摘要:
High-molecular-weight siloxane polymers are prepared in a multi-step process wherein an Si—H functional linear siloxane containing silanol groups is reacted with a hydrosilylatable organic compound, and the product is then condensed.
摘要:
Compositions comprising (A) an organosilicon compound of the formula Ra(R1O)bR2cSiO(4-a-b-c)/2 (I) in which R2 independently denotes a monovalent, SiC-bonded, optionally substituted, aliphatic cyclic or aliphatic branched hydrocarbon radical having at least 3 carbon atoms, R, and R1 are hydrogen or hydrocarbon radicals, the sum a+b+c≦3, the organosilicon compound has at least one unit of the formula (I) with c other than 0, and in at least 50% of all of the units of the formula (I) in the organosilicon compound the sum a+b+c is 2; at least one additive (B) selected from (B1) filler particles and/or (B2) organopolysiloxane resin(s) and optionally (C) an organosilicon compound which has units of the formula (III), R5g(R6O)hSiO(4-g-h)/2 where R5 and R6 are hydrogen or a hydrocarbon radical, g+h≦3 and in at least 50% of the units (III), g+h=2, are highly effective and long lasting defoamers.
摘要翻译:包含(A)式的有机硅化合物(?)在线公式描述=“在线公式”末端=“引线”→Ra(R1O)bR2cSiO(4-abc)/ 2(I) in-line-formula description =“In-line Formulas”end =“tail”?>其中R2独立地表示具有至少3个碳原子的单价SiC键合的任选取代的脂族环状或脂族支链烃基,R 并且R1是氢或烃基,并且a + b + c <3,有机硅化合物具有至少一个式(I)的单元,c不为0,至少有50% 有机硅化合物中式(I)的单位和a + b + c为2; 至少一种选自(B1)填料颗粒和/或(B2)有机聚硅氧烷树脂的添加剂(B)和(C)具有式(III)单元的有机硅化合物, 描述=“在线公式”end =“lead”?> R5g(R6O)hSiO(4-gh)/ 2 <?in-line-formula description =“In-line Formulas”end =“tail”?> where R5和R6是氢或烃基,g + h <3,并且在至少50%的单元(III)中,g + h = 2是高效和持久的消泡剂。
摘要:
Organosilicon compounds containing at least one silicon-bonded radical of the formula (E1)xZ-Y—C(O)—CR4═C(CH2R4)—NR2—R1— are prepared by reacting the analogous ketoester or tautomer thereof with an amino functional organosilicon compound.
摘要:
β-ketocarbonyl-functional organosilicon compounds are prepared by reacting,organosilicon compounds containing an SiC-bonded organic radical having a primary amino group, withorganic ester compounds containing a group of the formula —O—C(═O)— and, reacting the product with diketenes or diketene derivatives, to produce β-ketocarbonyl-functional organosilicon compounds containing at least one SiC-bonded radical of the formulae —R1{—N[C(═O)—CHR5—C(═O)—CH2R5]—R1}x—NH—C(═O)—(O)y—R4{—O—[C(═O)—CHR5—C(═O)—CHR5]yH}z or —R1(—NR2—R1)x—NH—C(═O)—(O)y—R4{—O—[C(═O)—CHR5—C(═O)—CHR5]yH}z R1 is a divalent C1-18 organic radical R2 is a hydrogen atom or a monovalent C1-18 organic radical, R5 is hydrogen, v is 1, x is 0 or an integer from 1 to 10, R2′ has one of the meanings of R2 with the proviso that R2′ is not a hydrogen atom, y is 0 or 1, and z is 1 or 2.
摘要:
Organosilicon compounds containing urethane groups are prepared by reacting aminofunctional organosilicon compounds containing at least one siloxane unit AR a SiO 3 - a 2 ( I ) per molecule and at least two siloxane units of the formula XR b SiO 3 - b 2 ( II ) in which R are monovalent, optionally substituted C1-18 hydrocarbon radicals, A is a radical —R1(—NR2—R1)z—NR2—H, (III) where R1 is a divalent C1-18 organic radical, R2 is a hydrogen atom or C1-18 hydrocarbon radical, X is a group capable of condensation, a is 0 or 1, b is 1 or 2, z is 0 or an integer from 1 to 10, are reacted with organic carbonates (2) containing a group of the formula —O—C(═O)O—, (IV) and, in a second stage, the first stage reaction products are optionally condensed with silanes (3) bearing groups capable of condensation, to give higher molecular weight organosilicon compounds containing urethane groups.
摘要:
An antifoam formulations comprise (A) antifoam agent based on siloxanes and (B) branched polyether/polysiloxane copolymers comprising structural units of the formula Y[—CnH2n—(R2SiO)m—Ap—R2Si—G]x (I) in which Y is a multivalent, optionally heteroatom-containing hydrocarbon radical, R are monovalent optionally halogenated hydrocarbon radicals, A is a radical —R2Si—R2—(R2SiO)m—, G is a monovalent radical —CfH2f-2k—Z or a divalent radical —CnH2n— bonded to a radical Y, Z —(R6)v—(OCH2CH2)a[OCH2CH(CH3)]b[OCH2CH(CH2CH3)]c—OR3, in which R3 is hydrogen, a hydrocarbon radical, or a radical R—C(O)—, R6 is a divalent hydrocarbon radical, v is 0 or 1, a, b and c are 0 or an integer between 1 and 1000, the sum (a+b+c) being from 2 to 2000, x is 3 to 10, f is 2 to 12, k is 0 or 1, n is 2 to 12, m is at least 1, and p is 0 or a positive integer, the branched polyether/polysiloxane copolymers (B) containing on average at least one group Z.
摘要:
Silicone-containing polymers having numerous uses are prepared by polymerizing one or more ethylenically unsaturated monomers in the presence of a branched organopolysiloxane having at least one lipophilic branched siloxane portion and at least one optionally branched hydrophilic portion.
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:
The invention relates to novel aqueous compositions containing (1) organosilicon compounds comprising ammonium groups, containing at least one grouping consisting of two protonated nitrogen atoms per molecule, said atoms being linked by at least three carbon atoms, (2) acid anions, the corresponding acids thereof having a pka value higher than 0, (3) water, (4) optionally a solvent which can be mixed with water, and (5) optionally emulsifying agents. Said aqueous compositions are preferably homogeneous aqueous solutions.
摘要:
The present invention relates to crosslinkable compositions are described, containing (1) organosilicon compounds which have radicals containing aliphatic carbon-carbon multiple bonds, and (2) organosilicon compounds having Si-bonded hydrogen atoms, or (3) organosilicon compounds where radicals with aliphatic carbon-carbon multiple bonds and Si-bonded hydrogen atoms are present in the same compound, (4) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic multiple bond, and (5) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bond at room temperature, of the formula ##STR1## in which R.sup.1, R.sup.2, R.sup.4, R.sup.5 and R.sup.6 are identical or different and are a hydrogen atom or a monovalent, substituted or unsubstituted hydrocarbon radical having 1 to 12 carbon atoms per radical,R.sup.3 is a divalent hydrocarbon radical having 1 to 6 carbon atoms per radical, X is a radical of the formula --OH, --Cl, Br and --CN, and x and y are identical or different and are 0 or 1, with the proviso that there is at least one double bond.