US4469748A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adhesion of aramid cords to rubber
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1983-07-05
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Granted: 1984-09-04
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Expires: 2003-07-05
Abstract
Abstract An aramid reinforcing element is treated with a cold gas plasma of air, N 2 , He, Ne or Ar or mixture thereof at up to 300 watts power for a few seconds to several minutes to improve its adhesion to rubber compounds.
Inventors
- 👤 Satish C. Sharma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:31
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; D; D06; D06M; D06M10/00; D06M10/02; D06M10/025; C08J2321/00; D06M2101/00; D06M2101/16; D06M2101/30; D06M2101/34; D06M2101/36; D06M2200/00; D06M2200/50; Y; Y10; Y10S; Y10S156/00; Y10S156/91; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2938; Y10T428/2964; Y10T428/2967; Y10T428/2969; Y10T442/00; Y10T442/30; Y10T442/3854; Y10T442/3911
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
213 words
A method for adhering a poly(p-phenylene terephthalamide) reinforcing element to a rubber compound which comprises (I) treating said element with a composition comprising an aqueous alkaline dispersion of about 10 to 50% by weight of solids comprising (a) a rubbery vinyl pyridine copolymer and (b) a water soluble thermosetting phenolic-aldehyde resin in an amount of from about 3 to 25 parts by weight dry per 100 parts total by weight dry of (a), heating said treated element at a temperature of from about 200° to 600° F. for from about 300 to 5 seconds to remove essentially all of the water from said composition and to provide said element with a heat cured or heat set dry adhesive in an amount of up to about 20% total by weight (dry) based on the weight of said reinforcing element, and (II) combining said dried and heat cured adhesive containing reinforcing element with an unvulcanized vulcanizable rubber compound and vulcanizing the same, said reinforcing element prior to treatment with said composition having been treated in a cold gas plasma for from about 2 seconds to 30 minutes at from about 10 to 300 watts of power where said gas is selected from the group consisting of air, nitrogen, helium, neon and argon and mixture thereof.
Claim 2
Independent Claim
213 words
A method for adhering a poly(p-phenylene terephthalamide) reinforcing element to a rubber compound which comprises (I) treating said element with a composition comprising an aqueous alkaline dispersion of about 10 to 50% by weight of solids comprising (a) a rubbery vinyl pyridine copolymer and (b) a water soluble thermosetting phenolic-aldehyde resin in an amount of from about 3 to 25 parts by weight dry per 100 parts total by weight dry of (a), heating said treated element at a temperature of from about 200° to 600° F. for from about 300 to 5 seconds to remove essentially all of the water from said composition and to provide said element with a heat cured or heat set dry adhesive in an amount of up to about 20% total by weight (dry) based on the weight of said reinforcing element, and (II) combining said dried and heat cured adhesive containing reinforcing element with an unvulcanized vulcanizable rubber compound and vulcanizing the same, said reinforcing element prior to treatment with said composition having been treated in a cold gas plasma for from about 2 seconds to 30 minutes at from about 10 to 300 watts of power where said gas is selected from the group consisting of air, nitrogen, helium, neon and argon and mixture thereof.
Claim 3
Dependent Claim
26 words
A method according to claim 1 where said plasma is conducted from about 2 L to 20 minutes at about 25 to 75 watts of power.
Claim 4
Dependent Claim
11 words
A method according to claim 2 where said gas is nitrogen.
Claim 5
Dependent Claim
11 words
A method according to claim 2 where said gas is argon.
Claim 6
Dependent Claim
22 words
A method according to claim 1 where in (b) the resin comprises a mixture of a resorcinol-formaldehyde resin and a phenol-formaldehyde resin.
Claim 7
Dependent Claim
15 words
A method according to claim 1 where in (b) the resin comprises a resorcinol-formaldehyde resin.
Claim 8
Dependent Claim
126 words
A method according to claim 1 wherein said rubbery vinyl pyridine copolymer of (a) is a terpolymer of from about 60 to 80% by weight of butadiene-1,3, from about 7 to 32% by weight of styrene, and from about 4 to 22% by weight of 2-vinyl pyridine, wherein said phenolic-aldehyde resin of (b) is used in an amount of from about 6 to 20 parts by weight dry per 100 parts total by weight dry of (a), wherein said phenolic-aldehyde resin of (b) comprises a mixture of a phenol-formaldehyde resin and a resorcinol-formaldehyde resin, wherein said reinforcing agent contains up to about 15% total by weight of said dry adhesive and wherein the solids content of said dispersion is from about 20 to 25% by weight.
Claim 9
Independent Claim
183 words
A method which comprises (I) treating a poly(p-phenylene terephthalamide) reinforcing element with a composition comprising an aqueous alkaline dispersion of about 10 to 50% by weight of solids comprising (a) a rubbery vinyl pyridine copolymer and (b) a water soluble thermosetting phenolic-aldehyde resin in an amount of from about 3 to 25 parts by weight dry per 100 parts total by weight dry of (a), heating said treated element at a temperature of from about 200° to 600° F. for from about 300 to 5 seconds to remove essentially all of the water from said composition and to provide said element with a heat cured or heat set dry adhesive in an amount of up to about 20% total by weight (dry) based on the weight of said reinforcing element, said reinforcing element prior to treatment with said composition having been treated in a cold gas plasma for from about 2 seconds to 30 minutes at from about 10 to 300 watts of power where said gas is selected from the group consisting of air, nitrogen, helium, neon and argon and mixture thereof.
Claim 10
Independent Claim
183 words
A method which comprises (I) treating a poly(p-phenylene terephthalamide) reinforcing element with a composition comprising an aqueous alkaline dispersion of about 10 to 50% by weight of solids comprising (a) a rubbery vinyl pyridine copolymer and (b) a water soluble thermosetting phenolic-aldehyde resin in an amount of from about 3 to 25 parts by weight dry per 100 parts total by weight dry of (a), heating said treated element at a temperature of from about 200° to 600° F. for from about 300 to 5 seconds to remove essentially all of the water from said composition and to provide said element with a heat cured or heat set dry adhesive in an amount of up to about 20% total by weight (dry) based on the weight of said reinforcing element, said reinforcing element prior to treatment with said composition having been treated in a cold gas plasma for from about 2 seconds to 30 minutes at from about 10 to 300 watts of power where said gas is selected from the group consisting of air, nitrogen, helium, neon and argon and mixture thereof.
Claim 11
Dependent Claim
25 words
A method according to claim 8 where said plasma is conducted from about 2 to 20 minutes at about 25 to 75 watts of power.
Claim 12
Dependent Claim
11 words
A method according to claim 9 where said gas is nitrogen.
Claim 13
Dependent Claim
11 words
A method according to claim 9 where said gas is argon.
Claim 14
Dependent Claim
22 words
A method according to claim 8 where in (b) the resin comprises a mixture of a resorcinol-formaldehyde resin and a phenol-formaldehyde resin.
Claim 15
Dependent Claim
15 words
A method according to claim 8 where in (b) the resin comprises a resorcinol-formaldehyde resin.
Claim 16
Dependent Claim
126 words
A method according to claim 8 wherein said rubbery vinyl pyridine copolymer of (a) is a terpolymer of from about 60 to 80% by weight of butadiene-1,3, from about 7 to 32% by weight of styrene, and from about 4 to 22% by weight of 2-vinyl pyridine, wherein said phenolic-aldehyde resin of (b) is used in an amount of from about 6 to 20 parts by weight dry per 100 parts total by weight dry of (a), wherein said phenolic-aldehyde resin of (b) comprises a mixture of a phenol-formaldehyde resin and a resorcinol-formaldehyde resin, wherein said reinforcing agent contains up to about 15% total by weight of said dry adhesive and wherein the solid contents of said dispersion is from about 20 to 25% by weight.
Claim 17
Dependent Claim
9 words
The product produced by the method of claim 1.
Claim 18
Dependent Claim
9 words
The method produced by the method of claim 2.
Claim 19
Dependent Claim
9 words
The product produced by the method of claim 3.
Claim 20
Dependent Claim
9 words
The product produced by the method of claim 4.
Claim 21
Dependent Claim
9 words
The product produced by the method of claim 5.
Claim 22
Dependent Claim
9 words
The product produced by the method of claim 6.
Claim 23
Dependent Claim
9 words
The product produced by the method of claim 7.
Claim 24
Dependent Claim
9 words
The product produced by the method of claim 8.
Claim 25
Dependent Claim
9 words
The product produced by the method of claim 9.
Claim 26
Dependent Claim
9 words
The product produced by the method of claim 10.
Claim 27
Dependent Claim
9 words
The product produced by the method of claim 11.
Claim 28
Dependent Claim
9 words
The product produced by the method of claim 12.
Claim 29
Dependent Claim
9 words
The product produced by the method of claim 13.
Claim 30
Dependent Claim
9 words
The product produced by the method of claim 14.
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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |