DE1446890A1 - Guns and explosives and processes for their manufacture - Google Patents

Description

DR. ELISABETH JUNG, DR. VOLKER VOSSIUS, DIPL.-ING. GERHARD COLDEWEY

8 MONKS 23 . SIEGESS T H ASS E 26 · TEL EFO N 345067 ■ TELEGRAM ADDRESS: IN VENT / MONCHEN

U.Z. C 261

Patent application.PI ¹ I 46 390.7 (O 10 0Π2 .VIb / 78c)

OLIH MATIIIESON CHEMICAL CORPORATION Hew York, M.Y. V.St.A.

Guns and explosives and processes for their manufacture

Priority: IB. April 1963 / V.St.A. Anrrielde-Mr. 273 820

The present invention relates to gunpowder and explosive powder, and more particularly to new disk-like shaped gunpowder and explosives Explosive powder particles and their manufacture.

BAD ORfQlNAL 90 9 8 09/0127 ''. .;

New documents (Art. 7, Paragraph I, Paragraph 2, No. I, Clause 3 of the amendment act. V. 4th p. Iv «.

iCKKONTO: MÖNCHEN 60176 · BANK ACCOUNT: DEUTSCHE BANK A. G. MÖNCHEN, LEOPOLDSTR. 71. KTO. NO. 60/35794

U46890

Spherical shaped particles of disintegrant on the base from. Nitrocellulose are produced according to known procedures, in which a varnish of nitrocellulose in a suitable solvent in a non-lusungsmlttelmediuia, such as for example water «is stirred to form spherical droplets of the paint, and the suspension obtained is then heated to evaporate the solvent from the paint, w # », 9 solid spherical shaped nitrocellulose particles suspended in dom jtflehtläsuns & mittmsdium, results · Because of the different burning properties of spherical particles were Efforts made. To produce particles with neutral burning properties, such as discs or flakes. In one process, the solidified become spherical Particles between rollers, generally in the presence of water, pressed to two practically parallel flattened seldom to build. The method needs improvement as the many process stages increase the cost of the process and the irregular shapes of the particles give rise to the burning properties adversely affect the product.

■ »

In another method, the suspension of the nitrooellulose alok in the Hichtlösurigsmlttelmedlua becomes a very exposed to strong movement, causing some flattening of the.

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Laokkugel Ionen causes; Subsequently, the solvent is evaporated from the lacquer "which results in solid, saw-like shaped particles." This process is also suitable for the production of disc-like shaped nltrocallulose particles; The most varied of particles have to be “large”, and the product must be subjected to a green separation stage in order to obtain particles of practically uniform size sino opening is squeezed in the absence of water and the stick is sunk into disks, which with warned air; to remove the solution-eralttelü been heated. Because of the fire risk of the LÖGurgsmittel and the exploitation of the cold water, the danger can be dangerous for the operating personnel. There was now no procedure for Induntria sur VcrlUgung. in Qegenv; kind of water ii \ einfsohor un ^r l safer Weis © sahelheu & rtig gefcrtnto Kitroc "9lluloset" ileben of prakblßah einhftifeliohar örösse and

The main aim of the present invention is this don’t have known methods for the production of "ohe Eat molded nitrocellulose part of non-adherent Naohtoilu

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turn off.

Another. It is an object of the present invention to provide an improved process for the manufacture of solbene shaped Ki tz'ooel lulosetellchen «

Still another object of the invention is elimination

the rolling stage in the manufacture of cinder-like soles powders

Another object of the invention is to provide a means of reducing the risk of fire and explosion in a process for the manufacture of sooty-shaped nitrocellulose particles.

Still another object of the invention is a method for producing disc-shaped nitrooellulose powder directly a suspension of a paint based on nitrooellulose In a Non-solvent mediura.

Yet another object of the invention is to provide new egg-shaped nltrooallulose particles.

Dleso and endor «objectives un-i objects of the invention are made. can be found in the following detailed description.

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It has been found that solid, disk-like shaped nitrocellulose parts are practically uniform in shape and form Shape can be easily produced by a new process, i.e. a lacquer of suitable viscosity by dissolving Nitrocellulose is produced in a solvent for this purpose « which contains water droplets in an emulsified form, the lacquer through one or more openings in an aqueous non-solvent medium to form a strand of lacquer on each Opening is squeezed out «Each bead of lacquer is cut into slices of the desired thickness« while it is in contact Bit the aqueous non-solvent mediura is located «whereby the Thickness is noticeably less than the diameter of the strand « and the solvent in the presence of water from the obtained disks to form solid disk-like shaped ones Mitrocellulose particles evaporated »The diameter of the Disc can be easily controlled with the help of the opening through which the strand is formed and the thickness can be easily controlled by the speed at which the strand passes through the opening is cut «control. Since the usual value level and the usual size separation level both omitted «will result in a considerable reduction in costs the production of the disk-like shaped nitrocellulose parts achieved by the new way of working. Also are the fire and explosion hazards largely to a minimum

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down, since the nitro-cellulose varnish is in contact with a watery Hediua during the sowing process.

In the interior, the IaoIc is duroh on nitrocellulose basls Dissolve water-heated nitrocellulose in a volatile Solvents made for theee. The nitrocellulose can fully or partially purified fasriga nitrooellulose be in forta of nitrided flakes «lintero or wood pulp · She kami dense gelatinized Hitrooelluloee in Fora from before « In a fresh or deteriorated form, the powder may be of good, unhealthy or indifferent stability. she can nitrocellulose from other processes, such as a Dust and schism or voliuninöseo powder and Geaohützpulvery. The nitrocellulose can have any suitable degree of filtration, for example a solids content such as about 11.0 and about 13.9 utw.-ji,

Every "fltiohtlga Lueungs & ilttel fttr Kitroeellulose" the "inside Boiling point below that of water, or another Non-Seungfsaltfcelträgors and practically not with water Btisohbar or aur partially miscible, can with the Her * ■ Position the paints to be used. To typical examples suitable solvents of this type include Äfchylacetjtfc, Ethylene catalytic converter. " Ethyl formate, isopropyl acetate, diethyl

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ketone and Oealeche vga these.

A sufficient amount of solvent is used to dissolve the water-heated nitrocellulose in the manufacture of the varnish, to achieve a viscosity between about 12 and about 100 and preferably between about 1 and 25 seconds, measured according to the following method. us rustproof "steal ■ it" has a diameter of about 8 m (5/16 inch) and a "oewloht of 60 g, which has a flAobes sod and a round marking 58 _# T" ■ (2 5/1 β iaeb) van de If the end has a flat end, the flat band is brewed near the bottom on a Laokeenge *, wclMl the temperature of the lacquer is 60 * C b »trH4-t, and that for the rod up to KU« sinking in eu the 58.7 « ■ (2 5/16 in) deep mark required. Long time is considered as the * viscosity of the paint ·. XHe KaotroUe of the viscosity of the Laeks is extremely important in the preparation of the disk-like shaped silobes. V «m the viscose fiber more ferineer than about. J2 Seicanden is, iwsteAt the Hel """ ₄ that" a Jfcmdverden occurs, ν / Λ the "KishtiesuBgSBittelaediu" formed in the "KishtiesuBgSBittelaediu" attached a spherical pore, which up after the solidification

is retained * However, if the viscosity is in the "defined above" range, the surface tension of the received Lseksehslbsu for that: «ε the XAGktailchwa their The aobel-like pona is retained until it has solidified. .Viscous*! did over 100 seconds young people were told that they were

808B08 / 0T ??

then. Eochdru3kpuEj? An Sinn squeezing out the ImcUb required.

Are ss should as much water in the paint irorhsnäen be * that "anti · lusted Waeeertröpfohtä without forming a susKtsliohan se" secreted aqueous phase formed a "hotsogen · dispersion is obtained by V'assartröpfchen in the paint · Bin proportion water area ZVL & ahnn sth *> and about 30%. The Kitro © "llislos @ in des Lacä is" as has been found "the most effective, dooh kernels also . About the water content of the miieioK. can from the oii'c of the ^fl feix®lite ^R Hitrooellnlos · ziag ^ planes ffasssr staaeen but know «if it siielit aisa ^ sieliend water ip. the nitrocellulose is present ^ dronr.t water sngeg®te £ »er j-> a * iia eiBs Waesarkonzenti'atten in des Letok innei'MIb d @ * et ·?.:, ^ iita ^ iten widths to achieve.

The so produced · I * ök is then dureb 'suitable ürf ^ nng wia irorsngsweise "iuircli" ir i fi "LSAI! I öiTniSQgen"! Iegepr # sst ₉ bit
and «inure Bst & l & ez * riir da @
are-. A suitable type of vofTlelitiingsnear a species is then 2 775? £ 3 and 3 01% 2 ^ 5

S0S80S / 0127

The Nlohtlösungsmlttelmadlua into which the varnish is squeezed is preferably an aqueous medium saturated with dsm solvent, which contains a protective colloid and / or other additives, as described in more detail below. The. Adding the solvent to the water before pressing and cutting the. Laoka ranks prevent the precipitation of mlleellulose gel due to an extratetion of Solvent from the discs through the water.

Other materials can be the lacquer or the soldering medium before or during the extrusion and cutting des Laeks are admitted. Am suitable protective colloid, like for example cornstarch, Qummi. arabic, animal, soher bone glue, dextrin, bentonite and the like about 1.0 oew.-jt based on that present in the mixture Water, appropriate proportions added, Bnerglerelche. Compounds, such as triethylene glycol intrate, Pentaerythritol trinitrate and nitroglycerin can be used with the varnish In each proportion up to about 50 oew.-jS of the mtrocelluloee be added. to increase the burning rate of the solid powder cells ultimately produced su.

important feature of the process according to the invention being that tight control of the specific gravity of the

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-ίο

final sohaibenit-like nitrocellulose parts can be achieved. If it is desired to obtain solid disks with a specific gravity of about 0.6 to about 1.1, a proportion of a water-soluble metal salt which reduces the specific gravity is dissolved in the water emulsion contained in the paint before it is pressed out. The Msngenfentall of water-soluble metal salt, which results in a product having a specific gravity in this range is usually between about 0, X) 1 and about 5 wt. -Ji, based on the information contained in the paint Nltroceilulosa when the water content of, lacks is about 20 wt .- # of the nitrocellulose, the lower the specific gravity of the product. The higher the concentration of the metal salts in the lacquer int. Suitable water-soluble metal salts include sodium sulfate, potassium sulfate, sodium nitrate, potassium nitrate, magnesium nitrate, bariuanifcrate and the like, and mixtures thereof. Although it is not intended to be bound by any theory, 80 it should be mentioned that it is assumed that if the wnGserlösliohsn metal salt were added to the water emulaion de * iAoka in this way the salty water rauaulaion in the paint during the squeezing, cutting and steaming stages Boibo are kept and finally removed in the drying stage, which is porous discs with a low specific weight and desirably fine ceramic items. If an excessive amount

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of water-soluble metal, generally more than about 5 %, based on the Oewloht of the nitrocellulose, is used in the lacquer and the water content is 20 % , the disks obtained are highly porous and generally too brittle to maintain their shape during normal handling. and maintain packaging levels.

If no water-soluble metal salt is used, this has Product generally has a specific gravity in the range between about 1.1 and about 1.2 when the water concentration about 20 ow.-rf of the nitrocellulose cheats. Will a product with a specific weight between about 1.2 and 1.6 is desired, the water-soluble metal salt is added to the aqueous non-solvent medium in a proportionate amount, which corresponds to about 0.25 to 5 ow.-j6 of the Hassers present in the aqueous medium. The water-soluble motor salt is to de »nlohtaqueous medium either before cutting the Squeezed Laok sticks before slicing or before evaporating of the exercise aid * added from the discs »

01 «because of the proportions of water-soluble salts mentioned above The corresponding specific weights of the products are given for illustration only and not as a limitation, since the specific oil content of the product also depends on the amount of water in the

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The lacquer as well as the amount of metal salts dispensed depends on whether the salt is mixed with the water in the lacquer or the unsuitable aqueous ¹ Hediun. For example, if there is more than 20 % water in deä I & ok and if the metal is more than su dea water in the "lacquer sugegel>en" then there will be a lower amount of the solid product obtained for a given amount of metal than and if less be used as sO% water "is so the gl 'l - ohen Nengemantell sais a higher" speslfijiohee Oewioht received *

IcUnnen in the leak before the formation of the Seheiben ande * e! <L ^ t © rialien "as beiepi ^ lsw ^ ise stabilizers" like Dipi '.- nylamii ^ 2-Nltrodipfcer.ylftttiti. Xtb / lcencrellt and the like, Oeterrentiien, such as Dinitrotolu © !, DibutyX £ ihtSuiXat _# Di-

, X hyleeratralit urd like "mia nndere Kodi" means "as belspieleweise lead compounds" Kiss, powdered aluminum and the like., Are eingsbraüht "

kmmm other substances that are t lüontig *

for Hitrooellulose and üem fVüchtigen l ^ sungsfür nitrocellulose miscible with USID Waes & r nioht sisohbar "Utah, ale Vsrdttnnimgsuaiktsl sugegebers wtraen" To tfpisohen Examples of suitable include the liquid Verdtinnungsnsittel

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Kohl "hydrogen, xylene, benzene, pentane, hexane" heptane; Ootan, Monan, Deean, undeoan, Dodeean, and other contractual «Water-immiscible diluents, such as isopropyl ether, propyl ether, cyolohexane, methylojrolohexsn, toluene and the like.

JU is particularly good to use such a diluent if it is intended to use so-called helical powder particles from hol) ·? GraviMetriech certain density of the kind used in central fire ammunition, as this is a diluent Tighten the slices.

Mioh production of “la ·· lacquers with a viscosity within the ranges defined above, this is under suitable“ pressure ”, for example the one achieved by“ ine displacement “pu” po * su an aoohanic graining device, for example in the afore-mentioned a »Erican patent publications 2 775 788 and> 014 2Ί6 Ganaunton Art» guided; . The throughput ittir • d r * Open the Kk tr may be any suitable • lnh "ltllohe QrOM · comprise beiapielswöise ie the range of et *" * 0 76 to about 2.3% w "(.030 to 0.10 inoh ) lie. The pressure applied to the laok pushes it through the openings in the knuckle containing the solvent medium, which makes a string or room from Lmck wife a pressure gauge which the

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HA6890 AH

corresponds to openings, results. The cutting machine is at Rotate around the rods at a suitable speed Slices of any desired thickness, for example to a thickness or ridge between about 0.1 and about 0.8 ms (0.0G ^ to 0.0 ^ 0 inch), cut out. The diameter the disc should exceed the stes of the disc.

When the discs of L & ck are generated, they are suspended in the in the surrounding vessel or Körn ^ ngskammer surrounding the cutting machine contained MiehtlSsungsmittel-BiscSiiM Preferably, the movement ZXM suspending the paint sheets in. The NichtiösungsmittelEieöiuis me the one of the Sctineid knives is caused to reduce the possibility of the generation of abrasion resulting from a breakage of the I & ekscheifeea. · J The temperature and pressure of the paint and the resultant slurry of Lackseheifeen is set to a premature evaporation of the solvent avoided vilrdo Eai AtmosphSrandruplc, a temperature between about 60 and about 65 ⁰ C without significant evaporation of the solvent "! Be turned. Temperatures are used graining over 65 ⁰ C when the system is under a to prevent the evaporator ens sufficient pressure.

909809/0127 _mD

The further work-up of the suspension of the lacquer disks in the nonsolvent medium can be carried out in one of various ways. In one embodiment, the suspension is held in the surrounding vessel until all of the lacquer disks are formed, and this suspension is then batch heated to cause evaporation of the solvent from the laok disks, thereby yielding solidified disk-like shaped nitrocellulose flakes. If necessary, this evaporation stage can be carried out by transferring the suspension from the surrounding vessel into a separate evaporation vessel. In another embodiment, the nonsolvent medium is continuously fed to the surrounding vessel in order to suspend the lacquer disks when they are formed, and the suspension obtained is continuously sucked out of the closed vessel and fed to a suitable evaporation vessel in which the lacquer disks pass through Evaporation of the solvent solidified. After solidification of the nitrocellulose discs by one of these methods, the solid discs can be removed from the nonsolvent medium by any of these methods; , be such as filtration, decantation, or the like {., separated solid-flüsslg separation operation. The moist solids are then dried and can, if desired

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\ 909809/0127 ^NAL

can be glazed ο In addition, the plague bodies can be topped. superficially with any of the above! Detergents .. "I- or modifiers are coated. If so desired can use the above-mentioned detergents or modifiers to the suspension of the solids immediately after evaporation of the solvent or in a separate aqueous suspension or to the dried powder in a heated coating drum for production of the surface coating are added,

The dry product has a very uniform particle size "and no size separation stage is required to obtain a product" which is suitable for use in detonators, handgun ammunition and artillery ammunition. Each nitrocellulose particle has a circular shape

Circumference and has the shape of a straight cylinder. Besides the particles are very strong and very resistant to deterioration and breakage when subjected to severe handling conditions. The lakes according to the invention are disc-like shaped nitrocellulose particles generally show up due to a glossy surface in contrast to the relatively matt appearance of the usual window panes or flake powder. In addition, the new disc-like Mtr © according to the invention have cellulose particles more uniform ballistic properties at temperatures

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I A 4 6 8 9 O

below atmospheric temperature. Stored Vierden Gesehosshulsen that the erfindiingsgemässen disk-like shaped particles include "for example, bai temperatures from -40 ^e C (-40 ° P), no ßörkliche change is present in the pressure or speed after firing ita compared to firing at atmospheric temperatures. In contrast to this *, storage of the usual Flockerraitrocellulose and the rolled Nitrooel.Vulose discs at this temperature and subsequent firing leads to a considerable reduction in pressure and dryness.

The following examples explain the invention without adding to it restrict. All "" parts and percentages are based on weight, unless otherwise stated.

example 1

Vitrooellulose was made by mixing 10 parts wet nitrocellulose with 0, G8f> Parts of potassium nitrate »dissolved; . in water «<8 parts of styiacetate with a content of 0.1 part of dissolved diphenylamine and 2 parts of NitrogXycerin, mixed with 2 parts of Ethylaceta ^ produced * These stocks part · were smeared at a temperature of about 60 ° C, bi «« was formed in hoaogen ^ r Laote. The Viekoaiftttt of the

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Retained lacquer, as determined by the stick sinking technique described above, was adjusted to about 20-25 seconds by removal of solvent. The varnish was placed in a sealed jar under a pressure of about 0.7 atU (10 psig) and then fed by a positive displacement pump to a mechanical graining device of a type similar to that described in U.S. Patent 3,014,2 & 6. The openings in the chamber were about 1.4 mm (0.055 "X") in diameter and the knife was rotated at a speed sufficient to cut the lacquer into disks about 0.25 nira (0.01 ") thick.

A nonsolvent liquid of the following composition was prepared:

Parts Components 70 water 14th animal bone glue ¹ 5 Ethyl acetate 1 Nitroglycerin

The nonsolvent liquid was continuously pumped to the closed vessel of the mechanical granulator, and a suspension of the loaf slices in the nonsolvent liquid was continuously drawn off and

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led to a heated evaporation vessel with a stirring or shaking device, in which the solvent was distilled off ^{from the paint at a temperature of 99 9 C.}

The resulting slurry of solid disk-like shaped nitrocellulose particles in the nonsolvent medium became filtered and the wet nitrocellulose particles were added to the Trookne heated. Virtually all of the particles had a ridge of about 0.2 am (0.008 inch). The product possessed a specific weight of about 1.0 and a packing density of about 0.35 g / ocm.

Example 2

The procedure of Example 1 was repeated with the exception that water-moist new nitrocellulose with a nitrogen content of 1.2% was used as the nitrocellulose source The potassium nitrate was omitted and the lacquer disks were cut to a thickness of 0.127 mm (0.005 inch). The product had a land of about 0.165 now (0.0065 inch) and a specific gravity of 1.50.

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Hatchet game 3

The procedure of Example 1 was repeated with the exception that no potassium nitrate was used in the paint production and sodium sulfate was added to the paint as a dehydrating salt. The product had a web of about 0.114 mm (0.045 inch) and toesass a specific gravity of 1.57.

Example 4 . * '

Using the apparatus of Example 1, 10 parts of nitrocellulose wrung, adjusted to have a nitrogen content of 13.2 $, with 0.1 parts of chalk and 18 parts of solvent mixed, ^the: each was 7 parts of ethyl acetate of 3 parts toluene, wherein 0, 1 part of diphenylamine had been dissolved. These ingredients were heated to a temperature of 60 ° G with agitation and the viscosity was adjusted to about 12 seconds using the stick sink technique. The zack obtained was then worked up as in Example 1. The product consisted of practically flat grains, each having a web of about 0.23 mm (0.009 inch) and a specific gravity of about 1.56. The packing density was about 0.85 g / ccra.

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Example 5

3 batches of disk-like shaped nitrocellulose particles were prepared as in Example 3. These products, which are available as Powders A, B and C, respectively, were designated in equal parts by weight mixed. The properties of each powder and the mixture obtained were as follows:

powder Bridge, well
(inches) gravi
metric
certain
Density, g / ccm A. 0.254
(0.010) 0.660 B. (0.0076) 0.629 C. 0.152
(0.006) 0.664 Mixed
schung 0.185
(0.0073) 0.656

Specific gravity 1.58 1.58 1.59

1.57

The mixture was used to make 20 shotgun cartridges 69.85 ram (2 3/4 inches) long, about 0.4 mm (16 gauge) thick. Super X, approximately 32 g (1 1/8 ounces) charge used. 10 cartridges were fired at room temperature, and 10 cartridges were fired after 16 hours of storage at -4O ⁰ C

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(«40 ⁰ F) fired. Average pressure and average speed were determined, the results are given in the table below. For purposes of comparison, 20 cartridges containing normal pellet nitrocellulose and 20 cartridges containing disc-shaped nitrocellulose formed by rollers made from nitrocellulose balls * were tested in the same way and the results are also given in the table below *

ORDINAL 909809/0127 - ~ ohiu.

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9809/0 * 127

ORIGINAL

ΊΑ46890

From the table it can be seen 1st "that no appreciable change in'dem pressure or velocity occurred · were obtained the 16-hour when firing the mixture according to the invention generated after storage at -40 ° C (-40 ⁰ P) In contrast, a pronounced decrease in pressure and speed when firing the conventional rolled and flaked powder when stored at -4o ° C (-4-0 ⁰ F) under the same conditions.

When the method according to the invention is carried out, the nitrocellulose component is present throughout Procedure through in contact with water. As a result, there is a risk of an unexpected explosion of the nitrocellulose practically turned off. In marked contrast to this, the dry cellulose component is found in the usual one During certain stages of the process, the extrusion process is only in contact with organic solvents and, as a result, must extensive safety measures are taken, to avoid serious unexpected explosions during the extrusion process to prevent.

9Ό 9809/0127

Claims (6)

■ Claims 1. / Method of making disc-shaped powder more uniform Shape and size, with nitrocellulose dissolved in a solvent to form a lacquer, the lacquer through at least an opening squeezed into an aqueous non-solvent at the moment of leakage from the opening while he is is in contact with the non-solvent, in a disk-like manner shaped sections is divided, so that a suspension of lacquer sections in the non-solvent is formed, whereupon the resulting suspension in the non-solvent is heated to evaporate the solvent from the sections and the obtained solid nitrocellulose particles are separated from the suspension, characterized in that the paint initially is produced in the form of an emulsion containing water droplets, this lacquer having a viscosity between about 12 and about 100 seconds at 60 ° C (after the. In the description specified method), whereby the solvent is removed from the particles without affecting their disc, forfeit like shape. "BAD ORIGINAL 909809/0127 2. The method according to claim 1, characterized in that the temperature of the paint and the nonsolvent medium is kept in the range between about 60 and about 65 ⁹ C during the formation of the paintwork. 5- The method according to claim 1 or 2, characterized in that that the solvent used is ethyl acetate. 4. The method according to any one of claims 1 - 3 * thereby ge. indicates that after the disks obtained have been separated from the suspension, the disks are heated to dryness. ^: 5. The method according to any one of claims 1 - ^, characterized in that water-moist nitrocellulose is first dissolved in the solvent for this, sufficient aqueous solution of a water-soluble metal salt is added to the resulting solution to produce a specific gravity lowering - . ,. 'BAD 909809/0127 ■. ". I 4 46 8 90 to yield the proportion of the metal salt, wherein the total weight of the solvent water added up to about 30 parts by weight i £ is the nitrocellulose prior to mixing these ingredients in sufficient proportions to provide a paint with einer.Viskosität at '6O ⁰ C between about 12 and about 100 seconds to get 6. The method according to claim 5 » characterized in that the water-soluble metal salt used is potassium sulfate, potassium nitrate or sodium sulfate. 7. The method according to claim 6, characterized in that water-moist nitrocellulose is dissolved in ethyl acetate, the resulting solution as much aqueous solution of the water-soluble Metal salt admits that the water-soluble metal salt in an about 0.01 to about 5 wt .- ^, based on the nitrocellulose, corresponding amount is present, and an aqueous non-solvent medium into which the paint is pressed, used the water and up to about 1 wt .- ^ of a protective colloid, based on the weight of water present in the aqueous nonsolvent medium. - 27 - 8AD ORfGINAL 909809/0127 8 * Disc-like shaped mitrocellulose particles, produced according to the process according to one of claims 1-7 9 · Disc-shaped nitrocellulose particles with a circular one - 28V 90 9809/0127 ORIGIiMAL BATHROOM