Fast drying biocidal preservative composition

Details Fast drying biocidal preservative composition Fast drying biocidal preservative composition

1999-12-16

2001-03-06

Green, Anthony (Department: 1755)

Compositions: coating or plastic

Coating or plastic compositions

Contains fireproofing or biocidal agent

C106S018330, C106S018340, C252S008570, C514S341000, C514S343000, C514S634000

Reexamination Certificate

active

06197098

ABSTRACT:

BACKGROUND OF THE INVENTION
In one aspect the invention relates to concentrate compositions for non-specific, i.e. gram-negative and gram positive, fungicides and insecticides. In another aspect the invention is directed to fast drying, deeply penetrating, diluted concentrate compositions useful in the preservation of wood and leather goods.
Current wood and leather preservatives containing water insoluble active agents generally employ inexpensive solvents or diluents such as white spirit, petroleum naphtha and the like, having high aromatic content. However, these compositions do not have good penetrating properties and are relatively slow drying. Further, these compositions tend to be physically unstable and separate into two phases resulting in undesirable residues and darkened coating of the substrate. It has also been reported that the current preservatives do not achieve uniform distribution of the active component due to phase separation so that accurate concentrations and dosages are difficult to administer.
Accordingly, it is a purpose of this invention to overcome the above shortcomings by providing commercially feasible and economical, homogeneous biocidal compositions suitable for the preservation of wood, leather and other articles of manufacture.
SUMMARY OF THE INVENTION
In accordance with this invention there is provided a biocidal concentrate comprising:
(a) between about 0.5 to about 7 wt. % of an active biocidal nitrogen-containing and/or sulfur-containing component and
(b) between about 20 and about 55 wt. % of a component selected from the group consisting essentially of (i) butyrolactone containing 0 to about 85 wt. % N-methyl pyrrolidone and/or 0 to about 80 wt. % of a C
2
to C
4
aliphatic alcohol and (ii) about a 10/90 to 60/40 mixture of N-methyl pyrrolidone/C
2
to C
4
aliphatic alcohol.
Although the above concentrate can be directly incorporated inweto a commercial matrix or premixed formulation, it is generally desirable to dilute the concentrate by between about 0.5 and about 80 volumes, preferably 10 to 60 volumes, with a diluent comprising a petroleum distillate boiling above 40° C., a C
2
to C
4
alcohol or a mixture thereof to provide a composition having an active content of from about 2 ppm to about 5% and a total C
2
to C
4
aliphatic alcohol content of between about 20 and about 90 wt. %. This composition is then applied directly to the substrate or may be combined with conventional preservative excipients and coated or sprayed on the substrate.
DETAILED DESCRIPTION OF THE INVENTION
The active component in the above concentrate is a conventional water insoluble, fungicidal or insecticidal nitrogen- and/or sulfur-containing compound. Representative examples of these include imide, amide, amine, azo, thio, imidiazole and halogenated compounds of which [1-(6-chloro-3-pyridylmethyl-N-nitroimidazolidin-2-ylideneamine] (Imidacloprid); [N,N-(1,4-piperazine diyl formamide] (Triforine); guanidine; dodecyl guanidine acetate (Dodine acetate); iminoctadine; nicotine and salicylate, sulfate, tartrate, and fluoro and chloro salts thereof; 5-ethoxy-3-trichloromethyl-1,2,4-thiadiazole (Etridiazol); 2-(4-thiazonyl) benzimidazole (Thiabendazole), 1-(2-[2,4-dichlorophenyl]-4-propyl-1,3-dioxolan-2-ylmethyl)-1H-1,2,4-triazole (Propiconazole); O,O-diethyl-O-quinoxalin-2-yl phosphorothioate (Quinalphos); N-(trichlorpmethylthio)-4-cyclohexene-1.2-dicarboximide (Captan); N-(trichloromethylthio) phthalimide (Folpet) and (RS)-2,4-difluoro-&agr;-(1H-1,2,4-triazol-1-yl methyl) benzhydryl alcohol (Flutriafol) are examples. Generally the conventional dosages of these biocides are recommended for the diluted compositions of this invention.
Although methanol, ethanol, n-propanol, isopropanol, n-, iso- or tert-butanol or a combination of these can be used in the above concentrate or diluent composition, isopropanol is preferred to further enhance uniform active distribution and fast drying properties. The weight ratio of active component to C
2
to C
4
alcohol in the final composition is generally between about 1:70 and about 1:5,000 depending on the toxicity and efficacy of the biocidally active compound.
In the above concentrate, butyrolactone, when used alone or in combination with N-methyl pyrrolidone, provides better distribution of the active component on the site of application than N-methyl pyrrolidone alone and therefor, at least 0.5 wt. % of the lactone is preferred in the concentrate solution. The N-methyl pyrrolidone in the concentrate may be augmented with a higher alkyl pyrrolidone such as a C
8
to C
12
alkyl pyrrolidone, preferably N-octyl pyrrolidone, to provide enhanced spreadability and substrate penetration. However, the concentration of the higher alkyl pyrrolidone with respect to N-methyl pyrrolidone should not exceed 10 wt. %.
Petroleum diluents such as white spirit, petroleum ether or other petroleum distillates boiling above 40° C., preferably above 60° C., are employed from a cost consideration; however, at least a 20 wt. % concentration of C
2
to C
4
alcohol in the overall final composition is needed to prevent phase separation. Additionally, the combination of such distillates with the C
2
to C
4
alcohol greatly improves the penetration of the preservative into the pores of the substrate thus extending the degree of protection while providing more uniform distribution of the active component in the resulting homogeneous composition. Thus, accurate dosages of the biocide can be predetermined and administered. The presence of the alcohol reduces undesirable residue in and on the substrate in proportion to its concentration. Other benefits, such as reduced toxicity resulting from extended human exposure and extension of storage capability for the diluted concentrate, are also realized by the use of the present composition. Finally, it is discovered that the use of isopropyl alcohol permits at least 50% increase in loading of the active component as compared to a composition employing petroleum diluent alone.
The preferred composition applied in effective amount to the wood or leather substrate of this invention comprises:
A. between about 10 and about 50 wt. % of a concentrate comprising a petroleum distillate boiling above 40° C. and containing
(a) between about 0.5 and about 7 wt. % of an active nitrogen- or sulfur-containing biocide and
(b) between about 20 and about 55 wt. % of a solvent for said active biocide selected from the group consisting of
(i) butyrolactone containing 0 to 85 wt. % N-methyl pyrrolidone and/or 0 to 85 wt. % of a C
2
to C
4
aliphatic alcohol and
(ii) N-methyl pyrrolidone containing 0 to 85 wt. % of a C
2
to C
4
alcohol and
B. from about 90 to about 50 wt. % of a C
2
to C
4
aliphatic alcohol containing 0 to 85 wt. % of mineral spirit as a diluent to provide a sprayable composition.
Having generally described the invention, reference is now had to the accompanying examples which are provided to illustrate preferred and comparative embodiments concerning the invention. However, these examples are not to be construed as limiting to the scope of the invention as more broadly defined in the appended claims.


REFERENCES:
patent: 5071463 (1991-12-01), Narayanan et al.
patent: 5262414 (1993-11-01), Albert et al.
patent: 351 195 (1990-01-01), None
patent: 2 118 160 (1983-10-01), None
patent: 351 195 (1997-01-01), None
patent: 99/55505 (1999-11-01), None

Affiliated with

Also associated with

Rating

Fast drying biocidal preservative composition does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Fast drying biocidal preservative composition, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fast drying biocidal preservative composition will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2438702