EP0657487A2
Expired / Lapsed
EP
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Thermoplastic fluorosilicone resins, their manufacture and use
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1994-12-05
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Granted: —
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Expires: 2014-12-05
Abstract
Abstract Provided is a thermoplastic fluorosilicone resin of the average compositional formula (1): (RfCH2CH2SiO3/2)x(C6H5SiO3/2)y(SiO2)z (1) wherein Rf is a perfluoroalkyl group having 1 to 10 carbon atoms, and x, y, and z are 0.2 </= x </= 0.95, 0 < y </= 0.8, 0 </= z </= 0.05, and x + y + z = 1 and having a softening point of 50-200 DEG C. The fluorosilicone resin is useful for microcapsulating a platinum catalyst for prolonging the pot life of an addition type organopolysiloxane composition and can be used as a coating agent for forming a weather resistant, stainproof, water repellent coating.
Inventors
- 👤 Mitsuhiro C/O Silicone-El.Mat.Lab Takarada
- 👤 Yoshiteru C/O Silicone-El.Mat.Lab Kobayashi
- 👤 Takashi C/O Silicone-El.Mat.Lab Kondou
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 09:34
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/22; C08G77/24; C08K; C08K9/00; C08K9/10; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A thermoplastic fluorosilicone resin having the following average compositional formula (1): (RfCH₂CH₂SiO 3/2 ) x (C₆H₅SiO 3/2 ) y (SiO₂) z (1) wherein Rf is a perfluoroalkyl group having 1 to 10 carbon atoms, and letters x, y, and z are positive numbers in the range: 0.2 ≦ x ≦ 0.95, 0 < y ≦ 0.8, 0 ≦ z ≦ 0,05, and x + y + z = 1, said resin having a softening point in the range of 50 to 200 °C.
Claim 2
Dependent Claim
11 words
A thermoplastic fluorosilicone resin of claim 1, carrying a platinum catalyst.
Claim 3
Independent Claim
203 words
A method for preparing a thermoplastic fluorosilicone resin having the following average compositional formula (1): (RfCH₂CH₂SiO 3/2 ) x (C₆H₅SiO 3/2 ) y (SiO₂) z (1) wherein Rf is a perfluoroalkyl group having 1 to 10 carbon atoms, and letters x, y, and z are positive numbers in the range: 0.2 ≦ x ≦ 0.95, 0 < y ≦ 0.8, 0 ≦ z ≦ 0.05, and x + y + z = 1, said resin having a softening point in the range of 50 to 200 °C, said method comprising the steps of effecting co-hydrolysis of a first organic silicon compound of the following general formula (2): RfCH₂CH₂SiX₃ (2) wherein Rf is as defined above and X is a halogen atom or an alkoxy group having 1 to 6 carbon atoms or a partial hydrolysate thereof, a second organic silicon compound of the following general formula (3): C₆H₅SiX₃ (3) wherein X is as defined above, or a partial hydrolysate thereof, and a third organic silicon compound of the following general formula (4): SiX₄ (4) wherein X is as defined above, or a partial hydrolysate thereof, in a molar ratio x:y:z wherein x, y, and z are as defined above, and polymerizing the co-hydrolysate.
Claim 4
Dependent Claim
46 words
The method of claim 3 wherein in all of formulae (2), (3), and (4), X is an alkoxy group having 1 to 6 carbon atoms, co-hydrolysis is effected in the presence of an acid catalyst, and polymerization is effected in the presence of a basic catalyst.
Claim 5
Dependent Claim
72 words
The method of claim 3 or 4 wherein the fluorosilicone resin resulting from polymerization has residual silanol groups therein, said method further including the step of silylating the residual silanol groups with a fourth organic silicon compound of the following general formula (5): (CH₃)₃SiY (5) wherein Y is selected from the group consisting of a halogen atom, amino group, dimethylamino group, diethylamino group, methyl ethyl ketoxime group, isopropenyloxy group or acetoxy group.
References Cited (Backward Citations)
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