FR2843853A1 - Fungicidal composition useful for treatment of paper or cardboard packaging for long term protection against mildew, comprising methyl thiophanate - Google Patents

Abstract

Fungicidal composition comprises methyl thiophanate (TPM). An Independent claim is also included for the process of protection of paper, water-based paints or glues against development of mildew and mould.

Description

The present invention relates to fungicidal compositions which

  protect paper, base paints over a long period of time

  aqueous or glues or the like with regard to the development of molds.

  The present invention relates in particular to fungicides of this kind in the field of packaging of soaps or food products in particular relates to the protection of paper or cardboard packaging or

  paper or cardboard labels for such products.

  The present invention also relates to packaging sheets coated with a fungicidal composition allowing protection over a long period of time of the packaged product against the development of molds. A well-known fungicide, in particular in the field of packaging of soaps, is di-iodomethyl -P-tolyl sulfone also known under the name of "Friendly" (registered trademark) and which will not be designated DIMPTS 15 by after. This DIMPTS compound is an excellent fungicide to be applied to packaging, in particular soap packaging, and it fights perfectly over the long term mold that can form on these paper packaging or

  cardboard. However, this product has the disadvantage of being very expensive.

  The present invention relates to a new fungicide composition for paper or cardboard packaging which gives good results, and in particular as good as those which can be obtained with pure DIMPTS, all

  by being however much less expensive to manufacture.

  According to the present invention, the fungicidal composition for

  paper or cardboard packaging sheets contain thiophanatemethyl.

  Thiophanate-methyl is much less costly, for example than DIMPTS, and yet is as suitable as this for combating mold. According to another aspect of the invention, the latter also relates to a new fungicide composition which gives results that are as good or even better than what can be obtained with pure DIMPTS and which is however also less expensive to manufacture than fungicide based on

DIMPTS pure.

  According to the second aspect of the present invention, the fungicidal composition comprises a mixture of thiophanate-methyl and DIMPTS, the proportions by weight in the mixture preferably being between 40/60

  and 80/20 (thiophanate methyl / DIMPTS).

  According to yet another aspect of the present invention, the latter relates to a packaging sheet of paper or cardboard, in particular for soap or food products, to which is applied on the surface a

composition according to the invention.

  As we will see in the tests provided later in this

  description, TPM or thiophanate-methyl and DIMPTS have substantially identical fungicidal actions on paper packaging. However, 5 on the one hand, thiophanate-methyl is much less expensive than DIMPTS.

  On the other hand, it turns out that the TPM / DIMPTS mixture has better fungicidal activity than for paper or cardboard packaging products than

  that of DIMPTS alone or TPM alone.

  The present invention also relates to a suspension comprising 10 between 30 and 50% of the fungicidal composition according to the invention.

  According to a preferred embodiment of the invention, the particle size of the mixture in suspension in a solvent, and in particular in water is between 1 and 50 μm, preferably is less than 25 μm and even more

  preferably is less than 5 pm being between 1 and 5 pm.

  To prepare an example of a fungicide according to the invention, it is possible to mix in a solvent, for example water or the like, diiodomethyl -p-tholyl-sulfone (DIMPTS) and thiophanate-methyl in an amount of 70% by weight of thiophanate-methyl and 30% by weight of DIMPS, the composition of the aqueous suspension being such that it contains 40% of active material. This mixture is then applied to paper or cardboard packaging faces for food products or soap. Several ways to perform

application are possible.

  The first possibility is to put the aqueous suspension in a sauce (5 to 10% of starch in water and 2 to 10% of fungicide) and to apply this sauce in a size press on one of the sides of the sheet. 'packaging. The second possibility is to add product between 2 and

  % in a coating sauce which is normally a latex of SPR or acrylic type and which may also contain pigments (calcium carbonate or 30 Carolin) and then applying this product to the cardboard surface in a coater.

  Finally, another possibility, without being limited to

  possibilities described, consists in applying the mixture on paper or cardboard mixed with a varnish and in carrying out the application in a printing press.

  The recommended dosage range is between 750 PPM and 2000 PPM 35 of active ingredient in paper.

  The present invention also relates to a method of protecting a soap or food product packaging sheet against mold, characterized in that it comprises the steps which consist in: - taking a suspension according to invention, 10 - put the suspension in a sauce, comprising from 2 to 10% of the fungicidal composition according to the invention, and optionally from 5 to 20% of starch in water, and apply the coating sauce in a press glue on

one side of the sheet.

  The present invention also relates to a method of protecting a soap or food product packaging sheet against mold, characterized in that it comprises the steps which consist in: - taking a suspension according to invention, - put the suspension in a coating sauce, in particular a latex of type SBR or acrylic and possibly pigments, in an amount of 2 to 10% by weight, and apply the sauce on the surface of the sheet in a coater .

  The following tests have been performed.

TEST I

  Assay of Thiophanate-methyl and Di-iodomethyl-P-Tolyl: The assay was carried out by liquid chromatography according to an "INTACECTP" procedure. 25 The samples are indicated in the table below Thiophanate DIMPTS Active material N / Ref V / Ref methyl (mg / kg) total (mg / kg) in mg / kg Papers n E 32123.06 B 850 1,000 ppm 890 890 E 32123.04 B 850 1,600 ppm I 545 1,545 E 32123.07 B 7,585 1,000 ppm 365 350 715 E 32123.05 B 7585 1 600 ppm 650 555 1 205

FUNGAL RESISTANCE TEST

  The two sides of the paper are brought into contact with ten strains of fungi for 14 days, under the conditions of the qualitative test of the

AFNOR X 41 517 standard.

  At the end of this period, the visual appreciation of the development of

  mold was transcribed using a code from 0 to 6+; the value 6+ was assigned to the control without treatment, while the rating 0 corresponds to no development of the seeded molds.

RESULTS

  We did not observe any fungal development

  (0+ rating) for B 850, 1000 ppm and B 7585, 1000 ppm.

TEST II

FUNGAL RESISTANCE TEST

  The two sides of the paper are brought into contact with three strains of fungi for 14 days under the conditions of the qualitative test of the TAPP'PI standard T 487 pm 85. 20 At the end of this period, the visual appreciation of the development of the mold was transcribed using a code from 0 to 6+; the value 6+ was assigned to the witness without treatment, while the rating 0 corresponds to none

  development of seeded molds.

RESULTS

  We did not observe any fungal development (0+ rating) for B 850, 1000 ppm and B 7585, 1000 ppm. 30

TEST III

FUNGAL RESISTANCE TEST

  The two sides of the paper are put in contact with four strains of fungi for 14 days, under the conditions of the method

"UNILEVER".

  The strains used are: Carbendazim Sensitive aspergillus, Carbendazim Resistant aspergillus Carbendazim Sensitive penicillium Carbendazim Resistant penicillium

  The medium used is sabourauds dextrose agar.

  At the end of this period, the visual appreciation of the development of

  mold was transcribed using a code from 0 to 50; the value 50 was assigned to the control without treatment, while the rating 0 corresponds to no 10 development of the seeded molds.

RESULTS

  Developmental assessment: - Sample N B 850 1,600 ppm has a rating of 10 for Carbendazim Sensitive penicillium and a rating of 50 for the other three strains. - The sample N B 7585 1600 ppm has a 20

  rating 10 for Carbendazim Sensitive aspergillus and rating 0 for the other three strains.

TEST IV

  Assay of Di-iodomethyl-P-Tolylsulfone: The assay was carried out by liquid chromatography after 30 minutes of ultrasonic extraction according to an "INTACE-CTP" procedure.

RESULTS

DIMPTS

  O / Ref. V / Ref (mg / kg) E32172.05 Paper B 740 at 1600 ppm 2000

FUNGAL RESISTANCE TEST

  The two sides of the paper are brought into contact with four strains of fungi for 14 days, under the conditions of

"UNILEVER" method.

  The strains used are: Aspergillus Carbendazim sensitive, 5 Aspergillus Carbendazim resistant,

  Penicillium Carbendazim sensitive, Penicillium Carbendazim resistant.

  The medium used is dextrose agar sabourauds.

  At the end of this period, the visual assessment of the development of molds was transcribed using a code from 0 to 50; the value 50 was assigned to the witness without treatment, while the notation 0 corresponds to no

  development of seeded molds.

RESULTS

Development appreciation:

  - The sample "Support Witness" (E32172.04) has a notation 50 for the four strains.

  - The sample "B 740 - 1600 ppm" (E32172.05) 25 has a notation 10 for Aspergillus Carbendazim sensitive (at the corners of the sample); 0 for Aspergillus Carbendazim resistant, 0 for Penicillium Carbendazim sensitive and 0 for Penicillium Carbendazim resistant.

30 Consequently, the methyl thiophanate-DIMPTS mixture presents results as good as DIMPTS alone, or even better since in test IV the concentration of active material is greater (2,000 ppm) than that in test III (1,205 ppm ) for mixing. 35

Claims (8)

  1. Fungicidal composition for paper or cardboard packaging sheets, characterized in that it contains methyl thiophanate. 2. fungicidal composition according to claim 1, characterized in that it comprises from 40 to 80% by weight of methyl thiophanate and from 60 to 20 % by weight of DIMPTS.   3. Soap or food product packaging sheet, the sheet 10 being made of paper or cardboard, to which is applied a surface   Fungicidal composition according to either of Claims 1 or 2.   4. Suspension comprising between 30 and 50% of a composition   fungicide according to claim 1 or 2, and a solvent, in particular water.   5. Suspension according to claim 4, characterized in that the particle size of the suspension mixture is between 1 and 50 μm,   preferably <25 pm, more preferably less than 5 pm.   6. A method of protecting a soap or food product packaging sheet against mold, characterized in that it comprises the steps which consist in: - taking a suspension according to claim 4 or 5, put the suspension in a sauce comprising from 2 to 10% of the fungicidal composition according to claim 1 or 2, and optionally from 5 to 20% of starch in water, and   - apply the coating sauce in a size press on one side of the sheet.   7. A method of protecting a soap or food product packaging sheet against mold, characterized in that it comprises the steps which consist in: - taking a suspension according to claim 4 or 5, put the suspension in a coating sauce, in particular a latex of the SBR or acrylic type and optionally pigments, in an amount of 2 to 10% by weight, and   - apply the sauce on the surface of the sheet in a coater.   8. Composition according to claim 1 or 2, or packaging sheet according to claim 3 or suspension according to claim 4 or 5 or process according to claim 6 or 7, characterized in that the dosage is from 750 ppm to 2000 ppm of   active ingredient in paper or cardboard.