BE623387A - - Google Patents

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Publication number
BE623387A
BE623387A BE623387DA BE623387A BE 623387 A BE623387 A BE 623387A BE 623387D A BE623387D A BE 623387DA BE 623387 A BE623387 A BE 623387A
Authority
BE
Belgium
Prior art keywords
parts
styrene
wollastonite
weight
hours
Prior art date
Application number
Other languages
French (fr)
Publication of BE623387A publication Critical patent/BE623387A/fr

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Classifications

    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066Use of inorganic compounding ingredients
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/34Silicon-containing compounds
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11CSTATIC STORES
    • G11C11/00Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor
    • G11C11/02Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements
    • G11C11/06Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element
    • G11C11/06007Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element using a single aperture or single magnetic closed circuit
    • G11C11/06014Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element using a single aperture or single magnetic closed circuit using one such element per bit
    • G11C11/06021Digital stores characterised by the use of particular electric or magnetic storage elements; Storage elements therefor using magnetic elements using single-aperture storage elements, e.g. ring core; using multi-aperture plates in which each individual aperture forms a storage element using a single aperture or single magnetic closed circuit using one such element per bit with destructive read-out
    • G11C11/06028Matrixes
    • G11C11/06035Bit core selection for writing or reading, by at least two coincident partial currents, e.g. "bit"- organised, 2L/2D, or 3D
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2325/00Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Derivatives of such polymers
    • C08J2325/02Homopolymers or copolymers of hydrocarbons
    • C08J2325/04Homopolymers or copolymers of styrene
    • C08J2325/06Polystyrene

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Computer Hardware Design (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Description

       

   <Desc/Clms Page number 1> 
 
 EMI1.1 
 

 <Desc/Clms Page number 2> 

 
 EMI2.1 
 



  Pour la fabrication de corps moules on polymères 
 EMI2.2 
 t t 1, r \.. 1" - lrlyn styrène expansés, on a surtout recours, . Cu.-.y.v .....--- tsiel- le, à un prooédé dans lequel des polymères sous forme de petit- tes particules, qui renferment corme aent gonflnnt, réparti 
 EMI2.3 
 de façon homogène, un liquide ne dissolvant pas le polymère de styrène, sont chauffes dans des moules perméables aux gaz' 
 EMI2.4 
 à dos températures supérieures au point d'ébullition de J'aCent confiait et aux points de ramoll t:.18c:nent des polymères, 
 EMI2.5 
 de telle sorte que les particules gonflent et se soudent entre 
 EMI2.6 
 elles en donnant le corps roulé déciré. Les feuilles mousce.. sont en général préparées par 
 EMI2.7 
 extrusion de mélanges de polymères de styrène et d'agents gon- 
 EMI2.8 
 flants gazeux ou liquidée.

   Il e: t 0,-,' lC::H.mt connu de transfor- mer en feuilles moussas, par extrusion, des né-lances de poly- mères de styrène et de pie: .ente no!'L.:, .r':'I}Ue8 0,-nus lesquels a été introduit par absorption un '.ydi-oc,rbure D.lil'ha.tique à 
 EMI2.9 
 bas ;,oint d'ébullition. 
 EMI2.10 
 



  On 3-iit t "C .1cr.1t:nt que le silicate de calcium naturel, la lO:.iAOtO.^..'.ve, constitue une charge particulièrement appro- priée pour le ;,olyotyr(:ne. Cent air.ci ; -r exerple Que des masses de polystyrène rentc.::-:-. .t t;c:u' 1:. 3e en poids de wolla- stonite, présentent deo f::'orr:(.t8 ni''cniiue3 qui ne s'écartent qu'à peine de cel lea du polyotyr't''ne pur. 



  La présente nvention a pour objet duo matières plas- tiques expansibles pour la fabrication de corps :::1-..:168 :::O'JB8" 
 EMI2.11 
 qui renferment : 
 EMI2.12 
 a) un polymère de styrène contenant au moine 50; 'n poids de styrène polynériaé en mel.-.nce avec les é,utrcD r:.or.o:::':r8o, ,.b) 2 à 20fi par rapport au poids du poly:.;:re, d t...."i L;":HîÍl:1.t 
 EMI2.13 
 gazeux ou liquide, 

 <Desc/Clms Page number 3> 

 
 EMI3.1 
 c) 2 à 40% par rapport 8 poids du polymère, de wollastonite finement divisée. 
 EMI3.2 
 



  Or.' a constaté que des matières plastiques de ce genre- renfermant de la wollastonite, peuvent être transformes en corps mousses moulés de faible densité, ce qui n'est pas pos- sible avec des matières plastiques renfermant un autre p ,:ri ;, inorganique ou du silicate de calcium synthétique présentant la même composition chimique que la   wollaetonite.   



   Les propriétés mécaniques des mousses obtenues partir des matières plastiques suivant la présente invention, sont les mêmes que celles de mousses de polystyrène pur. 



   Pur   poivrières   de styrène, on entend le polystyrène et les copolymères du .styrène avec d'autres composés monomères 
 EMI3.3 
 polymérisa'bles qui renferment, gOlyaz:.sc3ü an mt-lunse avec les autrs6 monomères, plus de 50cié en poids de styrène* Co=e cama- nodn'es appropriés on citera l'acrylonitrile, le v1nylcRrbaze1" le divinylbenzunep les esters des acides acryliques ou métha- crylique et d'alcools à 1 - 8 atones de   carbone.   



     Comme   agents gonflants conviennent des composés 
 EMI3.4 
 orgnnlques gazeux ou liquides dont les points d'ébullition sont inférieurs au point de runollissenent du polymère de styrène et qui re dissolvent pas les polymères  A titre d'exemples de composés or:micue: de ce genre, on citera les hydrocarbures filiphi'.tiques h bas \,oint d'ébullition, par exemple le propane le butane, le 2lent;ne, 1 'te::':9-.!1C, lu cyclohexane o de ::2!:o carbures chlorée, conrie le <ichlo:::'o1i fluor::: t::rillc ou le tri- fluoro- 1-2-2 trichloro-M-2 éthane. 



  La .-i o 11. u s t o n 1c se;l ev ffit;e3c tii.]{e c-j :r forme de granules d'une grosseur :10yo:¯'1e CO:1;: :':" -j '.# t ¯-#. 



  ; 0;! 

 <Desc/Clms Page number 4> 

 
 EMI4.1 
 Les matières plastiques expansibles suivant la pré1;- 
 EMI4.2 
 sente invention peuvent encore renfermer d'autres conutiiuaitts, par exemple des ignifuges, cornue la chloropuraffine ou l'he*a- m bromocyclododé cane, mais également des plastifiants, tela que   @   les esters d'acide phtalique, et des lubrifiants, comme les  @   cires de paraffines ou l'acide stéarique. On peut également¯      
 EMI4.3 
 incorporer des colorants pigaentairca aux matières plastiquée suivent la présente invention. 



  Les matières plastiques expsible6 peuvent tre pré- parées de diverses manières. On peut,   p@r     exemple,   polymériser 
 EMI4.4 
 les monomères en suspension aqueuse, en présence de wollaetoni- te et d'agents gonflants. Il est toutefois aussi possible d'im-   prégner   des mélanges de fines particules de polystyrène et de 
 EMI4.5 
 wollastonite, en nuspunsion aqueuse, avec tan agent gonflant. 



  Des matières plastiques expunoîbtc-ti, finomcnt divioúol3. peuvent encore être obtenues par extrusion de mélanges constitués d'un polymère de .strr:¯n¯(3 de wollaetonite et d'un ngent gonflant, puis, par broyage du mélange extrudé, l'extrusion devant se faire   d.ns   des conditions excluant toute expansion. Les   diffé-   rents constituants des m tières plastiques suivant la présente invention peuvent également être mélanges dans une extrudeuse pour l'obtention de feuilles   nouaces.   



   Les parties et les pour cent indiqués dans les exemples suivants sont des unités en poids. 



   EXEMPLE   1.-   
 EMI4.6 
 Dans un récipient de pression :.iuni d'un agitateur h. ailettes, on met en 3u:p;er.:.:ion un niûl-inge do 140 parties d'hex bromocyclododécune, 11,25 parties de :.eroxyae de benzoyle et 3500 P' rtieu de styrlnn d,.-ic ur.e solution, contenant 4000 par- ties d'e.'.u, 13 r'-rties d'un C.p¯:Ol,',,';.rP de S'5Í de vinylpyrr > '.i#. done et de 5 d'iciyiate de '+,yrl4, et 5 parties de yrcp 1-6- 

 <Desc/Clms Page number 5> 

 phate tétrasodique. On polymérise ensuite pendant 20 heures à 70 C, puis pendant 15 heures à 85 C. 



   850 parties du polymère ainsi obtenu, 150 parties de wollastonite d'une grosseur Moyenne des particules   de 14   et 4 parties de phtalate de dibutylglycol sont transformées en granulés expansibles à l'aide d'une extrudeuse . A partir de cee granulés on peut préparer des mousses difficilement inflam- mables d'une densité de 14 kg m3. 



   Avec des granulés expansibles préparés de la même façon, toutefois avec emploi ue silicate de calcium synthétique, on ne peut obtenir que des mousses d'une densité   de 90   kg m3. 



   EXEMPLE   2 . -   
12 parties de wollastonite d'une grosseur moyenne des particules de 14 sont mises en suspension, dans un récipient à agitateur, dans une solution de 100 parties de styrène, 30 par- ties de polystyrène   d'un   indice K de 60, 0,25 partie d'huile de   silicone   et 0,45 partie de peroxyde de benzoyle. La   suspen-   sion ainsi obtenue eut introduite dans une chaudière étanche à la pression, munie d'un agitateur à ailettes, qui contient une solution de 0,5 partie d'un copolymère de 95% de   vinylpyrroli-   donc et de 5 % d'acrylate de méthyle d'un indice K de 70, et 
0,2 partie de pyrophosphate de sodium dans 200 parties d'eau. 



   On ajoute ensuite 10 parties de   pentane,   puis on polymérise   pend :nt   20 heures à 70 C et pendant 15 heures à 85 C. 



   On obtient des parles expansibles d'une teneur en   cendren   de 9,4% en poids, qui peuvent être transformées en nous- ses d'une densité de 15 kg m3. 



   EXEMPLE 3. - 
800 parties de polystyrène d'un indice X de 61, 200 parties de wollastonite d'unegrosseur moyenne des particules de 14. ainsi que 8 parties de cire de paraffines sont bien mé- 

 <Desc/Clms Page number 6> 

   langées     dans un   tambour mélangeur, puis transformées, à   l'aide   d'une extrudeuse,en granules cylindriques d'une longueur de 
 EMI6.1 
 1 1!:m et d'un diamètre de 111lJ)'\Q 
Dans un récipient de pression muni d'un agitateur ailettes;,   on   dissout, dans 200 parties d'eau, 0,6 partie   d'un   
 EMI6.2 
 copolyo0ro de 95% de vinylpyrrolidone et de 5 d'acrylate de méthyle, d'un indice K do 70. 



   80 parties du granulé obtenu comme décrit à l'alinéa précédent, sont mises en suspension   d:-ns   cette solution; on ajoute ensuite   5,6   parties de pentane, puis on brasse pendant 20 heures   à   température ordinaire, pendant 20 heures à 40 C 
 EMI6.3 
 et pendant 30 heures à 70."C.. On obtient des particules gon- flables pouvent Être transformées en corps mousses d'une den- sité   de   20 kg m3. 



    EXEMPLE 4.-    
Dans un tambour mélangeur, on mélange 850 parties de polystyrène d'un indice K de 61, 150 parties de wollastonite 
 EMI6.4 
 et 7 parties de phtalute de di.:,thylglyeol. On ajoute à la masses à   170 C,   dune une   extrudeuse,   4,5% de   pontane,   puis on   l'extrude à   travers une filière à fente large. On obtient une feuille d'une densité d'environ 80 kg m3. 
 EMI6.5 
 



  'c'y;'t'T)'" <j/....L< ?*'' On transforme en grL....'1ulc3 gonflables, coune décrit à l'exemple 2, 650 piirtiee de polystyrène d'un indice K de 61, 300 parties de wollastonite et 5 parties de   chloroparaffine   d'une teneur en chlore de   70;.. Par   expansion dans des   seules   perméables aux   gaz,.   on peut   préparer   clos corps   '.tousses   coules 
 EMI6.6 
 d'une dt-ncité de 32 kc/r- 3 P:=::J..E 6.-- Dans un récipient de pression muni d'un agitateur à 
 EMI6.7 
 ailettes, 01 dissout, ûane- 5200 parties der? 17 parties d'un 

 <Desc/Clms Page number 7> 

 
 EMI7.1 
 copolyre constitué de 95% de .'Z.i2y.1'^..v.r"Cl'.wr.o,'1 et de 5% r,.v3d?. crylate de méthyle, d'un indice K de z ainsi que z parties 
 EMI7.2 
 de pyrophosphate tétrasodique.

   On ajoute à cette solution une 
 EMI7.3 
 solution de 2200 parties de styrène, 570 parties d'acrylonitr: le, 40 parties de stéarate de butyle et 10,5 parties de perorç de de be7.oyle, puis on polynérise pendant 20 heures à ?0*C 
 EMI7.4 
 et pendant 15 heures à 85  C. 
 EMI7.5 
 



  On transforme 800 parties du polymère ainsi obtenus 200 parties de wollastonite et 5 p-.rties de stéarate de butyli er: granules expansibles corwe décrits l'exemple 3* A partir de ces crapules, on peut préparer des mousses d'une densité'du 22 Jcg/m3, 3 ttbles L l'essence et n'JX huit su. 



  H s v :\ ::¯.;##) J, A bzz .1 l i.....!-=:: 
 EMI7.6 
 Matières plastiques expansibles pour la fabrication 
 EMI7.7 
 de corps moulés nouas? es, c:r;ct,>.3=es en ce qu'elles renfer- 
 EMI7.8 
 ment 
 EMI7.9 
 a) un polymère de styrbne contenant nu .',n;, .s 50; en poids de styrène P01Y::l,:.risÓ en nc'lanje ivrec ics autres rlOnc=.:3:::-es b) 2 à 201--" par rapport (,... ou poids du ,'O/:::¯';'3s d'un 4. -'u o"e+ ...1. gonfle! 
 EMI7.10 
 gazeux ou liquide, et 
 EMI7.11 
 c) 2 à 40% par rapport au poids du poiyraore, de wollastonite 
 EMI7.12 
 finement divisée. 

**ATTENTION** fin du champ DESC peut contenir debut de CLMS **.



   <Desc / Clms Page number 1>
 
 EMI1.1
 

 <Desc / Clms Page number 2>

 
 EMI2.1
 



  For the manufacture of molded bodies or polymers
 EMI2.2
 tt 1, r \ .. 1 "- expanded styrene, one uses above all,. Cu .-. yv .....--- tsiel- le, a process in which polymers in the form of small particles, which contain as it swells, distributed
 EMI2.3
 homogeneously, a liquid which does not dissolve the styrene polymer, are heated in gas permeable molds'
 EMI2.4
 at temperatures above the boiling point of the acid and at the softening points: .18c: nent polymers,
 EMI2.5
 so that the particles swell and coalesce between
 EMI2.6
 they by giving the body rolled up and down. The mousce leaves .. are generally prepared by
 EMI2.7
 extrusion of mixtures of polymers of styrene and gon-
 EMI2.8
 gaseous or liquid flants.

   It is: t 0, -, 'lC :: H.mt known to transform into moussas sheets, by extrusion, styrene and pie polymer ne-lances: .ente no!' L.:, .r ':' I} Ue8 0, -nus which was introduced by absorption a '.ydi-oc, rbure D.lil'ha.tique to
 EMI2.9
 low;, boiling anointed.
 EMI2.10
 



  It is 3-iit t "C .1cr.1t: nt that the natural calcium silicate, lO: .iAOtO. ^ .. '. Ve, constitutes a particularly suitable filler for;, olyotyr (: ne. Cent air.ci; -r exerple That masses of polystyrene rentc.::-:- .tt; c: u '1 :. 3e by weight of wollastonite, present deo f ::' orr :(. t8 ni '' cniiue3 which hardly deviate from that of pure polyotyr't''ne.



  The present invention relates to two expandable plastic materials for the manufacture of bodies ::: 1 - ..: 168 ::: O'JB8 "
 EMI2.11
 which contain:
 EMI2.12
 a) a styrene polymer containing monk 50; 'n weight of styrene polyneriae mixed with the é, utrcD r: .or.o :::': r8o,, .b) 2 to 20fi relative to the weight of the poly:.;: re, d t .... "i L;": HîÍl: 1.t
 EMI2.13
 gas or liquid,

 <Desc / Clms Page number 3>

 
 EMI3.1
 c) 2 to 40%, based on 8 weight of the polymer, of finely divided wollastonite.
 EMI3.2
 



  Gold.' has found that plastics of this kind containing wollastonite can be made into low density foamed moldings, which is not possible with plastics containing another p,: ri ;, inorganic or synthetic calcium silicate having the same chemical composition as wollaetonite.



   The mechanical properties of the foams obtained from the plastics according to the present invention are the same as those of pure polystyrene foams.



   Pure styrene pepper shakers are understood to mean polystyrene and copolymers of .styrene with other monomeric compounds.
 EMI3.3
 polymerisables which contain, gOlyaz: .sc3ü an mt-lunse with the other monomers, more than 50% by weight of styrene acrylic or methacrylic acids and alcohols with 1 - 8 carbon atoms.



     Suitable swelling agents are compounds
 EMI3.4
 gaseous or liquid organics whose boiling points are lower than the point of release of the styrene polymer and which do not re-dissolve the polymers By way of examples of gold compounds: micue: of this kind, we may mention the filiphi'.tiques hydrocarbons low boiling point, for example propane butane, 2lent; ne, 1 'te ::': 9 -.! 1C, lu cyclohexane o de :: 2!: o chlorinated carbides, conrie the < ichlo ::: 'o1i fluor ::: t :: rillc or tri-fluoro- 1-2-2 trichloro-M-2 ethane.



  La.-Io 11. uston 1c se; l ev ffit; e3c tii.] {E cj: r form of granules of size: 10yo: ¯'1e CO: 1 ;:: ': "-j'. # t ¯- #.



  ; 0 ;!

 <Desc / Clms Page number 4>

 
 EMI4.1
 Expandable plastics according to the pre1; -
 EMI4.2
 The invention may still contain other conutiiuaitts, for example flame retardants, retort chloropuraffin or bromocyclododecan he * a- m, but also plasticizers, such as @ phthalic acid esters, and lubricants, such as @ paraffin waxes or stearic acid. We can also
 EMI4.3
 incorporating pigmentary dyes into plasticized materials according to the present invention.



  The expsible plastics can be prepared in various ways. We can, for example, polymerize
 EMI4.4
 monomers in aqueous suspension, in the presence of wollaetonite and blowing agents. However, it is also possible to impregnate mixtures of fine particles of polystyrene and
 EMI4.5
 wollastonite, in aqueous nuspunsion, with a swelling agent.



  Plastic materials expunoîbtc-ti, finomcnt divioúol3. can also be obtained by extrusion of mixtures consisting of a polymer of .strr: ¯n¯ (3 of wollaetonite and of a swelling agent, then, by grinding the extruded mixture, the extrusion having to be carried out under conditions excluding any expansion The various constituents of the plastics according to the present invention can also be mixed in an extruder to obtain knotted sheets.



   The parts and percent shown in the following examples are units by weight.



   EXAMPLE 1.-
 EMI4.6
 In a pressure vessel:. Equipped with a stirrer h. fins, we put in 3u: p; er.:.: ion a niûl-ing of 140 parts of hex bromocyclododecune, 11.25 parts of: .eroxyae of benzoyl and 3500 P 'rtieu of styrlnn d, .- ic ur .e solution, containing 4000 parts of E. '. u, 13 r'-rties of a Cp¯: Ol,' ,, ';. rP of S'5Í of vinylpyrr>' .i #. done and 5 hereyiate of '+, yrl4, and 5 parts of yrcp 1-6-

 <Desc / Clms Page number 5>

 tetrasodium phate. Then polymerized for 20 hours at 70 C, then for 15 hours at 85 C.



   850 parts of the polymer thus obtained, 150 parts of wollastonite with an average size of particles of 14 and 4 parts of dibutylglycol phthalate are transformed into expandable granules using an extruder. Hardly flammable foams with a density of 14 kg m 3 can be prepared from these granules.



   With expandable granules prepared in the same way, however with the use of synthetic calcium silicate, only foams with a density of 90 kg m3 can be obtained.



   EXAMPLE 2. -
12 parts of wollastonite with an average particle size of 14 are suspended, in a stirred vessel, in a solution of 100 parts of styrene, 30 parts of polystyrene with a K index of 60, 0.25 part of silicone oil and 0.45 part of benzoyl peroxide. The suspension thus obtained would have been introduced into a pressure-tight boiler, fitted with a finned stirrer, which contains a solution of 0.5 part of a copolymer of 95% vinylpyrroli and 5% of methyl acrylate with a K index of 70, and
0.2 part of sodium pyrophosphate in 200 parts of water.



   Then 10 parts of pentane are added, followed by polymerization for 20 hours at 70 C and for 15 hours at 85 C.



   Expandable walls with an ash content of 9.4% by weight are obtained, which can be processed into weeds with a density of 15 kg m3.



   EXAMPLE 3. -
800 parts of polystyrene with an X index of 61, 200 parts of wollastonite with an average particle size of 14. as well as 8 parts of paraffin wax are well preserved.

 <Desc / Clms Page number 6>

   dipped in a mixing drum, then transformed, using an extruder, into cylindrical granules with a length of
 EMI6.1
 1 1!: M and with a diameter of 111lJ) '\ Q
In a pressure vessel fitted with a finned stirrer;, dissolved in 200 parts of water, 0.6 part of a
 EMI6.2
 copolymer of 95% vinylpyrrolidone and methyl acrylate, with a K index of 70.



   80 parts of the granule obtained as described in the previous paragraph are suspended in this solution; 5.6 parts of pentane are then added, followed by stirring for 20 hours at room temperature, for 20 hours at 40 ° C.
 EMI6.3
 and for 30 hours at 70 ° C. Swellable particles are obtained which can be transformed into foams with a density of 20 kg m3.



    EXAMPLE 4.-
In a mixing drum, 850 parts of polystyrene with a K index of 61, 150 parts of wollastonite are mixed
 EMI6.4
 and 7 parts of di.:,thylglyeol phthalute. 4.5% pontane is added to the masses at 170 ° C., in an extruder, and then extruded through a wide slot die. A sheet with a density of about 80 kg m3 is obtained.
 EMI6.5
 



  'c'y;' t'T) '"<j / .... L <? *' 'One transforms into grL ....' 1ulc3 inflatable, coune described in Example 2, 650 piirtiee of polystyrene d 'a K index of 61, 300 parts of wollastonite and 5 parts of chloroparaffin with a chlorine content of 70; .. By expansion in only gas permeable, closed bodies can be prepared.
 EMI6.6
 with a dt-ncity of 32 kc / r- 3 P: = :: J..E 6 .-- In a pressure vessel fitted with a
 EMI6.7
 fins, 01 dissolved, ûane- 5200 parts of? 17 parts of a

 <Desc / Clms Page number 7>

 
 EMI7.1
 copolymer consisting of 95% of .'Z.i2y.1 '^ .. vr "Cl'.wr.o,' 1 and of 5% r, .v3d ?. methyl crylate, with a K index of z as well that z parts
 EMI7.2
 tetrasodium pyrophosphate.

   We add to this solution a
 EMI7.3
 solution of 2200 parts of styrene, 570 parts of acrylonitr: le, 40 parts of butyl stearate and 10.5 parts of be7.oyl perorç, then it is polymerized for 20 hours at? 0 ° C
 EMI7.4
 and for 15 hours at 85 C.
 EMI7.5
 



  800 parts of the polymer thus obtained are converted to 200 parts of wollastonite and 5 parts of butyl stearate: expandable granules as described in Example 3 * From these crapules, foams with a density of 22 Jcg / m3, 3 ttbles L gasoline and n'JX eight su.



  H s v: \ :: ¯.; ##) J, A bzz .1 l i .....! - = ::
 EMI7.6
 Expandable plastics for manufacturing
 EMI7.7
 of molded bodies nouas? es, c: r; ct,>. 3 = es in that they contain
 EMI7.8
 is lying
 EMI7.9
 a) a styrofoam polymer containing nu. ', n ;, .s 50; by weight of styrene P01Y :: l,:. risÓ en nc'lanje ivrec ics other rlOnc = .: 3 ::: - es b) 2 to 201-- "with respect to (, ... or weight of, 'O / ::: ¯ ';' 3s of a 4. -'uo "e + ... 1. Inflates!
 EMI7.10
 gas or liquid, and
 EMI7.11
 c) 2 to 40% based on the weight of the poiyraore, of wollastonite
 EMI7.12
 finely divided.

** ATTENTION ** end of DESC field can contain start of CLMS **.


    
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2337168A1 (en) * 1975-12-29 1977-07-29 Arco Polymers Inc EXPANDABLE STYRENE POLYMERS NOT FORMING LUMBLES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2337168A1 (en) * 1975-12-29 1977-07-29 Arco Polymers Inc EXPANDABLE STYRENE POLYMERS NOT FORMING LUMBLES

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