摘要:
β-ketocarbonyl-functional organosilicon compounds are prepared by reacting amino organo-functional organosilicon compounds with a diketene in the presence of a compound which inhibits the reaction of amine groups with β-ketocarbonyl compounds.
摘要:
Hydroxyl-terminal organopolysiloxanes having diorganylsiloxy [diorganosiloxy ??] groups and Si—H groups are prepared by reacting the appropriate chlorosilanes with less than 0.5 mol water per mol of hydrolyzable chlorine in a first step and recovering gaseous HCl, and more fully hydrolyzing with additional water in a second step.
摘要:
Emulsions of highly viscous organopolysiloxanes are prepared by reacting organopolysiloxanes having at least one Si—OH group with alkoxysilanes bearing a group BReSi(OR3)3-e wherein R is a hydrocarbon radical and B is a radical —CR22—Y where Y is halogen, monosubstituted O or S or substituted N or P, the reaction taking place as a dispersion in water, optionally in the presence of an emulsifier.
摘要:
Highly branched alkenyl-functional organopolysiloxane polymers are highly efficient antimisting additives for use in the preparation of silicone release coatings in high speed coating operations. The antimisting additives are miscible with the crosslinkable silicone coating components and produce storage stable compositions which can be used to provide coatings with good release properties.
摘要:
Antimisting additives are used in crosslinkable silicone coating compositions for reducing aerosol formation, the antimisting additives being alkenyl-functional siloxane copolymers prepared by reacting a hydrocarbon containing at least three aliphatic double bonds, and with an organosiloxane (2) having terminal Si-bonded hydrogen atoms in the presence of a hydrosilylation catalyst (3) at a ratio of Si-bonded hydrogen to aliphatic double bonds of from 1.3 to 10, and subsequently reacting the resulting SiH-containing hydrocarbon-siloxane copolymer with an &agr;,&ohgr;-dialkenylsiloxane polymer (4) in the presence of a hydrosilylation catalyst (3) at a ratio of aliphatic double bonds to Si-bonded hydrogen of from 1.2 to 10, and optionally, in another step, equilibrating the resulting alkenyl-functional siloxane copolymers with an organopolysiloxane (5).
摘要:
Branched organosiloxane (co)polymers comprising the structural elements of the formula Y[—CnH2n—(R2SiO)m—Ap—R2Si—G]x (I) where Y is a tri- to decavalent, optionally heteroatom-containing hydrocarbon radical, R is a monovalent, optionally halogenated hydrocarbon radical, A is a radical of the formula —R2Si—R2—(R2SiO)m—, in which R2 is a divalent hydrocarbon radical, G is a monovalent radical of the formula —CfH2f−2—Z or a divalent radical of the formula —CnH2n— bonded to a further radical Y, Z is a monovalent hydrocarbon radical which is free from terminal aliphatic carbon-carbon multiple bonds, and is inert toward SiH groups in hydrosilylation reactions, x is an integer from 3 to 10, f is an integer from 2 to 12, k is 0 or 1, n is an integer from 2 to 12, m is an integer which is at least 1, and p is 0 or a positive integer, with the proviso that the branched organosiloxane (co)polymers contain on average at least one group Z.
摘要翻译:包含式(Ⅳ)的结构元素的支链有机硅氧烷(共)聚合物是三价至十价,任选含杂原子的烃基,R是一价的,任意卤代的烃基,A是式-R 2 Si-R的基团, 2 - (R 2 SiO)m - ,其中R 2是二价烃基,G是式-CfH 2 F-2-Z的一价基团或式-C n H 2n的二价基团键合到另外的基团 Y,Z是不含末端脂肪碳 - 碳多键的单价烃基,在氢化硅烷化反应中对SiH基团呈惰性,x为3至10的整数,f为2至12的整数,k为 0或1,n是2至12的整数,m是至少为1的整数,p是0或正整数,条件是支链的有机基硅氧烷(共)聚合物平均包含至少一个基团 Z.
摘要:
The invention provides alkenyl-containing siloxane copolymers preparable by reacting: a compound (1) having at least three aliphatic double bonds, of the general formula R2(CR3═CH2)x where R2 is a trivalent or tetravalent hydrocarbon of silane radical, and R3 is a hydrogen atom or an alkyl radical, with an organosiloxane having terminal Si-bonded hydrogen atoms, in the presence of a hydrosilylation catalyst, in a second step reacting: the resulting hydrocarbon-siloxane copolymers containing Si-bonded hydrogen atoms with &agr;,&ohgr;-dialkenylsiloxane polymer in the presence of a hydrosilylation catalyst, and, if desired, in a third step, equilibrating: the resulting alkenyl-containing siloxane copolymers with an organopolysiloxane from the group consisting of linear organopolysiloxanes containing terminal triorganosiloxy groups, linear organopolysiloxanes containing terminal hydroxyl groups, branched organopolysiloxanes with or without hydroxyl groups, cyclic organopolysiloxanes, and copolymers of dioganosiloxane units and monoorganosiloxanes units.
摘要:
The invention relates to novel polymeric organosilicon compounds comprising hydrocarbon radicals with at least one aliphatic carbon-carbon double bond in a terminal position. To produce these compounds, (A) compounds containing at least one aliphatic carbon-carbon double bond per molecule, in a terminal position, are reacted with (B) oligomeric or polymeric organosilicon compounds containing units of the general formula R1R2SiO1/2 and units of the general formula HRSiO and/or HSiO3/2 and possibly units of the general formula R2SiO, where R is a monovalent, possibly substituted, hydrocarbon radical with between 1 and 18 carbon atoms per radical, which is free of aliphatic carbon-carbon double bonds, and R1 is a monovalent hydrocarbon radical with between 1 and 18 carbon atoms per radical which has at least one aliphatic carbon-carbon double bond in a terminal position, subject to the condition that the sum of the units HRSiO and R1R2SiO1/2 on average is greater than 2.0 if (B) contains no HSiO3/2 units, and the number of R1 radicals per molecule is greater than the number of Si-bonded hydrogen atoms, in the presence of (C) catalysts promoting the addition of Si-bonded hydrogen to aliphatic double-bonds. The ratio of aliphatic double bonds in components (A) and (B) to Si-bonded hydrogen in component (B) is between 1.5 and 10, subject to the condition that the polymeric organosilicon compounds on average contain more than two hydrocarbon radicals with at least one aliphatic carbon-carbon double bond in a terminal position.
摘要:
Compositions obtained by mixing oxygen-containing phosphazenes with tertiary alcohols at a temperature of from 0.degree. C. to 70.degree. C. and a pressure of from 900 to 1100 hPa are useful in processes for equilibrating and/or condensing organosilicon compounds.
摘要:
The present invention relates to siloxane copolymers containing vinyloxy groups and a method of preparing the siloxane copolymers. The copolymers of the present invention are useful for the production of coatings which can be crosslinked by light and radiation-curable printing inks.