Steam-Treated Polyisocyanurate: Take Two



Applicant/Assignee: Dow

Publication date: 15-01-2015

Gist”: Treating PUR-PIR with hot water at superatmospheric pressure results in a Tg increase.

Why it is interesting: This is exactly the same invention as discussed a while ago on this blog: WO2014/160616 . But, apart from the title, the application has been completely re-written by another agent and filed less then 4 months  after the first one. The only difference in the claims appears to be that the temperature and index ranges are taken a bit wider and that filled polyols and polyester polyols are claimed separately.  Very strange.  Is it possible that they forgot they already filed this?

Isocyanurate group

Isocyanurate group

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