The particular diisocyanate used and the particular triorganosilyl diamine employed could be various widely as most of the examples which have been given above indicate. Compounds of the final Formula VII have makes use of in making the polysilylureas of Formula IV and in the end polyureas of Formula V. in addition, they can be used to make polyimides of the type disclosed in Boldebuck et al. application Serial Number 359,928, filed concurrently herewith and assigned to the same assignee as the present software. Found, Theoretical, p.c % 6 manufactured by Du Pont).
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Included among such compositions used as beginning supplies are these having triorganosilyl piperazine substitutions during which all methyl groups are substituted by either all ethyl teams or by all phenyl teams. Example eight To illustrate the significance of the silyl substitution on the natural diamine, toluene-2,four-diisocyanate was reacted with para-phenylene diamine in the same manner as was described in Example 7. For solubility reasons, this reaction was carried out whereas the components were dissolved in N-methyl pyrrolidone.
Thus, one is able to make use of primarily the entire atoms in the polysilylurea within the formation of useful polyureas. It will in fact be obvious to these expert within the art that along with the conditions or intermediate ingredients which have been employed above for making the polysilylureas and the polyureas, different situations and ingredients can be employed without departing from the scope of the invention.
- The explicit diisocyanate used and the particular triorganosilyl diamine employed may be varied broadly as lots of the examples which have been given above point out.
- It will of course be apparent to those skilled within the artwork that in addition to the conditions or intermediate ingredients which were employed above for making the polysilylureas and the polyureas, different circumstances and elements can be employed with out departing from the scope of the invention.
- Although I don’t wish to be bound by this understanding, nevertheless, it is believed that a minimum of one of the terminal teams, whether it be a polysilylurea chain or a polyurea chain, is of the formulation Where one valence of the nitrogen is attached to the urea chain while the other valence of the nitrogen is satisfied by both a triorganosilyl group or a hydrogen atom, relying on whether one is dealing with a polysilylurea or a polyurea.
- Thus, one is able to make use of basically the entire atoms in the polysilylurea in the formation of useful polyureas.
With respect to Z alone, when it is a part of a cyclic radical containing the two nitrogen atoms, Z may be, for example, the divalent ethylene radical, both the methylene radical and the higher alkylene radicals, such because the pentamethylene radical when the two nitrogens are nearer collectively in the ring, etc. Furthermore, it must be recognized that m is 1 solely when the grouping of Formula III is acyclic, whereas in is zero, solely when the latter grouping is cyclic in nature. Where R is an arylene radical, any substituents thereon could be in any of the positions vicinal, symmetrical and asymmetrical to the valences of the arylene radical connected to the isocyanate radicals. The valences of the arylene group could also be diversified in ortho-, meta-, or para-positions with the metaor para-positions 7 being the preferred arrangement.
In order to type the polysilylurea, the diisocyanate is then reacted with the triorganosilylamine of Formula II using a molar ratio of about 1 mol of the triorganosilylamine per mol of the diisocyanate. There is thus obtained a solution of the specified polysilylurea which may be precipitated from the solvent by the addition of a non-solvent for the polysilylurea, corresponding to n-hexane.
(Cl. ) This invention is concerned with polysilylureas, their preparation, their conversion to polyureas, and intermediates used to make these polysilylureas. More notably the invention pertains to a process for making polysilylureas which comprises effecting reaction between a diisocyanate of the formulation OCNRNCO with a triorganosilylamine of the formula R3 S iN Z-N S iR Rllm R!!! where R is a divalent natural radical, R is a monovalent hydrocarbon radical, R is a member chosen from the class consisting of hydrogen and monovalent hydrocarbon radicals, and the grouping lTIZ-1TT- (R /I)m (RI/)m is a divalent natural radical chosen from the category consisting of organic radicals terminated by two nitrogen atoms with Z being a divalent natural moiety, and alicyclic radicals by which Z with the 2 nitrogens varieties a cyclic diamine construction, and m is an entire number from 0 to 1, in being zero only when the aforesaid grouping is alicyclic. The invention also includes polysilylureas of the formulation (IV o o e m tr 81B; R”,,, R”m SiRa x the place R, R, R”, Z and m have the meanings above and x is an entire quantity in excess of l, as an example from to 10,000 or extra and as high as a hundred,000 or higher; and the conversion of these polysilylureas to polyureas of the formula IiI R”m R” m H where again R, R”, Z, In and x have the meanings given above, the stated polyureas being formed by the hydrolysis of the polysilylurea to take away the -SiR teams to type the polyureas and disiloxanes of the method R’ OSiR’ the place R has the which means given above.
In maleing the triorganosilyl amines of Formula II, a molar ratio of a minimum of 2 and as much as 6 or more mols of the trihydrocarbon substituted hydrolyzable silane of. The triorganohydrolyzable silane, similar to, trimethylchlorosilane, is added to the diamino compound, in the presence of a hydrohalide acceptor such as, pyridine, triethylamine, etc. or some other tertiary amine often ends in an exothermic response with the temperature rising as excessive as 4070 C. The mixture of ingredients is advantageously stirred for a interval of from about one half to two hours and thereafter heated on the reflux temperature of the mass for a further period of 15 minutes to 1 hour and the hydrohalide of the hydrohalide acceptor is then filtered off and the reaction product thereafter fractionally distilled to acquire the desired triorganosilyl amine of Formula II.
This polymer when dried beneath vacuum underneath anhydrous circumstances, was a polysilylurea composed of recurring items of the formula. The formation of the polyurea containing fewer silyl groups than the beginning polysilylurea, or a polyurea utterly free of silyl groups, may be achieved by exposing the polysilylurea to air, preferably of from 70 to relative humidity. This results hydrolysis of the triorganosilyl groups to form the corresponding disiloxane with the substitution of a hydrogen atom instead of the triorganosilyl group on a nitrogen atom. Where the polysilylurea is pretty thick in cross-part, the scission of the triorganosilyl groups by hydrolysis is extra rapid on the surface than within the matrix of the polysilylurea article.
Washing the solutions of the polys’ilylurea with Water will elTect essentially full removal of the triorganosilyl groups. After hydrolysis with the moisture or water-containing environment, the disiloxane is removed from the polyurea by washing with appropriate solvents or by heating at temperatures high sufficient to volatilize the disiloxane.
The triorganosilyl diamines of Formula II could be ready by reacting a diamine of Formula VIII with a triorganohydrolyzable silane of the formula the place R, R, Z, and 111 have the meanings given above, and X is a halogen, for instance, chlorine, bromine, fluorine, and so forth. Among the triorganohydrolyzable silanes which can be employed are, as an example, trimethylchlorosilane, triphenylchlorosilane, methyldiethylbromosilane, tritolylbromosilane, triethylchlorosilane, tribenzylchlorosilane, etc. By coming into this site you swear that you are of authorized age in your space to view grownup material and that you simply want to view such material.All porn movies and pictures are property and copyright of their homeowners.All models showing on this website have been 18 years or older on the time the movies has been produced. XVideos.com – the most effective free porn videos on web, one hundred% free. A composition of matter having the method Where R is a monovalent hydrocarbon radical and Q is a divalent aryl radical selected from the category consisting of phenylene, xenyl, diphenylene oxide, and diphenylene alkanes of the formulation Where R’ is a divalent alkyl radical.