# US 11,111,373 B2 · Polymethacrylate composition and optical device made therefrom, and display apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,111,373 B2 - Document ID: US11111373B2 - Status: Granted - Kind: B2 - Application number: 16/699,094 - Filed: 2019-11-28 - Published: 2020-06-11 - Granted: 2021-09-07 - Earliest claimed: 2018-12-05 - Assignees: Chi Mei Corporation - Applicants: Chi Mei Corporation - Inventors: Shang-Ju Hsieh - Web page: https://patentgrep.com/patent/US11111373B2 ## CPC - C08L 33/12: Homopolymers or copolymers of methyl methacrylate - C08F 212/08: Styrene - C08F 220/14: Methyl esters {, e.g. methyl (meth)acrylate} - G02B 1/04: made of organic materials, e.g. plastics (G02B1/08 takes precedence) - G02B 1/041: {Lenses} - G02B 6/0065: {Manufacturing aspects; Material aspects} - B29D 11/00326: {having particular surface properties, e.g. a micropattern} - B29D 11/00788: {Producing optical films} - B29K 2833/12: Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate - C08L 2201/08: Stabilised against heat, light or radiation or oxydation - C08L 2201/10: Transparent films; Clear coatings; Transparent materials - C08L 2203/16: used for films - G02B 5/0215: {the surface having a regular structure} - G02B 5/0278: {used in transmission} - G02B 6/0036: {2-D arrangement of prisms, protrusions, indentations or roughened surfaces} - G02F 1/133526: {Lenses, e.g. microlenses or Fresnel lenses} - G02F 2202/022: polymeric - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00) - 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 - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS ## Abstract A polymethacrylate composition, an optical device made therefrom, and a display apparatus are provided. The polymethacrylate composition includes 50 to 85 parts by weight of methacrylate series polymer, 15 to 50 parts by weight of styrene series-maleic anhydride series copolymer, and an aromatic compound having a phosphite group. The methacrylate series polymer includes methacrylate series monomer unit and acrylate series monomer unit and has a weight average molecular weight (Mw) in a range between 20,000 and 200,000. The styrene series-maleic anhydride series copolymer includes 65 wt %-85 wt % of styrene series monomer unit, 15 wt %-35 wt % of maleic anhydride series monomer unit, and 0-20 wt % of second copolymerizable monomer unit. The content of the aromatic compound having a phosphite group in the polymethacrylate composition is 200 ppm-900 ppm. ## Claims ### Claim 1 A polymethacrylate composition, comprising: 50 to 85 parts by weight of methacrylate polymer, wherein the methacrylate polymer includes methacrylate monomer unit and acrylate monomer unit and has a weight average molecular weight in a range between 20,000 and 200,000; 15 to 50 parts by weight of styrene maleic anhydride copolymer; 200 ppm-900 ppm of aromatic compound having a phosphite group; and 10,000 ppm-50,000 ppm of an UV absorber, wherein a flash point of the UV absorber is 240° C. or higher, wherein the total amount of the methacrylate polymer and the styrene maleic anhydride copolymer is 100 parts by weight, and the styrene maleic anhydride copolymer includes 65 wt %-85 wt % of styrene monomer unit, 15 wt %-35 wt % of maleic anhydride monomer unit, and 0-20 wt % of second copolymerizable monomer unit. ### Claim 2 (depends on 1) The polymethacrylate composition according to claim 1, wherein the methacrylate polymer includes 92 wt %-99 wt % of the methacrylate monomer unit, 1 wt %-8 wt % of the acrylate monomer unit, and 0-7 wt % of first copolymerizable monomer unit, and a weight average molecular weight (Mw) of the methacrylate polymer is between 50,000 and 150,000. ### Claim 3 (depends on 2) The polymethacrylate composition according to claim 2, wherein the first copolymerizable monomer unit is at least one selected from a group consisting of unsaturated carboxylic monomer unit, maleimide monomer unit, propenyl-containing compound monomer unit, vinyl-containing compound monomer unit and styrene monomer unit. ### Claim 4 (depends on 1) The polymethacrylate composition according to claim 1, wherein the ratio of the weight percentage of the styrene monomer unit to the weight percentage of the maleic anhydride s monomer unit in the styrene maleic anhydride copolymer is between 1 and 8.5. ### Claim 5 (depends on 1) The polymethacrylate composition according to claim 1, wherein a weight average molecular weight (Mw) of the styrene maleic anhydride copolymer is between 60,000 and 100,000. ### Claim 6 (depends on 1) The polymethacrylate composition according to claim 1, wherein the second copolymerizable monomer unit is selected from at least one of a group consisting of methyl methacrylate monomer unit, ethyl methacrylate monomer unit, propyl methacrylate monomer unit, n-butyl methacrylate monomer unit, amyl methacrylate monomer unit, cyclohexyl methacrylate monomer unit, heptyl methacrylate monomer unit, n-octyl methacrylate monomer unit, octadecyl methacrylate monomer unit, phenyl methacrylate monomer unit, benzyl methacrylate monomer unit, 2-ethylhexyl methacrylate monomer unit, methyl acrylate monomer unit, ethyl acrylate monomer unit, propyl acrylate monomer unit, butyl acrylate monomer unit, amyl acrylate monomer unit, n-hexyl acrylate monomer unit, cyclohexyl acrylate monomer unit, heptyl acrylate monomer unit, dodecyl acrylate monomer unit, phenyl acrylate monomer unit, benzyl acrylate monomer unit, 2-ethylhexyl acrylate monomer unit, and octadecyl acrylate monomer unit. ### Claim 7 (depends on 1) The polymethacrylate composition according to claim 1, further comprising an antioxidant and a content ratio of the antioxidant to the aromatic compound having a phosphite group is within 1.1-10. ### Claim 8 (depends on 1) The polymethacrylate composition according to claim 1, further comprising 500 ppm-2,000 ppm of an antioxidant. ### Claim 9 (depends on 1) The polymethacrylate composition according to claim 1, further comprising 500 ppm-2,000 ppm of a thermal stabilizer. ### Claim 10 (depends on 1) The polymethacrylate composition according to claim 1, wherein the UV absorber is selected from at least one of a group consisting of 2-(4,6-bis-(2,4-dimethylphenyl)-1,3,5-triazin-2-yl)-5-(octyloxy)phenol, 2,2′-methylenebis[6-(benzotriazol-2-yl)-4-tert-octylphenol], 2-(4,6-diphenyl-1,3,5-triazin-2-yl)-5-[(hexyl)oxy]-phenol, 2,2′,4,4′-tetrahydroxybenzophenone, 3-[(2-Cyano-3,3-diphenylacryloyl)oxy]-2,2-bis{[(2-cyano-3,3-diphenylacryloyl)oxy]methyl}propyl 2-cyano-3,3-diphenylacrylate, 2-(2H-benzo Triazol-2-yl)-6-dodecyl-4-methylphenol, and 2-(2′-hydroxy-3′,5′-dipentylphenyl)benzotriazole. ### Claim 11 (depends on 1) An optical device, being made from the polymethacrylate composition according to claim 1. ### Claim 12 (depends on 11) The optical device according to claim 11, wherein the optical device is at least one selected from the group consisting of an optical plate, an optical sheet, and an optical film. ### Claim 13 (depends on 11) A display apparatus, comprising: the optical device according to claim 11, wherein the display apparatus is at least one selected from the group consisting of a television, a digital camera, a digital photo frame, a mobile phone, a notebook personal computer, a mobile computer, a monitor used in a computer, a portable game console, a portable information terminal, an audio reproduction apparatus, a game console, and a car display. ### Claim 14 (depends on 1) The polymethacrylate composition according to claim 1, wherein a content ratio of the UV absorber to the aromatic compound having a phosphite group is within 10-300. ### Claim 15 (depends on 1) The polymethacrylate composition according to claim 1, wherein a content ratio of the UV absorber to the aromatic compound having a phosphite group is within 15-200. ### Claim 16 (depends on 1) The polymethacrylate composition according to claim 1, wherein a content ratio of the UV absorber to the aromatic compound having a phosphite group is within 20-180.