Photocrosslinkable Polyurethane Coatings and Adhesives

Patent Title: PHOTORESPONSIVE POLYURETHANES

 Number/Link: WO2018/039453

Applicant/Assignee:  Univ of Akron

Publication date: 1-March-2018

Gist”: PU coatings or adhesives with built-in coumarin or phenacyl groups 

Why it is interesting: According to this invention, polyurethane coating- and adhesive systems with two ‘levels of strength’ can be made by incorporating photoresponsive groups like coumarin into the PU backbone.  The coumarin groups will dimerize when irradiated with UV light of about 340nm and can be cleaved again with light of about 250nm. Alkoxyphenacyl groups can also be built into the PU backbone, allowing photocleavage with UV light of 250-350nm. The use of coumarin in (self-healing) coatings is not new and has been discussed before in this blog, so I doubt that this is patentable.

coumarin monomer

Hydroxy functional coumarin monomer

Leave a comment

Leave a Reply

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

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 )

Connecting to %s