Patent US3907925A successfully refreshed from Google Patents.
US3907925A
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US
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Metal deactivators as adhesion promotors for vulcanizable elastomers to metals
Assignee: Novartis Corp
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Filing: 1973-10-10
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Granted: 1975-09-23
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Expires: 1993-10-10
Abstract
Abstract Adhesion of metals to vulcanizable elastomers is promoted by a process of incorporating into the elastomer a metal deactivator and then vulcanizing the elastomeric composition while it is in contact with the metal surface.
Inventors
- 👤 George K Cowell
- 👤 David J Cherry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:05
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/37; C08K5/372; C08K5/3725; C08K5/16; C08K5/22; C08K5/24; C08K5/29; C08K5/30; C08K5/34; C08K5/3467; C08K5/3477; C08K5/3492; C08K5/38; Y; Y10; Y10S; Y10S156/00; Y10S156/91
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A METHOD OF IMPROVING ADHESION BETWEEN A VULCANIZABLE ELASTOMERIC COMPOSITION AND A METAL SURFACE TO PROVIDE A STRONG AND DURABLE BOND, WHICH METHOD COMPRISES A. ADDING TO A VULCANIZABLE ELASTOMERIC COMPOSITION FROM 0.05 PHR TO 10 BY WEIGHT BASED ON THE WEIGHT OF THE ELASTOMER OF AN ORGANIC HYDROZINE DERIVATIVE WITH METAL DEACTING EFFICIENCY, AND B. VULCANIZING THE COMPOSITION WHILE IT IS IN CONDUCT WITH THE METAL SURFACE.
Claim 2
Independent Claim
68 words
A METHOD OF IMPROVING ADHESION BETWEEN A VULCANIZABLE ELASTOMERIC COMPOSITION AND A METAL SURFACE TO PROVIDE A STRONG AND DURABLE BOND, WHICH METHOD COMPRISES A. ADDING TO A VULCANIZABLE ELASTOMERIC COMPOSITION FROM 0.05 PHR TO 10 BY WEIGHT BASED ON THE WEIGHT OF THE ELASTOMER OF AN ORGANIC HYDROZINE DERIVATIVE WITH METAL DEACTING EFFICIENCY, AND B. VULCANIZING THE COMPOSITION WHILE IT IS IN CONDUCT WITH THE METAL SURFACE.
Claim 3
Dependent Claim
26 words
The method of claim 1 wherein the vulcanizable elastomer is selected from natural rubber, styrene-butadiene copolymer, ethylene-propylene terpolymer or butyl rubber containing at least 0.8% unsaturation.
Claim 4
Dependent Claim
30 words
The method of claim 1 wherein the organic hydrazine derivative is present in an amount of from 0.1 to 5.0 phr by weight, based on the weight of the elastomer.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the elastomeric composition contains carbon black.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein the vulcanizing agent is sulfur.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the vulcanizable elastomer is natural rubber and the organic hydrazine derivative has the formula
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the organic hydrazine derivative is oxalo-bis-(2-hydroxy-benzylidene-hydrazide).
References Cited (Backward Citations)
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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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |