Patent US3874869A successfully refreshed from Google Patents.
US3874869A
Expired / Lapsed
US
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Antimicrobial agents for water conservation
Assignee: Hendel & Cie GmbH
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Filing: 1973-04-20
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Granted: 1975-04-01
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Expires: 1993-04-20
Abstract
Abstract A process for the prevention of the growth of microorganisms, especially in industrial water, comprises contacting these microorganisms with an effective antimicrobial amount of a reaction product of Epsilon -caprolactam and an N-alkylalkylene diamine with the reaction being carried out in the liquid phase for 3 to 20 hours at a temperature above 180*C. The process further comprises incorporating into said industrial water an effective amount of a sequestering agent comprising a watersoluble phosphonic acid which forms a complex with a divalent metal, a water-soluble salt of the acid and the mixtures thereof, with the weight ratio of sequestering agent to reaction product being 1:10 to 10:1.
Inventors
- 👤 Gunter Koppensteiner
- 👤 Hans-Werner Eckert
- 👤 Volker Wehle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:00
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/50
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
44 words
A PROCESS FOR THE PREVENTION OF THE GROWTH OF MICROORGANISMS IN AN AQUEOUS ENVIRONMENT WHICH CONSISTS ESSENTIALLY OF CONTACTING SAID MICROORGANISMS WITH AN AMOUNT EFFECTIVE TO PREVENT THE GROWTH OF SAID MICROORGANISMS OF A REACTION PRODUCT OF E-CAPROLACTAM WITH AN N-ALKYLALKYLENEDIAMINE OF THE FORMULA
Claim 2
Dependent Claim
44 words
A PROCESS FOR THE PREVENTION OF THE GROWTH OF MICROORGANISMS IN AN AQUEOUS ENVIRONMENT WHICH CONSISTS ESSENTIALLY OF CONTACTING SAID MICROORGANISMS WITH AN AMOUNT EFFECTIVE TO PREVENT THE GROWTH OF SAID MICROORGANISMS OF A REACTION PRODUCT OF E-CAPROLACTAM WITH AN N-ALKYLALKYLENEDIAMINE OF THE FORMULA
Claim 3
Dependent Claim
31 words
The process of claim 1 in which said amount effective to prevent the growth of said microorganisms is from 0.1 to 500 parts per million by weight of said reaction product.
Claim 4
Dependent Claim
11 words
The process of claim 1 in which said microorganism is algae.
Claim 5
Dependent Claim
38 words
A process for the prevention of the growth of microorganisms in industrial water which comprises incorporating into said industrial water an antimicrobial effective amount of a reaction product of epsilon -caprolactam with an N-alkylalkylene diamine of the formula
Claim 6
Dependent Claim
38 words
A process for the prevention of the growth of microorganisms in industrial water which comprises incorporating into said industrial water an antimicrobial effective amount of a reaction product of epsilon -caprolactam with an N-alkylalkylene diamine of the formula
Claim 7
Dependent Claim
21 words
The process of claim 4 in which said antimicrobial effective amount of said reaction product is from 0.5 to 50 mgm/liter.
Claim 8
Dependent Claim
21 words
The process of claim 4 in which said antimicrobial effective amount of said reaction product is from 1 to 10 mgm/liter.
Claim 9
Dependent Claim
35 words
The process of claim 4 in which R is alkyl of 12 to 14 carbon atoms, R1 is hydrogen, and with the molar ratio of N-alkylalkylene diamine to epsilon -caprolactam ranging from 1:1 to 1:5.
Claim 10
Dependent Claim
25 words
The process of claim 7 in which n is 3, with the molar ratio of N-alkylalkylene diamine to epsilon -caprolactam ranging from 1:1 to 1:3.
Claim 11
Dependent Claim
23 words
The process of claim 8 in which said reaction product consists of dodecyl-1,3-propylene diamine and epsilon -caprolactam in the molar ratio of 1:1.
Claim 12
Dependent Claim
23 words
The process of claim 8 in which said reaction product consists of dodecyl-1,3-propylene diamine and epsilon -caprolactam in the molar ratio of 1:3.
Claim 13
Dependent Claim
25 words
The process of claim 8 in which said reaction product consists of coconut fatty alkyl-1,3-propylene diamine and epsilon -caprolactam in the molar ratio of 1:3.
Claim 14
Dependent Claim
23 words
The process of claim 8 in which said reaction product consists of tetradecyl-1,3-propylene diamine and epsilon -caprolactam in the molar ratio of 1:3.
Claim 15
Dependent Claim
38 words
The process of claim 8 in which said reaction product consists exclusively of the reaction product of epsilon -caprolactam with N-alkylalkylene diamine, and said reaction is carried out at a temperature of about 250*C in the liquid phase.
Claim 16
Dependent Claim
11 words
The process of claim 4 in which said microorganism is algae.
Claim 17
Dependent Claim
53 words
The process of claim 4 in which R1 is hydrogen, n is 3, and R is selected from the group consisting of decyl, dodecyl, coconut fatty alkyl, tetradecyl, hexadecyl, tallow fatty alkyl, hardened tallow fatty alkyl and octadecyl, with the molar ratio of N-alkylalkylene diamine to epsilon -caprolactam ranging from 1:1 to 1:5.
Claim 18
Dependent Claim
19 words
The process of claim 4, in which R1 is hydrogen, n is 2, and R is coconut fatty alkyl.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |