A New Way to Remove Monomeric Isocyanate from Prepolymers

Title: REDUCTION OF THE FRACTION OF MONOMERS COMPRISING ISOCYANATE GROUPS IN MOISTURE-CURING POLYURETHANE COMPOSITIONS

 Number/Link: US2013/0158210

Applicant/Assignee: Sika

Publication date: 20-06-2013 (priority PCT/EP)

Gist”: Reduction of monomeric MDI in moisture curable prepolymers by addition of amino functional silica particles.

Why it is interesting: As noted in some previous posts in this blog (*) reduction of monomeric isocyanate from moisture curable systems is an important trend in PU systems development. The current invention solves this problem by adding isocyanate-reactive SiO2 particles to the prepolymer composition.  The particles have a preferred average size of 50-60μm, are (nano-)porous with a large specific surface area and have been chemically modified with (preferably) aminosilanes to make them amino-functional. Particles of this type with different functional groups are commercially available under the QUADRASIL tradename.
(*) Note that you can use the ‘search’ or ‘category’ boxes on the right (or in case of a mobile device on the bottom) of this page to help you navigate the site.

Porous Silica Particles

Porous Silica Particles

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 )

Twitter picture

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

Facebook photo

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

Google+ photo

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

Connecting to %s