SE123770C1

SE123770C1 -

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Publication number: SE123770C1
Authority: SE
Publication date: 1948-01-01

Description

KLASS 39 c:25/01 BESKRIVNING OFFENTLIGGJORD AV KUNGL. PATENT- OCH REGISTRERINGSVERKET BEVILJAT DEN 11 NOVEMBER 1948 PATENTTID FRAN DEN 9 JUNI 1945 PUBLICERAT DEN 11 JANUAR! 1949 Ans. den 10 1945, nr 6597/1945. CLASS 39 c: 25/01 DESCRIPTION PUBLISHED BY KUNGL. PATENT AND REGISTRATION AGENCY GRANTED ON NOVEMBER 11, 1948 PATENT PERIOD FROM JUNE 9, 1945 PUBLISHED ON JANUARY 11! 1949 Ans. of 10 1945, No. 6597/1945.

IMPERIAL CHEMICAL INDUSTRIES LIMITED, LONDON, STORBRITANNIEN. satt att framstalla gjutna konsthartsprodukter °eh darvid erhAllna produkter. IMPERIAL CHEMICAL INDUSTRIES LIMITED, LONDON, UNITED KINGDOM. set out to produce cast synthetic resin products, and thereby obtained products.

IIppfinnare: W. E. F. Gates. Inventor: W. E. F. Gates.

Prioritet begiird frdn den 9 juni 1944 (Siorbritannien). Priority requested from 9 June 1944 (United Kingdom).

Foreliggande uppfinning avser gjutna konsthartsprodukter, i synnerhet transparenta, gjutna konsthartsprodukter. Med en konsthartsprodukt avses Isar en produkt, sorn I huvudsak bestar av en fast polymeriserad etenoidfdrening, framstalld genom polymerisation av en 'eller flera flytande etenoidfOr- eningar, vilka innehalla gruppen varvid den polymeriserade foreningen i huvudsak är fri fran dubbelbildningar. I foreliggande beskrivning komma de ovannamnda flytande etenoidforeningarna att betecknas sasom »monomerer». Lampliga monomerer aro estrar av akrylsyror och substituerade akrylsyror, vinylacetat, styrol och liknande vinylforeningar. The present invention relates to molded resin products, in particular to transparent molded resin products. By a synthetic resin product is meant a product which consists essentially of a solid polymerized ethenoid compound, prepared by polymerizing one or more liquid ethenoid compounds, which contain the group wherein the polymerized compound is substantially free of double formations. In the present description, the above-mentioned liquid ethenoid compounds will be referred to as "monomers". Suitable monomers are esters of acrylic acids and substituted acrylic acids, vinyl acetate, styrene and similar vinyl compounds.

Den volymminskning, som monomera substanser erfara under loppet av deras polymerisation (t. ex. omkring 21 % i fallet metylmetakrylat) gOr det svhrt att polymerisera en monomer, sh att polymeren fullstandigt utfyller den cell, i vilken den gjutes. Denna krympning kan reduceras genom minskning av den mangd monomer, som maste polymeriseras, t. ex. genom partiell polymerisation ay den ursprungliga monomeren fore dess inforande i gjutcellen eller genom anvandning av en sirapsliknande vatska, besthende av en losning av polymer i monomer. En sirapsliknande vatska, innehallande sa litet som 10 % polymer, Sr i allmanhet sh visk5s, att den ej Tan kan renas och det blir endast 10 % minskning i den mangd monomer, som maste polymeriseras, med en motsvarande minskning av krympningen. Degartade hlandningar av monomer och polymer, innehallande hoga halter av polymer hava anvants, varigenom haIten monomer, som skall polymeriseras, avsevart minskas. Dessa blandningar kunna icke hallas, men de kunna tvingas in i for-men ,eller framstallas in situ i formen. Om emellertid sarskilda forsiktighetsatgarder joke vidtagas, blir den gjutna produkten kor nig, och produkter, som annars skulle blivit transparenta, kunna bliva endast halvgenomskinliga pa grund av bristen p5 homogenitet I gjutblandningen. The decrease in volume which monomeric substances experience during the course of their polymerization (eg about 21% in the case of methyl methacrylate) makes it difficult to polymerize a monomer, so that the polymer completely fills the cell in which it is cast. This shrinkage can be reduced by reducing the amount of monomer that must be polymerized, e.g. by partial polymerization of the original monomer prior to its introduction into the casting cell or by using a syrup-like liquid, consisting of a solution of polymer in monomer. A syrup-like liquid, containing as little as 10% polymer, is generally whispered that it cannot be purified and there is only a 10% reduction in the amount of monomer which must be polymerized, with a corresponding reduction in shrinkage. Dough monomer and polymer slurries containing high levels of polymer have been used, thereby significantly reducing the content of monomer to be polymerized. These mixtures can not be held, but they can be forced into the mold, or produced in situ in the mold. However, if special precautionary measures are taken, the molded product becomes corroded, and products which would otherwise become transparent may become only semi-transparent due to the lack of homogeneity in the molding mixture.

I det brittiska patentet 569 684 beskrives ett forsok att Overvinna bristen pa homogenitet och ett salt att framstalla gjutna konsthartser fbreslas, vilket bestar i inforande i en form av en blandning av 35-54 volymdelar fasta partiklar av en polymeriserad etenoidforening med lamplig partikelstorlek och 646 volymdelar av en flytande etenoidmo- nomer, som utgor ett losningsmedel for ifragavarande polymeriserade etenoidforening, vilken blandning Isar en sada"' viskositet, att en stalkula med en diameter av 0,625 Cm tar mellan 14 och 20 sek. far att falla 25 cm i ett rar med en invandig diameter, som Sr stelae an 6,25 cm, och som Or fylld sued blandningen, varvid ifragavarande blandning kvarhalles i formen under icke-polymeriserande betingelser, tills den har blivit atminstone partiellt homogeniserad, och darefter i formen underkastas polymeriseringsbetingelser, tills dess monomera bestandsdel Or praktiskt taget fullstandigt polymeriserad. British Patent 569,684 discloses an attempt to overcome the lack of homogeneity and a salt to produce cast synthetic resins, which consists in introducing in a form a mixture of 35-54 parts by volume of solid particles of a polymerized ethenoid compound having an appropriate particle size and 646 parts by volume. of a liquid ethenoid monomer which constitutes a solvent for the polymerized ethenoid compound in question, which mixture has such a viscosity that a steel ball with a diameter of 0.625 cm 2 takes between 14 and 20 seconds an inside diameter, such as Sr. stelae of 6.25 cm, and filled with sued mixture, the mixture being kept in the mold under non-polymerizing conditions until it has been at least partially homogenized, and then in the mold subjected to polymerization conditions, until its monomeric component Or practically completely polymerized.

Detta forfaringssatt Sr lake fullstandigt tillfredsstaIlande, i synnerhet nar den for homogenisering avsedda blandningen innehaller en katalysator for polymerisation i varme. I sadant fall maste homogeniseringssteget utforas vid lag temperatur, t. ex. rumstemperatur, och kan taga en avsevard tid eller oaksa Or den uppnadda homogeniseringsgraden liten. Aven vid rumstemperatur eller vid mattligt forhOjda temperaturer polymeriseras dessa katalyserade blandningar ofta tamligen hastigt °eh endast partiell homogenisering kan ernas. This process is completely satisfactory, especially when the mixture intended for homogenization contains a catalyst for polymerization in heat. In such a case, the homogenization step must be carried out at low temperature, e.g. room temperature, and may take a considerable time or oaksa Or the degree of homogenization achieved is small. Even at room temperature or at moderately elevated temperatures, these catalyzed mixtures often polymerize rather rapidly and only partial homogenization can be achieved.

Foreliggande uppfinning avser ett forf ringssatt, enligt vilket en deg bestaende air polymer inblandad i monomer hastigt kan homogeniseras utan avsevard polymerisation. Enligt fareliggande uppfinning har man 2— — funnit, att forbattrade gjutna konsthartsprodukter kunna framstallas enligt ett Vidaringssatt, vilket bestar 1 homogenisering vid temperaturer inellan 50 och 80° C av en blandning av 35-80 volymdelar av en pulveriserad, till fast tillstand polymeriserad etenoidforening och 65-20 volymdelar av en flytande monomer eller blandning av monomerer, vilken utgOr ett lasningsmedel for den polymeriserade etenoidforeningen och i vilken en eller flera katalysatorer for polymerisation i ljus aro uppltista eller likformigt dispergerade, varvid bade de fasta och de flytande komponenterna av den for homogenisering avsedda blandningen aro i huvudsak fria frau peroxider eller andra -varmepolymerisationskatalysatorer, varefter blandningen gjutes i en form fore eller efter homogeniseringen och polymeriseras till fast tillstand med tillhjalp av ljusstralar, medan den befinner sig i formen. Det ãr all_ fdredraga, att den fasta polymeriserade etenoidforeningen ãr i sadan pulverform, att den kan gà igenom en sikt med en siktoppning av 0,84 mm och en traddiameter av 0,42 mm och kvarhallas pa en sikt med en sikttippning av 0,30 inm och en traddiameter av 0,188 mm. Det fix lampligt - att den polymeriserade foreningen är en polymer av den eller de anvanda monomererna. 00-0,5 viktsprocent bensoeharts, uranylacetat eller uranylnitrat eller 5 viktsprocent bensylalkohol, varvid alla procenthalter aro baserade pa monomerhalten i blandningen, som skall homogeniseras, aro mycket tillfredsstallande sasom ljuspolymerisationskatalysatorer. Andra ingredienser, sasom pinstificeringsmedel, fargamnen och polymerisationsforhindrare, kunna aven -ffilsattas gjutblandningen under forutsattning att de icke forhindra polymerisationens aktivering av ljusstralar. The present invention relates to a pre-set, according to which a dough-consisting air polymer mixed with monomer can be rapidly homogenized without considerable polymerization. According to the present invention, it has been found that improved cast resin products can be prepared according to a refining method which consists in homogenizing at temperatures between 50 and 80 ° C a mixture of 35-80 parts by volume of a powdered, solid state polymerized ethenoid compound and 65-20 parts by volume of a liquid monomer or mixture of monomers, which constitutes a lasing agent for the polymerized ethenoid compound and in which one or more catalysts for polymerization in light are listed or uniformly dispersed, both the solid and the liquid components thereof for homogenization The mixture is substantially free of peroxides or other heat polymerization catalysts, after which the mixture is cast into a mold before or after homogenization and polymerized to a solid state by means of light rays while in the mold. It is to be understood that the solid polymerized ethenoid compound is in such a powder form that it can pass through a sieve with a sieve opening of 0.84 mm and a wire diameter of 0.42 mm and is retained on a sieve with a sieve tip of 0.30 inm and a wire diameter of 0.188 mm. It is fitting that the polymerized compound is a polymer of the monomer or monomers used. 00-0.5% by weight of benzoic resin, uranyl acetate or uranyl nitrate or 5% by weight of benzyl alcohol, all percentages being based on the monomer content of the mixture to be homogenized, are very satisfactory as light polymerization catalysts. Other ingredients, such as pesticides, dyes and polymerization inhibitors, may also be added to the casting mixture provided that they do not prevent the activation of light rays by the polymerization.

Homogeniseringen kan astadkommas genom upphettning av den ovannalunda blandningen i den cell, i vilken den skall gjutas. Det kan emellertid vara lampligare att fistadkomma detta forlopp i en avskild behallare och darefter tvinga den styva geleartade produkten in i gjuteellen. Vid blandningar med hog monomerhalt kan detta forlopp utforas snabbare i nagon vanlig form av blandare, soin Or tillrackligt kraftig for omroring av de bildande -viskosa lasningarna. Den sistnamnda metoden tenderar emellertid att i blandningen infora luftbubblor, vilka Oro mycket svara att avlagsna. The homogenization can be effected by heating the above-mentioned mixture in the cell in which it is to be cast. However, it may be more convenient to place this process in a separate container and then force the rigid gelled product into the ladle. In the case of mixtures with a high monomer content, this process can be carried out more rapidly in any ordinary form of mixer, which is sufficiently powerful for agitation of the forming-viscous welds. The latter method, however, tends to introduce air bubbles into the mixture, which Oro very much respond to repel.

Polymerisationen kan astadkommas me-deist sadana ljuskallor som dagsljus, en kvicksilveranglampa eller en kolbaglampa. Den temperatur, -vid vilken detta forlopp utfares, beror pa den for polymerisering avsedda monomeren. Det vanliga temperaturomradet Or fran rumstemperatur till 100° C. Nar monomeren utgares av metylmetakrylat, hOr temperaturen lianas tamligen konstant inom omradet fran rumstemperatur till 85° C for att reglera polymerisationen och undvika uppkomsten av bubblor och strimmor. The polymerization can be accomplished by means of such light sources as daylight, a mercury lamp or a carbon rear lamp. The temperature at which this process is carried out depends on the monomer intended for polymerization. The usual temperature range is from room temperature to 100 ° C. When the monomer is composed of methyl methacrylate, the temperature is kept fairly constant in the range from room temperature to 85 ° C to control the polymerization and avoid the formation of bubbles and streaks.

Det liar visat sig att gjutprodukterna, fOr ott man vid fOrfaringssattet enligt foreliggande uppfinning skall erhalla gjutna konsthartsprodukter, som ha en sa hog mjukningstemperatur som majligt och som ha en minimal tendens att sla sig under anvandningsbetingelserna, born upphettas till en temperatur mellan. 100 och 130° C under en period av 30-420 min.. Denna varmebehandling foretages med det mest tilIfredsstallande resultatet, om produkterna kvarbliva i den form, i vilken de gjutits. It has been found that the molded products, in order to obtain in the process of the present invention molded resin products which have as high a softening temperature as possible and which have a minimal tendency to settle under the conditions of use, are heated to a temperature between. 100 and 130 ° C for a period of 30-420 minutes. This heat treatment is carried out with the most satisfactory result, if the products remain in the mold in which they were cast.

FOreliggande uppfinning avser i synnerhet framstallningen av gjutprodukter av polymetylmetakrylat. Det fasta polymeriserade materialet, som anvandes i gjutblandningen, kan erhallas i huvudsak fritt frau peroxider genom upphettning av den polymer, som erhalles genom en sadan masspolymerisationsprocess, som beskrives i den brittiska patentskriften 450 305, enligt vilken polymerisationen utfores i la.ga kammare, vilkas vaggar Oro i stand till en relativ rorelse for kompensation av massans krympning under polymerisationen, eller genom en kornpolymerisationsprocess, sadan som beskrives i den svenska patentskriften 85 159, under 16 timmar till 120° C eller igenom knadning av en sadan polymer under 15-30 minuter pa valsar, som Oro upphettade till 160-180° C. Dessa varmebehandlingsprocesser resultera fOrutom i fOrstoring av peroxider, som Oro Mirvarande i det polymeriserade materialet, Oven i en reduktion av molekylvikten. Detta Or en fordel, ty om en polymer med lag molekylvikt anvandes i gjutblandningen, liar den losning eller gel, som erhalles efter homogeniseringsbehandlingen, lagre viskositet eller elastisk flytgrans, On som skulle vara fallet med en polymer med hog molekylvikt. Alternativt kan, medan man fortfarande erhaller en losning eller en gel med lamplig viskosilet eller elastisk flytgrans, losningen eller gelen innehalla en 'Ogre halt av polymer, nar polymeren har lag molekylvikt, On om den bar hog molekylvikt, och krympningen under polymerisationen reduceras proportionellt. Det lampligaste molekylviktsomradet for polymetylmetakrylat, som anvandas i enlighet med fOreliggande uppfinning, Or melIan 15000 och 100000 matt med H. Standingers inetod (se Berichte der deutschen chemischen Ges. 1934, 67 B, 1347 och foljande). The present invention relates in particular to the preparation of casting products of polymethyl methacrylate. The solid polymerized material used in the casting mixture can be obtained substantially free of peroxides by heating the polymer obtained by such a mass polymerization process as described in British Patent Specification 450 305, according to which the polymerization is carried out in low chambers, the rock A concern for a relative movement to compensate for the shrinkage of the pulp during the polymerization, or by a grain polymerization process, as described in the Swedish patent specification 85 159, for 16 hours to 120 ° C or by kneading such a polymer for 15-30 minutes on rollers, which Oro heated to 160-180 ° C. These heat treatment processes result in addition to the enlargement of peroxides, which Oro is present in the polymerized material, also in a reduction in the molecular weight. This is an advantage because if a low molecular weight polymer is used in the casting mixture, the solution or gel obtained after the homogenization treatment will have a lower viscosity or elastic yield strength which would be the case with a high molecular weight polymer. Alternatively, while still obtaining a solution or gel with a suitable viscose screen or elastic yield strength, the solution or gel may contain an ogre content of polymer when the polymer has a low molecular weight, if it has a high molecular weight, and the shrinkage during the polymerization is reduced proportionally. The most suitable molecular weight range for polymethyl methacrylate used in accordance with the present invention is between 15,000 and 100,000 matt with H. Standinger's method (see Berichte der deutschen chemischen Ges. 1934, 67 B, 1347 and the following).

Foreliggande uppfinning Or sarskilt anvandbar, nar en klar fog erfordras mellan tvit skikt av polymetylmetakrylat eller nar det Or nadvandigt att fylla en ihalighet, I. ex. ett kulhal, i ett skikt med polymetylmetakrylat. I dessa fall pressas del homogeniserade gjutmaterialet in i en cell, vars vaggar bestar av appningen eller halet, som skall fyllas, — —3 och polymerisationen fullbordas in situ. Homogeniseringen kan aven utfaras in situ med tillhjalp ay infraroda stralar, som aro fria Iran ultravioletta och synliga ljusstralar. The present invention is particularly useful when a clear joint is required between two layers of polymethyl methacrylate or when it is difficult to fill a cavity, e.g. a ball hole, in a layer of polymethyl methacrylate. In these cases, some of the homogenized casting material is pressed into a cell, the rocks of which consist of the appendage or tail to be filled, and the polymerization is completed in situ. The homogenization can also be carried out in situ with the help of infrared rays, which are free Iran ultraviolet and visible light rays.

Faljande exempel belyser ytterligare, hur uppfinningen kan utforas i praktiken, men upptinningen fir icke pa nagot satt begransad till exemplen. The following examples further illustrate how the invention may be practiced, but the thawing is not in any way limited to the examples.

Exempel 1. Example 1.

Polymetylmetakrylat, framstallt enligt det forfaringssatt, som beskrivits i den oyannamnda brittiska patentskriften 450 305, desintegrerades och upphettades under 16 timmar i en. ugn vid 120° C. Den maldes darefter i kulkvarn och det pulver, som passerade genom en sikt med en siktoppning av 0,E4 mm och en traddiameter av 0,42 mm men kvarholls ph en sikt med en siktoppning av 0,n mm och en traddiameter av Ooss mm, anya.ndes. 75 volymdelar av detta pulver blandades med 35 volymdelar av en losning av 0,3 yiktsprocent bensoeharts i metylmetakrylat. Polymethyl methacrylate, prepared according to the procedure described in the aforementioned British Patent Specification 450 305, was disintegrated and heated for 16 hours in one. oven at 120 ° C. It was then ground in a ball mill and the powder which passed through a sieve with a sieve opening of 0, E4 mm and a wire diameter of 0.42 mm but retained ph a sieve with a sieve opening of 0, n mm and a traddiameter of Ooss mm, anya.ndes. 75 parts by volume of this powder were mixed with 35 parts by volume of a solution of 0.3% by weight of benzoic resin in methyl methacrylate.

Tya plankonkaya glaslinser med samma diameter, en maximal tjocklek ay 6 mm och parallella sidor bereddes genom slipning och polering. En gummiring med en tvarsektion av 15,9 mm och en sadan inre diameter, att den just kunde passera over linserna, samt med skikt av regenererad cellulosa (cellofan) &Isom foder pa dess lure yta placerades ptt en reflekterande yta omkring en av linserna, vars plana yta var riktad mot den reflekterande ytan, varvid ett skikt av cellofan an. vandes for att fodra gummiringen och skilja den fran linsen. De konkava ytorna hos hada linserna yoro overdragna med en tunn film ay ett vatningsmedel, t. ex. eetyltrimetylammoniumbromid, som i handeln gar under benamningen 5Lissolamine». Polymetylmetakrylat/metylmetakrylatblandningen placerades darefter ph tinsels pa den reflekterande ytan i tillraeklig kvantitet och pa siidant sat", att nar den andra linsen placerades Over blandningen med sin. konkaya yta nedat, dess plana yta var i jamnhajd med gummiringen och mellanrummet mellan de tva linserna och gummiringen var fylld med blandningen, varvid praktiskt taget alla luftbubblorna hade lamnat delta utrymme genom att passera mellan linserna och gummiringen. Thick plankonkaya glass lenses of the same diameter, a maximum thickness of 6 mm and parallel sides were prepared by grinding and polishing. A rubber ring with a cross section of 15.9 mm and such an inner diameter that it could just pass over the lenses, and with layers of regenerated cellulose (cellophane) & Isom lining on its lure surface was placed on a reflective surface around one of the lenses, whose flat surface was directed towards the reflecting surface, with a layer of cellophane applying. used to line the rubber ring and separate it from the lens. The concave surfaces of the hada lenses yoro coated with a thin film ay a watering agent, e.g. ethyltrimethylammonium bromide, which is commercially available under the name 5Lissolamine ». The polymethyl methacrylate / methyl methacrylate mixture was then placed ph tinsels on the reflecting surface in sufficient quantity and then set "that when the other lens was placed over the mixture with its concave surface down, its flat surface was flush with the rubber ring and the space between the two lenses the rubber ring was filled with the mixture, whereby virtually all the air bubbles had left delta space by passing between the lenses and the rubber ring.

En glasplatta placerades over de tya linserna och gummiringen samt halls till den reflekterande ytan med tillhjalp ay skruvtvingor. Denna anordning placerades darefter i en ugn och upphettades till 60° C under 15 minuter. Medan den annu befann sig I ugnen yid 60° C, bestralades den under ytterligare 60 minister rnedelst en 250W kvicksilveranglampa, placerad 20 cm fran glasplattan. Efter en ytterligare torkning under 120 minuter vid 100° C lick anordningen kallna langsamt och togs darefter isar. Darvid erholls en bikonvex lins, sammansatt av polymetylmetakrylat och lamplig far anvandning till glasogon. A glass plate was placed over the thin lenses and the rubber ring and held to the reflective surface with the help of screw clamps. This device was then placed in an oven and heated to 60 ° C for 15 minutes. While it was still in the oven at 60 ° C, it was irradiated for another 60 minutes with a 250W mercury lamp, placed 20 cm from the glass plate. After further drying for 120 minutes at 100 ° C, the device cooled slowly and then ice was removed. Thereby a biconvex lens is obtained, composed of polymethyl methacrylate and suitable for use with glasses.

Exempel 2. volymdelar av det pulyeriserade polymetylmetakrylatet enligt exempel 1 blandades med 50 volymdelar av en losning av 5 viktsdelar bensoeharts i metylmetakrylat. Denna blandning upphettades 15 minuter till 7° C. Example 2. parts by volume of the polymerized polymethyl methacrylate according to Example 1 were mixed with 50 parts by volume of a solution of 5 parts by weight of benzoic resin in methyl methacrylate. This mixture was heated to 7 ° C for 15 minutes.

Tvá skikt av polymetylmetakrylat, s. k. »Perspex», placerades sida vid sida med kanterna pa 0,3 cm avstand, och en sida av Oppningen mellan kanterna, tackes med ett skikt av cellofan med ett hart skid. Blandningen av polymetylmetakrylat/metyhnetakrylat pressades darefter, medan den annu var het, in i denna oppning, varvid man drog forsorg om att undvika inneslutning ay hilt-bubbler. Blandningens niva i oppningen var obetydligt hogre an nivan lies de tva namnda skikten av Oerspex» och den tacktes med ett andra skikt ay cellof an. Blandningen bestralades sued klart solljus under 100 minuter vid atmosfarstemperatur i det Inc. En stark transparent fog erholls mellan de tva skikten av >Perspex> Mir skikten ay cellofan avlagsnades. Two layers of polymethyl methacrylate, so-called "Perspex", were placed side by side with the edges at a distance of 0.3 cm, and one side of the opening between the edges was thanked with a layer of cellophane with a hard ski. The polymethyl methacrylate / methyl acrylate mixture was then forced, while still hot, into this orifice, taking care to avoid entrapment in the hilt bubbler. The level of the mixture in the opening was insignificantly higher than the level of the two mentioned layers of Oerspex »and it was thanked with a second layer of cellophane. The mixture was irradiated with sued clear sunlight for 100 minutes at atmospheric temperature in the Inc. A strong transparent joint was obtained between the two layers of> Perspex> Mir layers ay cellophane was removed.

Exempel 3. Example 3.

Ett ark ay polystyrol med en medelmolekylvikt av 150 000, faststalld enligt viskositetsmetoden, finfOrdelades och siktades, varvid for sig tillyaratogs det pulver, som hade samma storlek som ovan angivits for pul-vret i exempel 1. 60 delar av detta polymera pulver blandades med 40 delar av styrolmonomeren och 0,1 del bensoin (d. V. S. 0,25 % pa mangden monomer), och blandningen homogeniserades for hildandet av en deg genom upphettning vid 70° C under 15 minuter. 2 delstycken av polystyrol placerades vid sidan av yarandra med sina kanter p5. ett aystand fran varandra av 3,18 mm och ena sidan av detta mellanrum mellan kanterna tacktes riled ett cellofanark med fast under-lag. Polystyrol/styroldegen pressades darefter fortfarande i varmt tillstfind in i detta mellanrum, varvid luftbasor undvekos omsorgsfullt. Blandningens yta i mellanrummet var nagot hagre an ytan hos de bada arken eller skikten av polystyrol. Detta skikt Overdrogs med ett andra cellofanskikt. Degen utsattes for inverkan ay ultrayiolett ljus fran en kvicksilverbaglampa under 2 timmar, efter yilken tid forbindningen var fullstandigt hard. A sheet of polystyrene having an average molecular weight of 150,000, determined by the viscosity method, was comminuted and sieved, separately taking the powder having the same size as above for the powder of Example 1. 60 parts of this polymeric powder were mixed with 40 parts of the styrene monomer and 0.1 part of benzoin (i.e. VS 0.25% of the amount of monomer), and the mixture was homogenized to form a dough by heating at 70 ° C for 15 minutes. 2 pieces of polystyrene were placed next to each other with their edges p5. a spacing of 3.18 mm apart and one side of this gap between the edges was thanked by a cellophane sheet with a solid substrate. The polystyrene / styrene dough was then still pressed in a warm state into this space, whereby air bases were carefully avoided. The surface of the mixture in the gap was slightly better than the surface of the two sheets or layers of polystyrene. This layer was coated with a second cellophane layer. The dough was exposed to ultraviolet light from a mercury backlight for 2 hours, after which time the bond was completely hard.

Exempel 4. delar ay en granulerad polymer av vinylacetat med en medelmolekylvikt ay 110000, faststallt enligt en viskositetsmetod, blandades med 50 delar monomer vinvlacetat och 0,1 delar bensoin (d. v. s. 0,2 Vo p`a mangden monomer), och blandningen honaogeni- — — serades for bildande av en deg genom upphettning vid 50° G under 15 minuter. Example 4. parts ay of a granular polymer of vinyl acetate having an average molecular weight ay of 110,000, determined by a viscosity method, were mixed with 50 parts of monomeric vinyl acetate and 0.1 part of benzoin (ie 0.2 Vo per amount of monomer), and the mixture honaogenic - - was formed to form a dough by heating at 50 ° G for 15 minutes.

Efter homogeniseringen anvandes degen for att reparera ett hal i ett ark av polyvinylaeetat. Delta utfores genom att placera eft -cellofanstycke pa ena sidan av halet, pressa degen in i halet Iran den andra sidan och placera ytterligare ett cellofanstycke Over degen. Efter att hava utsatt degen for bestralning med ultraviolett ljus under 90 minuter hade densamma hardnat till en klar blasfri massa. After homogenization, the dough was used to repair a slip in a sheet of polyvinyl acetate. Delta is performed by placing eft cellophane piece on one side of the tail, pressing the dough into the tail Iran the other side and placing another cellophane piece Over the dough. After exposing the dough to ultraviolet light for 90 minutes, it had hardened to a clear blast-free mass.

Claims

1. Patent claim: 1. Salt for the production of cast resin products, characterized in that at temperatures between 50 and 80 ° C a mixture of 35-80 parts by volume of a powdered, solid state polymerized ethenoid compound and 65-20 parts by volume of a liquid is homogenized. monomer or a mixture of monomers which constitute a solvent for the polymerized ethenoid compound, and in which there is dissolved or uniformly dispersed one or more light polymerization catalysts, both the solid and the liquid component of the mixture intended for homogenization being substantially free of peroxides or other heat polymerization catalysts, except that the resin is cast in a mold before or after homogenization and the ethenoid compound is polymerized to a solid state by means of light rays while in the mold.

2. A kit according to claim 1, characterized in that the solid polymerized ethenoid compound is in such a powder form that it passes through a sieve with a sieve opening of 0.84 mm and a wire diameter of 0.42 mm and is retained on a sieve with a sieve opening of 0.30 mm and a diameter of 11.183 mm.

Salt according to claim 1 or 2, characterized in that the solid polymerized ethenoid compound is a polymer of the monomer or monomers used.

4. A claim according to any of the foregoing patent claims, characterized in that the monomer consists of methyl methacrylate.

5. A kit according to claim 3 or 4, characterized in that peroxides or other heat polymerization catalysts have been enlarged in the solid polymerized ethenoid compound by heating and, if desired, kneading at 120-180 ° C.

6. A kit according to claims 1-3, characterized in that the polymerized ethenoid compound consists of polymethyl methacrylate with a molecular weight of Indian 15,000 and 100,000.

7. A claim according to any one of the preceding claims, characterized in that the light polymerization catalyst in the monomer or monomers consists of benzoic resin, uranyl acetate or uranyl nitrate.

8. A kit according to claim 7, characterized in that the monomer or monomers contain 0.1 to 0.5% by weight of polymerization catalyst.

9. Set according to any one of claims 1 to 6, characterized in that the monomer or monomers contain 3% of benzyl alcohol as polymerization catalyst. 14. according to one of the preceding patent claims, characterized in that the products produced are heated for 30-120 minutes to 100-130 ° C, after they have been polymerized to a solid state with the aid of light rays. 15. According to patent claim 10, it can be claimed that the heat treatment of the casting products is effected in the molds in which we! ha de gjutas. 16. Synthetic resin products made according to any one of the procedures set forth in the foregoing patent claims. Stoekkoka 1048. Kung /. Buktr. P. A. tiorstedt &St; ner 480089