DSM starts Purox Production at its new Plant in Rotterdam.

Revista de Plasticos Modernos: June 2002

DSM has tripled benzoic acid capacity and doubled sodium benzoate capacity by starting the production of these chemicals at its new facilities in Rotterdam, the Netherlands. DSM's benzoic acid is marketed under the Purox B trade name, and from Apr 2002 will be available with a guaranteed purity of 99.9%. DSM's sodium benzoate is supplied under the Purox S trade name, and its guaranteed purity is also 99.9%. Purox S is used as a preservative in food and drink products.

Acima receives Registration of Rocima 550.

Paint & Coatings Industry: June 2002

Acima has received registration from the EPA for the use of the new preservative Rocima 550 in waterborne coatings such as paints, slurries, dispersed pigments, adhesives and latex emulsions.

Thomas Swan Upgrades PCMX Plant.

European Chemicals News: June 2002

Thomas Swan of Consett, UK, has modernised its plant by improving its environmental management systems and optimising its process. The upgrade has reportedly made the firm a world leader in PCMX (Chloroxylenol BP), which is utilised in disinfectants, as well as fungal and mildew control. PCMX is utilised as an antiseptic base, as a preservative in toiletries and cosmetics, and other medical uses. The firm anticipates to formulate this and other products in the US industry.

Vanson & Halosource merge.

Modern Paint and Coatings: June 2002

Vanson Inc has completed a merger with HaloSource Corp that will combine the companies' scientific expertise and major functions via the new Vanson HaloSource. The new firm will manufacture products using chitin and chitosan technology from Vanson and antimicrobial technology from HaloSource. To serve clients better, Vanson HaloSource plans to capitalize on mutual manufacturing facilities and distribution channels for the water purification and clarification industries, as well as biomedical, nutritional supplements and cosmetics segments. Tapping new industries and broadening its reach in shared markets are also being planned by Vanson HaloSource, which uses chlorine to eradicate every known bacterium via its core N-halamine technology.

Dow Stands by its Biocides.

Specialty Chemicals Magazine: June 2002

Dow Biocides demonstrated its commitment to all 15 of its biocides by submitting for review inclusion in Annex 1 of the European Commission’s (EC) Biocidal Products Directive before 28th March 2002. According to Per Westin, this was a powerful statement of the Company’s intent. The following is a table of actives which will be supported:

Biocides submitted by Dow for inclusion in Annex 1 of BPD (tradenames)

DBNPA (anti-microbial 7287, Dowicil QK-20, Tablets)

O-phenylphenol (Dowicide 1)

7a-ethyldihydro-1 H,3H,5H-oxazolo[3,4-c]oxazole (Bioban CS-1246)

diiodomethyl-p-tolysulfone (Amical 48, Amical flowable)

2,6-dimethyl-m-dioxan-4-ol-acetate (Bioban DXN)

O-phenylphenol sodium salt (Dowicide A, Dowicide 25L)

1-(3-chloroally)-3,5,7-triazza-1-azoniaadamantane chloride (Dowicil 75)

1-(3-chloroally)-3,5,7-triazza-1-azoniaadamantane chloride (Dowicil 150)

2-bromo-2-nitropropane-1,3-diol (Bioban BP-M, Bioban BP-Plus, Bioban BP-40 or 30 or 10)

2-(hydroxymethyl)-2-nitro-1,3-propanediol (Tris Nitrol Solid & 50 %, Bioban CWT)

4,4-dimethyl-oxazolidine (Bioban CS-1135)

Ortho-phthaldehyde (Ucarcide P-200)

ß-bromo-ß-nitrostyrene (Bioban BNS 25 % BA, Bioban BNS, Canguard BNS)

4-(2-nitrobutyl)-morpholine (Bioban P-1487)

Glutaraldehyde (Ucarcide 250 & 224, Piror 850 & 824, Aqucar 550 & 524)


“There are quite a lot of active substances with niche applications where no registration was required until now. Beyond certain products in areas like cosmetics and personal care or medicine, where other directives cover them, the BPD is very comprehensive indeed and covers every application that we consider as a biocide. This will be a major challenge for small producers,” Westin says.

The company has also been getting ready for the EC’s Dangerous Preparation Directive, which is due to be implemented on 31 July. This states that all Xi, R43 biocide formulations, including those containing 15 parts per million (ppm) or more of CMIT mix (active biocide) should be classified and labelled as skin sensitizers. CMIT/MIT is the most widely used preservative in Europe and is very cost effective. Current effective use concentrations average between 25 and 50 ppm. The requirement means that formulators must either re-label their product lines or reformulate their products by reducing CMIT levels or replacing it.

Achieving either is a real challenge for formulators but Dow Biocides is responding by emphasizing the options afforded by its range of chemistries to meet the challenge. One such option is the use of Dowicil QK-20, a non oxidizing, broad spectrum antimicrobial. Dow claims that this can control bacteria, including Pseudomonas, fungi, yeast and biofilm, at low concentrations and typically yields a 99.9% microbial kill before it degrades. It is ideal when used as ‘knockdown’ biocide in wash waters, raw materials and finished products, the company adds.

Alternatively, Dowicil chemistry can be combined with the Bioban BP plus biocide or 100 ppm of Bioban BP plus preservative can be combined with 15 ppm of CMIT/MIT. Dow claims that this can give equal or better performance than systems using 25-50 ppm of CMIT/MIT alone, offering better performance against Pseudomonas and a reduced risk of bacterial tolerance or resistance.

For those seeking to replace CMIT/MIT, Dow is highlighting other options: Dowicil 75 broad spectrum antimicrobial bactericide that is used at 500-1,500 ppm in systems with pH levels of 4 to 8; Bioban DXN, a formaldehyde free, broad spectrum bactericide and fungicide that is used at 1,000-2,000 ppm in systems with pH levels of 4 to 8.5; and, Bioban CS-1246 for use in high pH systems, where BIT used as the sole preservative and/or where amines are present.

Dow Biocides is the result of three players coming together with their distinct product lines. Each individually was largely a niche player but together they make up a company which can claim to have one of the largest product lines in the field. Of the biocides listed, a few are unique to Dow, notably the Dowicil 75 and 150 brands of adamantine chlorides, the Tris Nitro brands based on 2-(hydroxymethyl)-2-nitro-1,3-propanediol and those based on B-bromo-B-nitrostyrene. The first of these compounds was Dow’s, the second was Angus and the third was Union Carbide.

Per Westin says “Union Carbide brought Dow Biocides a much stronger position in certain segments and greatly increased its global presence. Dow Biocides and Angus was mainly focused in North America, though Angus was also in Germany, whereas Union Carbide had a much stronger presence in Europe. One vital addition was the technical service centre at Meyrin, near Geneva, Switzerland where the company can now carry out services for its customers, such as preservative and compatibility testing and more generally offering solutions instead of just selling product.”

In products terms, the most important addition was glutaraldehyde. Union Carbide made these biocides under its Ucarcide, Piror and Aquacar brand names and marketed them mainly for applications in oilfield such as oil recovery, cooling water treatment, slime treatment in paper making and disinfectants for hospital and farm animals. The Ucarcide range of ortho-phthalaldehydes is also mainly used in disinfectants but may also have some potential process applications, Westin says.

Westin concludes: “It has become easier for us to tailor-make solutions because we have a wide variety of products working under different conditions. Meanwhile, the BPD will shrink the number of molecules being used and developed and will therefore open opportunities for some of the new products we develop to be used in certain market segments. One reason we are notifying the entire product line is that, by being able to support each one from a regulatory standpoint, we will be able to grow into new areas of the market”.