Polythiourethane

Details Polythiourethane Polythiourethane

C - Chemistry, Metallurgy

08

G

C08G 18/64 (2006.01) G02B 1/04 (2006.01)

Patent

CA 2564892

Disclosed is a polythiourethane having high refractive index and low dispersibility which is obtained through a reaction between a polythiol component containing one or more polythiocarbonate polythiol (preferably one having a -(CO-S-R-S)- structure (wherein R represents a divalent hydrocarbon group) and a number average molecular weight of 200-2,500) and a polyisocyanate component containing a polyisocyanate and/or a polyisothiocyanate. This polythiourethane is useful for plastic lenses, prisms, optical fibers, substrates for information recording, colored filters, infrared absorbing filters and the like.

Il est prévu un polythiourethane ayant un indice de réfraction élevé et une faible dispersibilité que l~on obtient par réaction entre un composant polythiol contenant un ou plusieurs polythiols de polythiocarbonate, (de préférence un élément ayant une structure (CO-S-R-S) (où R représente un groupe hydrocarbure divalent) et un poids moléculaire moyen de 200 à 2.500) et un composant de polyisocyanate contenant un polyisocyanate et/ou un polyisothiocyanate. Ce polythiouréthane sert pour les lentilles plastiques, les prismes, les fibres optiques, les substrats pour enregistrer des informations, les filtres colorés, les filtres absorbant l~infrarouge et autres.

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