US4104249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hexahydropyrimidines as anti-oxidants in natural and synthetic rubbers
Assignee: Baker Petrolite LLC
•
Filing: 1976-06-01
•
Granted: 1978-08-01
•
Expires: 1996-06-01
Abstract
Abstract This invention relates to the use of hexahydropyrimidines (HHP) as anti-oxidants for elastic materials such as rubber. The preferred hexahydropyrimidines contain at least one cycloalkylene or substituted cycloalkylene group and most preferably three cycloalkylene groups as illustrated by 2,2,4,4-dipentamethylene-5,6-tetramethylene hexahydropyrimidine.
Inventors
- 👤 Bernardus A. Oude Alink
- 👤 Neil E. S. Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:57
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C07; C07D; C07D239/00; C07D239/70; C08K5/3465; Y; Y10; Y10S; Y10S524/00; Y10S524/925; Y10S524/929
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
68 words
A rubber composition containing an antioxidant amount of a hexahydropyrimidine of the formula ##STR18## where the R's are hydrogen, alkyl, aryl, cycloalkyl, aralkyl, alkaryl or heterocyclic, and where R 1 and R 2 may be joined to form a cycloalkyl group, R 3 and R 4 may be joined to form a cycloalkyl group and R 5 and R 6 may be joined to form a cycloalkyl group.
Claim 2
Dependent Claim
68 words
A rubber composition containing an antioxidant amount of a hexahydropyrimidine of the formula ##STR18## where the R's are hydrogen, alkyl, aryl, cycloalkyl, aralkyl, alkaryl or heterocyclic, and where R 1 and R 2 may be joined to form a cycloalkyl group, R 3 and R 4 may be joined to form a cycloalkyl group and R 5 and R 6 may be joined to form a cycloalkyl group.
Claim 3
Dependent Claim
14 words
The composition of claim 1 where the hexahydropyrimidine contains at least 1 cycloalkylene group.
Claim 4
Dependent Claim
14 words
The composition of claim 2 where the cycloalkylene group of the hexahydropyrimidine is cyclohexyl.
Claim 5
Dependent Claim
12 words
The composition of claim 3 where the hexahydropyrimidine contains three cyclohexyl groups.
Claim 6
Dependent Claim
24 words
The composition of claim 2 where the hexahydropyrimidine has the formula ##STR19## where the R's are hydrogen, alkyl, aryl, cycloalkyl, alkaryl, aralkyl, or heterocyclic.
Claim 7
Dependent Claim
24 words
The composition of claim 5 where the hexahydropyrimidine has the formula ##STR20## where the R's are hydrogen, alkyl, aryl, cycloalkyl, alkaryl, aralkyl, or heterocyclic.
Claim 8
Dependent Claim
19 words
The composition of claim 4 where the hexahydropyrimidine has the formula ##STR21## where the R's are hydrogen or alkyl.
Claim 9
Dependent Claim
11 words
The composition of claim 7 where the hexahydropyrimidine is 2,2,4,4-dipentamethylene-5,6-tetramethylene hexahydropyrimidine.
Claim 10
Dependent Claim
8 words
The composition of claim 7 which is non-staining.
Claim 11
Dependent Claim
8 words
The composition of claim 8 which is non-staining.
Claim 12
Dependent Claim
11 words
The composition of claim 1 where the rubber is natural rubber.
Claim 13
Dependent Claim
13 words
The composition of claim 1 where the rubber is a polymer of butadiene.
Claim 14
Dependent Claim
15 words
The composition of claim 1 where the rubber is a copolymer of butadiene and styrene.
Claim 15
Dependent Claim
15 words
The composition of claim 8 where the rubber is a copolymer of butadiene and styrene.
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) | 1981-07-31 | 1982-01-30 | 1982-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-07-31 | 1986-01-30 | 1986-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-07-31 | 1990-01-30 | 1990-08-01 | $7700.00 | Window Closed / Lapsed |