US5210131A
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Method of making organopolysiloxanes
Assignee: Dow Silicones Belgium SPRL
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Filing: 1992-02-06
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Granted: 1993-05-11
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Expires: 2012-02-06
Abstract
Abstract A method of making organopolysiloxanes comprises contacting organosilicon compounds having at least one unit ##EQU1## wherein R° is hydrogen, hydroxyl, a C 1-18 hydrocarbon, substituted hydrocarbon or hydrocarbonoxy group and a has a value of from 0 to 4 with a phosphonitrile halide AB, wherein A is a phosphonitrile halide cation [X(PX 2 ═N) n PX 3 ] + , wherein X is halide and n is from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom, e.g. [MX.sub.(v-t+1) R 2 t ] - . The method is particularly useful for condensation of silanol end-blocked siloxanes.
Inventors
- 👤 Jean-Marc Gilson
- 👤 Jean de la Croi Habimana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:58
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/06; C08G77/08; C08L; C08L83/00; C08L83/04; C08G77/12; C08G77/14; C08G77/16; C08G77/18; C08G77/70
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
136 words
A method of making organopolysiloxanes which comprises contacting one or more organosilicon compounds having at least one unit of the general formula ##EQU3## wherein R° is selected from a hydrogen atom, a hydroxyl group, a hydrocarbon group having from 1 to 18 carbon atoms, a substituted hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms and a has a value of from 0 to 4 with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula [X(PX 2 ═N) n PX 3 ] + , wherein X denotes a halide atom and n has a value of from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom.
Claim 2
Independent Claim
136 words
A method of making organopolysiloxanes which comprises contacting one or more organosilicon compounds having at least one unit of the general formula ##EQU3## wherein R° is selected from a hydrogen atom, a hydroxyl group, a hydrocarbon group having from 1 to 18 carbon atoms, a substituted hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms and a has a value of from 0 to 4 with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula [X(PX 2 ═N) n PX 3 ] + , wherein X denotes a halide atom and n has a value of from 1 to 8 and B is an anion derived from a Lewis acid not containing a P atom.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein the organosilicon compounds are linear organosiloxane polymers.
Claim 4
Dependent Claim
25 words
A method according to claim 1, wherein at least 80% of all R° groups in the organosilicon compounds are selected from methyl or phenyl groups.
Claim 5
Dependent Claim
86 words
A method according to claim 1 in which the phosphonitrile halide catalyst has the general formula [X(PX 2 ═N) n PX 3 ] + [MX.sub.(v-t+1) R 2 t ] - wherein X denotes a halide atom, M is an element having an electronegativity on Pauling's scale of from 1.0 to 2.0, R 2 is an alkyl group having up to 12 carbon atoms, n is an integer with a value of from 1 to 8, v is the valence or oxidation state of M and 0<t<v.
Claim 6
Dependent Claim
17 words
A method according to claim 4 wherein the phosphonitrile halide catalyst each X denotes a chlorine atom.
Claim 7
Dependent Claim
21 words
A method according to claim 1 wherein the value of n in the phosphonitrile halide catalyst is from 2 to 4.
Claim 8
Dependent Claim
21 words
A method according to claim 4 wherein the value of n in the phosphonitrile halide catalyst is from 2 to 4.
Claim 9
Dependent Claim
18 words
A method according to claim 1 wherein the value of t in the phosphonitrile halide catalyst is zero.
Claim 10
Dependent Claim
35 words
A method according to claim 1 wherein the anion contains an element M in the phosphonitrile halide catalyst and is selected to have an electronegativity value according to Pauling's scale of from 1.2 to 1.9.
Claim 11
Dependent Claim
29 words
A method according to claim 4 wherein M in the phosphonitrile halide catalyst is selected to have an electronegativity value according to Pauling's scale of from 1.2 to 1.9.
Claim 12
Dependent Claim
44 words
A method according to claim 1 wherein the anion contains an element M in the phosphonitrile halide catalyst and is selected to maximise the difference in electronegativity value according to Pauling's scale between the phophorus atom of part A of the catalyst and M.
Claim 13
Dependent Claim
32 words
A method according to claim 1 wherein the phosphonitrile halide catalyst is present in a ratio of from 1 to 500 ppm by weight based on the weight of the organosilicon compounds.
Claim 14
Dependent Claim
31 words
A method according to claim 4 wherein the phosphonitrile halide catalyst is present in a ratio of from 1 to 500ppm by weight based on the weight of the organosilicon compounds.
Claim 15
Dependent Claim
32 words
A method according to claim 1 wherein the phosphonitrile halide catalyst is present in a ratio of from 5 to 50 ppm by weight based on the weight of the organosilicon compounds.
Claim 16
Dependent Claim
32 words
A method according to claim 4 wherein the phosphonitrile halide catalyst is used in a ratio of from 5 to 50 ppm by weight based on the weight of the organosilicon compounds.
Claim 17
Dependent Claim
26 words
A method according to claim 1 which also comprises the neutralisation of the phosphonitrile halide catalyst with an alkaline material after the organosiloxanes have been made.
Claim 18
Dependent Claim
26 words
A method according to claim 4 which also comprises the neutralisation of the phosphonitrile halide catalyst with an alkaline material after the organosiloxanes have been made.
Claim 19
Independent Claim
171 words
A method of making organopolysiloxane having the general formula R° (R 1 2 SiO) p SiR 1 2 R° , wherein R° is selected from a hydrogen atom, a hydroxyl group, a hydrocarbon group having from 1 to 18 carbon atoms, a substituted hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms, R1 denotes the same groups as R° except for hydroxyl groups and p is an integer, which comprises contacting one or more organosilicon compounds of the general formula HO---(R 1 2 SiO) q --H, wherein R1 is as defined above, q denotes an integer which is substantially smaller than p with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula {X(PX 2 ═N) n PX 3 }+, wherein X denotes a halide atom and n has a value of from 1 to 8, and B is an anion derived from a Lewis acid not containing a P atom.
Claim 20
Independent Claim
171 words
A method of making organopolysiloxane having the general formula R° (R 1 2 SiO) p SiR 1 2 R° , wherein R° is selected from a hydrogen atom, a hydroxyl group, a hydrocarbon group having from 1 to 18 carbon atoms, a substituted hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms, R1 denotes the same groups as R° except for hydroxyl groups and p is an integer, which comprises contacting one or more organosilicon compounds of the general formula HO---(R 1 2 SiO) q --H, wherein R1 is as defined above, q denotes an integer which is substantially smaller than p with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula {X(PX 2 ═N) n PX 3 }+, wherein X denotes a halide atom and n has a value of from 1 to 8, and B is an anion derived from a Lewis acid not containing a P atom.
Claim 21
Independent Claim
178 words
A method of making organopolysiloxanes having the general formula R 1 (R 1 2 SiO) p SiR 1 2 R 1 , wherein R1 denotes a hydrogen atom, a hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms, and p is an integer, which comprises contacting one or more organosilicon compounds of the general formula R 1 (R 1 2 SiO) q SiR 1 3 and/or organosilicon compounds of the general formula (R 1 2 SiO) S , wherein R1 is as defined above and s denotes an integer with a value of from 3 to about 10 and q denotes an integer which is substantially smaller than p with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula {X(PX 2 ═N) n PX 3 }+, wherein X denotes a halide atom and n has a value of from 1 to 8, and B is an anion derived from a Lewis acid not containing a P atom.
Claim 22
Independent Claim
178 words
A method of making organopolysiloxanes having the general formula R 1 (R 1 2 SiO) p SiR 1 2 R 1 , wherein R1 denotes a hydrogen atom, a hydrocarbon group having from 1 to 18 carbon atoms or a hydrocarbonoxy group having up to 18 carbon atoms, and p is an integer, which comprises contacting one or more organosilicon compounds of the general formula R 1 (R 1 2 SiO) q SiR 1 3 and/or organosilicon compounds of the general formula (R 1 2 SiO) S , wherein R1 is as defined above and s denotes an integer with a value of from 3 to about 10 and q denotes an integer which is substantially smaller than p with a phosphonitrile halide which has the general formula AB, wherein A is a phosphonitrile halide cation of the general formula {X(PX 2 ═N) n PX 3 }+, wherein X denotes a halide atom and n has a value of from 1 to 8, and B is an anion derived from a Lewis acid not containing a P atom.
Claim 23
Dependent Claim
30 words
A method according to claim 18 wherein organopolysiloxanes are made wherein each R° denotes a group R 1 , which includes adding reagents which act as endblockers for the organopolysiloxanes.
Claim 24
Dependent Claim
21 words
A method according to claim 18 wherein there are also present with the organosilicon compounds silica filler materials for the organopolysiloxanes.
References Cited (Backward Citations)
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