Organosilicon compounds having Si-bonded hydrogen atoms in crosslinkable compositions
First Claim
1. A addition-crosslinkable composition comprising(A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds,(B) an organosilicon compound having Si-bonded hydrogen atoms, comprising(a) on average per molecule, at least four structural units of the formula
whereR is an identical or different monovalent, optionally halogenated, hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical,Z is a divalent aliphatic hydrocarbon radical having from 2 to 12 carbon atoms per radical,a is 1, 2 or 3 andx is 0 or 1,(C) a hydrosilylation catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bonds and, optionally,(D) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bonds at room temperature.
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Abstract
A novel crosslinkable composition comprising
(A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds,
(B) an organosilicon compound having Si-bonded hydrogen atoms,
(C) a catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bonds and, optionally,
(D) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bonds at room temperature,
wherein the organosilicon compounds having Si-bonded hydrogen atoms (B) used are ones comprising
(a) on average per molecule, at least one structural unit of the formula
--Z--SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x (I),
where
R is an identical or different monovalent, optionally halogenated hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical,
Z is a divalent aliphatic hydrocarbon radical having from 2 to 12 carbon atoms per radical,
a is 1, 2 or 3, and
x is 0 or 1.
34 Citations
8 Claims
- 1. A addition-crosslinkable composition comprising
(A) an organosilicon compound having radicals containing aliphatic carbon-carbon multiple bonds, (B) an organosilicon compound having Si-bonded hydrogen atoms, comprising (a) on average per molecule, at least four structural units of the formula - space="preserve" listing-type="equation">--Z--SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x (I),
where R is an identical or different monovalent, optionally halogenated, hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical, Z is a divalent aliphatic hydrocarbon radical having from 2 to 12 carbon atoms per radical, a is 1, 2 or 3 and x is 0 or 1, (C) a hydrosilylation catalyst which promotes the addition of Si-bonded hydrogen onto aliphatic multiple bonds and, optionally, (D) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bonds at room temperature. - View Dependent Claims (3, 8)
- 2. A crosslinkable composition comprising
(A) organosilicon compounds having radicals containing aliphatic carbon-carbon multiple bonds, (B) organosilicon compounds having Si-bonded hydrogen atoms, (C) catalysts which promote the addition of Si-bonded hydrogen onto aliphatic multiple bonds and, optionally, (D) agents which retard the addition of Si-bonded hydrogen onto aliphatic multiple bonds at room temperature, wherein the organosilicon compounds having Si-bonded hydrogen atoms (B) used are ones which can be prepared by reacting siloxanes (1) of the general formula - space="preserve" listing-type="equation">R.sup.1 SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x
where R is an identical or different monovalent, optionally halogenated hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical, R1 is a monovalent aliphatic hydrocarbon radical having a terminal aliphatic double bond and from 2 to 12 carbon atoms per radical, a is 1, 2 or 3 and x is 0 or 1, with organosilicon compounds (2) containing, on average per molecule, at least one Si-bonded hydrogen atom and which are free of aliphatic multiple bonds, in the presence of catalysts (3) which promote the addition of Si-bonded hydrogen onto aliphatic multiple bonds, where the ratio of Si-bonded hydrogen in organosilicon compound (2) to aliphatic double bonds in siloxane (1) is from 1;
0.1 to 1;
20.
- 4. An organosilicon compound having Si-bonded hydrogen atoms (B) comprising
(a) on average per molecule, at least one structural unit of the formula - space="preserve" listing-type="equation">--Z--SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x (I),
where R is an identical or different monovalent, optionally halogenated hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical, Z is a divalent aliphatic hydrocarbon radical having from 2 to 12 carbon atoms per radical, a is 1, 2 or 3 and x is 1. - View Dependent Claims (5, 6, 7)
- 6. The process as claimed in claim 5, wherein the siloxane (1) used is vinyltris(dimethylsiloxy)silane.
- 7. The process as claimed in claim 5, wherein the siloxanes (1) of the formula
- space="preserve" listing-type="equation">R.sup.1 SiR.sub.x (OSiR.sub.3-a H.sub.a).sub.3-x
where R is an identical or different monovaent, optionally halogenated hydrocarbon radical which is free of aliphatic multiple bonds and has from 1 to 8 carbon atoms per radical, R1 is a monovalent aliphatic hydrocarbon radical having a terminal aliphatic double bond and from 2 to 12 carbon atoms per radical, a is 1, 2 or 3 and x is 0 or 1, and are prepared by reacting silanes (4) of the formula
space="preserve" listing-type="equation">R.sup.1 R.sub.x SiY.sub.3-xwith disiloxanes (5) of the formula
space="preserve" listing-type="equation">(H.sub.a R.sub.3-a Si).sub.2 Owhere Y can be identical or different and are each a halogen atom or a radical of the formula --OR2, where R2 is an alkyl radical which has from 1 to 8 carbon atoms per radical and may be substituted by an ether oxygen atom, and R, R1, a and x are as defined above, and water in the presence of hydrolysis-promoting catalysts (6), where the ratio of Si atoms in disiloxane (5) to hydrolyzable groups Y in silane (4) is from 0.8 to 5.0.
Specification
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- Resources
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Current AssigneeWacker-Chemie GmbH (Dr. Alexander Wacker Familiengesellschaft Mit Beschrã¤Nkter Haftung)
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Original AssigneeWacker-Chemie GmbH (Dr. Alexander Wacker Familiengesellschaft Mit Beschrã¤Nkter Haftung)
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InventorsRieger, Elfriede, Herzig, Christian
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Primary Examiner(s)Marquis, Melvyn I.
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Application NumberUS08/881,410Time in Patent Office875 DaysField of Search528/31, 528/15, 428/447US Class Current428/447CPC Class CodesC08G 77/12 containing silicon bound to...C08G 77/20 containing silicon bound to...C08G 77/50 by carbon linkages C08G77/4...C08L 83/00 Compositions of macromolecu...C08L 83/04 PolysiloxanesC09D 183/04 PolysiloxanesY10T 428/31663 As siloxane, silicone or si...
