Chi Mei Corporation

Shang-Ju Hsieh

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.

Polymethacrylate composition and optical device made therefrom, and display apparatus

A resin composition for laser marking includes a resin and laser absorbers. The resin includes 40%&#x2dc;83% (methyl)acrylate-styrene based copolymers (A), greater than 0 to 45% (methyl)acrylate based copolymers (B) and 5&#x2dc;35% core-shell copolymers (C) by weight. The laser absorbers include 0.01&#x2dc;0.25 parts of carbon black (D) for each 100 parts by weight of the resin. The (methyl)acrylate-styrene based copolymer (A) includes 40&#x2dc;80% (methyl)acrylate-containing monomer units, 20% to 60% styrene series monomer units and 0% to 30% other-polymerizable monomer units by weight. The (methyl)acrylate based copolymers (B) includes 92&#x2dc;99% methacrylate-type monomer units, 1&#x2dc;8% acrylate series monomer units and 0&#x2dc;7% vinyl-group-containing polymerizable monomer units by weight and has a weight-average molecular weight ranging from 70,000 to 150,000. Each core-shell copolymers (C) has a core portion that includes butadiene monomer units and (methyl)acrylate-containing monomer units and a shell portion that comprises (methyl)acrylate-containing monomer units at least partially covering the core portion.

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Tainan, Taiwan

Shang-Ju Hsieh