EP0053002A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fluorocarbon polymer compositions
Assignee: Bostik Ltd
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Filing: 1981-11-19
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Granted: —
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Expires: 2001-11-19
Abstract
Abstract The specification describes and claims substantially odourless compositions having a pot life after mixing acceptable for use in manufacture and repair of aircraft and which cure at room temperature to provide a mass of heat and aircraft fuel resistant elastomeric material. The compositions comprise components which are at least substantially free of thiol and comprise a fluorocarbon copolymer, organic solvent, metallic oxide, epoxy compound and as crosslinking agent a diamino silane according to the general formula (i) namely Examples disclose compositions formed from admixture of two components comprising Viton A, methyl ethyl ketone, magnesium oxide, Epikote 828 and N-beta(aminoethyl) gamma-aminopropyl-trimethoxysilane. The compositions are suitable for forming coatings, adhesive bonds and seals, to metal parts of titanium and aluminium alloys which have resistance to aviation fuels and high temperatures. A primer composition for promoting adhesion especially to titanium alloys is described and comprises organic material having isocyanate and hydrolysable silane groups available for reaction e.g. a mixture of polyfunctional isocyanate and a hydrolysable silane of the general formula (ii) namely A preferred example primer comprises liquid MDI and gamma-glycidoxy propyl-trimethoxy-silane.
Inventors
- 👤 Christopher Maclaren Allen
- 👤 Ian Russel Hincklieff
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-25 06:15
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C09; C09D; C09D127/00; C09D127/02; C09D127/12; C08L63/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
98 words
A room temperature curable composition comprising a fluorocarbon copolymer and a metallic oxide, characterised in that the composition is at least substantially free of thiol and comprises a compound having epoxy groups, and as crosslinking agent a diamino silane according to the general formula (i) namely in which R 1 is an aliphatic hydrocarbon residue having 1 to 10 carbon atoms, R 2 is an aliphatic hydrocarbon residue having 1 to 10 carbon atoms, and R 3 , R 4 and R 5 are the same or different monovalent aliphatic hydrocarbon residues having 1 to 5 carbon atoms.
Claim 2
Dependent Claim
98 words
A room temperature curable composition comprising a fluorocarbon copolymer and a metallic oxide, characterised in that the composition is at least substantially free of thiol and comprises a compound having epoxy groups, and as crosslinking agent a diamino silane according to the general formula (i) namely in which R 1 is an aliphatic hydrocarbon residue having 1 to 10 carbon atoms, R 2 is an aliphatic hydrocarbon residue having 1 to 10 carbon atoms, and R 3 , R 4 and R 5 are the same or different monovalent aliphatic hydrocarbon residues having 1 to 5 carbon atoms.
Claim 3
Dependent Claim
55 words
A composition according to claim 1 charact- ised in that the epoxy resin is a liquid reaction product of bisphenol A and epichlorhydrin having an epoxide equivalent of about 185 to about 192, and is present to an extent of from about 2k to about 10 parts by weight per hundred parts by weight copolymer.
Claim 4
Dependent Claim
15 words
A composition according to either one of the preceding claims wherein the silane comprises N-beta(aminoethyl)gamma-aminopropyl-trimethoxysilane.
Claim 5
Dependent Claim
61 words
A composition according to any one of the preceding claims characterised in that the fluorocarbon copolymer is a copolymer of vinylidene fluoride and hexafluoropropylene in the ratio by weight of about 30:70 to 70:30 , and in that the metallic oxide is a magnesium oxide present to an extent of about 10 parts by weight per hundred parts by weight copolymer.
Claim 6
Dependent Claim
33 words
A composition according to any one of the preceding claims characterised in that a reinforcing filler is present to an extent of about 30 parts by weight per 100 parts by weight copolymer.
Claim 7
Dependent Claim
64 words
A composition according to any one of the preceding claims formed by mixing two separate components (A) and (B) in a ratio to provide about 0.25 to about 1.5 parts by weight amino groups of the silane per 100 parts by weight copolymer, the component (B) comprising the silane and the component (A) comprising the copolymer, metallic oxide solvent and compound having epoxy groups.
Claim 8
Independent Claim
101 words
A method of producing a mass of heat and aircraft fuel resistant elastomeric material in the form of a coating bonding layer or sealant mass adherent to one or more substrates of titanium or aluminium alloy characterised by the steps of forming a substantially solvent free primer coating on one or more substrates of titanium or aluminium alloy by application of a primer composition comprising organic material having isocyanate groups and hydrolysable silane groups available for reaction and organic solvent, and providing in contact with the primer coating a room temperature curable composition according to any one of the preceding claims.
Claim 9
Dependent Claim
112 words
A method according to claim 7 characterised in that the primer composition is prepared by admixture of an organic polyisocyanate and a silane according to the general formula (ii) namely in which R 6 is a divalent aliphatic hydrocarbon residue having 1 to 10 carbon atoms, R 7' R S and R 9 are the same or different monovalent aliphatic hydrocarbon residues having 1 to 5 carbon atoms, and, X includes a grouping capable of a chemical reaction by condensation for example an epoxy, mercapto, amino or hydroxy group, the polyisocyanate and silane being used in amounts to provide a ratio of isocyanate groups to groups X of about 10:1 to 15:1.
Claim 10
Dependent Claim
38 words
A method according to claim 8 characterised in that the organic polyisocyanate comprises a 4.4' diphenyl methane diisocyanate partially reacted to include a minor amount or carbodiimide groups and in that the silane of general formula -(ii)--comprises gamma-glycidoxypropyl-trimethoxy-silane.
Claim 11
Independent Claim
35 words
A method according to any one of claims 7 to 9 characterised in that the primer composition comprises a solution of from about 5 to 10% total solids, the organic solvent comprising N-methyl-2-pyrrolidone and toluene.
Claim 12
Independent Claim
41 words
A method according to any one of claims 7 to 10 wherein the room temperature curable composition is provided in the form of a tacky, curable tape, or in the form of a layer deposited on the substrate from a solution.
Claim 13
Dependent Claim
135 words
A room temperature curable composition which is at least substantially free of thiol comprising three components (A), (B) and (C) in which the component (A) comprises a fluorocarbon copolymer, a metallic oxide, a liquid epoxy resin, and organic solvent; the component (B) comprises a silane according to the general formula (i); and the component (C) comprises a primer composition comprising organic material having isocyanate groups and hydrolysable silane groups available for reaction and organic solvent, the composition being such that when the component (C) is applied to titanium substrate as a primer composition and the components (A) and (B) are mixed (in proportions to initiate at room temperature reticulation of the fluorocarbon copolymer) and applied to the primed substrate, the composition cures to provide a heat resistant, fuel resistant layer adhesively bonded to the substrate.
Claim 14
Dependent Claim
135 words
A room temperature curable composition which is at least substantially free of thiol comprising three components (A), (B) and (C) in which the component (A) comprises a fluorocarbon copolymer, a metallic oxide, a liquid epoxy resin, and organic solvent; the component (B) comprises a silane according to the general formula (i); and the component (C) comprises a primer composition comprising organic material having isocyanate groups and hydrolysable silane groups available for reaction and organic solvent, the composition being such that when the component (C) is applied to titanium substrate as a primer composition and the components (A) and (B) are mixed (in proportions to initiate at room temperature reticulation of the fluorocarbon copolymer) and applied to the primed substrate, the composition cures to provide a heat resistant, fuel resistant layer adhesively bonded to the substrate.
References Cited (Backward Citations)
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