Cold cure moulded car seat cushions
November 17, 2014 16:39
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’/ 2,4′- diphenylmethane diisocyanates mixtures) and “crude MDI” (mixtures of MDI and its higher homologues) were not suited for flexible foam production: the former because of it’s high crystallinity and therefore too high melting point and the latter because of its too high functionality. This classic invention solved the problem by prepolymerizing a 2,4’/4,4′-MDI mixture with a “flexible” polyol to an NCO content of 8 to 26% and then adding 10-50% of crude MDI to obtain a liquid composition. These liquid MDI compositions allowed the production of cold cure moulded flexible foams and the first MDI-based car seat cushions.
Cold cure moulded car seat cushions
Posted by Gerhard Bleys
Categories: Classic PU Patent of the month, Flexible Foams, Isocyanates and Prepolymers
Tags: automotive, comfort, MDI, moulding, prepolymer, TDI
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[…] in unstable foaming. The problem was eventually solved by using prepolymers and polymeric MDI, as mentioned before. More than 10 years later it was shown that it is possible to make flexible foams with […]
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