to conventional hot cure foams.

Major Component of Castor Oil

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

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

Innovation in Polyurethanes

All posts tagged bio-based materials

Can NOPs Rejuvenate Hot Cure Moulding?

Improved Cellopening System for Flexible Foams

Polymer Polyols Based on Castor Oil

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