Photoinitiator mixtures and compositions with alkylphenylbisacylphosphine oxides

US6361925B1 · kind B1 · utility

Assignee

• Ciba Specialty Chemicals Corporation · US

Inventors

• David G. Leppard · Marly, CH
• Manfred Kohler · Bulle, CH
• Andreas Valet · Lörrach, DE

Key dates

• Filing date: May 18, 2001
• Grant date: Mar 26, 2002
• Expiry date: May 18, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S522/908
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula I in which R1 is C1-C4alkyl, R2 is hydrogen, C1-C4alkyl or C1-C4alkoxy and R3, R4, R5, R6 and R7 independently of one another are hydrogen, halogen, C1-C20alkyl, cyclopentyl, cyclohexyl, C2-C12alkenyl, C2-C18alkyl which is interrupted by one or more oxygen atoms, or are phenyl-substituted C1-C4alkyl, or are phenyl which is unsubstituted or is mono- or disubstituted by C1-C4alkyl and/or C1-C4alkoxy, with the provisos that at least one of the radicals R3, R4, R5, R6 and R7 is other than hydrogen and that, if R1 and R2 are methyl, R3 and R6 are not methyl, and mixtures of such compounds with &agr;-hydroxy ketones, benzophenones and &agr;-amino ketones, are suitable as photoinitiators.