Siloxane polyphotoinitiators of the substituted acetophenone type
US4534838A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 27, 1984 |
| Grant date | Aug 13, 1985 |
| Priority date | — |
| Expiry date | Sep 27, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S522/904
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
An organopolysiloxane photoinitiator having an average of at least two siloxane units, of which at least an average of one siloxane unit per organopolysiloxane molecule has the formula: EQU X.sub.a R.sub.b SiO(.sub.4-a-b)/2 (I) wherein a is an integer of 1-3, b is an integer of 0-2 and a plus b equals 1-3; R is C.sub.1 -C.sub.10 hydrocarbyl or halogen substituted C.sub.1 -C.sub.10 hydrocarbyl; and X is a substituted acetophenone photomoiety selected from: ##STR1## where R.sup.1 is any substituent which will not interfere with hydrosilation, n is an integer between 0 and 5 in formulas (II), (IIa), (III), (IIIa), (IV) and (IVa) and between 0 and 4 in formula (III) and (IIIa); m is 0 or 1; R.sup.2 is alkyl or substituted alkyl; R.sup.3 is H, alkyl or aryl; R.sup.4 is a divalent hydrocarbon group having between 2 and 10 carbon atoms or an alkylene oxy alkylene group; R.sup.5 is a group selected from H, alkyl, aryl, organosilyl, or the reaction product of an isocyanate esterification reagent or an etherification reagent with the hydroxyl product formed when R.sup.5 is H and R.sup.6 is a trivalent hydrocarbon or hydrocarbon oxyhydrocarbon group. The silicones are prepared by hydrosilatio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.