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
1986-07-08
1987-07-28
Welsh, Maurice J.
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 75, 528 76, 528 85, 560 26, 560 33, C08G 1876
Patent
active
046832793
ABSTRACT:
This invention relates to urethane linked mixtures of 2,4- and 2,6-toluenediisocyanates (ULTDI dimers) having low melting points and to a method of forming these systems. The urethane linked toluenediisocyanates containing from 45-90% of the 2,4- and 10-55% of the 2,6- isomer by weight are formed by reacting two moles of an appropriate isomer mix of toluenediisocyanate, with one mole of a specific alkylene glycol, e.g., 1,2-butanediol, diethylene glycol or dipropylene glycol under conditions such that essentially only one of the isocyanate groups on a toluenediisocyanate molecule reacts with a hydroxyl group of the glycol. Conditions are controlled such that the urethane linked toluenediisocyanates are formed. The resulting product, which has two unreacted isocyanate groups, is suited for producing a variety of elastomers including polyurethane polyurethane/urea or polyurea elastomers.
REFERENCES:
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patent: 3020249 (1962-02-01), Curtis
patent: 3023228 (1962-02-01), Wagner et al.
patent: 3076770 (1963-02-01), Saunders et al.
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Casey Jeremiah P.
Grandin Roland E.
Milligan Barton
Starner William E.
Air Products and Chemicals Inc.
Brewer Russell L.
Innis E. Eugene
Simmons James C.
Welsh Maurice J.
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