Potting medium from polyurethanes

Details Potting medium from polyurethanes Potting medium from polyurethanes

1981-03-13

1982-08-17

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...

528 73, 528 77, 2103212, 528 745, 528 60, 523112, C08L 9100, C08G 1824, C08G 1875, C08G 1877

Patent

active

043448739

ABSTRACT:
Potting media based on polyurethanes produced with castor oil, a process for their preparation as well as their use. To at least one of the ingredients of the potting medium is added a dialkyltin compound in an amount resulting in a content of from about 5 to 50 ppm, calculated as elementary tin, of the dialkyltin compound. A diisocyanate based on a carbon ring compound in stoichiometric excess is reacted with a mixture of castor oil and trimethylolpropane to a prepolymer having NCO-groups. Then the prepolymer is mixed with castor oil or a mixture of castor oil and trimethylolpropane for crosslinking. Preferred diisocyanates are aromatic diisocyanates having up to about 30 carbon atoms.
The potting media exhibit a favorable course of the viscosity, wet excellently and distribute very rapidly and are particularly suited for the embedding of membranes.

REFERENCES:
patent: 2983693 (1961-05-01), Sievers
patent: 3047520 (1962-07-01), Fiel
patent: 3274134 (1966-09-01), Ramos
patent: 3483150 (1969-12-01), Ehrlich et al.
patent: 3546148 (1970-12-01), Diamond et al.
patent: 3691117 (1972-09-01), Messerly
patent: 3965073 (1976-06-01), Olstowski et al.
patent: 4038239 (1977-07-01), Coyner et al.
patent: 4038304 (1977-07-01), Kazama et al.
patent: 4045527 (1977-08-01), Babayan et al.

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