Curable organopolysiloxane compositions
First Claim
1. A curable organopolysiloxane composition consisting essentially of(a) 100 parts by weight of a diorganopolysiloxane having at least two vinyl groups in the molecule, the organic groups other than the vinyl groups being substituted or unsubstituted monovalent hydrocarbon groups free of aliphatic unsaturation,(b) from 0 to 100 parts by weight of an organopolysiloxane expressed by the average unit formula
where the symbol R is a substituted or unsubstituted monovalent hydrocarbon groups free of aliphatic unsaturation and u, v and w are the mole fractions of the respective siloxane units with the proviso that (u+v)/w is in the range from 0.5 to 2.0 and u+v+w=1, the content of the vinyl groups being in the range from 0.5 to 3% by weight,(c) an organohydrogenpolysiloxane having at least three hydrogen atoms directly bonded to the silicon atoms in the molecule in an amount such that from 0.7 to 5 moles of the hydrogen atoms directly bonded to the silicon atoms are provided per mole of the vinyl groups in the components (a) and (b),(d) from 0.1 to 5 parts by weight of an alkoxy silane having an aliphatically unsaturated group,(e) from 0 to 500 parts by weight of a filler, and(f) a catalytic amount of platinum or a platinum compound.
CH)(R).sub.2 SiO.sub.0.5 ].sub.u [(R).sub.3 SiO.sub.0.5 ].sub.v [SiO.sub.2 ].sub.w
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Abstract
The present invention presents a novel curable organopolysiloxane composition capable of being adhesively bonded firmly to the surface of various substrates with which it has been in contact during its curing by heating without the primer treatment of the surface. The composition is essentially composed of a diorganopolysiloxane terminated at both chain ends with vinyl groups as the base component, optionally, in combination of a copolymeric organopolysiloxane composed of vinyl-containing monofunctional siloxane units and tetrafunctional siloxane units SiO2, an organohydrogen-polysiloxane having at least three silicon-bonded hydrogen atoms per molecule as a crosslinking agent by the addition reaction with the vinyl groups in the base component, a platinum catalyst to accelerate the above addition reaction and an alkoxy silane having an aliphatically unsaturated group which serves as a "self-bonding" improver in the composition with or without the addition of a filler.
44 Citations
7 Claims
- 1. A curable organopolysiloxane composition consisting essentially of
(a) 100 parts by weight of a diorganopolysiloxane having at least two vinyl groups in the molecule, the organic groups other than the vinyl groups being substituted or unsubstituted monovalent hydrocarbon groups free of aliphatic unsaturation, (b) from 0 to 100 parts by weight of an organopolysiloxane expressed by the average unit formula - space="preserve" listing-type="equation">[(CH.sub.2 ═
CH)(R).sub.2 SiO.sub.0.5 ].sub.u [(R).sub.3 SiO.sub.0.5 ].sub.v [SiO.sub.2 ].sub.w
where the symbol R is a substituted or unsubstituted monovalent hydrocarbon groups free of aliphatic unsaturation and u, v and w are the mole fractions of the respective siloxane units with the proviso that (u+v)/w is in the range from 0.5 to 2.0 and u+v+w=1, the content of the vinyl groups being in the range from 0.5 to 3% by weight, (c) an organohydrogenpolysiloxane having at least three hydrogen atoms directly bonded to the silicon atoms in the molecule in an amount such that from 0.7 to 5 moles of the hydrogen atoms directly bonded to the silicon atoms are provided per mole of the vinyl groups in the components (a) and (b), (d) from 0.1 to 5 parts by weight of an alkoxy silane having an aliphatically unsaturated group, (e) from 0 to 500 parts by weight of a filler, and (f) a catalytic amount of platinum or a platinum compound. - View Dependent Claims (2, 3, 4, 5, 6, 7)
- 4. The curable organopolysiloxane composition as claimed in claim 1 wherein at least 70 mole % of the organic groups other than the vinyl groups in the component (a) consists of methyl groups, the remaining consisting of phenyl groups.
- 5. The curable organopolysiloxane composition as claimed in claim 1 wherein the component (a) has a viscosity in the range from 50 to 1,000,000 centistockes at 25°
- C.
- 6. The curable organopolysiloxane composition as claimed in claim 1 wherein the amount of the component (b) is in the range from 10 to 50 parts by weight per 100 parts by weight of the component (a).
- 7. The curable organopolysiloxane composition as claimed in claim 1 wherein the aliphatically unsaturated group in the component (d) is selected from the class consisting of vinyl, allyl and 3-methacryloxypropyl groups.
- space="preserve" listing-type="equation">[(CH.sub.2 ═
Specification
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- Resources
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Current AssigneeShin-Etsu Chemical Company Limited
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Original AssigneeShin-Etsu Chemical Company Limited
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InventorsTanaka, Masaki, Imai, Kiyoshi
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Primary Examiner(s)Marquis, Melvyn I.
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Application NumberUS05/934,197Time in Patent Office594 DaysField of Search528/15, 528/31, 528/32, 528/33, 528/34, 528/43, 260/37 SBUS Class Current528/15CPC Class CodesC08G 77/12 containing silicon bound to...C08G 77/20 containing silicon bound to...C08G 77/70 Siloxanes defined by use of...C08K 5/54 Silicon-containing compound...C08L 2666/28 Non-macromolecular organic ...C08L 83/00 Compositions of macromolecu...C08L 83/04 PolysiloxanesY10T 428/31612 As silicone, silane or silo...Y10T 428/31663 As siloxane, silicone or si...
