Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
  • C08L33/04—Homopolymers or copolymers of esters
  • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
  • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
  • C08L33/12—Homopolymers or copolymers of methyl methacrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F21—LIGHTING
  • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
  • F21V3/00—Globes; Bowls; Cover glasses
  • F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
  • F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
  • F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
  • F21V3/0625—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics the material diffusing light, e.g. translucent plastics
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
  • B29C48/022—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the choice of material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
  • B29K2033/00—Use of polymers of unsaturated acids or derivatives thereof as moulding material
  • B29K2033/04—Polymers of esters
  • B29K2033/08—Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2203/00—Applications
  • C08L2203/20—Applications use in electrical or conductive gadgets
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
  • C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2205/00—Polymer mixtures characterised by other features
  • C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/04—Macromolecular compounds according to groups C08L7/00 - C08L49/00, or C08L55/00 - C08L57/00; Derivatives thereof
  • C08L2666/06—Homopolymers or copolymers of unsaturated hydrocarbons; Derivatives thereof
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
  • C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
  • C08L2666/14—Macromolecular compounds according to C08L59/00 - C08L87/00; Derivatives thereof
  • C08L2666/22—Macromolecular compounds not provided for in C08L2666/16 - C08L2666/20
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
  • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties

Definitions

• a (meth) acrylic composition comprising particles, its method of preparation, its use and object comprising it
• the present invention relates to a polymeric (meth) acrylic composition
• a polymeric (meth) acrylic composition comprising polymeric silicone particles and polymeric (meth) acrylic particles.
• the present invention relates to a polymeric (meth) acrylic composition
• a polymeric (meth) acrylic composition comprising polymeric silicone particles having a weight average particle diameter between ⁇ ⁇ and ⁇ ⁇ and polymeric (meth) acrylic particles with a having a weight average particle diameter between 30 ⁇ and ⁇ ⁇ ⁇ .
• the present invention concerns also the use of such a polymeric (meth) acrylic composition comprising polymeric silicone particles and polymeric (meth) acrylic particles.
• the present invention concerns also an object comprising or made of such a meth) acrylic composition comprising polymeric silicone particles and polymeric (meth) acrylic particles.
• Thermoplastic polymers and especially (meth) acrylic polymers are widely used, including lightning applications. This is mainly due to its characteristics as a highly transparent polymer material with excellent resistance to ultraviolet radiation and weathering. So (meth) acrylic polymers are used for example in lamps, luminaires, light covers, displays, lit shelving, surfaces and illuminated signs.
• the lightning applications have various requests on the (meth) acrylic polymers or the compositions based on (meth) acrylic polymers as light transmission, diffusing power.
• These compositions based on (meth) acrylic polymers comprise generally more or less spherical particles, which are also polymeric particles or organic or inorganic particles.
• the objective of the present invention is to provide a (meth) acrylic polymer composition with satisfying optical properties for lightning applications.
• a further objective of the present invention is to provide a process for producing a (meth) acrylic polymer composition with good optical properties and surface properties for lightning applications .
• Another objective of the present invention is to provide a (meth) acrylic polymer composition which combines exceptional transmission and diffusion properties at the same time.
• Another objective of the present invention is to provide a
• (meth) acrylic polymer composition that has a high light transmission, at least 80%, and at the same time having a high relative diffusing power and hiding power, in order to hide the light source.
• Another objective of the present invention is to provide a (meth) acrylic polymer composition that has a high light transmission, at least 80%, and at the same time having a high relative diffusing power and hiding power, in order to hide the light source, with a reduced quantities of scattering particles.
• Another objective of the present invention is to provide an object for lightning applications comprising a (meth) acrylic polymer composition with a high light transmission, at least 80%, and at the same time having a high relative diffusing power and hiding power, in order to hide the light source.
• the document WO2004/034136 discloses a bulk diffuser for a flat panel display.
• the bulk light diffuser material may be a sheet or film comprising of polycarbonate and a particulate light diffusing component. PMMA and silicone particles are used separately in the examples, but not in combination together.
• the document JP11060966 discloses a composition for high light diffusion performance.
• the disclosed composition comprises two kind of particles, one with an average diameter less than 5 ⁇ and the other with an average diameter between 5 ⁇ and ⁇ .
• the particles are either silicone or styrene based particles.
• the composition has a low transmission.
• the document DE102012216081 discloses the manufacturing of a light diffusing molded part by injection molding.
• the composition for injection molding comprises a matrix of polymethyl methacrylate and spherical plastic particles with a particle size of 1 to 24 ⁇ .
• the document US 7,897,714 discloses silicone fine particles and a thermoplastic resin composition using the particles.
• the silicone fine particles are used as a diffuser and are having an average particle diameter of about 2.5 ⁇ to 3.5 ⁇ .
• the document WO2004/098857 discloses an injection molding method for the production of light diffusing molded items.
• the molding material comprises a matrix of polymethyl methacrylate and spherical plastic particles with a particle size of 1 to 24 ⁇ .
• the document JP10087941 discloses a light diffusing acrylic resin composition and a light diffusing molding product.
• a silicon rubber powder is used having an average particle diameter of 0.1 to 50 ⁇ .
• the document JP10087945 discloses a light diffusing acrylic resin composition and a light diffusing formed body.
• a silicon rubber powder is used having an average particle diameter of 0.1 to 50 ⁇ .
• the document JP11021357 discloses a methacrylic resin comprising spherical particles of a crosslinked silicone resin.
• the document US 5,831,774 discloses a light diffusion composite.
• the light diffusion layer of the light diffusion material of said comprises an acrylic resin as a binder resin and light diffusing agents including acrylic resin particles and silicone resin particles.
• the two particles represent at least 40 parts by weight of the resin.
• the document JP H01-269902 discloses a light diffusion plate for transmission type screen.
• the composition used comprises two type of particles, a cross-linked organic polymer and spherical silicone particles.
• the quantity of the cross-linked organic particles is in the composition comprising the two particles is from 2 to 6 parts by weight in view of the resin and that of the spherical silicone particles is from 0.02 to 0.5 parts by weight in view of the resin.
• compositions comprising just one type of particles or a mixture of particles in the composition that does not have a satisfying compromise between light transmission and diffusing properties.
• the particle PP1 represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) ;
• a polymeric sheet of 2mm thickness of such a composition has a nearly the identical light transmission as a sheet without any particles.
• composition obtained by a process of preparation of a polymeric composition suitable for making objects said composition comprising:
• a polymeric (meth) acrylic particle PP2 having a weight average particle diameter between 30 ⁇ and ⁇ , characterized that the particle PP1 represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) ,
• said process comprises the step of blending the components a) , b) and c) ; yields to a composition having satisfying compromise between light transmission and diffusing power.
• a polymeric sheet of 2mm thickness prepared from of such a composition has nearly the identical light transmission as a sheet without any particles.
• particle PP1 is represents between
• composition comprising: a) a (meth) acrylic polymer API
• the particle PP1 represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) ;
• a moulded object in form of polymeric sheet of 2mm thickness of such a composition has a nearly the identical light transmission as a sheet without any particles.
• composition comprising:
• the particle PP1 is represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 is represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) .
• the present invention relates to a process of preparation of a polymeric composition (suitable for making objects said composition) comprising:
• particle PP1 represents between
• the present invention relates to the use of a composition
• a composition comprising:
• the particle PPl represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) for making an obj ect .
• Still another aspect of the present invention relates to a object comprising a polymer composition or made of a polymeric composition, said polymer composition is comprising:
• the particle PPl represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) .
• alkyl (meth) acrylate as used is denoted to both alkyl acrylate and alkyl methacrylate.
• copolymer By the term “copolymer” as used is denoted that the polymers consists of at least two different monomers.
• thermoplastic polymer as used is denoted a polymer that turns to a liquid or becomes more liquid or less viscous when heated and that can take on new shapes by the application of heat and pressure.
• PMMA methyl methacrylate
• composition according to the invention it comprises a (meth) acrylic polymer API, polymeric silicone particles PPl having a weight average particle diameter between ⁇ and ⁇ and polymeric (meth) acrylic particles PP2 having a weight average particle diameter between 30 ⁇ and ⁇ , characterized that the particle PPl represents between 0.05wt% and 2wt% of the composition comprising the components a) , b) and c) and that the particle PP2 represents between 5wt% and 20wt% of the composition comprising the components a) , b) and c) .
• the weight ratios of the particles of component b) and c) are calculated on the sum of the three components a) , b) and c) .
• the particle PP2 represents between 6wt% and 20wt% of the composition comprising the components a) , b) and c) , more preferably between 7wt% and 20wt%, still more preferably between 8wt and 20wt%, even more preferably between 9wt% and 20wt%, advantageously between 10wt% and 20wt%, more advantageously between 10wt% and 19wt% and most advantageously between llwt% and 19wt%.
• the particle PPl represents between 0.06wt% and 1.9wt% of the composition comprising the components a), b) and c) , more preferably between 0.07wt% and 1.8wt%, still more preferably between 0.08wt and 1.7wt%, even more preferably between 0.09wt% and 1.6wt%, advantageously between 0.09wt% and 1.5wt%, more advantageously between 0.09wt% and 1.4wt% and most advantageously between 0.1wt% and 1.4wt%.
• the (meth) acrylic polymer API it is a polymeric polymer chain comprising at least 50wt% of monomers coming acrylic and/or methacrylic monomers.
• the (meth) acrylic polymer could also be a mixture of two or more (meth) acrylic polymer API and AP2 or API to APx .
• the acrylic and/or methacrylic monomers are chosen from acrylic acid, methacrylic acid, esters of acrylic acid of esters of methacrylic acid, alkyl acrylic monomers, alkyl methacrylic monomers and mixtures thereof.
• the monomer is chosen from acrylic acid, methacrylic acid , alkyl acrylic monomers, alkyl methacrylic monomers and mixtures thereof, the alkyl group having from 1 to 22 carbons, either linear, branched or cyclic; preferably the alkyl group having from 1 to 12 carbons, either linear, branched or cyclic .
• the meth) acrylic monomer is chosen from methyl methacrylate , ethyl methacrylate , methyl acrylate, ethyl acrylate, methacrylic acid, acrylic acid, n-butyl acrylate, iso-butyl acrylate, n- butyl methacrylate, iso-butyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, isobornyl acrylate, isobornyl methacrylate and mixtures thereof.
• Other comonomers can be copolymerized with the acrylic and/or methacrylic monomers as long as the (meth) acrylic polymer API is comprising at least 50wt% of monomers coming acrylic and/or methacrylic monomers in its polymeric chain.
• the other comonomers can be chosen from styrenic monomers as styrene or styrene deriviatives , acrylonitrile , vinylesters as vinylacetate .
• the amount of these comonomers is from 0wt% to 50wt%, preferably from 0wt% to 40wt%, more preferably from 0wt% to 30wt%, advantageously from 0wt% to 20wt%.
• the (meth) acrylic polymer API is a homo- or copolymer of methyl methacrylate (MMA) that comprises at least 50%, preferably at least 60%, advantageously at least 70% and more advantageously at least 80% by weight of methyl methacrylate .
• MMA methyl methacrylate
• the copolymer of methyl methacrylate comprises between 50% and 99.9% by weight of methyl methacrylate and between 0.1 and 50% by weight of at least one monomer having at least one ethylenic unsaturation that can copolymerize with methyl methacrylate .
• these monomers are well known and mention may be made, in particular of acrylic and methacrylic acids and alkyl- (meth) acrylates in which the alkyl group has from 1 to 12 carbon atoms.
• alkyl group has from 1 to 12 carbon atoms.
• the comonomer is an alkyl acrylate in which the alkyl group having from 1 to 4 carbon atoms.
• the copolymer of methyl methacrylate comprises from 80% to 99.8% advantageously from 90% to 99.7% and more advantageously from 90% to 99.5% by weight of methyl methacrylate and from 0.2% to 20% advantageously from 0.3% to 10% and more advantageously from 0.5% to 10% by weight of at least one monomer having at least one ethylenic unsaturation that can copolymerize with methyl methacrylate.
• the comonomer is chosen from methyl acrylate or ethyl acrylate or mixtures thereof.
• the (meth) acrylic polymer API has a melt flow index (MFI) according to ISO 1133 (230 °C/3.8kg) between O.lg and 20g/10min.
• melt flow index is between 0.2g and 18g/10min, more preferably between 0.3g and 16g/10min, advantageously between 0.4g and 13g/10min.
• the (meth) acrylic polymer API has a refractive index between 1.46 and 1.52, preferably between 1.47 and 1.52 and more preferably between 1.48 and 1.52.
• the (meth) acrylic polymer API has a light transmittance according to ASTM D-1003 (sheet of 3mm thickness) of at least 85%, preferably 86%, more preferably 87%.
• the (meth) acrylic polymer API has a Vicat softening temperature of at least 90 °C.
• the Vicat softening temperature is measured according to ISO 306:2013 (B50 method) .
• the composition according to the invention can comprise beside the (meth) acrylic polymer API also an (meth) acrylic polymer AP2.
• the (meth) acrylic polymer API and (meth) acrylic polymer AP2 form a mixture or a blend.
• This mixture or blend consists of at least one homopolymer and at least one copolymer of MMA, or a mixture of at least two homopolymers or two copolymers of MMA with a different average molecular weight or a mixture of at least two copolymers of MMA with a different monomer composition.
• the polymeric silicone particle PP1 it is having a weight average particle diameter between ⁇ and ⁇ , the particles comprises polysiloxanes chains having an inorganic silicone-oxygen backbone chain.
• the polymeric silicone particle PP1 has a refractive index between 1.30 and 1.45, preferably between 1.35 and 1.45, advantageously between 1.36 and 1.44.
• the weight average particle diameter of the polymeric silicone particle PP1 is preferably between ⁇ and 9 ⁇ , more preferably between ⁇ and 8 ⁇ , still more preferably between ⁇ and 7 ⁇ , even more preferably between ⁇ and ⁇ , advantageously between ⁇ and 5 ⁇ and more advantageously between ⁇ and 4 ⁇ .
• the bulk density of a powder of the polymeric silicone particle PP1 is between 0.1 and 0.5g/ml, preferably between 0.15 and 0.45g/ml.
• the polymeric silicone particle PP1 can for example be prepared according to US 2008/124549.
• the polymeric silicone particle could also be a blend of two or more different silicone particles PPla, PPlb.... , as long as all silicone particles have the before mentioned characteristics.
• polymeric (meth) acrylic particle PP2 having a weight average particle diameter between 30 ⁇ and ⁇ , it comprises at least 50wt% of monomers coming from acrylic and/or methacrylic monomers in the polymer chains of the polymeric particle PP2.
• the polymeric (meth) acrylic particle PP2 is a homo- or copolymer of methyl methacrylate (MMA) that comprises at least 50%, preferably at least 60%, advantageously at least 65% and more advantageously at least 70% by weight of methyl methacrylate.
• MMA methyl methacrylate
• (meth) acrylic particle PP2 is preferably between 35 ⁇ and 90 ⁇ , more preferably between 35 ⁇ and ⁇ , even more preferably between 40 ⁇ and ⁇ and advantageously between 45 ⁇ and ⁇ and most advantageously between 48 ⁇ and ⁇ .
• the polymeric (meth) acrylic particle PP2 is crosslinked.
• (meth) acrylic particle PP2 is less than 5wt% .
• the crosslinker is preferably chosen from an organic compound having at least one acrylic or methacrylic function and a second double bond which can polymerize as well.
• the polymeric (meth) acrylic particle PP2 has a refractive index between 1.49 and 1.56, preferably between 1.50 and 1.55.
• the polymeric (meth) acrylic particle PP2 can be prepared according to suspension polymerization.
• the polymeric (meth) acrylic particle could also be a blend of two or more different (meth) acrylic particles PP2a, PP2b...., as long as all silicone particles have the before mentioned characteristics .
• the process is made by compounding.
• Said process is also capable for the preparation of a polymeric composition suitable for making objects with said composition .
• the process for the preparation of a polymeric composition suitable for making moulded objects comprises also at least one of the following steps
• composition comprising a) (meth) acrylic polymer API and a b) polymeric silicone particle PPl having a weight average particle diameter between ⁇ and ⁇ with a c) polymeric (meth) acrylic particle PP2 having a weight average particle diameter between 30 ⁇ and ⁇ ;
• composition comprising a) (meth) acrylic polymer API, a b) polymeric silicone particle PPl having a weight average particle diameter between ⁇ and ⁇ and a c) polymeric (meth) acrylic particle PP2 having a weight average particle diameter between 30 ⁇ and ⁇ with an additional quantity of (meth) acrylic polymer API or a (meth) acrylic polymer AP2.
• the weight ratio between silicone particle PPl and polymeric (meth) acrylic particle PP2 in the composition is chosen that the polymeric (meth) acrylic particle PP2 is always in excess.
• the ratio by weight of polymeric (meth) acrylic particle PP2 to silicone particle PPl is at least 2/1, more preferably 5/2 and even more preferably at least 10/1, advantageously at least 20/1 and most advantageously at least 25/1.
• the weight ratio of the silicone particles PPl in the composition is less important than weight ratio of the polymeric (meth) acrylic particle PP2.
• the absolute weight of the silicone particles PPl is in minority in view of polymeric (meth) acrylic particle PP2.
• the weight ratio of the polymeric (meth) acrylic particle PP2 in the composition is more important than weight ratio of the silicone particles PPl.
• the absolute weight of the polymeric (meth) acrylic particle PP2 is in excess in view of silicone particles PPl.
• the polymeric (meth) acrylic particle PP2 of the composition according to the invention have an excess quantity in wt% in the composition that is at least two times the quantity of the silicone particles PPl.
• the polymeric (meth) acrylic particle PP2 of the composition according to the invention have an excess quantity in wtl in the composition that is at most four hundred times than the quantity of the silicone particles PP1.
• the weight average particle diameter of the polymeric (meth) acrylic particle PP2 in the composition is more important than the weight average particle diameter of the silicone particle PP1.
• the polymeric (meth) acrylic particle PP2 of the composition according to the invention have an weight average particle diameter that is at least three times more important than the weight average particle diameter of silicone particles PP1.
• the weight average particle diameter of polymeric (meth) acrylic particle PP2 is at least five times more important, more preferably seven at least times more important, still more preferably at least ten times more important than the weight average particle diameter of silicone particles PP1.
• the polymeric (meth) acrylic particle PP2 of the composition according to the invention have an weight average particle diameter that is at most one hundred times more important than the weight average particle of diameter silicone particles PP1.
• the weight average particle diameter of polymeric (meth) acrylic particle PP2 is at most eighty times more important, more preferably at most seventy times more important, still more preferably at most fifty times more important than the weight average particle diameter of silicone particles PP1.
• the refractive index of silicone particles PP1 is less important than the refractive index of the (meth) acrylic polymer API of the composition according to the invention.
• the difference of refraction index between the (meth) acrylic polymer API and silicone particles PP1 is at least 0.01, more preferably at least 0.02 and still more preferably 0.03.
• the refractive index of the polymeric (meth) acrylic particle PP2 is more important than the refractive index of the
• the difference of refraction index between the polymeric (meth) acrylic particle PP2 and the (meth) acrylic polymer API is at least 0.005, more preferably at least 0.01 and still more preferably 0.015.
• the refractive index of silicone particles PP1 is less important than the refractive index of the (meth) acrylic polymer API and the refractive index of the polymeric (meth) acrylic particle PP2 is more important than the refractive index of the (meth) acrylic polymer API .
• the present invention concerns a process for making an object by transforming and/or processing the polymeric composition according to the invention.
• the transformation can be made by injection moulding, extrusion, coextrusion or extrusion/blow molding. Preferably the transformation is made by injection moulding or extrusion.
• the process for making a moulded object according to the invention comprises the steps of
• composition comprising the (meth) acrylic polymer API, silicone particles PP1 and polymeric (meth) acrylic particle PP2,
• melt flow index of the (meth) acrylic polymer API in this first preferred embodiment of the process for making an object is between 1.5g and 13g/10min
• This process for making a object according to the invention comprises the steps of
• the object obtained by extrusion possesses a certain surface roughness .
• the present invention concerns the use of the composition for making an object or a moulded object.
• composition according to the invention can be used for making an object or a moulded object or article or be used to be part of an article.
• composition obtained by the process according to the invention can be used to be transformed directly into an article or object or can be part of an article or object.
• the present invention concerns an object or a moulded object made of the polymeric composition according to the present invention.
• the object or moulded object of the invention can be in form of a sheet, block, film, tube or profiled element.
• the moulded object is a sheet, which can be plain or slightly bent or curved.
• Examples for object or moulded objects or articles are covers or plates for luminous devices.
• the moulded object is a cover for a light source.
• the cover generally has a thickness of between 0.001 and 15 cm, preferably between 0.01 and 10 cm, more preferably between 0.05 and 7 cm, more preferably between 0.1 and 5 cm and even more preferably between 0.2 and 4 cm.
• the composition according to the invention can used as a covering for a point light source.
• the light source plus cover forms a luminous device.
• the cover may be a single layer, or may be a multi-layer structure.
• the cover is separated from the light source by a distance of between 0.11 and 50 cm, preferably between 1 and 40 cm, preferably between 2 and 20 cm and even more preferably between 3 and 20 cm.
• the luminous device according to the invention has a variety of applications such as, for example:
• the cover may especially have the form of a letter, a number, a symbol or any other sign
• the luminous device may be a headlamp, a daytime light, a direction indicator, a stop light, a fog lamp, reversing light, etc.
• the luminous device may be a headlamp, a daytime light, a direction indicator, a stop light, a fog lamp, reversing light, etc.
• optical properties of the polymers are measured according to following method: light transmittance and haze are measured according to the standard ASTM D1003, sheets of 2mm thickness for molded samples. A haze-gard plus apparatus from BYK- Gardner is used.
• Refractive index is measured with a refractometer .
• Particle size is measured by Laser diffraction with a Coulter Counter.
• the silicone particle PP1 is additive 30-424 from Dow Corning.
• the weight average particle diameter is between ⁇ and 3 ⁇ .
• polymeric (meth) acrylic particle PP2 in the examples is used a commercial product from ALTUGLAS BS110 having generally a weight average particle diameter between 35 ⁇ and 60 mand a batch having a weight average particle diameter of 50 ⁇ was used.
• Polymeric particle PP3 is an optical modifier, Paraloid EXL 5137 from Rohm and Haas, which is used according to its datasheet to reduce gloss and increase opalescence.
• the weight average particle diameter is between 5 ⁇ and ⁇ .
• a copolymer of methyl methacrylate having a melt flow index of 8g/10min is used as (meth) acrylic polymer API and silicone particles PP1 and polymeric (meth) acrylic particle PP2 are blended with the (meth) acrylic polymer API.
• the blending is made by compounding with a two screw extruder.
• compositions are prepared as for examples with the same meth) acrylic polymer API .
• the comparative examples comprise either only one kind of particle or two kind of particles with a particle size outside the claimed range.
• compositions of the respective samples are transformed to sheets having a thickness of 2mm.
• the samples comprising silicone particles PP1 and polymeric (meth) acrylic particle PP2 have a good compromise between all characteristics, haze close to 100%, a transmission TO close 90% or more, and a good relative diffusing power. While using less than 10wt% of polymeric (meth) acrylic particle PP2 in combination with 0.2wt% of silicone particles PP1 as in examples 2 and 3 a RDP2 of more than 0.70 is obtained, which requires much more quantity of particles as shown in comparative examples 5 and 6, for achieving this level. [0120] Some of the compositions of table 1 are transformed t sheets by extrusion.
• the extruded sample comprising silicone particles PP1 and polymeric (meth) acrylic particle PP2 have a good compromise between all characteristics, haze of 100%, a transmission TO close 85%, a good relative diffusing power and a very low gloss.

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• 2016
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