A C36 dimer diacid
July 6, 2015 15:51
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
Posted by Gerhard Bleys
Categories: Adhesives-Coatings, dispersions, Elastomers, Polyols, Thermoplastics
Tags: bio-based materials, dimer diacid, dimer diol, dispersions, elastomers, Environment, hotmelt, hydrophobic, metathesis, NOP polyols, polyamides, renewable materials, TPE, TPU
Mobile Site | Full Site
Get a free blog at WordPress.com Theme: WordPress Mobile Edition by Alex King.