US4735833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Curable fabric member
Assignee: Raychem Ltd
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Filing: 1985-12-03
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Granted: 1988-04-05
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Expires: 2005-12-03
Abstract
Abstract A latent curing fibre is produced by coating a glass fibre with an (optional) thermoplastic (polyamide) adhesion-promoting layer, a (preferably brittle) curing agent layer (e.g. styrene/maleic anhydride), and a flexible curable layer of epoxy plus curable polyester. Composites of this fibre with non-reactive glass braids consolidate and cure exceptionally well under a heat-shrink sleeve to provide Class F electrical insulation.
Inventors
- 👤 Achilles Chiotis
- 👤 Darren J. Collett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:35
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; C; C08; C08J; C08J3/00; C08J3/24; C08J3/241; C08J5/00; C08J5/04; C08J5/06; C08J5/24; C08J5/248; H01B3/40; Y; Y10; Y10S; Y10S174/00; Y10S174/08; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/249921; Y10T428/249924; Y10T428/24994; Y10T428/249948; Y10T428/31504; Y10T428/31511; Y10T428/31525; Y10T442/00; Y10T442/60; Y10T442/603; Y10T442/604; Y10T442/674
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
78 words
A heat-curable fabric member comprising a filamentary support, a first layer of adhesion-promoting material on the support, a heat-flowable second layer comprising one or more curing agents, and a flexible heat-flowable third layer comprising curable polymeric material, said three layers being separate, the adhesion-promoting material causing at least the second layer to adhere to the support and the curable material undergoing a curing reaction with the curing agent(s) when their respective layers are heated to a flowable state.
Claim 2
Dependent Claim
78 words
A heat-curable fabric member comprising a filamentary support, a first layer of adhesion-promoting material on the support, a heat-flowable second layer comprising one or more curing agents, and a flexible heat-flowable third layer comprising curable polymeric material, said three layers being separate, the adhesion-promoting material causing at least the second layer to adhere to the support and the curable material undergoing a curing reaction with the curing agent(s) when their respective layers are heated to a flowable state.
Claim 3
Dependent Claim
87 words
A heat-curable fabric member comprising a filamentary support, a first heat-flowable layer comprising one or more curing agents and a second heat-flowable curable layer which is brittle and comprises brittle curable polymeric material and a further polymeric material which flexibilizes the brittle curable material, said first and second layers being separate, the curable layer forming an outer surface of the fabric member, and at least the brittle curable material undergoing a curing reaction with the curing agent(s) when their respective layers are heated to a flowable state.
Claim 4
Dependent Claim
87 words
A heat-curable fabric member comprising a filamentary support, a first heat-flowable layer comprising one or more curing agents and a second heat-flowable curable layer which is brittle and comprises brittle curable polymeric material and a further polymeric material which flexibilizes the brittle curable material, said first and second layers being separate, the curable layer forming an outer surface of the fabric member, and at least the brittle curable material undergoing a curing reaction with the curing agent(s) when their respective layers are heated to a flowable state.
Claim 5
Dependent Claim
35 words
A fabric member according to claim 2, wherein the flexibilising further polymeric material is curable and also undergoes a curing reaction with the curing agent(s) when their respective layers are heated to a flowable state.
Claim 6
Dependent Claim
16 words
A fabric member according to claim 2, wherein the brittle curable material is an epoxy material.
Claim 7
Dependent Claim
15 words
A fabric member according to claim 2, wherein the further polymeric material is a polyester.
Claim 8
Dependent Claim
37 words
A fabric member according to claim 2 comprising a flexible first layer of adhesion-promoting material on the support, a second layer comprising the curing agent, and a third layer comprising the brittle material and further polymeric material.
Claim 9
Dependent Claim
27 words
A fabric member according to claim 1, wherein the second layer is carried on the first layer and the third layer is carried on the second layer.
Claim 10
Dependent Claim
39 words
A fabric member according to claim 1, wherein the adhesion-promoting material of the first layer has a softening or melting point not more than 20 C.°, preferably not more than 10 C.°, different from that of the second layer.
Claim 11
Dependent Claim
14 words
A fabric member according to claim 1, wherein the curing agent layer is brittle.
Claim 12
Dependent Claim
17 words
A fabric member according to claim 1, wherein the respective layers on the support are substantially concentric.
Claim 13
Dependent Claim
21 words
A fabric member according to claim 1, wherein the support has a softening or melting temperature higher than the curing temperature.
Claim 14
Dependent Claim
24 words
A fabric member according to claim 1, wherein the curable material comprises epoxy material and the curing agent comprises a solid anhydride curing agent.
Claim 15
Dependent Claim
15 words
A fabric member according to claim 1, wherein the curing agent comprises styrene-maleic anhydride adduct.
Claim 16
Dependent Claim
23 words
A fabric member according to claim 1 having a thermoplastic polymer, preferably a polyester or polyamide, as the adhesion-promoting material on the support.
Claim 17
Dependent Claim
14 words
A fabric member according to claim 1 incorporating a plasticiser for the adhesion-promoting material.
Claim 18
Dependent Claim
12 words
A fabric comprising one or more fabric members according to claim 1.
Claim 19
Dependent Claim
17 words
A fabric comprising one or more fabric members according to claim 1, which fabric has been cured.
Claim 20
Dependent Claim
18 words
Class F electrical insulation comprising at least one fabric member according to claim 1, which has been cured.
Claim 21
Dependent Claim
33 words
A composite assembly of curable fabric members according to claim 1, together with other non-curable fabric members, arranged so that the composite can be consolidated and cured by application of heat and pressure.
Claim 22
Dependent Claim
28 words
A composite assembly according to claim 19 associated with a dimensionally recoverable driver so that recovery of the driver in use compresses the composite to assist consolidation thereof.
Claim 23
Dependent Claim
17 words
A composite assembly according to claim 20 wherein the driver is a tubular member of polyvinylidene fluoride.
Claim 24
Dependent Claim
29 words
A composite assembly according to claim 19 comprising a tubular layer of the non-curable fabric members at least partly telescoped inside a tubular layer of the curable fabric members.
Claim 25
Dependent Claim
28 words
A composite assembly according to claim 22, comprising a further tubular layer of the curable fabric members at least partly telescoped inside the layer of non-curable fabric members.
Claim 26
Dependent Claim
17 words
A composite assembly according to claim 19, wherein the fabric members are in the form of fabric(s).
Claim 27
Dependent Claim
13 words
A composite assembly according to claim 19, which has been consolidated and cured.
Claim 28
Dependent Claim
19 words
A composite assembly according to claim 19, which has been consolidated and cured and is serving as electrical insulation.
Claim 29
Dependent Claim
38 words
A method of making a reinforced cured composite structure comprising arranging on a substrate a layer comprising at least one curable fabric member according to claim 1, and applying heat and pressure to consolidate and cure the structure.
Claim 30
Dependent Claim
27 words
A method according to claim 27 comprising arranging a layer of non-curable fabric members between the curable layer and the substrate before consolidating and curing the structure.
Claim 31
Dependent Claim
35 words
A method according to claim 28 comprising arranging a further layer comprising at least one curable fabric member according to claim 1, between the non-curable layer and the substrate before consolidating and curing the structure.
Claim 32
Dependent Claim
16 words
A method according to claim 27, wherein a heat-recoverable article is used to consolidate the structure.
Claim 33
Dependent Claim
19 words
An electric motor comprising electrical insulation produced by consolidation and curing of a composite assembly according to claim 19.
Claim 34
Dependent Claim
25 words
An electric motor comprising electrical insulation produced by heat recovery of the driver to consolidate and cure a composite assembly as claimed in claim 20.
Claim 35
Dependent Claim
30 words
A composite assembly according to claim 19, wherein the curable fabric members are confined to or concentrated in selected portions of the assembly by patterned layering, weaving, knitting or braiding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-04-05 | 1991-10-05 | 1992-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-04-05 | 1995-10-05 | 1996-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-04-05 | 1999-10-05 | 2000-04-05 | $7700.00 | Window Closed / Lapsed |