Process for producing polysiloxanes and use of the same
A process for the preparation of an organosilicon condensate which comprises reacting together a silicon containing compound having at least one silanol group and a silicon containing compound having at least one —OR group or at least one silanol group (or a compound having both groups) in the presence of strontium oxide, barium oxide, strontium hydroxide or barium hydroxide and optionally a solvent such as water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol, acetone or toluene.
1 . A process for the preparation of an organosilicon condensate that comprises reacting together:
at least one silicon containing compound (A) having at least one silanol group; and
at least one silicon containing compound (B) having at least one silicon bonded —OX group wherein X represents at least one chosen from a group comprising hydrogen, an alkyl group having from 1 to 8 carbon atoms, an alkoxyalkyl group having from 2 to 8 carbon atoms, wherein the reaction is in the presence of a catalyst (C) selected from a group comprising strontium oxide, barium oxide, strontium hydroxide, barium hydroxide and mixtures thereof, and at least one solvent (D) selected to allow the reaction to proceed.
2 . A process according to claim 1 wherein the organosilicon condensate is a siloxane or polysiloxane.
3 . A process according to claim 1 wherein (A) and (B) are independently monomeric, dimeric, oligomeric or polymeric compounds.
4 . A process according to claim 1 wherein (A) is a silanol having between one and three unsubstituted or substituted hydrocarbon groups having from 1 to 18 carbon atoms.
5 . A process according to claim 4 wherein the silanol is selected from a group comprising diphenyl silanediol, 4-vinyl-diphenyl silanediol and dipentafluorophenyl silanediol.
6 . A process according to claim 1 wherein (A) comprises a crosslinkable group.
7 . A process according to claim 6 wherein the crosslinkable group is selected from a group comprising an epoxide group, a double bond of the acrylate type, a double bond of the methacrylate type and a double bond of the styrene type.
8 . A process according to claim 1 wherein (B) is a monomeric compound with the general formula
G y Si(OR) 4-y
wherein y has a value of 0, 1, 2 or 3,
G represents an unsubstituted or substituted hydrocarbon group having from 1 to 18 carbon atoms; and
R represents an alkyl group having from 1 to 8 carbon atoms or an alkoxyalkyl group having from 2 to 8 carbon atoms.
9 . A process according to claim 8 wherein (B) is an alkoxysilane, which has from one to four alkoxy groups inclusive.
10 . A process according to claim 8 wherein OR is selected from a group comprising methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy and t-butoxy.
11 . A process according to claim 8 wherein R and G independently comprise a crosslinkable group.
12 . A process according to claim 11 wherein the crosslinkable group is selected from a group comprising an epoxide group, a double bond of the acrylate type, a double bond of the methacrylate type and a double bond of the styrene type.
13 . A process according to claim 8 wherein (B) is selected from a group comprising an propyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, phenylethyltrimethoxysilane, phenylpropyltrimethoxysilane, 3,3,3-trifluoro-propyltrimethoxysilane, nonafluoro-1,1,2,2-tetrahydrohexyl-trimethoxysilane, tridecafluoro-1,1,2,2-tetrahydrooctyl-trimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-styrylpropyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane.
14 . A process according to claim 1 wherein (B) is an oligomeric or polymeric compound of general formula
R 1 3 SiO(SiR 1 2 O) n SiR 1 2 OR
wherein R is chosen from a group comprising an alkyl group having from 1 to 8 carbon atoms and an alkoxyalkyl group having from 2 to 8 carbon atoms, n is an integer ≧0, and each R 1 is chosen from a group comprising an unsubstituted or substituted hydrocarbon group having from 1 to 18 carbon atoms, an alkoxy group having from 1 to 8 carbon atoms, and an alkoxyalkyl group having from 2 to 8 carbon atoms.
15 . A process according to claim 1 wherein (A) and (B) are each hydroxy-terminated siloxanes of general formula HO—(SiR 1 R 2 O) n —H
wherein R 1 and R 2 are chosen from a group comprising unsubstituted or substituted hydrocarbon groups having from 1 to 18 carbon atoms and n is an integer >0.
16 . A process according to claim 1 wherein the at least one solvent is present in an amount of from 0.02% to 200% by mole ratio based on the total silicon containing compounds.
17 . A process according to claim 1 wherein the at least one solvent comprises a protic solvent.
18 . A process according to claim 17 wherein the protic solvent is selected from a group comprising water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol.
19 . A process according to claim 18 wherein the protic solvent is water, employed in an amount less than 8% by mole ratio based on the total silicon containing compounds.
20 . A process according to claim 1 wherein the at least one solvent comprises a non-protic solvent.
21 . A process according to claim 1 wherein the catalyst is employed in an amount of from 0.0005 to 5% by mole ratio based on the total silicon containing compounds.
22 . A process according to claim 1 further comprising separation of the catalyst from the organosilicon condensate.
23 . A process according to claim 1 wherein the organosilicon condensate has a viscosity in the range from 1,000 to 4,000 cP.
24 . A process for the preparation of an organosilicon condensate comprising condensing at least one silicon containing compound having:
at least one silanol group (a);
and
at least one —OX group (b),
wherein X is chosen from a group comprising hydrogen, an alkyl group having from 1 to 8 carbon atoms, and an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of a catalyst (c) selected from a group comprising strontium oxide, barium oxide, strontium hydroxide, barium hydroxide and mixtures thereof, and
at least one solvent (d) selected to allow the reaction to proceed.
25 . A process according to claim 24 wherein the at least one solvent is present in an amount of from 0.02% to 200% by mole ratio based on the total silicon containing compounds.
26 . A process according to claim 24 wherein the at least one solvent comprises a protic solvent.
27 . A process according to claim 26 wherein the protic solvent is selected from a group comprising water, methanol, ethanol, 1-propanol, 2-propanol, 1-butanol and 2-butanol.
28 . A process according to claim 27 wherein the protic solvent is water, employed in an amount less than 8% by mole ratio based on the total silicon containing compounds.
29 . A process according to claim 24 wherein the at least one solvent comprises a non-protic solvent.
30 . A process according to claim 24 wherein the catalyst is employed in an amount of from 0.0005 to 5% by mole ratio based on the total silicon containing compounds.
31 . A process according to claim 24 further comprising separation of the catalyst from the organosilicon condensate.
32 . A process according to claim 24 wherein the organosilicon condensate has a viscosity in the range from 1,000 to 4,000 cP.
33 . A process for the preparation of an organosilicon condensate comprising reacting together:
at least one silicon containing compound (A) having at least one silanol group;
and
at least one silicon containing compound (B) having at least one silicon bonded —OX group wherein X is chosen from a group comprising hydrogen, an alkyl group having from 1 to 8 carbon atoms, or an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of a catalyst (C) selected from a group comprising strontium oxide, barium oxide, strontium hydroxide, barium hydroxide and mixtures thereof.
34 . A process according to claim 33 wherein the catalyst is selected from a group comprising strontium oxide and barium oxide.
35 . A process according to claim 33 wherein the organosilicon condensate is chosen from a group comprising siloxane and polysiloxane.
36 . A process according to claim 33 wherein (A) and (B) are chosen from a group comprising monomeric, dimeric, oligomeric and polymeric compounds.
37 . A process according to claim 33 wherein (A) is a silanol is chosen from a group comprising compounds with from one to three unsubstituted or substituted hydrocarbon groups having from 1 to 18 carbon atoms.
38 . A process according to claim 37 wherein the silanol is selected from is chosen from a group comprising diphenyl silanediol, vinyl-diphenyl silanediol and dipentafluorophenyl silanediol.
39 . A process according to claim 33 wherein (A) comprises a crosslinkable group.
40 . A process according to claim 39 wherein the crosslinkable group is chosen from a group comprising an epoxide group, a double bond of the acrylate type, a double bond of the methacrylate type and a double bond of the styrene type.
41 . A process according to claim 33 wherein (B) is a monomeric compound with the general formula
G y Si(OR) 4-y
wherein y has a value of 0, 1, 2 or 3,
G is chosen from a group comprising a unsubstituted and a substituted hydrocarbon group having from 1 to 18 carbon atoms; and
R is chosen from a group comprising alkyl groups having from 1 to 8 carbon atoms and alkoxyalkyl groups having from 2 to 8 carbon atoms.
42 . A process according to claim 41 wherein (B) is an alkoxysilane, which has from one to four alkoxy groups inclusive.
43 . A process according to claim 41 wherein OR is chosen from a group comprising methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, s-butoxy and t-butoxy.
44 . A process according to claim 41 wherein R or G are chosen from a group comprising crosslinkable groups.
45 . A process according to claim 44 wherein the crosslinkable group is chosen from a group comprising an epoxide group, a double bond of the acrylate type, a double bond of the methacrylate type and a double bond of the styrene type.
46 . A process according to claim 41 wherein (B) is chosen from a group comprising propyltrimethoxysilane, hexyltrimethoxysilane, octyltrimethoxysilane, decyltrimethoxysilane, dodecyltrimethoxysilane, hexadecyltrimethoxysilane, vinyltrimethoxysilane, phenyltrimethoxysilane, phenylethyltrimethoxysilane, phenylpropyltrimethoxysilane, 3,3,3-trifluoro-propyltrimethoxysilane, nonafluoro-1,1,2,2-tetrahydrohexyl-trimethoxysilane, tridecafluoro-1,1,2,2-tetrahydrooctyl-trimethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-acryloxypropyltrimethoxysilane, 3-styrylpropyltrimethoxysilane and 3-glycidoxypropyltrimethoxysilane.
47 . A process according to claim 33 wherein (B) is an oligomeric or polymeric compound of general formula
R 1 3 SiO(SiR 1 2 O) n SiR 1 2 OR
wherein R is chosen from a group comprising an alkyl group having from 1 to 8 carbon atoms and an alkoxyalkyl group having from 2 to 8 carbon atoms, n is an integer ≧0, and each R 1 is chosen optionally from a group comprising an unsubstituted or substituted hydrocarbon group having from 1 to 18 carbon atoms, an alkoxy group having from 1 to 8 carbon atoms, and an alkoxyalkyl group having from 2 to 8 carbon atoms.
48 . A process according to claim 33 wherein (A) and (B) are each hydroxy-terminated siloxanes of general formula HO—(SiR 1 R 2 O) n —H
wherein R 1 and R 2 represent unsubstituted or substituted hydrocarbon groups having from 1 to 18 carbon atoms and may be the same or different and n is an integer >0.
49 . A process according to claim 33 wherein the catalyst is employed in an amount of from 0.0005 to 5% by mole ratio based on the total silicon containing compounds.
50 . A process according to claim 33 further comprising separation of the catalyst from the organosilicon condensate.
51 . A process according to claim 33 wherein the organosilicon condensate has a viscosity in the range from 1,000 to 4,000 cP.
52 . A process for the preparation of an organosilicon condensate comprising condensing at least one silicon containing compound having:
at least one silanol group (a);
and
at least one —OX group (b),
wherein X is chosen from a group comprising hydrogen, an alkyl group having from 1 to 8 carbon atoms, and an alkoxyalkyl group having from 2 to 8 carbon atoms in the presence of catalyst (c) chosen from a group comprising strontium oxide, barium oxide, strontium hydroxide, barium hydroxide and mixtures thereof.
53 . A process according to claim 52 wherein the catalyst is chosen from a group comprising strontium oxide and barium oxide.
54 . A process according to claim 52 wherein the catalyst is employed in an amount from 0.0005 to 5% by mole ratio based on the total silicon containing compounds.
55 . A process according to claim 52 further comprising separation of the catalyst from the organosilicon condensate.
56 . A process according to claim 52 wherein the organosilicon condensate has a viscosity in the range from 1,000 to 4,000 cP.