Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Polymethylene polyphenylene isocyanate

Figure 6.3 Structures of maleic anhydride polypropylene (MAPP) (a) and polymethylene polyphenylene isocyanate (PMPPIC) (b). Figure 6.3 Structures of maleic anhydride polypropylene (MAPP) (a) and polymethylene polyphenylene isocyanate (PMPPIC) (b).
The most common polyisocyanate used in urethane sealant production is toluene diisocyanate (TDI). The TDI is usually prereacted to give an isocyanate-terminated prepolymer. Other aromatic polyisocyanates used in sealants include diphenylmethane diisocyanate (MDI) and polymethylene polyphenylene isocyanate (PAPI). All of the aromatic poly isocyanates contribute to yellowing of urethanes on exposure to light. [Pg.625]

At least 90 % of the worldwide production of isocyanates is accounted for by two aromatic isocyanates, toluene diisocyanate (TDI), a distilled compound, and polymethylene polyphenylene polyisocyanate (PMDI), an undistilled isocyanate mixture with a low vapor pressure (Structures 1-3). Together these two products cur-... [Pg.1214]

Polymethylene polyphenylene Poly(phenyl isocyanate-co- 9016-87-9 Isocyanic acid, polymethylene- R Unk... [Pg.2290]

See other pages where Polymethylene polyphenylene isocyanate is mentioned: [Pg.135]    [Pg.26]    [Pg.690]    [Pg.756]    [Pg.327]    [Pg.690]    [Pg.135]    [Pg.26]    [Pg.690]    [Pg.756]    [Pg.327]    [Pg.690]    [Pg.287]    [Pg.935]    [Pg.935]   


SEARCH



Polymethylen

Polymethylene

Polymethylenes

Polyphenylenes

© 2024 chempedia.info