Method of recycling waste polyurethane foams

0438317 - ÚMCH 2015 RIV eng P - Patent Document
Kruliš, Zdeněk - Horák, Zdeněk - Beneš, Hynek - Hájek, Milan
Method of recycling waste polyurethane foams.
2014. Owner: Ústav makromolekulární chemie AV ČR, v. v. i. - Ústav chemických procesů AV ČR, v. v. i. Date of the patent acceptance: 03.12.2014. Patent Number: EP2183311
R&D Projects: GA MŠMT 2B06097; GA ČR GA104/08/0416
Institutional research plan: CEZ:AV0Z40500505; CEZ:AV0Z40720504
Keywords : recycling * waste * polyurethane foams
Subject RIV: CD - Macromolecular Chemistry; CI - Industrial Chemistry, Chemical Engineering (UCHP-M)
http://worldwide.espacenet.com/publicationDetails/originalDocument?FT=D&date=20141203&DB=worldwide.espacenet.com&locale=en_EP&CC=EP&NR=2183311B1&KC=B1&ND=4

The present invention relates to a process for recycling waste polyurethane foams, produced by reacting polyester and/or polyether polyols with aromatic polyfunctional isocyanates, to a homogeneous single-phase liquid polyol mixture characterized in that the waste polyurethane is decomposed by the reaction with a low- molecular-weight polyhydric alcohol selected from the group consisting of ethylene glycol, propylene glycol, butanediol, pentanediol, hexanediol, 2-methylpropane-l,3-diol, diethylene glycol, dipropylene glycol, triethylene glycol, tripropylene glycol, trimethylolpropane (2,2- bis(hydroxymethyl)propan-l-ol), glycerol or their mixtures under the condition that the waste polyurethane and polyhydric alcohol are used in the weight ratio at least 3:1 and at the most 1:3 and the reaction mixture is subjected to the action of electromagnetic radiation of a frequency ranging from 1 MHz to 10 GHz at the temperature ranging from 50 to 300 degC.
Permanent Link: http://hdl.handle.net/11104/0241740