GB2118160A - Methylene bisthiocyanate compositions - Google Patents
Methylene bisthiocyanate compositions Download PDFInfo
- Publication number
- GB2118160A GB2118160A GB08306926A GB8306926A GB2118160A GB 2118160 A GB2118160 A GB 2118160A GB 08306926 A GB08306926 A GB 08306926A GB 8306926 A GB8306926 A GB 8306926A GB 2118160 A GB2118160 A GB 2118160A
- Authority
- GB
- United Kingdom
- Prior art keywords
- compositions
- methylene bisthiocyanate
- methylene
- bisthiocyanate
- composition according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
- A01N47/40—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having a double or triple bond to nitrogen, e.g. cyanates, cyanamides
- A01N47/48—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having a double or triple bond to nitrogen, e.g. cyanates, cyanamides containing —S—C≡N groups
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Pest Control & Pesticides (AREA)
- Plant Pathology (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Agronomy & Crop Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Dentistry (AREA)
- General Health & Medical Sciences (AREA)
- Wood Science & Technology (AREA)
- Zoology (AREA)
- Environmental Sciences (AREA)
- Agricultural Chemicals And Associated Chemicals (AREA)
Abstract
A composition which may be used as a biocide comprises methylene bisthiocyanate dissolved in N-methyl pyrrolidone.
Description
SPECIFICATION
Methylene bisthiocyanate compositions
Methylene bisthiocyanate is a well known biocide. Biocidal compositions containing it and uses of these are described for instance US
Patent Specifications Nos. 3,252,855, 3,300,375 and 3,306,810. Various methods of making methylene bisthiocyanate are known and a suitable method is described in US Patent
Specification No. 3,524,871.
Methylene bisthiocyanate is a solid having a rather low solubility in water (about 0.5%). We are particularly concerned with its biocidal use in aqueous systems and for these it is essential to be able to distribute it in the aqueous system very rapidly. It can be supplied as an aqueous dispersion but it is preferred for most purposes to provide it in the form of a water dispersable solution in an organic solvent.
A large number of solvents have been proposed for use in the synthesis or purification of methylene bisthiocyanate and for use in the formulation of biocidal compositions. For instance numerous solvents are described in US Patent
Specification No. 3,524,871.
In practice however biocidal compositions are generally in the form of solutions in alcohols (see for instance US Patent Specification No.
3,300,375) or am ides (see for instance US Patent
Specification No. 3,306,810). In particular, the solvents commonly used at present are primarily isopropanol and/or dimethyl formamide. These solvents are inherently hazardous since they have low flash points and are toxic. In particular compositions based on them are not entirely stable. Thus we sometimes find decomposition of methylene bisthiocyanate in such solutions. This decomposition liberates a gas and sealed containers of such compositions have sometimes had to be withdrawn for safety reasons, due to build up of pressure in the container on storage.
Many attempts have been made to find more stable and safer compositions but so far none of these have succeeded, and isopropanol and dimethyl formamide remain as the normal solvents, despite the associated hazard, toxicity and instability of the compositions.
We have now surprisingly found that one organic solvent, not previously mentioned as a solvent for methylene bisthiocyanate, is capable of giving greatly improved compositions.
A composition according to the invention comprises a solution of methylene bisthiocyanate in N-methyl pyrollidone.
The concentration of methylene bisthiocyanate may range from very low values, e.g. 0.1%, up to saturation values. The maximum solubility is normally around 30%, and so this is normally the maximum concentration. These percentages are by weight based on the total weight of methylene bisthiocyanate and N-methylene pyrollidone.
Suitable compositions generally contain at least 5%, and often at least 10% methylene bisthiocyanate. Often the concentration is not more than 25%.
The composition may include other additives, such as those conventionally included in methylene bisthiocyanate compositions. Suitable additives include dispersants or emulsifiers.
The composition can very easily be made simply by mixing powdered methylene bisthiocyanate with the appropriate amount of Nmethyl pyrollidone until solution is achieved. Any desired additives may be added before, during or after the mixing. The resultant composition may then be stored in sealed containers for subsequent use as a biocide in aqueous or other systems, in known manner.
The compositions have the advantage that, compared to the known compositions based on dimethyl formamide or isopropanol, they have a lower toxicity and higher flash point and are less hazardous, and the methylene bisthiocyanate is less susceptible to decomposition.
Claims (5)
1. A composition comprising a solution of methylene bisthiocyanate in N-methyl pyrollidone.
2. A composition according to claim 1 in which the concentration of methylene bisthiocyanate, based on the total weight of methylene bisthiocyanate and N-methyl pyrollidone, is 5 to 30%.
3. A composition according to claim 2 in which the concentration is 10 to 25%.
4. A composition according to any preceding claim also including dispersant or emulsifier.
5. A sealed container containing a composition according to any preceding claim.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08306926A GB2118160B (en) | 1982-03-19 | 1983-03-14 | Methylene bisthiocyanate compositions |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8208163 | 1982-03-19 | ||
| GB08306926A GB2118160B (en) | 1982-03-19 | 1983-03-14 | Methylene bisthiocyanate compositions |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8306926D0 GB8306926D0 (en) | 1983-04-20 |
| GB2118160A true GB2118160A (en) | 1983-10-26 |
| GB2118160B GB2118160B (en) | 1985-01-09 |
Family
ID=26282313
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08306926A Expired GB2118160B (en) | 1982-03-19 | 1983-03-14 | Methylene bisthiocyanate compositions |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2118160B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5227509A (en) * | 1990-05-07 | 1993-07-13 | Isp Investments Inc. | Process for manufacture of organic esters of strong acids |
| WO1999055505A1 (en) * | 1998-04-29 | 1999-11-04 | New Zealand Forest Research Institute Limited | Diffusable antisapstain method and compositions |
| US6197098B1 (en) * | 1999-12-16 | 2001-03-06 | Isp Investments Inc. | Fast drying biocidal preservative composition |
| CN102613232A (en) * | 2012-03-05 | 2012-08-01 | 天津开广工业水处理有限公司 | Slow-release solid bactericide |
-
1983
- 1983-03-14 GB GB08306926A patent/GB2118160B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5227509A (en) * | 1990-05-07 | 1993-07-13 | Isp Investments Inc. | Process for manufacture of organic esters of strong acids |
| WO1999055505A1 (en) * | 1998-04-29 | 1999-11-04 | New Zealand Forest Research Institute Limited | Diffusable antisapstain method and compositions |
| US6197098B1 (en) * | 1999-12-16 | 2001-03-06 | Isp Investments Inc. | Fast drying biocidal preservative composition |
| CN102613232A (en) * | 2012-03-05 | 2012-08-01 | 天津开广工业水处理有限公司 | Slow-release solid bactericide |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8306926D0 (en) | 1983-04-20 |
| GB2118160B (en) | 1985-01-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |