JPH0723284B2 - Biocidal granule composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a biocidal granule composition, and more particularly to a biocidal granule composition having high biological efficacy, easy storage and transportation of products, and disintegration upon application. The present invention relates to a biocidal granule composition having excellent properties and dispersibility.

[Conventional technology]

There are several types of biocides used today such as powders, emulsions, wettable powders, granules and flowables. Among them, granules are important for labor saving of pests and weed control systems. It can be used as a pesticide for soil treatment and water surface treatment as it is safe and convenient and can be applied with little loss.
It is a rational dosage form that has been widely applied to herbicides, insecticides and fungicides.

Ordinary granules include various biocide raw materials as active ingredients, bentonite, talc, clay, kaolin, calcium carbonate, and other inorganic mineral powders as active ingredients, and starch, polyvinyl alcohol, gelatin, CMC, sodium alginate as binders. Granules have been added. In addition, in order to improve disintegration dispersibility, a nonionic surfactant or anionic surfactant may be added, or a carboxylic acid polymer may be added for the purpose of further improving spreadability.

Although several granulation methods are mentioned, in the case of a solid drug substance, after carrying out dry pulverization with a jet ohmizer, etc., after kneading by adding a carrier, a binder, an appropriate amount of water, etc., extrusion granulation It is often manufactured by a method such as.

[Problems to be solved by the invention]

However, even if the granules produced by such a method are excellent in disintegration and spreadability, the particle size of the biocide is
Since it is as large as 10 to 60 μm, it has a problem that it has a weak penetrating power to plants and insect bodies and cannot obtain a sufficient killing effect.

[Means for solving problems]

Therefore, the inventors of the present invention have conducted extensive studies and as a result, if the dispersion liquid of the biocidal substance was stirred with a rigid body medium of 0.5 mm or less, 50% by weight or more of particles having a particle size of 0.5 μ or less were made into fine particles. If a biocidal substance is obtained, and if the micronized biocidal substance thus obtained is used as an active ingredient, the biological effect is high, and there is no bottom hard caking or thickening associated with the natural sedimentation of the biocidal substance. It was found that a suspension-type agricultural chemical preparation excellent in stability can be obtained, and a patent application was previously filed (Japanese Patent Laid-Open No. 61-63601).

However, since the above suspension formulation is not always advantageous in terms of storage and transportation, further research on granulation has been conducted this time, and as a result, a micronized biocide was identified with a specific dispersant and a mineral substance carrier. Granulation with a particle size and bulk specific gravity makes it possible to suppress environmental pollution due to powder scattering during handling, is easy and advantageous in storage and transportation, and has a good disintegration dispersibility when poured into water. The inventors have found that a product can be obtained and completed the present invention.

That is, the present invention relates to the following components A to D and A. A. A micronized biocide having 50% by weight or more of particles having a particle size of 0.5 μ or less 1 to 30% by weight B. The following (1) to (4 ), (1) A water-soluble or water-dispersed biopolymer containing one or more selected from the group of monomers consisting of unsaturated carboxylic acids and derivatives thereof as an essential component, (2) styrene sulfonate A (co) polymer, (3) a formalin condensate of a sulfonated polycyclic aromatic compound which may have a hydrocarbon group as a substituent, or a salt thereof, (4) an alkali metal phosphate, 1 selected from One or two or more kinds of dispersants 0.1 to 15% by weight C. Mineral carrier 50 to 98.4% by weight D. Binder 0.1 to 10% by weight as a granular material containing as an essential component, the average particle diameter of the granular material those but that 0.1 to 5 mm, bulk density to provide a biocide for particle composition which is a 0.25~1.30g / cm ³ A.

The micronized biocide according to the present invention needs to have 50 wt% or more of particles having a particle size of 0.5 μ or less, and it is preferable that the overall average particle size is 0.5 μ or less. In particular, it is preferable that 70 wt% or more of the particles have a particle size of 0.5 μ or less, and the overall average particle size is 0.4 μ or less.

The biocide according to the present invention includes any biocide which is insoluble in water and solid at room temperature regardless of its type. And, any of the biocides can obtain the excellent biological effect which has not been heretofore considered by the microparticulation of the present invention. The biocide may be used in combination of two or more biocides having different structures.

As a biocide which is insoluble in water and solid at room temperature, a biocide such as bentrate (methyl-1- (butylcarbamoyl)-
2-benzimidazole carbamate, Takegaren (3
-Hydroxy-5-methylisoxazole), Fuji One (diisopropyl 1,3-dithiolane 2-ylidene malonate, Collatotop (1,2,5,6-tetrahydro-4H-
Pyrrolo [3,2,1-ij] quinolin-4-one), orizemate (3-allyloxy-1,2-benzisothiazole
1,1-dioxide), beam (5-methyl-1,2,4-triazole {3,4-b} -benzothiazole) and the like;
Herbicides include nip (2,4-dichlorophenyl-p-nitrophenyl ether), MO (p-nitrophenyl-2,4,
Diphenyl ether herbicides such as 6-trichlorophenyl ether) and clomethoxynil (2,4-dichlorophenyl 3′-methoxy-4′-nitrophenyl ether); Swep (methyl-3,4-dichlorcar) Carbamate herbicides such as vanillate; Xylon (1-
Urea herbicides such as (α, α-dimethylbenzyl) -3- (p-tolyl) urea; simazine (2-chloro-4,6)
-Bis (ethylamino) -1,3,5-triazine) and other triazine herbicides; and uribest (α- (2-naphthoxy) propionanilide), sunbird (4-
(2,4-dichlorobenzoyl) 1,3-dimethyl-5-pyrazolyl p-toluenesulfonate), pretilachlor (2-chloro-2 ', 6'-diethyl-N- (2-propoxyethyl) acetanilide), vasaglan ( 3-Isopropyl-2,1,3-benzo-thiadiazin-4-one
2,2-dioxide) and so on; for insecticides DDT (1,1,1-
Trichlor-2,2-bis (para-chlorophenyl) -ethane) and other organochlorine insecticides; Kayaace (para-dimethylsulfamylphenyldiethylphosphorothionate) and other aromatic phosphorus insecticides; Denapone (1
-Naphthyl-methyl carbamate) and other carbamate insecticides; and oxamyl (methyl N ', N'-dimethyl-N-{(methylcarbamoyl) oxo} -1-thiooxamidate), orthotran (O, S-dimethyl)
N-acetylphosphoramidothioate), padane (1,
3-bis (carbamoylthio) -2- (N, N-dimethylamino) -propane hydrochloride) and the like.

The micronized biocide according to the present invention has a particle size of the biocide dispersion.
It is easily produced by stirring with a rigid medium of 0.5 mm or less, and is added to the biocidal granular composition of the present invention in an amount of 1 to 30% by weight.

The dispersants (1) to (4) used in the present invention are specifically those described below, and of course they may be added when the biocide is pulverized. These dispersants may be used alone or in combination of two or more.

(1) A water-soluble or water-dispersible polymer containing, as an essential component, one or more selected from the group of monomers consisting of unsaturated carboxylic acids and their derivatives.

Examples of the monomer used for producing the polymer (1) include unsaturated monocarboxylic acids such as acrylic acid and methacrylic acid,
Unsaturated dicarboxylic acids such as maleic acid, derivatives thereof such as alkyl esters of the above acids (such as methyl esters), alkali metal salts (such as soda salts), ammonium salts and organic amine salts (such as triethanolamine salts),
There are mixtures of these. In addition to these monomers, vinyl acetate, isobutylene, diisobutylene, as a copolymerization component,
Copolymerizable monomers such as styrene can also be added.

The method of polymerizing these monomers is a conventionally known method. The ratio of the monomer components and the degree of polymerization of the polymer are not particularly limited, but the polymer needs to be at least water-soluble or water-dispersible.

Specific examples include acrylic acid polymer, methacrylic acid polymer, acrylic acid and methacrylic acid copolymer, acrylic acid and acrylic acid methyl ester copolymer, acrylic acid and vinyl acetate copolymer. Polymers, copolymers of acrylic acid and maleic acid, copolymers of maleic acid and isobutylene, copolymers of maleic acid and styrene, and salts of these with alkali metals, ammonia and organic amines. To be Two or more kinds of these polymers can be used.

(2) (Co) Polymer of Styrene Sulfonate A polymer of styrene sulfonate can be easily produced by polymerizing styrene sulfonate or sulfonation of polystyrene. The styrene sulfonate polymer has a skeleton represented by the following formula.

The molecular weight is 1000 or more, preferably 10,000 to 3,000,000. M
Means an alkali metal salt such as Li, Na, K or NH ₃ , an alkylamine, an alkanolamine and the like.

Moreover, the polymer of styrene sulfonic acid may be a copolymer of styrene sulfonate and another monomer. Such a copolymer can be easily produced by copolymerizing styrene sulfonate with another monomer or by sulfonation of a copolymer of styrene and another monomer.
In the case of copolymerization, it may be in a range that does not impair the effects of the present invention. As a monomer for copolymerization, a hydrophobic monomer such as alkyl acrylate, alkyl methacrylate, vinyl alkyl ether, vinyl acetate, ethylene, propylene, butylene, butadiene, diisobutylene, vinyl chloride, vinylidene chloride, acrylonitrile, styrene, etc. Body, acrylic acid, methacrylic acid, maleic acid, fumaric acid, maleic anhydride, vinyl alcohol, acrylamide, methacrylamide, diacetone acrylamide,
Hydrophilic monomers such as N-vinylpyrrolidone, 2-acrylamido-2-methylpropanesulfonic acid and methallylsulfonic acid are used.

(3) A formalin condensate of a sulfonated polycyclic aromatic compound, which may have a hydrocarbon group as a substituent, or a salt thereof.

Specifically, it is a formalin condensate such as a petroleum sulfonic acid derivative, a lignin sulfonic acid derivative, or a naphthalene sulfonic acid derivative.

The compound (3) according to the present invention is, for example, naphthalene,
It can be obtained by sulfonation of an alkyl-substituted naphthalene, anthracene, an alkyl-substituted anthracene, lignin, or one having an aromatic ring in a petroleum residue by a general method, followed by a salt-forming reaction and further formalin condensation. In this case, the condensation degree is preferably 1.2 to 30, and more preferably 1.2 to 10. Here, when the condensation degree is 1.2 or less, the effect of condensation is small, and when it exceeds 30,
Since it has a high molecular weight, it causes a problem in practical use due to its solubility and the like.

As the polycyclic aromatic compound to be used, various ones can be used, but it is preferable to use lignin, naphthalene or alkylnaphthalene having 1 to 6 carbon atoms, and of course, a mixture thereof. .

Examples of the salt include alkali metals such as sodium and potassium, alkaline earth metals such as calcium, amine, ammonium salts and the like.

(4) Examples of the alkali metal phosphate include sodium tripolyphosphate, potassium pyrophosphate, sodium pyrophosphate, sodium hexametaphosphate, monobasic sodium phosphate, dibasic sodium phosphate, and tribasic sodium phosphate. You may use 1 or more types from the inside.

The above-mentioned dispersants are contained in the biocidal granular composition of the present invention in an amount of 0.1 to 15
It is blended by weight%. The proportion of the micronized biocide in the composition of the present invention and the above dispersant is such that the dispersant / micronized biocide (weight ratio) = 1/1 to 1/50, preferably 1/6 to 1/40. Is.

Further, as a dispersant other than the above, a nonionic surfactant,
You may use together an anionic surfactant. Specific examples of the nonionic surfactant and the anionic surfactant are shown in (5) and (6) below. These dispersants may be used alone or in combination of two or more kinds, but it is not preferable to add them at the time of pulverization because problems such as foaming may occur, so it is desirable to add at the time of granulation. 0 to 20% by weight, preferably 1 to 10% by weight
Is.

(5) Examples of the nonionic surfactant include polyoxyethylene (hereinafter referred to as POE) alkyl (having 6 to 2 carbon atoms).
2) Ether, POE alkyl (C4-18) phenol ether, polyoxypropylene polyoxyethylene (block or random) alkyl ether, POE phenylphenol ether, POE styrenated phenol ether, POE tribenzylphenol ether .

(6) As the anionic surfactant, lignin sulfonate, alkylbenzene sulfonate, alkyl sulfonate, POE alkyl sulfonate, POE alkyl phenyl ether sulfonate, POE alkyl phenyl ether phosphate ester salt, POE phenyl phenol ether sulfonate, POE phenyl phenol ether phosphate salt, naphthalene sulfonate, naphthalene sulfonic acid formalin condensate, POE tribenzyl phenol ether sulfonate, POE tribenzyl phenyl ether ether phosphate Salt or the like is used.

There are several methods for producing the biocidal granule composition of the present invention. For example, one or more compounds selected from the above-mentioned micronized biocide and dispersants (1) to (4) are contained. A mineral carrier and, if necessary, one or more compounds selected from (5) and (6), a binder (binder), etc. are added to an aqueous slurry (hereinafter referred to as micronized biocide slurry) and mixed. After smelting, a method of producing by a known method such as a tumbling granulation method or an extrusion granulation method, a micronized biocide slurry containing the dispersant of (1) to (4), or (5), (6) if necessary. The compound obtained by adding at least one compound selected from the above) to the mineral carrier while granulating with a binder or the like, or by spray-drying the micronized biocide slurry. A method of granulating by adding a mineral substance carrier, a binder, etc. to powder Masui.

Mineral carriers used here include wax, talc, kaolin, calcium carbonate, bentonite, silica powder, coal stone powder, acid clay, diatomaceous earth powder, gypsum, pumice powder,
There are shellfish powder, mica powder, colloidal sodium silicate hydrate, etc., and the blending ratio in the granular biocide composition is 50-
98.4% by weight is preferred.

Specific examples of the binding agent (binder) include natural water-soluble polymers such as xanthan gum, xanthur, pectin, gum arabic, and guar gum, and methylated products of cellulose or starch derivatives, carboxyalkylated products, and hydroxyalkylated products (methylcellulose, carboxy). (Including methyl cellulose, hydroxymethyl cellulose, etc.)
And semi-synthetic polymers such as polyacrylic acid salt, polymaleic acid salt, polyvinyl alcohol, polyvinylpyrrolidone, and lignin sulfonate. The content of the binder in the granular biocide composition is preferably 0.1 to 10% by weight, more preferably 0.5 to 5% by weight.

In the composition of the present invention, in addition to the above, polyoxyethylene-, if necessary, within a range not impairing the effects of the present invention.
A coagulation inhibitor such as polyoxypropylene block polymer, or a decomposition inhibitor such as epichlorohydrin, phenyl glycidyl ether or allyl glycidyl ether may be added. The blending amount of these components is
A total of 0 to 7% by weight is preferable in the composition of the present invention.

〔The invention's effect〕

Since the biocidal granule composition of the present invention is granular, storage,
It has excellent stability and is extremely easy to transport without scattering during handling. Further, the biocide is made into fine particles, the biological effect is remarkably enhanced as compared with the conventional biocides having a large particle size, and the above-mentioned dispersants (1) to (4) are contained. Therefore, it is also very excellent in disintegration after application and dispersibility of the biocide.

〔Example〕

Next, the present invention will be described with reference to Preparation Examples, Examples and Test Examples, but the present invention is not limited to these Examples.

<Preparation Example 1> Preparation sample 1: 20 parts by weight of beam (bactericide) powder, formula (Molecular weight of the above formula compound is 680,000) 4.0 parts by weight of water-soluble copolymer salt, 76 parts by weight of water and 200 parts by weight of 0.1-0.2 mm glass beads (media) are mixed (media / dispersion) Liquid volume ratio = 67/33) and rotate the disk for 12 hours in the sand grinder. The temperature in the sand grinder is 20-25 ° C. Further, when this is pressurized, 60 parts by weight of the fine particle beam dispersion liquid is obtained. If the media is washed twice with 70 parts by weight of water, 98% by weight of the beam can be recovered.

As shown in Table 1, this atomized beam has a particle size distribution of 80% by weight of particles having a particle size of 0.5 μ or less.

Prepared Sample 2: Ekskusoni (herbicide) 30 parts by weight, formula (The molecular weight of the above formula compound is 380,000) 3.5 parts by weight of a water-soluble copolymer salt represented by the formula, 66.5 parts by weight of water and 180 parts by weight of 0.1-0.2 mm glass beads (media) are mixed (media / dispersion). Liquid volume ratio = 69/31), and rotate the disk for 10 hours in the sand grinder. The temperature in the sand grinder is 20-25 ° C. Further pressurization of this gives 70 parts by weight of a microparticulate Exgouni dispersion.

As shown in Table 2, this microparticulate Exxghoni
Particles having a particle size of 0.5μ or less have a particle size distribution of 90% by weight.

Preparation Sample 3: Denapon (insecticide) 25 parts by weight, formula (The molecular weight of the above formula compound is 480,000) 3.5 parts by weight of the water-soluble copolymer salt represented by the formula, 71.5 parts by weight of water and 180 parts by weight of glass beads (media) of 0.1 to 0.2 mm are mixed (media / Dispersion volume ratio = 69/31) and rotate the disk for 15 hours in a sand grinder. The temperature in the sand grinder is 20-25 ° C. Further pressurization of this gives 75 parts by weight of a finely divided denapone dispersion.

This micronized denapone, as shown in Table 2, is 0.5μ
The particles having the following particle sizes have a particle size distribution of 87% by weight.

Preparation Sample 4: Oxamyl (insecticide) powder 30 parts by weight, formula (The molecular weight of the above formula compound is 220,000) 4.5 parts by weight of a water-soluble copolymer salt represented by: 65 parts by weight of water and 187 parts by weight of glass beads (media) of 0.1 to 0.2 mm are mixed (media / dispersion). Body volume ratio = 50/50) and rotate the disk in the sand grinder for 8 hours. The temperature in the sand grinder is 20-25 ° C. Furthermore, when this is pressurized, 45 parts by weight of the finely divided oxamyl dispersion is obtained.

As shown in Table 2, this finely divided oxamyl has 0.5
Particles having a particle size of μ or less have a particle size distribution of 74% by weight.

<Example> After adjusting the water content of the micronized biocide obtained in Preparation Samples 1 to 4, a predetermined amount of mineral powder and other components were added, and extrusion granulation was performed according to the following formulation. Then, a granular biocide composition was obtained, and the formulation examples 1 to 4 were obtained. In addition, as a comparative formulation example, a biocidal granule composition using an ordinary drug substance that has not been microparticulated was prepared.

Prescription example 1: (Average particle size 0.7 mm, bulk specific gravity 0.97 g / cm ³ ) (wt%) Beam 4 Dispersant 0.8 Bentonite 92.2 Polyvinyl alcohol 2 Polyoxyethyl (10) nonylphenol ether 1 Prescription example 2: (Average Particle size 1.9 mm, bulk specific gravity 1.15 g / cm ³ ) (wt%) Ekskusoni 7 Dispersant 0.8 Bentonite 90.2 Sodium lignin sulfonate 2 Formulation Example 3: (Average particle size 3.4 mm, Bulk specific gravity 1.21 g / cm ³ ) (weight %) Denapon 5 Dispersant 0.7 Calcium carbonate 61.3 Clay 30 Polyvinyl alcohol 2 Lauryl phosphate diethanolamine salt 2 Prescription example 4: (Average particle size 2.7 mm, bulk specific gravity 1.04 g / cm ³ ) (wt%) Oxamyl 1 dispersant 0.2 clay 95.8 sodium polyacrylate sodium 2 dialkyl sulfosuccinate 1 Comparative formulation example 1 :( average particle size 0.7 mm, bulk density 1.01 g / cm ³⁾ (wt%) beam 4 bentonite 93 Po Vinyl alcohol 2 polyoxyethylene (10) nonylphenyl ether 1 Comparative Formulation Example 2 :( average particle size 2.0 mm, bulk density 1.17 g / cm ³⁾ (wt%) Etsukusugoni 7 bentonite 90 lignosulfonate sodium 3 Comparative Formulation Example 3: (Average particle size 3.4 mm, bulk specific gravity 1.22 g / cm ³ ) (wt%) Denapon 5 Calcium carbonate 61 Clay 30 Polyvinyl alcohol 2 Lauryl phosphate diethanolamine salt 2 Comparative formulation example 4: (Average particle size 2.5 mm, Bulk specific gravity 1.05 g / cm ³ ) (wt%) Oxamyl 1 Clay 95 Sodium polyacrylate 2 Sodium dialkylsulfosuccinate 2 <Test Example 1> Using Formulation Example 1 and Comparative Formulation Example 1 obtained in Examples, the following method was used. Conducted a biological test. The results are shown in Table 3.

(Test method) A 3-leaf stage rice (variety: Nihonbare) was transplanted to a plastic stick of 40 cm x 60 cm and grown in a greenhouse. 7-8 rice
When grown in the leaf stage, the water depth was adjusted to 2.5 cm and prescription example 1
Also, the beam granules of Comparative Prescription Example 1 were applied in respective predetermined amounts. The average particle diameter of the beam particles in Comparative Prescription Example 1 was 10.3μ.
15 hours after the chemical application, the rice blast fungus spore suspension was sprayed. After spraying spores, store in a greenhouse for 5 days and
The number of lesions on 10 leaves was investigated and the control value was calculated by the following formula.

<Test Example 2> Using the formulation example 2 and the comparative formulation example 2 obtained in the examples, a biological test was conducted by the following method. The results are shown in Table 4.

(Test method) Put paddy soil in a plastic stick of 40 cm x 60 cm,
After pouring paddy water to a depth of 3 cm and mixing and allowing to stand, sowing pine nuts and noviers, planting rice seedlings (variety: Nihonbare), and after 5 days, treating each with a predetermined amount of Exxgoni granules of Example 2 and Comparative Prescription Then, the plant was kept in a flooded state with a water depth of 2.5 cm for 14 days, and the occurrence of residual grass and the occurrence of chemical damage were observed.

In addition, the particle size of the Exxgoni particles of Comparative Prescription Example 2 is 12.8.
It was μ.

<Test Example 3> Using the formulation example 3 and the comparative formulation example 3 obtained in the examples, a biological test was conducted by the following method. The results are shown in Table 5.

(Test method) 40 cm x 60 transplanted rice seedlings (variety: Nihonbare) at the 5 leaf stage of true leaves
A plastic bag (cm) was submerged to a water depth of 2.5 cm, and each prescribed amount of Denapon granules of Formulation Example 3 and Comparative Formulation Example 3 was treated. The particle size of the Denapon particles of Comparative Prescription Example 3 is 9.
It was 5μ. Twenty-four hours after the chemical treatment, 10 larvae of the leafhopper leafhoppers were released per strain and stored in a greenhouse for 24 hours, and then the mortality was examined.

<Test Example 4> Using the formulation example 4 and the comparative formulation example 4 obtained in the examples, a biological test was conducted by the following method. The results are shown in Table 6.

(Test Method) The soil in which root-knot nematodes lived was placed in a 6-inch pot, and a predetermined amount of the oxamyl granules of Formulation Example 4 and Comparative Formulation Example 4 was applied. The particle diameter of the oxamyl particles of Comparative Formulation Example 4 was 12.8μ. After the chemical treatment, sowing seeds of Kiyuri,
Thirty days later, the lilies were dug out, the number of root lumps was measured, and the effect was judged.

Evaluation criteria: 5 ・ ・ ・ ・ No root bumps 4 ・ ・ ・ ・ ・ ・ 1-5 roots occur on one root 3 ・ ・ ・ ・ ・ ・ 6-10 hits on one root 2 ・ ・ ・ ・ ・ ・ 1 root 11 to 15 generated in 1 ... 16 to 20 generated in one root <Test Example 5> Water (3 degrees hard water) was put into a shearley having a diameter of 15 cm and a depth of 2 cm to a depth of 1 cm, and prescription examples 1 to 4 and comparative prescription examples 1 to 1
1 g of the granules of No. 4 was gently placed in the center of the Shearley and the spread area over time was determined. The results are shown in Table 7.

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Claims (1)

[Claims] 1. The following components A to D and A. A. A micronized biocide having 50% by weight or more of particles having a particle size of 0.5 μ or less 1 to 30% by weight B. The following (1) to (4) (1) A water-soluble or water-dispersible polymer containing one or more kinds selected from the group of monomers consisting of unsaturated carboxylic acids and derivatives thereof as an essential component, (2) styrene sulfonate ( (1) selected from the group consisting of: (co) polymers, (3) formalin condensates of sulfonated polycyclic aromatic compounds which may have a hydrocarbon group as a substituent, or salts thereof, (4) alkali metal phosphates. Alternatively, two or more kinds of dispersants 0.1 to 15% by weight C. Mineral carrier 50 to 98.4% by weight D. Binder 0.1 to 10% by weight is contained as an essential component, and the average particle size of the particles is A biocidal granule composition characterized by having a bulk density of 0.1 to 5 mm and a bulk specific gravity of 0.25 to 1.30 g / cm ³ .