Photocurable polyene-polythiol polymers using a phosphine plus an additional sensitizer
Abstract
Abstract THIS INVENTION RELATES TO ACCELERATED CURING OF A COMPOSITION COMPRISING A POLYENE CONTAINING AT LEAST TWO REACTIVE UNSATURATED CARBON TO CARBON BONDS PER MOLECULE AND A POLYTHIOL CONTAINING AT LEAST TWO THIOL GROUPS PER MOLECULE, THE TOTAL COMBINED FUNCTIONALITY OF (A) THE REACTIVE UNSATURATED CARBON TO CARBON BONDS PER MOLECULE IN THE POLYENE AND (B) THE THIOL GROUPS PER MOLECULE IN THE POLYTHIOL BEING GREATER THAN FOUR, IN THE PRESENCE OF A PHOTOSENSITIZER AND A NOVEL CLASS OF SYNERGISTIC AGENTS FROM THE CONSISTING OF (1) PHOSPHINES OF THE FORMULA R1-P(-R2)-R3 WHEREIN R1, R2 AND R3 ARE EACH INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL, ALKARYL AND ALKOXY AND (2) PHOSPHITES OF THE FORMULA R4-O-P(-O-R5)-O-R6 WHEREIN R4, R5 AND R6 ARE EACH INDEPENDENTLY SELECTED FROM THE GROUP CONSISTING OF ALKYL, ARYL AND ALKARYL, SAID ALKYLS CONSISTING 1-2 CARBON ATOMS. THE CURING TAKES PLACE IN THE PRESENCE OF A FREE RADICAL GENERATOR, PREFERABLY ACTINIC RADIATION, E.G., UV LIGHT.
Inventors
- 👤 C Morgan
Bibliographic Details
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