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...
Patent
1976-10-08
1978-07-04
Cockeram, H.S.
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...
521159, C08G 1810, C08G 1876
Patent
active
040987736
ABSTRACT:
The invention concerns a process for making heat-resistant polyurethane elastomers from substantially linear polyhydroxyl compounds of high molecular weight, polyisocyanates, chain extenders, and, if desired, catalysts and additives, in which the polyhydroxyl compound is reacted with diisocyanate material in amounts to give an OH:NCO ratio of 1:1.10 to 1:2 and produce an adduct, and the adduct is subsequently reacted with symmetrical aromatic diisocyanate and a diol as chain extender (preferably a linear diol containing 2,4 or 6 carbon atoms) to obtain a crystalline or crystallizable diurethane or polyurethane of good heat resistance.
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patent: 3070427 (1962-12-01), Harris et al.
patent: 3457234 (1969-07-01), Gianatasio
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Smith-Rubber World, vol. 139, pp. 533-541 and 699-701 (1959).
Saunders et al., Polyurethanes, Part I, pp. 269-272, 278-283; Part II, pp. 400 and 411-416, Interscience, N.Y. 1962 and 1964.
Schneider et al. Macromolecules, Feb. 1975, pp. 62-67.
Illers Karl Heinz
Stutz Herbert
BASF Wyandotte Corporation
Cockeram H.S.
Dunn Robert E.
Linkhauer John W.
Swick Bernhard R.
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