Compositions based on derivatives of silica modified by organic

Details Compositions based on derivatives of silica modified by organic Compositions based on derivatives of silica modified by organic

1988-04-28

1990-05-08

Marquis, Melvyn I.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From silicon reactant having at least one...

528 30, 528 39, 556413, 556424, 556427, 556450, 556459, C08G 7726

Patent

active

049239503

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to new compositions based on silica derivatives modified by organic groups, to their preparation and to their use.
The compositions of the invention comprise polymerized gels which are in the form of amorphous solids similar to glasses.
It is known that the optical industry constantly needs to expand the selection of glasses which it is likely to use. Among the glasses which are presently being researched, mixed organic-inorganic compositions which can be obtained in the solid state and form light glasses can, in particular, be mentioned.
In addition, there is a known interest in solid ionic conductor materials, particularly for the production of electric accumulators and batteries or of completely solid specific activity gauges, or even in the production of electrochrome sensors and systems.
It is known that, apart from microelectronics, a branch of technology, called "micro-ionic", is presently being created which develops the possibilities of miniaturization of devices using the electrochemical transport of ions in ionic conductors, with a view to producing micro-sensors, micro-analyzers, micro-batteries, or read-outs, for example.
Until now, the ionic conductors proposed for these uses were principally crystalline or vitro-ceramic products whose use raised difficulties in practice. In effect, it is known that the crystallized products have expansion anomalies which render their use difficult. In addition, ceramics have a heterogeneous structure which is characterized in particular by grain boundaries which affect the electrical and mechanical properties and which decrease the life span of the system using them as solid electrolytes.
The interest in solid amorphous ionic conductors can therefore be conceived, especially since their preparation starting from gels easily enables them to be obtained in the form of thin layers.
The present invention relates to new solid amorphous and homogeneous compositions, which can be used in particular in the optical, electro-optical and electrochemical industries.
More specifically, the present invention relates to new compositions based on derivatives of silica modified by organic groups, wherein said derivatives are amorphous solids of the formula I ##STR1## wherein R.sup.1 is alkylene having 3 to 8 carbon atoms optionally interrupted by --NH--, and R.sup.3 and R.sup.4 each represent --H or together represent a --CH.dbd.CH--N.dbd.CH-- group; having 3 to 8 carbon atoms optionally interrupted by --NH--; representing a valence of a metal), the said acid or said salt being soluble in water; zero and less than or equal to 1;
It can be seen that, in formula I, when R.sup.3 and R.sup.4 together represent --CH.dbd.CH--N.dbd.CH--, --N(R.sup.3)(R.sup.4) is an imidazolyl group.
The base product polymer. It can therefore be seen that in formula I, on average, each silicon atom is connected to x chains ##STR2## and y chains --R.sup.2 --SO.sub.3 H. In the silica derivative of formula I, due to the tetravalence of the silicon, each silicon atom is therefore on average involved in 2-0.5(x+y) bonds of the Si--O--Si type. The XA acid or salt is solvated in the modified silica polymer.
Of course, the silica-derived polymers represented by general formula I can, like silica xerogels, contain a small amount of hydroxyl end groups. This is shown by the method of preparation of the compounds of formula I which will be detailed below.
The invention relates in particular to the products of formula I for which the sum (x+y) is at least equal to 0.5 and especially to those for which x is at least equal to 0.5.
Among the products of formula I, those for which the ratio (z+y)/x is a number which can vary from 0.01 to 0.5 can particularly be cited.
Where R.sub.1 does not contain a nitrogen heteroatom, this ratio is preferably less than or equal to 0.2 and can in particular vary from 0.05 to 0.2.
Where R.sub.1 contains an --NH-- heteroatomic group, said ratio is preferably less than or equal to 0.4 and can in particular vary from 0.1 to 0.4.
In particular embodiments

REFERENCES:
patent: 2921950 (1960-01-01), Jex et al.
patent: 4238590 (1980-12-01), Scholze et al.
patent: 4374696 (1983-02-01), Schmidt et al.

Affiliated with

Also associated with

Rating

Compositions based on derivatives of silica modified by organic does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Compositions based on derivatives of silica modified by organic , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Compositions based on derivatives of silica modified by organic will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2349844