Abstract:
Release modifier composition useful in release coating compositions comprising a fluorosilicone compound having perfluoroalkyl groups and at least three silicon-bonded hydrogen atoms and a MQ resin having at least one alkenyl group. Release coating compositions comprising the release modifier compositions and a method for modifying the release force of release coating compositions is also claimed.
Abstract:
A release modifier which comprises (i) a MQ resin consisting essentially of units of the formulae SiO.sub.2 and R.sub.3 SiO.sub.1/2 wherein R denotes a monovalent hydrocarbon group having up to 3 carbon atoms, a hydrogen atom, a c.sub.2-5 alkenyl group of the formula --R'CH.dbd.CH.sub.2, provided there is at least one group --R'CH.dbd.CH.sub.2 present per MQ molecule and (ii) a .alpha.,.omega.-diolefin having the general formula CH.sub.2 .dbd.CH--(CH.sub.2).sub.n --CH.dbd.CH.sub.2, wherein n denotes an integer with a value of from 4 to 18 gives improved release force over prior art controlled release additives. Also claimed is a solventless release composition based on siloxanes having SiH groups and a catalyst in addition to the release modifier.
Abstract:
A method of making silethynyl polymers having units of the general formula --(R.sub.2 SiC.tbd.C)-- wherein each R independently denotes a hydrogen atom, an alkyl, aryl or alkenyl group or a substituted alkyl, aryl or alkenyl group having up to 18 carbon atoms comprises adding a lithium salt of one or more diethynylsilanes of the general formula R.sub.2 Si(C.tbd.CH).sub.2 to one or more dihalosilanes of the general formula R.sub.2 SiX.sub.2 where X is a halogen atom and allowing the components to react. Copolymers with alternating units can be made. Linear polymers are made preferentially. Limiting the use of solvent increases the percentage of linear polymers produced.
Abstract:
A method for creating adhesion includes plasma treating two substrates and thereafter contacting the substrates. The method can be used on a variety of dry surfaces. The method is used to adhere nonadhesive surfaces such as a cured silicone with a ceramic or semiconductor.
Abstract:
A method of making silethynyl-siloxane copolymers having R.sub.2 SiC.tbd.C units and R.sub.2 SiO units wherein each R denotes H or a C.sub.1-16 hydrocarbon or substituted hydrocarbon group, comprises ring-opening copolymerization in the presence of a catalytic amount of a lithium compound, of cyclic siloxanes and cyclic silethynyl polymers. Novel silethynyl-siloxane copolymers of the formula ##STR1## are also disclosed wherein R' denotes --C.tbd.CH or R and a and b are at least 1.
Abstract translation:制备具有R 2 SiC 3 C C单元和R 2 SiO单元的硫代乙炔基 - 硅氧烷共聚物的方法,其中每个R表示H或C 1-6烃或取代的烃基,包括在催化量的锂化合物存在下开环共聚, 环状硅氧烷和环状硫代乙炔基聚合物。 还公开了具有式“IMAGE”的新型硫代乙炔基 - 硅氧烷共聚物,其中R'表示-C3BCH或R,a和b至少为1。
Abstract:
Organosilbutadiyne polymers having the general formula R'-[(R).sub.2 Si--C.tbd.C--C.tbd.C].sub.n -(R).sub.2 SiR' wherein R is a hydrogen atom, a hydrocarbon group or a substituted hydrocarbon group, R' is hydroxyl, halogen or R and n is an integer, are made by (A) reacting HC.tbd.C--C.dbd.CH--OZ with alkyllithium in a molar ratio of 1:3 wherein Z denotes an alkyl group having up to 6 carbon atoms followed by (B), further reacting the product of (A) with one or more dihalosilanes.
Abstract translation:具有通式R' - [(R)2Si-C 3BOND CC 3BOND C] n - (R)2 SiR'的有机二亚乙基聚合物,其中R是氢原子,烃基或取代烃基,R'是羟基,卤素 或者R和n是整数,由(A)使HC 3BOND CC = CH-OZ与摩尔比为1:3的烷基锂反应,其中Z表示具有至多6个碳原子的烷基,接着是(B), 进一步使(A)的产物与一种或多种二卤代硅烷反应。