Storage-stable polysiloxane composition which gives permanently water-wettable vulcanizates
First Claim
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1. A storage-stable polysiloxane composition which gives permanently water-wettable elastomeric vulcanizates, consisting essentially of separately stored components;
- (A) a polysiloxane having SiC-bonded C1 -C6 -alkyl radicals and/or phenyl radicals wherein the polysiloxane has at least two C1 -C6 -alkenyl radicals per molecule and is essentially free of Si--H groups, and a noble metal catalyst,(B) a composition which is free of noble metal catalysts and contains polysiloxanes having Si-C bonded C1 -C6 -alkyl radicals and/or phenyl radicals, wherein the polysiloxane has at least three Si--H groups per molecule and optionally a polysiloxane composition having Si-C bonded C1 -C6 -alkyl radicals and/or phenyl radicals, wherein the optional polysiloxane has at least two C1 -C6 -alkenyl radicals per molecule, and a hydrophilic modifier of the general formula
space="preserve" listing-type="equation">[R.sub.3 SiO.sub. 1/2 ].sub.a [R.sup.1 R.sub.2 SiO.sub. 1/2 ].sub.b [ZR.sub.2 SiO.sub. 1/2 ].sub.c [ZRR.sup.1 SiO.sub. 1/2 ].sub.d [RR.sup.1 SiO.sub. 2/2 ].sub.e [R.sub.2 SiO.sub. 2/2 ].sub.f [SiO.sub. 4/2 ].sub.g [RSiO.sub. 3/2 ].sub.h [R.sup.1 SiO.sub. 3/2 ].sub.i (I)in which the radicalsR denote hydrogen atoms or identical or different monovalent, optionally halogen-substituted C1 -C12 -hydrocarbon radicals bonded via SiC, in which at least one of the radicals R contains an aliphatic double bond or denotes a hydrogen atom;
R1 denotes the general formula II
space="preserve" listing-type="equation">E[OY].sub.x R.sup.2 (II)in which E denotes a single bond or a C1 -C6 -alkylene radical, Y denotes identical or different C1 -C4 -alkylene radicals, R2 denotes a hydroxyl group or a C1 -C6 -alkoxy or C1 -C6 -oxycarbonylalkyl radical and x has values from 1 to 20; and
Z has the meanings of R2 or denotes a halogen atom;
with the proviso that a, b, c and d in each case independently of one another have values from 0 to 8, the sum of a+b+c+d is 2 to 8, the sum of a+b+c+d+e+f+g+h+i is 10 to 400 and the ratio of the sums of a+b+f+g+h;
b+d+e+i is 100;
1 to 1;
1,wherein the hydrophilic modifier is present in component (A) or (B) or both (A) and (B) with the proviso that a hydrophilic modifier having SiH- groups can only be present in component (B).
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Abstract
The present invention relates to storage-stable polysiloxane compositions which give permanently water-wettable elastomers. The polysiloxane compositions of the present invention which vulcanize to yield elastomers are useful as dental impression compositions.
40 Citations
8 Claims
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1. A storage-stable polysiloxane composition which gives permanently water-wettable elastomeric vulcanizates, consisting essentially of separately stored components;
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(A) a polysiloxane having SiC-bonded C1 -C6 -alkyl radicals and/or phenyl radicals wherein the polysiloxane has at least two C1 -C6 -alkenyl radicals per molecule and is essentially free of Si--H groups, and a noble metal catalyst, (B) a composition which is free of noble metal catalysts and contains polysiloxanes having Si-C bonded C1 -C6 -alkyl radicals and/or phenyl radicals, wherein the polysiloxane has at least three Si--H groups per molecule and optionally a polysiloxane composition having Si-C bonded C1 -C6 -alkyl radicals and/or phenyl radicals, wherein the optional polysiloxane has at least two C1 -C6 -alkenyl radicals per molecule, and a hydrophilic modifier of the general formula
space="preserve" listing-type="equation">[R.sub.3 SiO.sub. 1/2 ].sub.a [R.sup.1 R.sub.2 SiO.sub. 1/2 ].sub.b [ZR.sub.2 SiO.sub. 1/2 ].sub.c [ZRR.sup.1 SiO.sub. 1/2 ].sub.d [RR.sup.1 SiO.sub. 2/2 ].sub.e [R.sub.2 SiO.sub. 2/2 ].sub.f [SiO.sub. 4/2 ].sub.g [RSiO.sub. 3/2 ].sub.h [R.sup.1 SiO.sub. 3/2 ].sub.i (I)in which the radicals R denote hydrogen atoms or identical or different monovalent, optionally halogen-substituted C1 -C12 -hydrocarbon radicals bonded via SiC, in which at least one of the radicals R contains an aliphatic double bond or denotes a hydrogen atom; R1 denotes the general formula II
space="preserve" listing-type="equation">E[OY].sub.x R.sup.2 (II)in which E denotes a single bond or a C1 -C6 -alkylene radical, Y denotes identical or different C1 -C4 -alkylene radicals, R2 denotes a hydroxyl group or a C1 -C6 -alkoxy or C1 -C6 -oxycarbonylalkyl radical and x has values from 1 to 20; and
Z has the meanings of R2 or denotes a halogen atom;
with the proviso that a, b, c and d in each case independently of one another have values from 0 to 8, the sum of a+b+c+d is 2 to 8, the sum of a+b+c+d+e+f+g+h+i is 10 to 400 and the ratio of the sums of a+b+f+g+h;
b+d+e+i is 100;
1 to 1;
1,wherein the hydrophilic modifier is present in component (A) or (B) or both (A) and (B) with the proviso that a hydrophilic modifier having SiH- groups can only be present in component (B). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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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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InventorsGarhammer, Arnold, Hefner, deceased, Heinz, Schmidlkofer, Richard, Huber, Peter, Stepp, Michael, Mueller, Johann
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Primary Examiner(s)Marquis, Melvyn I.
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Application NumberUS08/196,106Time in Patent Office1,027 DaysField of Search524/731, 524/267, 524/264, 524/263, 525/478, 528/15US Class Current524/731CPC Class CodesA61K 6/90 Compositions for taking den...C08G 77/12 containing silicon bound to...C08G 77/16 to hydroxyl groupsC08G 77/18 to alkoxy or aryloxy groupsC08G 77/20 containing silicon bound to...C08G 77/24 halogen-containing groupsC08L 83/00 Compositions of macromolecu...C08L 83/04 Polysiloxanes
