| 摘要 |
Polyurethane contains (a) a sec. or tert. aliphatic diisocyanate, (b) a OH cpd., and (c) Mg acetylacetonate or stearate, Ni acetylacetonate, Cd stearate, or an organic acid salt of 1,8-diazabicycylo(5.4.0)undec -7-ene as catalyst. - The isocyanate (a) is alpha, alpha, alpha', alpha'-1,3- or 1,4-xylylene diisocyanate; methylene bis(4-cyclohexyl isocyanate); 1,4-cyclohexylene diisocyanate; 1,8-p-menthane diisocyanate; or a pre-polymer with 5-30 % NCO, formed by reaction of a OH-terminated polyester or polyether (pref. with equiv. wt. of 100-2000) and a diisocyanate.
|
