US4173486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coating of glass fibres
Assignee: Pilkington Group Ltd
•
Filing: 1977-11-08
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Granted: 1979-11-06
•
Expires: 1997-11-08
Abstract
Abstract A method of coating glass fibres to protect them from deterioration in an alkaline environment such as a Portland cement matrix, in which the glass fibres are coated with a composition containing a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent, the composition is cured and dried at elevated temperature so as to cross-link hydroxyl groups of the film-forming material and thereby form a thermoset film coating on the glass fibres which also retains the ester. The ester acts as a protective material to protect the glass fibres from alkaline attack.
Inventors
- 👤 Colin J. Cheetham
- 👤 Phillip Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:05
CPC Classifications
C; C03; C03C; C03C25/00; C03C25/10; C03C25/1025; C03C25/103; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2962; Y10T428/2964
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
116 words
A method of coating glass fibres to protect them from deterioration in an alkaline environment, such as a Portland cement matrix, said method comprising the steps of applying to the glass fibres an aqueous composition containing a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent, and drying and curing the composition at elevated temperature so as to cause cross-linking of the hydroxyl groups of the film-forming material, thereby to form a thermoset film coating on the glass fibres which also retains the ester.
Claim 2
Independent Claim
116 words
A method of coating glass fibres to protect them from deterioration in an alkaline environment, such as a Portland cement matrix, said method comprising the steps of applying to the glass fibres an aqueous composition containing a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent, and drying and curing the composition at elevated temperature so as to cause cross-linking of the hydroxyl groups of the film-forming material, thereby to form a thermoset film coating on the glass fibres which also retains the ester.
Claim 3
Dependent Claim
21 words
A method according to claim 1, wherein the ester contains at least one free unreacted aliphatic hydroxyl group in the molecule.
Claim 4
Dependent Claim
34 words
A method according to claim 1, wherein the film-forming material is the product of reacting an epoxide compound with a secondary amine in such manner as to remove all the epoxy groups originally present.
Claim 5
Dependent Claim
56 words
A method according to claim 1, wherein the film-forming material is the product of reacting an epoxide compound with a secondary amine in such manner as to remove such a proportion of the epoxy groups originally present as is necessary to make the product soluble in water or in dilute organic acids, such as acetic acid.
Claim 6
Dependent Claim
19 words
A method according to claim 3, wherein the epoxide compound is a product of reacting bisphenol A with epichlorhydrin.
Claim 7
Dependent Claim
16 words
A method according to claim 3, wherein the secondary amine is diethanolamine, morpholine, piperidine or pyrrole.
Claim 8
Dependent Claim
32 words
A method according to claim 1, wherein the film-forming material is the product of reacting epichlorhydrin with a secondary amine and subsequently reacting the product with a primary hydroxyamine such as ethanolamine.
Claim 9
Dependent Claim
15 words
A method according to claim 1, wherein the ester is an ester of gallic acid.
Claim 10
Dependent Claim
17 words
A method according to claim 1, wherein the ester is an ester of a dihydroxy benzoic acid.
Claim 11
Dependent Claim
24 words
A method according to claim 8, wherein the esterifying alcohol is ethylene glycol, glycerol or a polyethylene glycol with a molecular weight below 600.
Claim 12
Dependent Claim
27 words
A method according to claim 1, wherein the cross-linking agent is an amino-plast, having one or more melamine rings and substituted with methylol and/or esterified methylol groups.
Claim 13
Dependent Claim
15 words
A method according to claim 11, wherein the esterified methylol groups are esterified with methanol.
Claim 14
Dependent Claim
59 words
A method according to claim 1, wherein the aqueous composition is applied to continuous filaments of glass as the filaments are being drawn from a body of molten glass through a bushing, and the drying and curing is effected after the filaments have been grouped into bundles or strands and wound on to a former to give a cake.
Claim 15
Dependent Claim
25 words
A method according to claim 13, wherein the aqueous composition also contains a silane which assists in bonding the film-forming material to the glass surface.
Claim 16
Dependent Claim
25 words
A method according to claim 13, wherein the aqueous composition also contains a size lubricant to reduce friction between the coated surfaces of adjacent filaments.
Claim 17
Dependent Claim
10 words
Glass fibres coated by a method according to claim 1.
Claim 18
Dependent Claim
61 words
An aqueous coating composition for use in coating glass fibres by the method of claim 1, said composition containing a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent.
Claim 19
Dependent Claim
18 words
A cement composite material formed by incorporating coated glass fibres according to claim 16 in a cement matrix.
Claim 20
Dependent Claim
15 words
A cement composite material according to claim 18, wherein the cement matrix incorporates reactive silica.
Claim 21
Dependent Claim
25 words
A cement composite material according to claim 19, wherein the reactive silica is in the form of fine silica flour or of a pozzolanic material.
Claim 22
Dependent Claim
23 words
A cement composite material according to claim 19, wherein the cement matrix contains between 10% and 40% by weight of the reactive silica.
Claim 23
Dependent Claim
52 words
Glass fibres coated with an aqueous coating composition which contains a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent.
Claim 24
Dependent Claim
52 words
Glass fibres coated with an aqueous coating composition which contains a water-soluble film-forming material having free aliphatic hydroxyl groups in the molecule, a water-soluble ester formed by reaction of a tri-hydroxy- or di-hydroxy-substituted aromatic carboxylic acid with an alcohol having at least two hydroxyl groups in the molecule, and a cross-linking agent.
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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) | 1982-11-05 | 1983-05-07 | 1983-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-11-05 | 1987-05-07 | 1987-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-11-05 | 1991-05-07 | 1991-11-06 | $7700.00 | Window Closed / Lapsed |