Abstract:
There is disclosed a silicone pressure-sensitive adhesive composition based on a siloxane resin component, a polydiorganosiloxane polymer component having unsaturated groups in its molecule, a silicon hydride-functional crosslinking agent and a hydrosilation catalyst, wherein the crosslinking agent is a reaction product of a cyclic or linear organohydrogenpolysiloxane and an unsaturated organic compound selected from alpha-alkenes having 6 to 28 carbon atoms or aromatic compounds having the formula Ph-R.sup.4, wherein Ph represents a phenyl radical and R.sup.4 is a terminally unsaturated monovalent hydrocarbon group having 2 to 6 carbon atoms.
Abstract:
Adhesive compositions of this invention are characterized by the addition of certain silane compounds as adhesion promoters to addition curing type compositions which comprise a diorganopolysiloxane containing alkenyl groups bonded to silicon atoms and an organohydrogen polysiloxane containing hydrogen atoms bonded to silicon atoms, wherein the adhesion promoting silane compound, is of the formula: ##STR1## wherein R.sup.1 and R.sup.2 are either hydrogen atoms or lower alkyl groups, R.sup.3 and R.sup.4 are preferably lower alkyl groups and a and n are integers from 0 to 2.
Abstract:
An organopolysiloxane-based adhesive composition is proposed which exhibits very reliable adhesive bonding by being cured not only at an elevated temperature but also at room temperature. The adhesive composition comprises, in addition to an alkenyl group-containing diorganopolysiloxane, an organohydrogenpolysiloxane, which serves as a crosslinking agent of the alkenyl group-containing diorganopolysiloxane by the hydrosilation reaction, and a platinum compound to catalytically promote the reaction, a compound having an .alpha.-substituted or unsubstituted .beta.-aminopropionyl group and an alkoxysilyl-substituted alkyl group such as the compounds of the formulas(CH.sub.3 O).sub.3 Si--(CH.sub.2).sub.3 --NH--(CH.sub.2).sub.2 --CO--O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3 ;C.sub.6 H.sub.5 --CH.sub.2 --NH--(CH.sub.2).sub.2 --CO--O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3 ;CH.sub.2 .dbd.CH--CH.sub.2 --NH--(CH.sub.2).sub.2 --CO--O--(CH.sub.2).sub.3 --Si(OCH.sub.3).sub.3 ;and(CH.sub.3 O).sub.3 Si--(CH.sub.2).sub.3 --NH--(CH.sub.2).sub.2 --CO--O--CH.sub.2 --CH.dbd.CH.sub.2.
Abstract:
A linear or cyclic siloxane compound contains pendant carbon to carbon double bonds, Si—H bonds, and pendant oxetane functionality. These compounds have two curing temperatures, one associated with a hydrosilation reaction between the carbon to carbon double bond and the Si—H entity, and the other associated with the ring opening of the oxetane.
Abstract:
An adhesive composition comprising the following components: (A) a linear polyfluoro compound having at least two SiH bonds per molecule and a perfluoropolyether residue in a main chain of the linear polyfluoro compound (A); (B) an organohydrogensiloxane having a fluorinated group and at least two hydrogen atoms each bonded to a silicon atom per molecule; (C) a compound of a platinum group metal; (D) hydrophobic silica powder; (E) an alkoxysilane represented by the following formula (1) (RO)3—Si—T (1) wherein R is a monovalent hydrocarbon group, T is a group represented by the formula, —OR1 or —CHR2—COOR3, wherein R1 is a monovalent hydrocarbon group, which may be the same with or different from R, R2 is a hydrogen atom or a methyl group and R3 is a monovalent hydrocarbon group; and (F) an organosiloxane having at least one SiH bond and at least one group selected from the group consisting of an epoxy group and a trialkoxysilyl group. The composition has no quality variation from lot to lot and gives gives a cured product having good resistance to solvents and heat, and durability.
Abstract:
Silicone contact adhesives comprising a high viscosity substantially linear polyorganosiloxane, an MQ resin, a coupling agent and solvent, method of making and method of using are disclosed. This composition is neither hydrosilation nor peroxide cured.
Abstract:
Substantially branched alkenyl silicone polymer compositions having on average at least two branching points per molecule provide laminate release compositions that provide releasable laminates against methyl and phenyl silicone pressure sensitive adhesives.
Abstract:
A fast curing, addition-curable silicone composition curable to form an adhesive having good physical properties and improved lap shear adhesive properties, comprising (A) a vinyl-containing polydiorganosiloxane composition, (B) a hydrogen-terminated polysiloxane in an amount sufficient to provide an adhesion-promoting molar ratio of silicon-bonded hydrogen atoms in (B) to olefinically unsaturated radicals in (A); (C) a catalytic amount of a platinum-containing hydrosilation catalyst; (D) an effective amount of an adhesion promoter selected from the group consisting of (i) bis[3-(trimethoxysilyl)alkyl]fumarates; (ii) bis[3-(trimethoxysilyl)alkyl]maleates; (iii) allyl-[3-(trimethoxysilyl)alkyl]maleates; (iv) allyl-[3-(trimethoxysilyl)alkyl]fumarates; and (v) N-[3-(trimethoxysilyl)alkyl]maleimides, wherein R.sup.2, R.sup.3, and R.sup.4 are each alkyl radicals of 1 to about 8 carbon atoms; and (E) from about 0 to about 200 parts of an extending filler; and (F) from about 0 to about 50 parts of a reinforcing filler; providing that (F) must be present if (A)(ii) is absent.
Abstract:
The silicone rubber adhesive film of the present invention is characterized by simplicity of handling and an excellent workability and useablility, as well as by adhesiveness for various types of substrates and an excellent durability of adhesion. These characteristics are obtained because the silicone rubber adhesive film of the present invention comprises a silicone rubber composition which consists of components (A) through (G), particularly the specific wet-method hydrophobicized reinforcing silica comprising component (C) and the specific compounds of components (D) and (E) or components (D), (E), and (F), and because the tensile strength of said uncured silicone rubber composition falls within the range of 1.5 kg/cm.sup.2 to 5.0 kg/cm.sup.2 at 25 degrees Centigrade (JIS K 6301). Accordingly, when used on flat substrates such as textiles, glass, rubber sheet, etc., it can tightly bond the adhered partners into a single, integral body.
Abstract:
Organopolysiloxane compositions which can be cured to form elastomers and contain:(a) An organopolysiloxane containing Si-bonded vinyl groups;(b) an organopolysiloxane containing Si-bonded hydrogen;(c) a platinum catalyst which promotes the addition of Si-bonded hydrogen to vinyl groups;(d) an inhibitor which delays the addition reaction of Si-bonded hydrogen with vinyl groups at room temperature, with the proviso that inhibitors containing a hydroperoxy radical are excluded; and(e) an organic peroxide, with the proviso that acyl peroxides are excluded;are used as adhesives.These adhesives are used to bond similar or dissimilar organopolysiloxane elastomers to each other and to bond organopolysiloxane elastomers to optionally primed substrates.