Linear segmented polyurethaneurea and process for production the

Details Linear segmented polyurethaneurea and process for production the Linear segmented polyurethaneurea and process for production the

1994-02-23

1996-07-30

Johnson, Rachel

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 51, 528 52, 528 61, 528906, 528 76, 524710, 524726, 524874, C08G 1810

Patent

active

055412807

ABSTRACT:
A linear segmented polyurethaneurea having a degree of branching (Nb) of 3 or less and obtained by chain-extending a prepolymer with an organic diamine in an organic solvent comprising dimethylformamide or dimethylacetamide, wherein the prepolymer has an isocyanate group at the both ends thereof and comprises a stoichiometrically excessive amount of a diisocyanate component selected from 4,4'-diphenylmethane diisocyanate, 2,4-toluene diisocyanate and 1,4-phenylene diisocyanate and a diol component having a number average molecular weight of 500 to 6000.

REFERENCES:
patent: 2929804 (1960-03-01), Steuber
patent: 3179625 (1965-04-01), Ehrhart
patent: 3509102 (1970-04-01), Horn et al.
patent: 4940750 (1990-07-01), Rosthauser et al.
Dec. 13, 1993 European Search Report in EAA 92 91 1110.2 with Annex.

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