摘要:
Crosslinkable silicone coating compositions are prepared from (1) organopolysiloxanes containing alkenyl groups and containing per molecule at least one unit O3-n/2RnSi—Y(SiRnO3-n/2)a (I), at least 2 units R1RbSiO(3-b)/2 (II), and units RcSiO(4-c)/2 (III), where R is a monovalent, SiC-bonded organic radical having 1 to 30 C atoms free from aliphatic carbon-carbon multiple bonds, R1 is an alkenyl radical having 2 to 4 C atoms, and Y is a divalent or trivalent organic radical having 1 to 30 C atoms, with the proviso that the organopolysiloxanes (1) contain units (II) in amounts wherein the concentration of alkenyl radicals R1 is less than 2 meq/g, (2) organopolysiloxanes containing Si-bonded hydrogen atoms, (3) a hydrosilylation catalyst, and (4) optionally, inhibitors. The compositions cure rapidly with few extractables and are very useful in preparing release coatings.
摘要:
The invention relates to organopolysiloxane compounds containing per-molecule at least one structural unit of general formula (I) O3-a/2RaSi—Y(SiRaO3-a/2)b, wherein R can be identical or different and represents an organic monovalent SiC-bonded group which comprises from 1 to 30 carbon atoms and can contain one or several O atoms, a is 0 or 1 and b is an integer number ranging from 1 to 11.
摘要翻译:本发明涉及含有每分子至少一个通式(I)O 3-a / 2RaSi-Y(SiRaO 3-a / 2)b的结构单元的有机聚硅氧烷化合物,其中R可以相同或不同,表示有机单价SiC 包含1至30个碳原子并且可以含有一个或几个O原子的键合基团,a是0或1,b是1至11的整数。
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, alkenyl-functional organopolysiloxanes prepared by reacting an organic compound having at least two aliphatic double bonds with an organopolysiloxane having more than one Si-bonded hydrogen atom, in the presence of a hydrosilylation catalyst, and in a stoichiometric ratio of aliphatic double bonds to Si-bonded hydrogen such that an alkenyl-functional product is obtained, function as highly effective antimisting additives in the high speed coating of substrates with crosslinkable silicone compositions.
摘要:
Branched, alkenyl-functional organopolysiloxanes prepared by reacting an organic compound having at least two aliphatic double bonds with an organopolysiloxane having more than one Si-bonded hydrogen atom, in the presence of a hydrosilylation catalyst, and in a stoichiometric ratio of aliphatic double bonds to Si-bonded hydrogen such that an alkenyl-functional product is obtained, function as highly effective antimisting additives in the high speed coating of substrates with crosslinkable silicone compositions.
摘要:
Branched organosilicon compounds bearing aliphatic multiple bonds, prepared by reacting a branched organosilicon compound having Si-bonded hydrogen atoms with an organosiloxane or organopolysiloxane having terminal aliphatic multiple bonds and optionally equilibrating with further organopolysiloxanes are useful as antimisting additives in the high speed coating of substrates with crosslinkable silicone compositions.
摘要:
An organopolysiloxane compound containing per molecule at least one structural unit of the general formula O3-a/2RaSi—Y(SiRaO3-a/2)b (I) where R can be identical or different and denotes a monovalent SiC-bonded organic radical which has 1 to 30 C atoms and may contain one or more N and/or O atoms, Y is a divalent to dodecavalent organic radical which has 1 to 30 C atoms and may contain one or more O atoms, a is 0 or 1, and b is an integer from 1 to 11.
摘要翻译:每分子含有至少一个通式O 3-a / 2RaSi-Y(SiRaO 3 -a / 2)b(I)的结构单元的有机聚硅氧烷化合物,其中R可以相同或不同,表示一价SiC键合的有机基团, 具有1至30个C原子并且可以含有一个或多个N和/或O原子,Y是具有1至30个C原子并且可以含有一个或多个O原子的二价至十价有机基团,a为0或1,以及 b为1〜11的整数。
摘要:
Branched organosilicon compounds bearing aliphatic multiple bonds, prepared by reacting a branched organosilicon compound having Si-bonded hydrogen atoms with an organosiloxane or organopolysiloxane having terminal aliphatic multiple bonds and optionally equilibrating with further organopolysiloxanes are useful as antimisting additives in the high speed coating of substrates with crosslinkable silicone compositions.
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 α,ω-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:
Crosslinkable compositions prepared from (A) organopolysiloxanes containing alkenyl groups, of the general formula MVia Tb Dc DVid Me (I) where Mvi is a unit of the formula R1R2SiO1/2, T is a unit of the formula RSiO3/2, D is a unit of the formula R2SiO, Dvi is a unit of the formula R1RSiO, and M is a unit of the formula R3SiO1/2, R are monovalent, SiC-bonded, optionally substituted C1-18 hydrocarbon radicals free from aliphatic unsaturation, and R1 are monovalent, SiC-bonded C2-8 hydrocarbon radicals having a terminal aliphatic carbon-carbon double bond, a is on average 2.5 to 8, b is on average a-2, c is on average 41 to 1000, d is on average 0 to 4, and e is on average 0 to 2, with the proviso that a-2 Mvi units are attached directly to T units, (B) organosilicon compounds having Si-bonded hydrogen atoms, and (C) catalysts which promote the addition of Si-bonded hydrogen to aliphatic double bonds, have exceptional utility as abhesive coatings.