Brominated Polyurethane Oligomers

Title: FLAME-RETARDING OLIGOMERIC BROMINATED URETHANE COMPOSITIONS

 Number/Link: US2013/0217286

Applicant/Assignee: Lubrizol

Publication date: 22-08-2013 (priority PCT)

Gist”: Use of highly brominated isocyanate-reactive monomers to prepare brominated PU oligmers useful as non-leaching fire retardants.

Why it is interesting: Brominated fire retardants are highly effective in polyurethanes but their use is being phased-out because of environmental issues and the production of some of them will be discontinued in the near future. Brominated PU oligomers can be used as fire retardants with less environmental problems as they are not fugitive and will leach less.  The oligomers can be produced using monofunctional highly brominated isocyanate-reactive monomers like tribromoneopentanol or pentabromophenol. Difunctional brominated monomers can also be using together with monofunctional isocyanates to control the molecular weight which is preferably between 800 and 20,000 (claimed).  The oligomers can be used as fire retardants in PU dispersions (claimed) and in other polyurethane compositions e.g. in TPUs.

pentabromophenol

pentabromophenol

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