摘要:
Surfaces containing hydroxyl groups are rendered water-repellent through exposure to hydridoaminosilanes of the general formulaH.sub.x Si(NRH).sub.y (NR.sub.2.sup.1).sub.3-yIn particular, tris(dimethylamino)silane and its derivatives have been found to make substrates with hydroxyl-containing surfaces hydrophobic without adversely effecting the physical properties of the substrate being treated and without the necessity of and pre- or post-treatment steps (i.e. moisturizing, neutralizing, etc.).
摘要:
A method of preparing silazane polymers, with 3 or more repeating units, of the general formula--((CH.sub.3).sub.2 N).sub.e Si(R).sub.a (R'HN).sub.f H.sub.c (NR').sub.g --and a (CH.sub.3).sub.2 NH byproduct group where R is hydrogen, an alkyl group having 1-6 carbon atoms or an aryl group having 6-12 carbon atoms, a=0, or 1, b=2-4, C=0-2, d=0 or 1, e=0-2, f=0-2, g=1-3 and a+c+e+f+g=4 for the polymer units; and R' is hydrogen or methyl, whereby the silazane polymer is substantially free of halide impurities, and wherein this method comprises:transaminating an aminosilane of the general formula (R).sub.a ((CH.sub.3).sub.2 N).sub.b H.sub.c S; where R is defined as above and a+b+c=4 with an amine of the general formula (CH.sub.3).sub.d NH.sub.3-d whereby d is defined as above and the amine has a molecular weight lower than 45 all in the presence of an acid catalyst or the ammonium salt of the acid and thereafter condensing to form the polymer.
摘要翻译:制备具有3个以上重复单元的具有通式 - ((CH 3)2 N)e Si(R)a(R'HN)fHc(NR')g - 和(CH 3)2 NH副产物基团)的硅氮烷聚合物的方法 其中R是氢,具有1-6个碳原子的烷基或具有6-12个碳原子的芳基,a = 0或1,b = 2-4,C = 0-2,d = 0或1, 对于聚合物单元,e = 0-2,f = 0-2,g = 1-3和a + c + e + f + g = 4; 并且R'是氢或甲基,由此硅氮烷聚合物基本上不含卤化物杂质,并且其中该方法包括:将通式(R)a((CH 3)2 N)b H c S的氨基硅烷转氨酸; 其中R如上所定义,a + b + c = 4与通式(CH3)dNH3-d的胺反应,其中d如上定义,胺在酸存在下全部分子量低于45 催化剂或酸的铵盐,然后冷凝形成聚合物。
摘要:
Silyl carbamates are produced by the reaction under suitable reaction conditions of silanes bearing at least one silicon-hydrogen bond of the formula: R.sub.4-x SiH.sub.x with an ammonium carbamate of the formula: R'R"NH.sub.2.sup..sym. R'R"NCO.sub.2.sup..crclbar.. This novel route is much simpler and more direct than those previously known and provides a new classes of silyl carbamates.
摘要:
Triacetoxysilanes are prepared by adding a tris(amino)silane to acetic anhydride and maintaining the reaction mix at a temperature no greater than about 50.degree. C.
摘要:
A hydrogen bearing silyl carbamate of the general formula:HSiR.sub.n (O.sub.2 CNR'R").sub.3-nis synthesized from hydrogen bearing aminosilane and gaseous carbon dioxide. The resulting hydrogen bearing silyl carbamate is novel in the single hydrogen attached to the silyl carbamate and represents a major new compound for creating novel compositions of matter.
摘要:
A process whereby silanes of the general formula:HSi(NRR').sub.x (R").sub.3-xwherein R, R' and R" are independently an aliphatic or aromatic, substituted or unsubstituted, saturated or unsaturated hydrocarbon radical having from one to eight carbon atoms, inclusive and R and R' may also be hydrogen and where R" may also be alkoxy and where x has a value from one to three are reacted in the presence of a catalyst with alcohols in the stoichiometry of approximately one equivalent of alcohol per mole of silicon-nitrogen bond to give unexpectedly high yields of alkoxyhydridosilanes. In the reaction the silyl amine groups have been replaced by alkoxide groups without significant loss of the silicon-hydrogen group. Similar reactions in the absence of a catalyst give undesirably low yields of the corresponding alkoxy silanes and, in most cases, substantial loss of silyl hydrogen groups.
摘要:
A process whereby silanes of the general formulaHSi(NRR.sup.I).sub.x (R.sup.II).sub.3-xare reacted in the presence of a catalyst with oximes or hydroxylamines in the stoichiometry of approximately one equivalent of oxime or hydroxylamine per mole of silicon-nitrogen linkage to give unexpectedly high yields of substituted silanes.
摘要:
A sunscreen composition containing a UV-A dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL.RTM. 1789), and a stabilizer/solubilizer for the dibenzoylmethane derivative having formula (I): ##STR1## wherein m=5, 7, 9 or mixtures and n=4, 6, 8 or mixtures; These long branched chain alkyl salicylates having a C.sub.4.sup.+ branch at the 2 position are quite effective in stabilizing the dibenzoylmethane derivative UV-B filter compounds making them more effective; effective for longer periods of time.
摘要:
A sunscreen composition containing a UV-B dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl)-4′-methoxydibenzoylmethane (PARSOL 1789), and a stabilizer/solubilizer for the dibenzoylmethane derivative selected from formula (I) and formula (II), and mixtures thereof: wherein m=5, 7, 9 or mixtures and n=4, 6, 8 or mixtures; wherein p1 m=5, 7 or mixtures and n=4, 6 or mixtures. These long branched chain alkyl hydroxybenzoates and long branched chain benzoates having a C4+ branch at the 2 position are quite effective in stabilizing the dibenzoylmethane derivative UV-B filter compounds making them more effective; effective for longer periods of time.
摘要:
A sunscreen composition containing a UV-B dibenzoylmethane derivative, such as 4-(1,1-dimethylethyl)-4'-methoxydibenzoylmethane (PARSOL 1789), and a stabilizer/solubilizer for the dibenzoylmethane derivative selected from formula (I) and formula (II), and mixtures thereof: ##STR1## wherein m=5, 7, 9 or mixtures and n=4, 6, 8 or mixtures; ##STR2## wherein m=5, 7 or mixtures and n=4, 6 or mixtures. These long branched chain alkyl hydroxybenzoates and long branched chain benzoates having a C.sub.4.sup.+ branch at the 2 position are quite effective in stabilizing the dibenzoylmethane derivative UV-B filter compounds making them more effective; effective for longer periods of time.