Catalyst composition for body temperature of liquid polythiopolymercaptan polymers for making elastomeric dental impressions
AssigneeSybron Corporation
InventorMelvin L. Larson
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Abstract
An elastomeric dental impression catalyst composition for mouth temperature curing of liquid polythiopolymercaptan polymers comprised of propionic acid-treated, submicron zinc oxide and purified benzothiazyl disulfide (2,2.sup.1 -dithiobis-(benzothiazole)) is disclosed. The composition contains at least 20 parts by weight of the propionic acid-treated, submicron zinc oxide and less than 20 parts by weight of substantially pure benzothiazyl disulfide, with the amount of each of the zinc oxide and the benzothiazyl disulfide being based upon 100 parts by weight of the polymer. The final cured composition is also disclosed.
Claims5
A catalyst composition in the form of a paste suitable for body temperature cure of liquid polythiopolymercaptan polymers which comprises in weight percent about 40 to 60 percent organic acid-treated, submicron zinc oxide, about 5 to 20 percent benzothiazyl disulfide having a purity of at least 92 percent by weight, and where the ratio of zinc oxide to benzothiazyl disulfide is at least about 2 to 1, and about 20 to 50 percent plasticizer.
Dependencies are inferred from the claim text.