EP0725103A2
Expired / Lapsed
EP
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Thermosetting silicone resins
Assignee: DuPont Toray Specialty Materials KK
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Filing: 1996-01-31
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Granted: —
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Expires: 2016-01-31
Abstract
Abstract Described herein is a highly spin-coatable silicone resin that does not produce large amounts of volatiles during its cure, and that is a precursor to highly heat-resistant, optically transparent cured products which exhibit an excellent hardness. The silicone resin comprises a silicone polymer of the general formula: (Ph 2 SiO) a (HSiO 3/2 ) b (R 1 SiO 3/2 ) c in which R 1 is hydrogen atom or a C 1 to C 18 hydrocarbon group, possibly containing a heteroatom, Ph is a phenyl group and 6 ≦ a ̲ + b ̲ + c ̲ ≦ 1,000 , 0.6 > a ̲ /( a ̲ + b ̲ + c ̲ ) ≧ 0.4 , and 1.0 ≧ b ̲ /( b ̲ + c ̲ ) ≧ 0.2 .
Inventors
- 👤 Brian R. c/o Dow Corning Asia Ltd. Harkness
- 👤 Manoru c/o Dow Corning Asia Ltd. Tachikawa
- 👤 Kasumi c/o Dow Corning Asia Ltd. Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 02:00
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C09; C09D; C09D183/00; C09D183/04; C08G77/06; C08G77/12; C08G77/14; C08G77/16; C08G77/80
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
A silicone resin comprising a silicone polymer having the general formula (Ph 2 SiO) a (HSiO 3/2 ) b (R 1 SiO 3/2 ) c wherein each R 1 independently represents C 1 to C 18 hydrocarbon groups which may contain at least one atom selected from the group consisting of oxygen, nitrogen, chlorine, fluorine, and silicon; Ph represents the phenyl group; the other bond of the O may attach to silicon to form a siloxane bond or may attach to a hydrogen atom to form silanol; the average degree of polymerization of the polymer molecule is 6 to 1,000; and the average proportions of the monomer units fall within the range of 0.6 > a ̲ /( a ̲ + b ̲ + c ̲ ) ≧ 0.4 and 1.0 ≧ b ̲ /( b ̲ + c ̲ ) ≧ 0.2 .
Claim 2
Dependent Claim
99 words
A method for preparing the silicone resin of Claim 1 comprising: adding diphenylsilanediol to a material selected from the group consisting of HSiX 3 , or a mixture of HSiX 3 and R 1 SiX 3 , to form a hydrolysis mixture, wherein each X independently denotes a hydrolyzable group selected from the chlorine atom or bromine atom and R 1 independently represents C 1 to C 18 hydrocarbon groups which may contain at least one atom selected from the group consisting of oxygen, nitrogen, chlorine, fluorine, and silicon; and hydrolyzing the hydrolysis mixture at temperatures not exceeding 100°C.
Claim 3
Dependent Claim
46 words
The method of Claim 2, wherein the diphenylsilanediol is added in the presence of an acid acceptor, with the proviso that the amount of acid acceptor is limited to fewer mole-equivalents than the total amount of chlorine and bromine bonded to silicon in the hydrolysis mixture.
Claim 4
Dependent Claim
18 words
The method of claim 2 wherein X is chlorine and R 1 is selected from methyl or phenyl.
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein the acid acceptor is selected from the group consisting of ammonia, alkylamines, aralkylamines, and aromatic amines.
Claim 6
Dependent Claim
17 words
The method of claim 2 wherein the reactants are dissolved in an organic solvent prior to reaction.
Claim 7
Dependent Claim
13 words
The method of claim 2 wherein the reaction temperature does not exceed 50°C.
Claim 8
Dependent Claim
75 words
The method of claim 2 wherein up to 20 wt.% of at least one silane that provides a component selected from the group consisting of (-O) 2 SiR 1 2 ), -OSiR 1 3 , and Si(O-) 4 is included in the reaction mixture, wherein R 1 independently represents C 1 to C 18 hydrocarbon groups which may contain at least one atom selected from the group consisting of oxygen, nitrogen, chlorine, fluorine, and silicon.
Claim 9
Dependent Claim
41 words
A thermosetting polyorganosiloxane composition comprising (a) silicone resin according to Claim 1 and (b) at least one catalytic component selected from the group consisting of basic compounds, divalent and tetravalent tin compounds, palladium metal, platinum metal, palladium compounds, and platinum compounds.
Claim 10
Dependent Claim
43 words
The composition of claim 9 wherein the catalytic component is selected from the group consisting of basic compounds, divalent tin compounds and tetravalent tin compounds and said component is present at 0.01 to 10 weight % based on the amount of silicone resin.
Claim 11
Dependent Claim
44 words
The composition of claim 9 wherein the catalytic component is selected from the group consisting of palladium metal, platinum metal, a palladium compound, or a platinum compound and said component is present at 0.00001 to 1 weight% based on the amount of silicone resin.
Claim 12
Dependent Claim
22 words
A method for curing the silicone resin of claim 1 comprising: heating the silicone resin of Claim 1 at 200°C to 500°C.
Claim 13
Dependent Claim
25 words
A method for curing the thermosetting polyorganosiloxane composition of claim 4 comprising: heating the thermosetting polyorganosiloxane composition of claim 4 at temperatures not exceeding 500°C.
References Cited (Backward Citations)
No citation records indexed.
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