Polyfunctional fluorosilicone composition, method for making, and use
First Claim
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1. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
- (A) a silanol terminated fluoroalkyl substituted polydiorganosiloxane, wherein fluoroalkyl substituent groups are C(3-5) polyfluoroalkyl groups;
(B) an oligomeric fluorosilicone crosslinker;
(C) a filler; and
(D) an effective amount of a condensation catalyst.
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Abstract
A fluorosilicone crosslinker and method for making is provided. Reaction is effected between a silanol terminated polyfluoroalkyl silicone fluid and a polyalkoxysilane in the presence of a Platinum Group Metal catalyst. The fluorosilicone crosslinker can be used in combination with a silanol terminated fluoroalkyl substituted polydiorganosiloxane to formulate a neutral, condensation curable, solvent resistant sealant.
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Citations
20 Claims
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1. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
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(A) a silanol terminated fluoroalkyl substituted polydiorganosiloxane, wherein fluoroalkyl substituent groups are C(3-5) polyfluoroalkyl groups;
(B) an oligomeric fluorosilicone crosslinker;
(C) a filler; and
(D) an effective amount of a condensation catalyst. - View Dependent Claims (2, 3, 8, 9, 10, 11, 12, 13)
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8. The sealant composition in accordance with claim 1, where the condensation catalyst comprises an organometallic compound.
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9. The sealant composition in accordance with claim 8, where the organometallic compound comprises dibutyltin diacetate, dimethyltin neodecanoate, dibutyltin dilaurate, stannous octoate, dimethyltin hydroxyoleate, or combinations thereof.
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10. The sealant composition in accordance with claim 9, where the organometallic compound comprises dibutyltin diacetate.
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11. The sealant composition in accordance with claim 1, where the condensation catalyst is present in a range between about 0.1 parts and about 5.0 parts by weight per 100 parts of the of sealant composition.
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12. The sealant composition in accordance with claim 11, where the condensation catalyst is present in a range between about 0.1 parts and about 1.0 parts by weight per 100 parts of the sealant composition.
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13. The sealant composition in accordance with claim 1, where the filler comprises fumed silica.
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4. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
(A) a silanol terminated fluoroalkyl substituted polydiorganosiloxane which comprises organofluorosiloxy units of the formula
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5. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
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(A) a silanol terminated fluoroalkyl substituted polydiorganosiloxane;
(B) an oligomeric fluorosilicone crosslinker which comprises a material having a formula - View Dependent Claims (6, 7)
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14. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
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(A) a silanol terminated C(3-5) polyflouroalkyl substituted polydiorganosiloxane;
(B) an oligomeric fluorosilicone crosslinker;
(C) a filler; and
(D) an effective amount of a condensation catalyst;
wherein the filler is present in an amount up to about 30 parts by weight per 100 parts of the silanol terminated fluoroalkyl substituted polydiorganosiloxane. - View Dependent Claims (15)
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16. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising:
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(A) a silano terminated fluoroalkyl substituted polyorganosiloxane, wherein fluoroalkyl substituent groups are C(3-5) polyfluoroalkyl groups;
(B) an oligomeric fluorosilicone crosslinker;
(C) a filler;
(D) an effective amount of a condensation catalyst; and
(E) a heat stabilizer. - View Dependent Claims (17, 18, 19)
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20. A neutral, room temperature condensation curable, fluorosilicone sealant composition comprising by weight:
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(A) a silanol terminated fluoroalkyl substituted polydiorganosiloxane which comprises trifluoropropyl(methyl)siloxy units present at about 80 parts per 100 parts by weight of the sealant composition, (B) a diethoxymethylsilyl terminated methyltrifluoropropylsiloxane present in a range between about 1 part and about 20 parts by weight per 100 parts of the silanol terminated fluoroalkyl substituted polydiorganosiloxane, (C) fumed silica filler in a range between about 5 parts and about 15 parts by weight per 100 parts of the silanol terminated fluoroalkyl substituted polydiorganosiloxane, and (D) dibutyltin diacetate in a range between about 0.1 parts and about 1 parts by weight per 100 parts of the silanol terminated fluoroalkyl substituted polydiorganosiloxane.
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Specification