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Patent US3972973A successfully refreshed from Google Patents.
US3972973A
Expired / Lapsed
US
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Method of making rubber and polyester structures
Assignee: Dunlop Ltd
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Filing: 1974-08-19
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Granted: 1976-08-03
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Expires: 1994-08-19
Abstract
Abstract A composite structure comprises an unsaturated hydrocarbon rubber, polychloroprene or a chloroprene/hydrocarbon copolymer bonded without an adhesive layer to a polymer being a reaction product of at least one aliphatic dihydric alcohol and at least one aromatic compound having two acidic groups attached to the aromatic nucleus, or to an elastoplastic linear block copolymer having at least one block of this reaction product. A method of making this structure comprises treating the rubber surface to be bonded with concentrated nitric acid, hypochlorous acid or a hypochlorous acid generator, melting at least the surface of the polymer to be bonded, and solidifying the polymer in contact with the rubber. The invention provides a polyester/rubber structure conveniently without an adhesive interlayer and the structure is useful in applications requiring properties of polyesters and rubbers, for example belting, hose and tires.
Inventors
- 👤 James Frank Yardley
- 👤 Reginald Trevor Wragg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:21
CPC Classifications
F; F16; F16L; F16L33/00; F16L33/34; B; B29; B29C; B29C65/00; B29C65/02; B29C66/00; B29C66/01; B29C66/02; B29C66/026; B29C66/70; B29C66/71; B29C66/73; B29C66/737; B29C66/7375; B29C66/73753; B29C66/73755; B29C66/739; B29C66/7392; B29C66/7394; C; C08; C08J; C08J5/00; C08J5/12; C08J5/121; C08J7/00; C08J7/12; B29C65/82; B29C65/8207; B29C65/8223; B29C66/72; B29C66/721; B29C66/7212; B29C66/7377; B29C66/73771; B29C66/73775; B29K; B29K2007/00; B29K2009/00; B29K2009/06; B29K2019/00; B29K2021/00; B29K2067/00; B29K2067/006; B29K2096/00; B29K2096/04; B29L; B29L2009/00; B29L2023/00; B29L2023/005; B29L2029/00; B29L2030/00; C08J2321/00
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
189 words
A method of making a composite structure of: 1. a vulcanized unsaturated rubber selected from the group consisting of unsaturated hydrocarbon rubbers, polychloroprene and copolymers of chloroprene with at least one copolymerizable hydrocarbon, and 2. a thermoplastic ester-based polymer selected from the group consisting of (A) reaction products of at least one aliphatic dihydric alcohol and at least one aromatic compound having two acidic groups attached to the aromatic nucleus, one being a carbonyl-containing acidic group or an acidic hydroxyl group, and (B) elastoplastic linear block copolymers having at least one block of a reaction product defined in (A), the vulcanized unsaturated rubber being bonded directly to the ester-based polymer without an adhesive interlayer, which comprises i. treating the surface of said vulcanized unsaturated rubber to be bonded to said thermoplastic ester-based polymer with a treatment agent solution selected from the group consisting of concentrated nitric acid, hypochlorous acid and hypochlorous acid generators, ii. heating said thermoplastic ester-based polymer to melt at least the surface to be bonded to said vulcanized unsaturated rubber, and iii. solidifying the molten thermoplastic ester-based polymer in contact with the treated vulcanized unsaturated rubber.
Claim 2
Independent Claim
189 words
A method of making a composite structure of: 1. a vulcanized unsaturated rubber selected from the group consisting of unsaturated hydrocarbon rubbers, polychloroprene and copolymers of chloroprene with at least one copolymerizable hydrocarbon, and 2. a thermoplastic ester-based polymer selected from the group consisting of (A) reaction products of at least one aliphatic dihydric alcohol and at least one aromatic compound having two acidic groups attached to the aromatic nucleus, one being a carbonyl-containing acidic group or an acidic hydroxyl group, and (B) elastoplastic linear block copolymers having at least one block of a reaction product defined in (A), the vulcanized unsaturated rubber being bonded directly to the ester-based polymer without an adhesive interlayer, which comprises i. treating the surface of said vulcanized unsaturated rubber to be bonded to said thermoplastic ester-based polymer with a treatment agent solution selected from the group consisting of concentrated nitric acid, hypochlorous acid and hypochlorous acid generators, ii. heating said thermoplastic ester-based polymer to melt at least the surface to be bonded to said vulcanized unsaturated rubber, and iii. solidifying the molten thermoplastic ester-based polymer in contact with the treated vulcanized unsaturated rubber.
Claim 3
Dependent Claim
23 words
A method according to claim 1 in which the rubber has more than five carbon-carbon double bonds for every 100 main-chain carbon atoms.
Claim 4
Dependent Claim
23 words
A method according to claim 2 in which the rubber has more than 15 carbon-carbon double bonds for every 100 main-chain carbon atoms.
Claim 5
Dependent Claim
33 words
A method according to claim 1 in which the rubber is an unsaturated hydrocarbon rubber selected from the group consisting of linear polymers of cyclic hydrocarbon monoenes and polymers of aliphatic hydrocarbon dienes.
Claim 6
Dependent Claim
30 words
A method according to claim 1 in which the rubber is selected from the group consisting of natural rubber, synthetic cis-polyisoprene, polybutadiene rubber, poly-1,5-pentenamer, polychloroprene, butadiene/styrene rubber and butadiene/alpha-methylstyrene rubber.
Claim 7
Dependent Claim
43 words
A method according to claim 1 in which the ester-based polymer is selected from the group consisting of poly(ethylene terephthalate), poly(butylene terephthalate), poly(1,4-dimethylenecyclohexane terephthalate), 1,4-dimethylenecyclohexane terephthalate/isophthalate copolymer and elastoplastic linear block copolymers having at least one block of a polymer selected from these.
Claim 8
Dependent Claim
37 words
A method according to claim 1 in which the ester-based polymer is an elastoplastic linear block copolymer, from 30 to 60 per cent of which is comprised of at least one block of the reaction product (A).
Claim 9
Dependent Claim
15 words
A method according to claim 1 in which the treatment is performed at room temperature.
Claim 10
Dependent Claim
38 words
A method according to claim 1 in which the hypochlorous acid generator is selected from the group consisting of acidified alkali metal hypochlorites, trichloroisocyanuric acid, alkali metal salts of monochloroisocyanuric acid and alkali metal salts of dichloroisocyanuric acid.
Claim 11
Dependent Claim
20 words
A method according to claim 1 in which the ester-based polymer is applied to the rubber by injection-moulding or transfer-moulding.
Claim 12
Dependent Claim
42 words
A method according to claim 1 in which the ester-based polymer is selected from the group consisting of poly(alkylene terephthalate), poly(alkylene isophthalate), alkylene terephthalate/isophthalate copolymer, poly(paraalkylenoxybenzoate) and elastoplastic linear block copolymers having at least one block of a polymer selected from these.
Claim 13
Dependent Claim
18 words
A method according to claim 11 in which the alkylene groups have from 2 to 8 carbon atoms.
Claim 14
Dependent Claim
70 words
A method according to claim 1 in which the ester-based polymer is an elastoplastic linear block copolymer having: a. n substantially amorphous (in the unstretched state) blocks selected from the group consisting of polyether, aliphatic acid polyester, olefin polymers and at least two interlinked sub-blocks of at least one of these polymers, and b. n + 1 crystalline blocks of the reaction product (A), where n is a positive integer.
Claim 15
Dependent Claim
34 words
A method according to claim 13 in which the substantially amorphous blocks are of a polyether in which the carbon to oxygen ratio in the repeating unit of the polyether is greater than 2.5:1.
Claim 16
Dependent Claim
12 words
A method according to claim 14 in which the polyether is polytetrahydrofuran.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |