Trimerized Pentamethylenediisocyanate

Patent Title: METHOD FOR MODIFYING AT LEAST PENTAMETHYLENE DIISOCYANATE BY MEANS OF SPIROCYCLIC AMMONIUM SALTS AS CATALYST

 Number/Link:WO2018/153801 (German)

Applicant/Assignee:  Covestro

Publication date: 30 August 2018

“Gist”: PDI is trimerized using a spirocyclic ammonium salt

Why it is interesting: The oligomerization of diisocyanates by trimerization or dimerization is well known.  Diisocyanates are partially trimerized using a catalyst which is “killed” when the desired conversion is reached. The remaining monomer is then removed. In this invention pentamethylenediisocyanate is trimerized using a spirocyclic ammonium salt as catalyst, which apparently results in a desirable amount of asymmetric trimer (i.e. iminooxadiazinedione groups) as opposed to symmetric trimer (isocyanurate groups).  In the examples 5-azo-spiro[4,5]decane hydrogendifluoride is used as catalyst.

spiro catalyst

Spirocyclic ammonium salt used as catalyst in the invention

Leave a comment
by Gerhard Bleys on September 3, 2018  •  Permalink
Posted in Uncategorized

Posted by Gerhard Bleys on September 3, 2018

https://purpatents.com/2018/09/03/trimerized-pentamethylenediisocyanate/

Previous Post
Next Post
Leave a comment

Leave a Reply

Fill in your details below or click an icon to log in:

Gravatar
WordPress.com Logo

You are commenting using your WordPress.com account. ( Log Out /  Change )

Google photo

You are commenting using your Google account. ( Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. ( Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. ( Log Out /  Change )

Cancel

Connecting to %s

  • Pages

  • Categories

  • Enter your email address to follow this blog and receive notifications of new posts by email.

    Join 1,085 other followers

  • Follow Innovation in PU on Twitter