Method of producing polymers of the polyurethane type

Details Method of producing polymers of the polyurethane type Method of producing polymers of the polyurethane type

1983-07-05

1984-11-06

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 76, 528 80, 528 83, 528162, 528164, 528248, 528261, 528266, C08G 1800

Patent

active

044813465

ABSTRACT:
A method of producing polymers of the polyurethane type without the use of isocyanates is characterized by that compounds containing active atoms of hydrogen, preferably oligoesterols or oligoetherols, are amidated with isocyanic acid, preferably obtained "in statu nascendi", and then amide compounds thus obtained, preferably oligourethanes, oligoallophanates or oligourethanallophanates, are condensed with an aldehyde in a medium of pH not higher than 10, till obtaining a polymer.
It is preferable to amidate oligoesterols or oligoetherols with isocyanic acid obtained from urea in the presence of hydrochloride of a tertiary amine. Oligourethanes, oligoallophanates or oligourethanallophanates can be condensed alone with formaldehyde or in the presence of other compounds able to react with formaldehyde or their hydroxymethyl derivatives.

REFERENCES:
patent: 3652507 (1972-03-01), Burk et al.
patent: 3702320 (1972-11-01), Fritok et al.
patent: 3931425 (1976-01-01), Kuroda
patent: 3960818 (1976-06-01), Spiewak
patent: 4154724 (1979-05-01), Schulze
patent: 4156784 (1979-05-01), Dockner et al.

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