#prepolymer

Polyurethane Prepolymer with Very Low Monomeric Isocyanate Content

Patent Title: ULTRALOW MONOMER POLYURETHANES

 Number/Link: WO 2016/142513

Applicant/Assignee: Henkel

Publication date: 15-09-2016

“Gist”: An NCO-ended prepolymer is reacted with a bis(alkoxysilylalkyl)amine

Why it is interesting: This invention is about laminating adhesives with a ‘primary aromatic amine migration limit’ of less than 10ppb, in accordance with the EU regulation for food packaging…

Patent Title: ALKENYL ETHER POLYOLS

 Number/Link: WO2016038112 (German)

Applicant/Assignee: Henkel

Publication date: 17-03-2016

“Gist”: Alkenylether-functional polyols are used in oligomeric PU adhesives.

Why it is interesting:Alkenylether-functional groups are highly reactive and can be cured by UV-initiated cationic polymerization. This has the advantage of being unsensitive to oxigen which…

Classic PU Patent of the Month: ICI on MDI Prepolymers and “Cold Cure” Flexible Foams (1978)

Title: Liquid polyisocyanate compositions

 Number/Link:  EP10850

Applicant/Assignee: Imperial Chemical Industries

Publication date: 14-05-1980

“Gist”: Liquid compositions from 2,4′/4,4′-MDI  prepolymers and polymeric MDI.

Why it is interesting:The first polyurethane flexible foams were all based on toluene diisocyanate (TDI).  Other commericially available isocyanates like “pure MDI”  (4,4′/…

Flexible Foams from Inverse NOP Prepolymers

Title: Polyurethane Foam

 Number/Link:US2014329923

Applicant/Assignee: Green Urethanes

Publication date: 06-11-2014 (priority PCT)

“Gist”: Flexible polyurethane foams based on OH-ended natural-oil polyol prepolymers

Why it is interesting:Polyols based on natural oils (NOPs) such as rapeseed-, soy-, castor oil and the like are hydrophobic, have sterically hindered hydroxyl groups and are therefore…