Hybrid Polyisocyanurates for Composites and Coatings

Patent Title: DUAL-CURING ISOCYANURATE POLYMERS

 Number/Link:WO2018/087395 WO2018/087396  WO2018/087399 (German)

Applicant/Assignee:  Covestro

Publication date: 17 May 2018

Gist”:  Di-isocyanate trimer is reacted with hydroxymethacrylates and polyacrylates in the presence of a trimerization catalyst. 

Why it is interesting: According to these inventions a reaction system with two curing modes can be prepared by mixing high functionality oligomeric isocyanate, ethylenically unsaturated compounds, unsaturated compounds containing isocyanate-reactive groups, timerization catalyst and a free-radical initiator at an NCO index of 100 to 200. The system shows a relatively low viscosity and can e.g. be used in fiber-reinforced composites and in coatings. In the examples HDI trimer is reacted with hexanedioldimethacrylate and hydroxypropylmethacrylate in the presence of potassium acetate and a peroxybenzoic acid.

HDI isocyanurate

HDI-trimer


UV Crosslinkable TPU

Title: BREATHABLE AND CROSSLINKABLE THERMOPLASTIC POLYURETHANE

 Number/Link:  WO2015/164695

Applicant/Assignee: Lubrizol

Publication date: 29-10-2015

Gist”: TPU composition containing unsaturated polyester diol and long chain monol

Why it is interesting: A soft, plasticizer-free, TPU with low processing temperature and curable by UV light can be produced by incorporating an unsaturated polyester diol and a linear C20-C65 monol. The unsaturated polyester can e.g. be prepared from butanediol, adipic acid and some trimethylolpropane monallylether.  The TPU is said to be especially useful as UV curable adhesive for fabrics.

Trimethylolpropane monoallyl ether

Trimethylolpropane monoallyl ether