All posts tagged Environment

PU Rigid Foams from Biomass Proteins

Title: POLYOLS FROM BIOMASS AND POLYMERIC PRODUCTS PRODUCED THEREFROM

Number/Link:WO2015/105542

Applicant/Assignee: Inventors

Publication date: 16-07-2015

“Gist”: Soy bean proteins are hydrolysed and reacted with diamines and cylocarbonates to produce “rigid” polyols.

Why it is interesting: During recent years a lot of research has been done on the use of renewable raw materials in polyurethanes. Most of this research was on the use of natural oils despite the fact that the availability of biomass proteins is much higher. Soybeans for example contain about twice as much protein (about 38% w/w) than oil (18%) and the price is about half that of the oil. According to this invention soybean proteins are hydrolysed into amino acids which are then reacted with ethylene diamine to make amine-ended monomers. These monomers are reacted with a cyclocarbonate (ethylene carbonate or glycerol carbonate) resulting in a mixture of hydroxyurethane oligomers. The mixture is a low viscous liquid with high hydroxyl value useful for the production of rigid foams.

Reaction sequence according to the invention

Polyurethane-Polyamides from Dimer Diacids

Title: A POLYOL BASED ON DIMER FATTY ACID RESIDUES AND THE CORRESPONDING POLYURETHANES

Number/Link:WO2015/097433

Applicant/Assignee: Croda

Publication date: 2-07-2015

“Gist”: Polyurethane/polyamide elastomers based on dimer diacids and long chain dicarboxylic acids

Why it is interesting: Polyurethane elastomers (and thermoplastic elastomers) based on dimer diacids or dimer diols are very hydrophobic and hydrolysis resistant but are relatively soft with lowish mechanical properties. According to this invention, using a blend of a dimer diacid (or -diol) and a (semi-) crystalline C17 to C32 dicarboxilic acid (or -diol) results in elastomers with greatly improved hardness and tensile strength while retaining flexibility and hydrolysis resistance. The C17 to C32 dicarboxylic acids can be prepared by a self-metathesis reaction of unsaturated fatty acid esters. In the examples a C36 dimer diacid is used together with 1,18-octadodecanoic acid (prepared by metathesis from methyl oleate). This is reacted ‘one shot’ with 4,4′ MDI and hexanediol or DEG, resulting in 85 shore A elastomers with high elongation and hydrolysis resistance.

A C36 dimer diacid

Polyurethanes with Reduced Aldehyde Emissions

Title: POLYURETHANES HAVING REDUCED ALDEHYDE EMISSION

Number/Link:WO2015/082316 (German)

Applicant/Assignee: BASF

Publication date: 11-06-2015

“Gist”: Use of CH-acidic compounds as aldehyde scavengers

Why it is interesting: Reducing VOC emissions, and especially aldehyde emissions, from polyurethane systems remains an important research topic and has been discussed before on this blog (see e.g. here and here). To reduce aldehyde emissions, scavenger molecules are used which are often amines or hydrazine compounds. In this invention however the aldehyde scavenger is a CH-acidic compound of the form R-CH2-R’ in which R and R’ are electron-withdrawing groups. The R-groups can be iso-reactive and the molecule can (preferably) contain more than one acidic CH2 group, like e.g. trimethylolpropane triacetoacetate. Other examples are N,N-dimethylacetoacetamide and dimethyl 1,3-acetonedicarboxylate. The compounds are used in an amount of 0.5 to 1 pphp, are said to have advantages over the prior art like less or no catalytic activity and do not lead to extra emissions.

Trimethylolpropane triacetoacetate

Innovation in Polyurethanes

All posts tagged Environment

PU Rigid Foams from Biomass Proteins

Polyurethane-Polyamides from Dimer Diacids

Polyurethanes with Reduced Aldehyde Emissions

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