EP0589440A2
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EP
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Method of producing branched polyorganosiloxane
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1993-09-22
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Granted: —
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Expires: 2013-09-22
Abstract
Abstract A method is provided for producing a branched polyorganosiloxane to use in improving properties of silicone oil fluid. The method eliminates the occurrence of by-products, such as hydrochloric acid, which easily decompose the branched polyorganosiloxane. This method of producing a branched polyorganosiloxane involves reacting a compound which has at least three silanol groups per molecule and which is soluble in an organic solvent with a linear polydiorganosiloxane having a polymerization degree of at least three and having only one chain end terminated with a group containing a nitrogen atom which is bonded to a silicon atom.
Inventors
- 👤 Takuya C/O Dow Dorning Asia Ltd. Ogawa
- 👤 Toshio C/O Dow Corning Asia Ltd. Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 17:47
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/42; C08G77/44; C08G77/04; C08G77/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A method of making a branched polyorganosiloxane comprising: reacting a compound which has at least three silanol groups per molecule and which is soluble in an organic solvent with a linear polydiorganosiloxane having a polymerization degree of at least three and having only one chain end terminated with a group containing a nitrogen atom which is bonded to a silicon atom.
Claim 2
Dependent Claim
56 words
A method according to claim 1, wherein the compound with at least three silanol groups per molecule is a silicone resin having at least one unit selected from R¹₃SiO 1/2 , R²₂SiO, R³SiO 3/2 and SiO 4/2 , where each R¹, R² and R³ is independently selected from hydrogen atom, alkyl, aryl, alkenyl, and halogenated alkyl.
Claim 3
Dependent Claim
29 words
A method according to claim 2, wherein each R¹, R², and R³ is independently selected from hydrogen atom, methyl, ethyl, propyl, phenyl, vinyl, allyl, hexenyl, chloromethyl, chloropropyl and trifluoropropyl.
Claim 4
Dependent Claim
26 words
A method according to claim 2, wherein the compound with at least three silanol groups per molecule is selected from organosilane triol, poly(hydroxydiorganosilyl)benzene, poly(hydroxydiorganosilyl)alkane, and poly(hydroxydiorganosilyl)alkene.
Claim 5
Dependent Claim
41 words
A method according to claim 1, wherein the linear polydiorganosiloxane having one chain end terminated with a group containing a nitrogen atom is selected from alkylamino, dialkylamino, alkenylamino, dialkenylamino, anilino, N-alkylacetamido, propionamido, N-alkylpropionamido, phthalimido, succinimido, isocyano, thioisocyano, piperidino, morpholino, and N-imidazolinyl.
Claim 6
Dependent Claim
68 words
A method according to claim 1, wherein the degree of polymerization of the linear polydiorganosiloxane is in a range of three to 1,000; organic groups bonded to silicon atoms of the linear polydiorganosiloxane are independently selected from alkyl, aryl, alkenyl, and halogenated alkyl; and the chain end of the linear polydiorganosiloxane opposite the end terminated with a group containing a nitrogen atom is terminated with a triorganosilyl group.
Claim 7
Dependent Claim
58 words
A method according to claim 6, wherein the degree of polymerization of the linear polydiorganosiloxane is in a range of three to 500; organic groups bonded to silicon atoms of the linear polydiorganosiloxane are independently selected from methyl, ethyl, propyl, phenyl, vinyl, allyl, hexenyl, chloromethyl, chloropropyl and trifluoropropyl; and the triorganosilyl group is selected from dimethylvinylsilyl and trimethylsilyl.
Claim 8
Dependent Claim
21 words
A method according to claim 7, wherein the organic groups of the linear polydiorganosiloxane are independently selected from methyl and 3,3,3-trifluoropropyl.
Claim 9
Dependent Claim
151 words
A method according to claim 1, wherein the compound which has at least three silanol groups per molecule and which is soluble in an organic solvent is a silicone resin having at least one unit selected from a group consisting of R¹₃SiO 1/2 , R²₂SiO, R³SiO 3/2 and SiO 4/2 , where R¹, R² and R³ are independently selected alkyl, aryl, alkenyl, and halogenated alkyl; the degree of polymerization of the linear polydiorganosiloxane is in a range of three to 1,000; organic groups bonded to silicon atoms of the linear polydiorganosiloxane are independently selected from alkyl, aryl, alkenyl, and halogenated alkyl; the chain end of the linear polydiorganosiloxane opposite the end terminated with a group containing a nitrogen atom is terminated with a triorganosilyl group; and the group containing a nitrogen atom is selected from alkylamino, dialkyl-amino, alkenylamino, dialkenylamino, anilino, N-alkylacetamido, propionamido, N-alkylpropionamido, phthalimido, succinimido, isocyano, thioisocyano, piperidino, morpholino, and N-imidazolinyl.
References Cited (Backward Citations)
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