Abstract:
A curable silicone rubber composition of the type referred to in industry as "self-adhesive" or as having "selective adhesion" (hereafter referred to as "curable self-adhesive silicone rubber compositions"). The curable self-adhesive silicone rubber compositions comprise: (A) one or more organopolysiloxanes containing at least 2 alkenyl groups and/or alkynyl groups per molecule and having a viscosity in a range of 1000mPa.s to 200,000mPa.s at 25°C; (B) an organopolysiloxane containing at least 2 or 3 silicon-bonded hydrogen atoms per molecule; (C) at least one hydrosilylation catalyst; (D) at least one reinforcing and optionally one or more non-reinforcing fillers; (E) an adhesion promoter; and (F) an oligomer which has been found to surprisingly provide heat-humidity stabilization.
Abstract:
To provide a room-temperature-curable silicone rubber which exhibits good adhesion to a substrate contacted during curing and can be efficiently peeled. The problem is solved by a room-temperature-curable silicone rubber composition comprising (A) an organopolysiloxane having in each molecule at least two specified alkoxysilyl-containing groups on silicon atoms in the molecular chain, (B) a diorganodialkoxysilane or partially hydrolyzed condensate thereof, and (C) a condensation-reaction catalyst.
Abstract:
A stable thermal radical curable silicone composition is provided that comprises (I) a clustered functional polyorganopolysiloxane having one or more radical curable groups selected from an acrylate group and a methacrylate group; (II) a reactive resin and polymer; (III) a radical initiator; (IV) a moisture cure initiator; and (V) a crosslinker. The reactive resin and polymer includes (a) an organopolysiloxane polymer and (b) an alkoxy-functional organopolysiloxane resin. The alkoxy-functional organopolysiloxane resin comprises the reaction product of a reaction of (i) an alkenyl-functional siloxane resin, (ii) an alkoxysilane- functional organosiloxane, and (iii) an endcapper in the presence of (iv) hydrosilylation catalyst. The stable thermal radical curable silicone composition can be utilized for electronics applications.
Abstract:
A polymer cures by both radiation and moisture curing mechanisms. The polymer is prepared by hydrosilylation. The polymer is useful in adhesive compositions. The polymer includes units of formulae (I), (R 2 2Si0 2/2 )b, (R 2 Si0 3/2 )c, (Si0 4/2 )d, (R 1 )f, and (R 2 3SiO 1/2 )g, where each R 1 is independently an oxygen atom or a divalent hydrocarbon group; each R 1 is independently divalent hydrocarbon group; each R 2 is independently a monovalent organic group that is free of terminal aliphatic unsaturation each X is independently a monovalent hydrolyzable group; each J is independently a monovalent epoxy functional organic group; subscript a has a value of 1 or more; subscript b has a value of 0 or more; subscript c has a value of 0 or more; subscript d has a value of 0 or more; subscript e has a value of 1 or more; subscript f has a value of 0 or more; subscript g has a value of 0 or more; subscript s is 1, 2, or 3; and subscript t is 1, 2, or 3.
Abstract:
A composition contains an organopolysiloxane having the following average chemical structure: X3SiO-SiR2-R'-(R2SiO)x-R2Si-[Rb-(R2SiO)y-R2Si-Rb'-(R2SiO)z-R2Si]m-R'-R2SiO-SiX3; where X is -OSiR2-R'-R2SiO-R2Si-R"-A; R is an alkyl group having from 2 to 6 carbons and aryl groups; R', R", Rb and Rb' are divalent hydrocarbon groups comprising a chain of 2 to 6 methylene units; A is acrylate, methacrylate or trialkoxysilyl; provided that, on average, 60 to 90 mole-percent of the A groups are acrylate and methacrylate; Subscript m has an average value in a range of zero to 10; Subscripts x, y and z each has an average value in a range of zero to 1200; and provided that the average values of m, x, y and z are such that the sum of the average values for x, y and z is in a range of 300-1200 and the molar ratio of methylene units to siloxane units is less than 0.15.
Abstract:
A composition contains a cluster organopolysiloxane having structure (I) where X = (aa) and R is independently in each occurrence selected from a group consisting of aryl groups and alkyl groups having from 2 to 6 carbons; R' and R" are independently in each occurrence selected from divalent hydrocarbon groups containing from 2 to 6 carbon atoms; n is a value in a range of 50 to less than 200; and A is independently in each occurrence selected from a group consisting of acrylate, methacrylate and trialkoxysilyl groups; provided that, on average, 50 to 95 mole-percent of the A groups are selected from acrylate and methacrylate groups and 5 to 50 mole-percent of the A groups are selected from trialkoxysilyl groups.
Abstract:
Hyperbranched polydiorganosiloxane polyoxamide polymers are formed from reaction mixtures containing AX g and BZ m compounds where either A or B is a siloxane-based group, and each X is either an oxalylamino-functional group or an amino-functional group, and each Z is either an amino-functional group or an oxylamino-functional group, such that upon reaction X and Z form an oxamide bond.
Abstract:
One-component UV and thermal curable temporary adhesives for use in high temperature applications are provided. Said adhesives comprise (i) the partial hydrosilylation reaction product of the reaction between the vinyl groups on l,3,5,7-tetravinyl-l,3,5,7- tetramethylcyclotetrasiloxane and the terminal Si-H hydrogens on a silane or siloxane having terminal Si-H hydrogens, and (ii) a photo and/or thermal radical cure initiator. Also assemblies including such an adhesive and methods of using said adhesive are encompassed.
Abstract:
Provided in various embodiments are silicone-based storage stable temporary bonding adhesive compositions. The storage stable TBA compositions are formed by combining (e.g., mixing or blending) an alkenyl functional siloxane polymer, an alkenyl functional filler with a particle size below one micrometer, an SiH-containing crosslinker, a hydrosilylation catalyst, and a cure inhibitor where the molar ratio of the cure inhibitor and the hydrosilylation catalyst is greater than 40/1 and less than 500/1. The resulting TBA compositions may be one-part compositions. The TBA compositions can be used in varied applications including 3D chip integration, packaging applications, semiconductor devices, radio-frequency identification tags, chip cards, high-density memory devices, and microelectronic devices.
Abstract:
A polymer cures by either radiation or moisture curing mechanisms, or both. The polymer is prepared by hydrosilylation. The polymer includes units of formula: (R 2 2 Si0 2/2 ) b, (R 2 Si0 3/2 ) c , (SiO 4/2 ) d, (R 1 ') f, and (R 2 3 Si0 1/2 ) g, where each R 1 is independently an oxygen atom or a divalent hydrocarbon group; each R 1' is independently divalent hydrocarbon group; each R 2 is independently a monovalent organic group that is free of terminal aliphatic unsaturation each X is independently a monovalent hydrolyzable group; each J is independently a monovalent epoxy functional organic group; subscript a has a value of 1 or more; subscript b has a value of 0 or more; subscript c has a value of 0 or more; subscript d has a value of 0 or more; subscript e has a value of 1 or more; subscript f has a value of 0 or more; subscript g has a value of 0 or more; subscript s is 1, 2, or 3; and subscript t is 1, 2, or 3.