Crosslinking TPU with Isocyanates.


 Number/Link: US2014/0094571

Applicant/Assignee: BASF

Publication date: 3-04-2014 (priority PCT/DE)

Gist”: A soft TPU is crosslinked using isocyanate dissolved in another TPU.

Why it is interesting: Crosslinking thermoplastic polyurethane parts to improve certain mechanical- and creep properties is known. In this case the crosslinking agent is an isocyanate with a functionality larger than 2, preferably an MDI prepolymer.  The isocyanate is dissolved in another TPU by melt blending in a twin-screw extruder at a temperature below 160°C and pelletizing. Pellets of a soft, polyester-based, TPU with a hardblock content less than 5% are mixed with the isocyanate-containing pellets, injection moulded and post-cured to crosslink the moulded part.

A TPU phone case.

TPU phone case.

Leave a comment

Leave a Reply

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

You are commenting using your 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

  • Pages

  • Categories

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

    Join 1,089 other subscribers
  • Follow Innovation in PU on Twitter

%d bloggers like this: