EP0449181A2
Expired / Lapsed
EP
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One-part curable organosiloxane composition
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1991-03-25
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Granted: —
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Expires: 2011-03-25
Abstract
Abstract The adhesion of cured elastomers and resins prepared using organosiloxane compositions that cure by a platinum-catalyzed hydrosilylation reaction is substantially increased without the necessity of adding adhesion promoters as taught in the prior art when the organohydrogenpolysiloxanes contains at least one silicon-bonded alkoxysilylalkyl group per molecule.
Inventors
- 👤 Atsushi Togashi
- 👤 Akira Kasuya
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 18:23
CPC Classifications
C; C08; C08K; C08K9/00; C08K9/10; C08L; C08L83/00; C08L83/04; C08G; C08G77/00; C08G77/04; C08G77/12; C08G77/20; C08G77/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
175 words
In a one-part curable organosiloxane curable by a platinum-catalyzed hydrosilylation reaction, said composition comprising (A) an organopolysiloxane containing at least two silicon-bonded alkenyl radicals in each molecule and represented by the average formula R a SiO (4 - a)/2 wherein R is a substituted or unsubstituted monovalent hydrocarbon group the value of a is from 1.0 to 2.3, inclusive. (B) as the curing agent for said composition, an organohydrogenpolysiloxane containing at least 2 silicon-bonded hydrogen atoms per molecule, and (C) a hydrosilylation-reaction catalyst which is microencapsulated within a layer of a thermoplastic resin exhibiting a softening point of 50 to 200°C., where said catalyst is selected from the group consisting of metals from the platinum group of the periodic table of the elements and compounds of said metals, the improvement comprising the presence in said organohydrogenpolysiloxane of at least one unit represented by the formula where R² is selected from the same group of hydrocarbon radicals as R¹, R³ represents an alkyl radical, and R⁴ represents an alkenyl radical containing at least two carbon atoms.
Claim 2
Dependent Claim
86 words
A curable composition according to claim 1 where R¹ and R² are individually selected from the group consisting of alkyl, alkenyl, aryl and halogenated alkyl radical, the viscosity of said organopolysiloxane is from 10 to 1,000,000 centipoise at 25°C., R³ is methyl, ethyl, isopropyl or butyl, and R⁴ is ethylene , R⁴ represents an ethylene radical and the concentration of said organohydrogenpolysiloxane is equivalent to a molar ratio of silicon-bonded hydrogen atoms in said organohydrogenpolysiloxane to alkenyl radicals in said organopolysiloxane of from 0.5:1 to 10:1.
Claim 3
Dependent Claim
51 words
A curable composition according to claim 2 where at least a portion of the radicals represented by R¹ and R² are methyl, said catalyst is platinum metal or a platinum compound and said thermoplastic resin is selected from the group consisting of silicone resins, polysilane resins, acrylic resins and polystyrene resins.
Claim 4
Dependent Claim
20 words
A curable composition according to claim 3 where the platinum compound is present as a complex with an alkenyl-substituted siloxane.
References Cited (Backward Citations)
No citation records indexed.
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