Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From silicon reactant having at least one...
Reexamination Certificate
1998-10-16
2002-04-02
Moore, Margaret G. (Department: 1712)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From silicon reactant having at least one...
C528S032000, C528S010000, C528S037000, C528S033000, C556S430000
Reexamination Certificate
active
06365698
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to silicon-containing polymers, especially grafted polysilanes useful as photoinitiators having enhanced photoinitiation properties for vinyl type resins and a process for preparing them.
BACKGROUND OF THE INVENTION
A lot of organic compounds which generate radicals upon exposure to, for example, ultraviolet light are known as photoinitiators for vinyl type resins. Among them are included polymeric ones, including not only those having advantages such as being superior in the compatibility with vinyl type resins with which they are to be combined, but also those generating only small amounts of radicals and those poor in the compatibility with resins to be crosslinked using them. Thus, a new type of photoinitiators are desired inevitably.
Further, polyorganosiloxanes and acrylic resins are in wide use as adhesives and potting agents for electronic devices and components. Many of them are of the type which undergoes crosslinking upon exposure to light, and photoinitiators suitable for them are keenly desired.
OBJECT OF THE INVENTION
It is an object of the present invention to provide novel silicon-containing polymers useful as a new type of photoinitiators, as well as precursors thereof and a process for preparing them.
SUMMARY OF THE INVENTION
The present inventors succeeded in the preparation of grafted polysilanes which possess enhanced photoinitiation properties for vinyl type resins.
The novel grafted polysilanes which include both grafted cyclic polysilanes and grafted networked polysilanes may have various grafted chains on the silane backbone. The chains to be grafted on the silane backbone can be selected widely from those having various compositions and molecular lengths so as to have a good compatibility with a particular vinyl type resin.
The grafted polysilane of the present invention is produced by firstly producing a polysilane by utilizing either a Wultz reaction or a metallocene reaction, and then grafting a grafting compound onto the polysilane by utilizing either a hydrosilation reaction, a condensation reaction or a catalysis reaction.
In the present invention, the term “polymer” is used in the sense of including both oligomer and polymer.
REFERENCES:
patent: 4645807 (1987-02-01), Seyferth et al.
patent: 5204381 (1993-04-01), Zeigler
patent: 5426160 (1995-06-01), Bianconi et al.
patent: 5750588 (1998-05-01), Takeoka et al.
Grant & Hackh's Chemical Dicationary, p. 112,1987.*
Kirk-Othmer: Encyclopedia of Chemical Technology, vol. 20, 3rd ed., p. 930, 1982.
Clarson Stephen J.
Goldslager Barry
Frost Brown Todd LLC
Moore Margaret G.
Three Bond Co. Ltd.
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