POLYSORB® isosorbide is a short chain diol. 

It is a very interesting new chain extender for polyurethanes, especially for elastomers. The synthesized new derivatives of isosorbide are suitable also for producing urethane-isocyanuric foams, cast polyurethanes, polyurethanes adhesives, coatings and sealants*.

http://ndl.ethernet.edu.et/bitstream/123456789/41437/1/27.pdf

Other questions - About Isosorbide

Does the 7 RIC (resin identification code) on plastic mean it contains POLYSORB® isosorbide?

See answer

What is the resin identification code (RIC) for isosorbide-based plastics?

See answer

What can be considered as a POLYSORB® isosorbide derivative?

See answer

Are POLYSORB® isosorbide-based polymers considered bio-based?

See answer

Is the higher heat resistance when using POLYSORB® isosorbide also valid in aromatic systems?

See answer

Is POLYSORB® isosorbide also a linear chain extender?

See answer

What are the USPs when compared directly to 1.4BDO?

See answer