US4052524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving adhesive bonding in steel/rubber composites and article
Assignee: Monsanto Co
•
Filing: 1975-08-15
•
Granted: 1977-10-04
•
Expires: 1995-08-15
Abstract
Abstract A method is disclosed for improving the hydrolytic stability of the adhesive bond between an RFL type organic adhesive and a steel reinforcing element in steel-rubber composite articles. This is achieved by a pre-treatment of the steel surface before it is coated with the organic adhesive. The pre-treatment includes first immersing the steel element in an aqueous bath containing an acid, or base followed by a water rinse. A primer coating is then applied onto the surface of the steel element which consists of an organo-silane compound of the following formula: X -- R.sup.1 -- Si -- (OR.sup.2).sub.3 where X is an amino, glycidoxy or an aminoethyl radical; and wherein R 1 is an alkylene radical of from 2 to 4 carbon atoms when X is amino or glycidoxy and --HN--R 3 --, where R 3 is an alkylene radical of from 2 to 3 carbon atoms when X is aminoethyl; and wherein R 2 is an alkyl of from 1 to 2 carbon atoms.
Inventors
- 👤 Nicholas K. Harakas
- 👤 Kent H. Fulton
- 👤 Paul A. Tierney
- 👤 Malcolm F. Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:25
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/04; C08J5/06; D; D07; D07B; D07B1/00; D07B1/06; D07B1/0606; D07B1/0666; C08J2321/00; D07B2205/00; D07B2205/20; D07B2401/00; D07B2401/20; D07B2401/202; D07B2401/2025; D07B2401/2095; D07B2501/00; D07B2501/20; D07B2501/2046; D07B2501/2076; Y; Y10; Y10S; Y10S156/00; Y10S156/91; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10819; Y10T152/10846; Y10T428/00; Y10T428/249921; Y10T428/249924; Y10T428/249933; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2942; Y10T428/2947; Y10T428/2962; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
221 words
A method for improving the hydrolytic stability of the adhesive bond between an RFL organic adhesive and a steel reinforcing element for rubber articles, said method comprising the following steps in sequence: a. immersing a steel or alloy steel reinforcing element in an aqueous bath which contains an inorganic acid having a pH in the range of from about 1 to 2.5 at make-up or a strong base having a pH in the range of from about 9 to 10.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; b. subjecting said element to a water rinse; c. coating the surface of the steel element with an organosilane compound of the formula X -- R.sup.1 -- Si -- (OR.sup.2).sub.3 where X is an amino, glycidoxy or an aminoethyl radical; and wherein R 1 is an alkylene radical of from 2 to 4 carbon atoms when X is amino or glycidoxy and --HN--R 3 --, where R 3 is an alkylene radical of from 2 to 3 carbon atoms when X is aminoethyl; and wherein R 2 is an alkyl of from 1 to 2 carbon atoms; d. dipping said element in an RFL organic adhesive; and e. curing said dipped element.
Claim 2
Independent Claim
221 words
A method for improving the hydrolytic stability of the adhesive bond between an RFL organic adhesive and a steel reinforcing element for rubber articles, said method comprising the following steps in sequence: a. immersing a steel or alloy steel reinforcing element in an aqueous bath which contains an inorganic acid having a pH in the range of from about 1 to 2.5 at make-up or a strong base having a pH in the range of from about 9 to 10.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; b. subjecting said element to a water rinse; c. coating the surface of the steel element with an organosilane compound of the formula X -- R.sup.1 -- Si -- (OR.sup.2).sub.3 where X is an amino, glycidoxy or an aminoethyl radical; and wherein R 1 is an alkylene radical of from 2 to 4 carbon atoms when X is amino or glycidoxy and --HN--R 3 --, where R 3 is an alkylene radical of from 2 to 3 carbon atoms when X is aminoethyl; and wherein R 2 is an alkyl of from 1 to 2 carbon atoms; d. dipping said element in an RFL organic adhesive; and e. curing said dipped element.
Claim 3
Dependent Claim
21 words
The method of claim 1, wherein said organosilane compound is selected from the group consisting of gamma-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and N-beta-aminoethyl gamma-aminopropyltrimethoxysilane.
Claim 4
Dependent Claim
22 words
A steel or alloy steel reinforcing element for rubber products which has been treated in accordance with the method of claim 1.
Claim 5
Dependent Claim
22 words
A pneumatic tire containing steel or alloy steel reinforcing elements which have been treated in accordance with the method of claim 1.
Claim 6
Dependent Claim
23 words
A steel or alloy steel reinforcing element having a ribbon configuration which has been treated in accordance with the method of claim 1.
Claim 7
Dependent Claim
26 words
A pneumatic tire containing steel or alloy steel reinforcing elements having a ribbon configuration which have been treated in accordance with the method of claim 1.
Claim 8
Independent Claim
266 words
A method for improving the hydrolytic stability of the adhesive bond between an RFL organic adhesive and a steel or alloy steel reinforcing element for rubber products, said method comprising the following steps in sequence: a. immersing a steel or alloy steel reinforcing element in an aqueous bath which contains a strong base having a pH ranging from about 9 to 10.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; b. rinsing the steel or steel alloy element with water; c. introducing said element into an aqueous bath containing an inorganic acid having a pH ranging from about 1 to 2.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; d. subjecting said element to a second water rinse; e. coating the surface of the steel or alloy steel element with an organosilane compound of the formula: X -- R.sup.1 -- Si (OR.sup.2).sub.3 where X is an amino, glycidoxy or an aminoethyl radical; and wherein R 1 is an alkylene radical of from 2 to 4 carbon atoms when X is amino or glycidoxy and --HN--R 3 --, where R 3 is an alkylene radical of from 2 to 3 carbon atoms when X is aminoethyl; and wherein R 2 is an alkyl of from 1 to 2 carbon atoms; f. dipping said element in an RFL organic adhesive; and g. curing said dipped element.
Claim 9
Independent Claim
266 words
A method for improving the hydrolytic stability of the adhesive bond between an RFL organic adhesive and a steel or alloy steel reinforcing element for rubber products, said method comprising the following steps in sequence: a. immersing a steel or alloy steel reinforcing element in an aqueous bath which contains a strong base having a pH ranging from about 9 to 10.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; b. rinsing the steel or steel alloy element with water; c. introducing said element into an aqueous bath containing an inorganic acid having a pH ranging from about 1 to 2.5 at make-up for a period of from 3 to 25 seconds with the bath being maintained at a temperature in the range of from 20° C. to 95° C.; d. subjecting said element to a second water rinse; e. coating the surface of the steel or alloy steel element with an organosilane compound of the formula: X -- R.sup.1 -- Si (OR.sup.2).sub.3 where X is an amino, glycidoxy or an aminoethyl radical; and wherein R 1 is an alkylene radical of from 2 to 4 carbon atoms when X is amino or glycidoxy and --HN--R 3 --, where R 3 is an alkylene radical of from 2 to 3 carbon atoms when X is aminoethyl; and wherein R 2 is an alkyl of from 1 to 2 carbon atoms; f. dipping said element in an RFL organic adhesive; and g. curing said dipped element.
Claim 10
Dependent Claim
23 words
A steel or alloy steel reinforcing element having a ribbon configuration which has been treated in accordance with the method of claim 7.
Claim 11
Dependent Claim
26 words
A pneumatic tire containing steel or alloy steel reinforcing elements having a ribbon configuration which have been treated in accordance with the method of claim 7.
References Cited (Backward Citations)
US3088847A
Cited
US3207623A
Cited
US3445326A
Cited
US3390714A
Cited
US3443620A
Cited
US3542639A
Cited
US3689300A
Cited
US3817778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |