Method of making a latently reactive, pasty molding material

Details Method of making a latently reactive, pasty molding material Method of making a latently reactive, pasty molding material

1990-05-01

1992-01-07

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant having at least one -n=c=x group as well as...

528 63, 524494, C08G 1810

Patent

active

050793292

ABSTRACT:
This invention is directed to a latently reactive pasty molding material (masterbatch), which only becomes reactive above ambient temperature (about 25.degree. C.), for producing temperature-resistant, elasticized, molded, duromer components which is comprised of a mixture of a methylene-diphenyl diisocyanate and a diamine which is not reactive at ambient temperature, but is reactive above about 120.degree. C., which is selected from the group consisting of an alkali-halide salt complex, which is the reaction product of three moles at 4,4'-diphenylmethane diamine and of one mole halide salt, and alternatively a hexamethylene-6,6'-diamine carbamate; and about 1 to 625 parts by weight (per 100 parts methylene-diphenyl diisocyanate) of a low-molecular weight isocyanate-terminated polyesterpolyol-diisocyanate prepolymer, produced from polycaprolactone and a mixture of the toluylene diisocyanate isomers. The mixture has a NCO excess of up to 15% more than the sum of the free OH-- and NH.sup.2 -- constituents. It can be modified with fillers and is moldable at low pressures. The molding material of this invention is also useful as an impregnating agent for the glass-fiber mats.

REFERENCES:
patent: 3871911 (1975-08-01), Conacher, Jr.
patent: 4552913 (1985-06-01), Wolfe et al.

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