WO2018019764A1 - Article diffusant la lumière - Google Patents

Article diffusant la lumière Download PDF

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Publication number
WO2018019764A1
WO2018019764A1 PCT/EP2017/068634 EP2017068634W WO2018019764A1 WO 2018019764 A1 WO2018019764 A1 WO 2018019764A1 EP 2017068634 W EP2017068634 W EP 2017068634W WO 2018019764 A1 WO2018019764 A1 WO 2018019764A1
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Prior art keywords
propylene
copolymer
dld
composition
heterophasic propylene
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PCT/EP2017/068634
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English (en)
Inventor
Ting Huang
Fu Yang
Liang Wen
Chaodong JIANG
Yubin BAO
Yang Yang
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SABIC Global Technologies BV
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SABIC Global Technologies BV
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Publication of WO2018019764A1 publication Critical patent/WO2018019764A1/fr
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/10—Homopolymers or copolymers of propene
    • C08L23/12—Polypropene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00—Specific properties of additives
    • C08K2201/002—Physical properties
    • C08K2201/003—Additives being defined by their diameter
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2207/00—Properties characterising the ingredient of the composition
    • C08L2207/02—Heterophasic composition

Definitions

  • the present invention relates to a light diffusing article and a lighting device comprising such light diffusing article.
  • Typical transparent resins are aromatic polycarbonate resin, acrylic resin and styrene resin.
  • aromatic polycarbonate resins are widely used as they have good mechanical properties, heat resistance and weatherability and high light transmittance.
  • EP2829574 discloses a light- diffusing resin composition comprising a polycarbonate.
  • organic particles having a crosslinked structure As a light diffusing agent, and examples thereof include crosslinked acrylic particles, crosslinked silicone- based particles and crosslinked styrene-based particles. Further, inorganic particles such as calcium carbonate, barium sulfate, aluminum hydroxide, silicon dioxide, titanium oxide and calcium fluoride, and inorganic fibers such as glass short fibers are also used.
  • WO2010074312 discloses a light diffusion plate comprising a polypropylene resin and a hindered amine light stabilizer having a specific chemical structure.
  • the light diffusion plate preferably further comprises light diffusing particles and/or a nucleating agent.
  • the nucleating agent is sorbitol-based nucleating agents, organic phosphate-based nucleating agents, nucleating agents of metal salts of carboxylic acid and rosin-based nucleating agents.
  • the invention provides a light diffusing article comprising a composition comprising (A) a heterophasic propylene copolymer and (B) a particulate material, wherein the amount of the particulate material is from 0.01 to 1 wt% of the total composition,
  • heterophasic propylene copolymer consists of
  • propylene-based matrix consists of a propylene homopolymer and/or a copolymer of propylene and ethylene or a-olefin consisting of at least 95 wt% of propylene and at most 5 wt% of a-olefin, based on the total weight of the propylene- based matrix and
  • propylene-based matrix is present in an amount of 65 to 85 wt% based on the total heterophasic propylene copolymer and
  • the amount of ethylene in the dispersed ethylene-a-olefin copolymer is at least 40 wt%
  • dispersed ethylene-a-olefin copolymer is present in an amount of 35 to 15 wt% based on the total heterophasic propylene copolymer and
  • a sheet having a thickness of 1 mm made of the composition has a degree of light dispersion DLD T and a haze H T and
  • a sheet having a thickness of 1 mm made of the heterophasic propylene copolymer has a degree of light dispersion DLD R and a haze H R ,
  • composition comprising a heterophasic propylene copolymer with a large increase in the degree of light dispersion without a large change in the haze by the addition of a particulate material.
  • the light diffusing article also has good mechanical properties such as flexural modulus.
  • US2003/0175499 discloses a method for imparting a translucent optical effect to transparent thermoplastic polymers by addition of a particulate, light diffusing material having an average maximum particle size of 0.1 microns to 200 microns.
  • the light diffusing article according to the invention has a small thickness for transmitting the light from the light source, as generally understood in the art.
  • the light diffusing article according to the invention may have any shape, but typical examples include a light diffusing sheet, a light diffusing tube and a light diffusing lightbulb.
  • the thickness of article is 0.2 to 10 mm, for example 0.2 to 5 mm, 0.5 to 5 mm or 0.8 to 3 mm.
  • 'sheet' is herein understood to mean an article having a small thickness and extending in two dimensions perpendicular to the thickness direction.
  • the sheet may also be called a film.
  • 'tube' is herein understood to mean an article having a shape of a hollow cylinder, having a small thickness perpendicular to the axis direction.
  • 'lightbulb' is generally understood in the art, i.e. a housing of a light source such as an LED lamp.
  • the light diffusion property is represented by a degree of light dispersion (DLD), wherein the DLD is defined as the receiving angle that obtains a luminous intensity which equals to the half of a luminous intensity of the vertically transmitted light.
  • the luminous intensity may be measured by a
  • goniophotometer for example GP200 in transmission mode.
  • the light transmittance and the haze are measured according to ASTM D1003.
  • the flexural modulus is measured according to ISO 178 (test geometry: 3.2 mm thickness according to IS037/2, parallel orientation.
  • a sheet having a thickness of 1 mm made of the composition has a degree of light dispersion DLD T and a haze H T and
  • a sheet having a thickness of 1 mm made of the heterophasic propylene copolymer has a degree of light dispersion DLD R and a haze H R .
  • (H T -H R )/H R is at most 2%, preferably at most 1 %, more preferably at most 0.5%.
  • the difference in the haze between a sheet made of the composition and a sheet made of the heterophasic propylene copolymer is very small.
  • H T -H R is at most 1 %, preferably at most 0.5%.
  • H T may e.g. be 80-99%, preferably 90-99%.
  • H R may e.g. be 79-98%, preferably 89-98%, more preferably 90- 98%.
  • (DLDT-DLD R )/DLDR is at least 10%, preferably at least 100%, more preferably at least 400%.
  • DLD T -DLD R is at least 4, preferably at least 5, more preferably at least 8, more preferably at least 10.
  • DLD T is at least 8, more preferably at least 10, more preferably at least 15, more preferably at least 20, more preferably at least 30, more preferably at least 35.
  • the difference in DLD between a sheet made of the composition and a sheet made of the heterophasic propylene copolymer is large.
  • the polypropylene composition in the light diffusion article according to the invention has a melt flow index of at least 0.1 dg/min, at least 0.2 dg/min, at least 0.3 dg/min, at least 0.5 dg/min, at least 1 dg/min at least 1 .5 dg/min, at least 5 dg/min or at least 10 dg/min, and/or for example at most 100 dg/min, at most 50 dg/min, at most 40 dg/min, at most 30 dg/min, at most 25 dg/min, at most 20 dg/min or at most 10 dg/min, measured according to IS01 133 (2.16 kg/230 ⁇ €).
  • the MFI of the heterophasic propylene copolymer may be in the range of 15 to 100 dg/min, measured according to IS01 133 (2.16 kg/230 ⁇ €). In some embodiments, the composition has a melt flow index of 15 to 100 dg/min as determined according to IS01 133 at 230 Q C and 2.16 kg and DLD T is at least 35.
  • the MFI of the heterophasic propylene copolymer may be in the range of 1 to 10 dg/min, measured according to IS01 133 (2.16 kg ⁇ O'O). In some embodiments, the composition has a melt flow index of 1 to 10 dg/min as determined according to IS01 133 at 230 Q C and 2.16 kg and DLD T is at least 5.
  • the composition according to the invention has a flexural modulus measured according to ISO 178 (test geometry: 3.2 mm thickness according to
  • Heterophasic propylene copolymers are generally prepared in one or more reactors, by polymerization of propylene in the presence of a catalyst and subsequent
  • heterophasic propylene copolymers employed in the process according to present invention can be produced using any conventional technique known to the skilled person, for example multistage process polymerization, such as bulk polymerization, gas phase polymerization, slurry polymerization, solution polymerization or any combinations thereof.
  • Any conventional catalyst systems for example, Ziegler-Natta or metallocene may be used.
  • Such techniques and catalysts are described, for example, in WO06/010414; Polypropylene and other Polyolefins, by Ser van der Ven, Studies in Polymer Science 7, Elsevier 1990; WO06/010414, US4399054 and US4472524.
  • the heterophasic propylene copolymer is made using Ziegler-Natta catalyst.
  • the heterophasic propylene copolymer may be prepared by a process comprising - polymerizing propylene and optionally a-olefin in the presence of a catalyst system to obtain the propylene-based matrix and
  • the steps are preferably performed in different reactors.
  • the catalyst systems for the first step and for the second step may be different or same.
  • the heterophasic propylene copolymer of the composition of the invention consists of a propylene-based matrix and a dispersed ethylene-a-olefin copolymer.
  • the propylene- based matrix typically forms the continuous phase in the heterophasic propylene copolymer.
  • the amounts of the propylene-based matrix and the dispersed ethylene-a- olefin copolymer may be determined by 3 C-NMR, as well known in the art.
  • the propylene-based matrix consists of a propylene homopolymer and/or a propylene- a-olefin copolymer consisting of at least 95 wt% of propylene and up to 5 wt% of a- olefin, for example ethylene, based on the total weight of the propylene-based matrix.
  • the a-olefin in the propylene- a-olefin copolymer is selected from the group of a-olefins having 2 or 4 to 10 carbon atoms, for example ethylene, 1 -butene, 1 - pentene, 4-methyl-1 -pentene, 1 -hexen, 1 -heptene or 1 -octene, and is preferably ethylene.
  • the propylene-based matrix consists of a propylene homopolymer.
  • the fact that the propylene-based matrix consists of a propylene homopolymer is advantageous in that a higher stiffness is obtained compared to the case where the propylene-based matrix is a propylene-a-olefin copolymer.
  • MFI PP may be for example at least 0.1 dg/min, at least 0.2 dg/min, at least 0.3 dg/min, at least 0.5 dg/min, at least 1 dg/min, at least 1 .5 dg/min, and/or for example at most 50 dg/min, at most 40 dg/min, at most 30 dg/min, at most 25 dg/min, at most 20 dg/min, measured according to IS01 133 (2.16 kg/230 °C).
  • the MFI PP may be in the range of for example 0.1 to 50 dg/min, for example from 0.2 to 40 dg/min, for example 0.3 to 30 dg/min, for example 0.5 to 25 dg/min, for example from 1 to 20 dg/min, for example from 1 .5 to 10 dg/min, measured according to IS01 133 (2.16 kg/230 °C).
  • the propylene-based matrix is present in an amount of 65 to 85 wt%.
  • the propylene-based matrix is present in an amount of at least 70 wt% and/or at most 80 wt% or at most 78 wt%, based on the total heterophasic propylene copolymer.
  • the propylene-based matrix is preferably semi-crystalline, that is it is not 1 00% amorphous, nor is it 1 00% crystalline.
  • the propylene-based matrix is at least 40% crystalline, for example at least 50%, for example at least 60% crystalline and/or for example at most 80% crystalline, for example at most 70% crystalline.
  • the propylene-based matrix has a crystallinity of 60 to 70%.
  • the degree of crystallinity of the propylene-based matrix is measured using differential scanning calorimetry (DSC) according to IS01 1 357- 1 and IS01 1 357- 3 of 1 997, using a scan rate of l OOmin, a sample of 5mg and the second heating curve using as a theoretical standard for a 1 00% crystalline material 207.1 J/g.
  • DSC differential scanning calorimetry
  • the heterophasic propylene copolymer also comprises a dispersed ethylene-a-olefin copolymer.
  • the dispersed ethylene-a-olefin copolymer is also referred to herein as the 'dispersed phase'.
  • the dispersed phase is embedded in the heterophasic propylene copolymer in a discontinuous form.
  • the particle size of the dispersed phase is typically in the range of 0.05 to 2.0 microns, as may be determined by transmission electron microscopy (TEM).
  • TEM transmission electron microscopy
  • the amount of the dispersed ethylene-a-olefin copolymer in the heterophasic propylene copolymer may herein be sometimes referred as RC.
  • the amount of ethylene in the ethylene-a-olefin copolymer is at least 40 wt%, for example at least 45 wt% or at least 50 wt%, and/or at most 60 wt% or at most 55 wt%.
  • heterophasic propylene copolymer may herein be sometimes referred as RCC2.
  • the a-olefin in the ethylene-a-olefin copolymer is preferably chosen from the group of a-olefins having 3 to 8 carbon atoms. Examples of suitable a-olefins having 3 to 8 carbon atoms include but are not limited to propylene, 1 -butene, 1 -pentene, 4-methyl- 1 -pentene, 1 -hexen, 1 -heptene and 1 -octene.
  • the ⁇ -olefin in the ethylene-a-olefin copolymer is chosen from the group of a-olefins having 3 to 4 carbon atoms and any mixture thereof, more preferably the ⁇ -olefin is propylene, in which case the ethylene-a-olefin copolymer is ethylene-propylene copolymer.
  • MFI E PR may be for example at least 0.001 dg/min, at least 0.01 dg/min, at least 0.1 dg/min, at least 0.3 dg/min, at least 0.7 dg/min, at least 1 dg/min, and/or for example at most 30 dg/min, at most 20 dg/min, at most 1 5 dg/min at most 1 0 dg/min, at most 5 dg/min or at most 3 dg/min.
  • the MFI E PR may be in the range for example from 0.001 to 30 dg/min, for example from 0.01 to 20 dg/min, for example 0.1 to 15 dg/min, for example 0.3 to 10 dg/min, for example from 0.7 to 5 dg/min, for example from 1 to 3 dg/min.
  • MFI E PR is calculated taking into account the MFI of the propylene-based matrix (MFI PP ) measured according to IS01 133 (2.16 kg/230 Q C), the MFI of the heterophasic propylene copolymer (MFIheterophasic) measured according to IS01 133 (2.16 kg/230 Q C) and the amount of the propylene-based matrix in the heterophasic propylene copolymer (matrix content) and the amount of the dispersed phase in the heterophasic propylene copolymer (rubber content (RC)) according to the following formula:
  • the dispersed ethylene-a-olefin copolymer is present in an amount of 35 to 15 wt%.
  • the dispersed ethylene-a-olefin copolymer is present in an amount of at least 20 wt% and/or at most 30 wt% based on the total heterophasic propylene copolymer.
  • the sum of the total weight of the propylene-based matrix and the total weight of the dispersed ethylene-a-olefin copolymer is 100 wt% of the heterophasic propylene copolymer.
  • the heterophasic propylene copolymer has a fraction soluble in p-xylene at 25 Q C (CXS) measured according to ISO 16152:2005 of 35 to 20 wt%. More preferably, the heterophasic propylene copolymer has CXS of at least 22 wt% and/or at most 30 wt%.
  • TC2 (sometimes referred as TC2) is in the range of 15 to 35 wt% based on the heterophasic propylene copolymer.
  • the MFI of the heterophasic propylene copolymer may be for example at least 0.1 dg/min, at least 0.2 dg/min, at least 0.3 dg/min, at least 0.5 dg/min, at least 1 dg/min at least 1 .5 dg/min, at least 5 dg/min or at least 10 dg/min, and/or for example at most 100 dg/min, at most 50 dg/min, at most 40 dg/min, at most 30 dg/min, at most 25 dg/min, at most 20 dg/min or at most 10 dg/min, measured according to IS01 133 (2.16 kg/230 °C).
  • the MFI of the heterophasic propylene copolymer may be in the range of for example 0.1 to 50 dg/min, for example from 0.2 to 40 dg/min, for example 0.3 to 30 dg/min, for example 0.5 to 25 dg/min, for example from 1 to 20 dg/min, for example from 1 .5 to 10 dg/min, measured according to IS01 133 (2.16 kg/230 ⁇ €).
  • the MFI of the heterophasic propylene copolymer may be in the range of 10-100 dg/min, measured according to IS01 133 (2.16 kg/230 ⁇ €). Such a range of MFI is suitable for injection moulding.
  • MFI PP propylene-based matrix
  • MFI EPR dispersed ethylene-a-olefin elastomer
  • the MFIheterophasic is the original MFI value of the heterophasic propylene copolymer.
  • the heterophasic propylene copolymer is subjected to vis-breaking or shifting by melt-mixing with a peroxide, the
  • MFIheterophasic is the value of the heterophasic propylene copolymer after such vis- breaking or shifting.
  • the a-olefin in the propylene- a-olefin copolymer is selected from the group of a-olefins having 2 or 4 to10 carbon atoms and
  • the ⁇ -olefin in the ethylene-a-olefin copolymer is selected from the group of a-olefins having 3 to 8 carbon atoms.
  • the particulate material may be in the form of, for example, powders, flakes, platelets, fibers, whiskers, aggregates, agglomerates and mixtures of these.
  • the particulate material is talc.
  • Talc is a relatively abundant, inexpensive, highly hydrophobic and generally unreactive mineral. It can be categorized as a hydrated magnesium silicate and its main components can be represented by, inter alia, one or more of the formulas
  • the particulate material is an untreated talc having an average particle diameter d50 of 0.5 to 5 ⁇ .
  • An untreated talc is herein understood to mean that the talc is not coated by a surface modifier, such as silanes, amines, glycols, stearates, sorbates and titanates.
  • a treated talc as opposed to an untreated talc is also commonly referred as surface-modified talc, surface-treated talc or surface coated talc.
  • Exemplary suitable particles for use in the invention are talc commercially available from Hansheng and AH5000.
  • An example of the talc from Hansheng has d50 of 2.75 ⁇ .
  • AH5000 has d50 of 1 .1 ⁇ .
  • the amount of the particulate material is from 0.01 to 1 wt% of the total composition, for example 0.05 to 0.5 wt%.
  • composition according to the invention may optionally comprise at least one further component such as additives.
  • the amount of the optional component is typically 0 to 30 wt% of the total of the composition.
  • the optional components are used to the extent that they do not interfere with obtaining the desired properties of the light diffusion article.
  • the additives may include stabilisers, e.g. heat stabilisers, anti-oxidants, UV stabilizers; colorants, like pigments and dyes; clarifiers; surface tension modifiers; lubricants;
  • stabilisers e.g. heat stabilisers, anti-oxidants, UV stabilizers; colorants, like pigments and dyes; clarifiers; surface tension modifiers; lubricants;
  • flame-retardants flame-retardants; mould-release agents; flow improving agents; plasticizers; anti-static agents; external elastomeric impact modifiers; blowing agents; inorganic fillers and reinforcing agents; and/or components that enhance interfacial bonding between polymer and filler, such as a maleated polypropylene.
  • the skilled person can readily select any suitable combination of additives and additive amounts without undue experimentation.
  • the amount of the additives depends on their type and function and typically is of from 0 to about 30 wt%.
  • the amount of the additives may e.g. be from about 1 to about 20 wt%; from about 2 to about 10 wt% or of from 3 to about 5 wt% based on the total composition.
  • composition comprising the propylene-based polymer, the particulate material and the optional components should add up to 100% by weight of the total composition.
  • the total of the propylene-based polymer and the particulate material is at least 70 wt%, at least 80 wt%, at least 90 wt%, at least 95 wt%, at least 97 wt%, at least 98 wt%, at least 99 wt%, at least 99.5 wt%, at least 99.9 wt% or 100 wt% of the total composition.
  • the composition of the invention may be obtained by a process comprising melt-mixing (A) the heterophasic propylene copolymer, (B) the particulate material and (C) the optional component by using any suitable means. Accordingly, the invention further relates to a process for the preparation of the composition according to the invention comprising melt mixing (A) and (B) and optionally (C).
  • the composition of the invention is made in a form that allows easy processing into a shaped article in a subsequent step, like in pellet or granular form.
  • the composition can be a mixture of different particles or pellets; like a blend of the heterophasic propylene copolymer and a masterbatch of additives.
  • the composition of the invention is in pellet or granular form as obtained by mixing all components in an apparatus like an extruder; the advantage being a composition with homogeneous and well-defined concentrations of the additives.
  • melt-mixing is meant that the components (B) and optionally (C) are mixed with the heterophasic propylene copolymer at a temperature that exceeds the melting point of the heterophasic propylene copolymer.
  • Melt-mixing may be done using techniques known to the skilled person, for example in an extruder. Generally, in the process of the invention, melt-mixing is performed at a temperature in the range from 2-300 °C.
  • Suitable conditions for melt-mixing such as temperature, pressure, amount of shear, screw speed and screw design when an extruder is used are known to the skilled person.
  • a conventional extruder such as a twin-screw extruder may be used.
  • the temperature can vary through the different zones of the extruder as required.
  • the temperature may vary from 100°C in the feed zone to 300 °C at the die.
  • the temperature in the extruder varies from 200 to 265 ' ⁇ ; lower temperatures may impede reactions between the peroxide and an optional co-agent, for example polyfunctional monomers such as BDDMA and, as a consequence, compositions with the desired melt flow index may not be obtained; too high temperatures may induce undesired degradation processes, which may for example result in compositions having poor mechanical properties.
  • the screw speed of the extruder may be varied as needed. Typical screw speed is in the range from about 100rpm to about 400rpm.
  • the invention further provides a process for the preparation of the light diffusion article according to the invention, comprising melt mixing the heterophasic propylene copolymer and the particulate material to obtain the composition and forming the composition into the light diffusion article.
  • the invention further relates to use of a composition
  • a composition comprising (A) a heterophasic propylene copolymer and (B) a particulate material for making a light diffusing article, wherein the amount of the particulate material is from 0.01 to 1 wt% of the total composition,
  • heterophasic propylene copolymer consists of
  • propylene-based matrix consists of a propylene homopolymer and/or a copolymer of propylene and ethylene or a-olefin consisting of at least 95 wt% of propylene and at most 5 wt% of a-olefin, based on the total weight of the propylene- based matrix and
  • propylene-based matrix is present in an amount of 65 to 85 wt% based on the total heterophasic propylene copolymer and
  • the amount of ethylene in the dispersed ethylene-a-olefin copolymer is at least 40 wt%
  • dispersed ethylene-a-olefin copolymer is present in an amount of 35 to 15 wt% based on the total heterophasic propylene copolymer and
  • a sheet having a thickness of 1 mm made of the composition has a degree of light dispersion DLD T and a haze H T and
  • a sheet having a thickness of 1 mm made of the heterophasic propylene copolymer has a degree of light dispersion DLD R and a haze H R ,
  • the invention further relates to use of the light diffusing article according to the invention for diffusing light.
  • the invention further relates to a lighting device comprising a housing containing a light source and the light diffusing article according to the invention, said article being positioned relative to the light source such that it diffuses at least part of the light coming from said light source.
  • the light source is a LED lamp.
  • the product/composition consisting of these components may be advantageous in that it offers a simpler, more economical process for the preparation of the product/composition.
  • a description on a process comprising certain steps also discloses a process consisting of these steps. The process consisting of these steps may be advantageous in that it offers a simpler, more economical process.
  • Polymer 1 , 2 and 3 are a heterophasic propylene copolymer comprising a matrix phase of a propylene homopolymer and a dispersed phase of propylene-ethylene copolymer.
  • MFI is measured according to ISO 1 133, 230 ⁇ €, 2.16 kg.
  • talc 1 Hansheng talc: untreated talc having d50 of 2.75 ⁇
  • talc 2 AH5000 talc: untreated talc having d50 of 1 .1 ⁇
  • the heterophasic propylene copolymer (and antioxidants and acid scavenger of 500 to 1000 ppm) was pre-blended with talc. Subsequently the pre-blended powder was extruded using a twin extruder. The pellets were dried at 100 °C for 2 h and injection molded using FANUC injection molding machine (S-2000i) to prepare the parts for test.
  • S-2000i FANUC injection molding machine
  • the flexural modulus was measured according to ISO 178 (test geometry: 3.2 mm thickness according to IS037/2, parallel orientation).
  • the heat deflection temperature (HDT) was measured according to ISO 75 (load at 0.45 MPa).
  • compositions and test results are shown in Tables 1 -5.
  • the addition of either types of talc led to a large increase in DLD with little change in the haze.
  • the composition of the light diffusing article according to the invention also increases the HDT, which is beneficial as the light diffusing article needs to be able to withstand the heat from the lighting source.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

L'invention concerne un article diffusant la lumière comprenant une composition comprenant (A) un copolymère de propylène hétérophasique et (B) une matière particulaire, la quantité de matière particulaire étant de 0,01 à 1 % en poids de la composition totale, le copolymère de propylène hétérophasique comportant (a) une matrice à base de propylène, la matrice à base de propylène étant constituée d'un homopolymère de propylène et/ou d'un copolymère de propylène et d'éthylène ou d'une alpha-oléfine constituée d'au moins 95 % en poids de propylène et d'au plus 5 % en poids d'une alpha-oléfine, en fonction du poids total de la matrice à base de propylène et la matrice à base de propylène étant présente en une quantité de 65 à 85 % en fonction du copolymère de propylène hétérophasique total et (b) un copolymère d'éthylène-alpha-oléfine dispersé, la quantité d'éthylène dans le copolymère d'éthylène-alpha-oléfine dispersé étant d'au moins 40 % en poids, le copolymère d'éthylène-alpha-oléfine dispersé étant présent en une quantité de 35 à 15 % en poids en fonction du copolymère de propylène hétérophasique total et la somme de la quantité totale de matrice à base de propylène et de la quantité totale du copolymère d'éthylène-alpha-oléfine dispersé dans le copolymère de propylène hétérophasique étant de 100 % en poids du copolymère de propylène hétérophasique, une feuille d'une épaisseur de 1 mm constituée de la composition ayant un degré de dispersion de la lumière DLDT et un voile HT et une feuille d'une épaisseur de 1 mm constituée du copolymère de propylène hétérophasique ayant un degré de dispersion de lumière DLDR et un voile HR, (HT-HR)/HR valant au plus 2 % et (DLDT-DLDR)/DLDR valant au moins 10 %, de préférence au moins 100 %, de préférence encore au moins 400 %.
PCT/EP2017/068634 2016-07-29 2017-07-24 Article diffusant la lumière Ceased WO2018019764A1 (fr)

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