Top 100 Key Players companies in Polystyrene by Most Patent Citation in the Japan in 2021 – Discovery

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The Polystyrene top 100 is Discovery PatSnap’ annual ranking of the top 100 Most Patent Citation Polystyrene Key Players in the Japan. Discovery has identified the top key players, startups & unicorns, fast-growings, news entrants in 2021, ranking from differnt perspectives, including patent filing intensity, academic research capability, news media heat. The company list is generated from various data types.

Polystyrene (PS) /ˌpɒliˈstaɪriːn/ is a synthetic aromatic hydrocarbon polymer made from the monomer styrene. Polystyrene can be solid or foamed. General-purpose polystyrene is clear, hard, and rather brittle. It is an inexpensive resin per unit weight. It is a rather poor barrier to oxygen and water vapour and has a relatively low melting point. Polystyrene is one of the most widely used plastics, the scale of its production being several million tonnes per year. Polystyrene can be naturally transparent, but can be coloured with colourants. Uses include protective packaging (such as packing peanuts and CD and DVD cases), containers, lids, bottles, trays, tumblers, disposable cutlery and in the making of models.

1	Asahi Kasei Corp.	Tokyo, Japan	Chemical engineering,Petrochemical,Fertilizer, ...[+2]	patent citation: 3,823
2	JSR Corp.	Tokyo, Japan	Synthetic rubber,Natural rubber,Elastomer, ...[+2]	patent citation: 3,599
3	Sumitomo Chemical Co., Ltd.	Tokyo, Japan	Petrochemical,Agriculture,Pesticide, ...[+2]	patent citation: 3,340
4	Bridgestone Corp.	Tokyo, Japan	Automotive engineering,sports equipment,Natural rubber, ...[+2]	patent citation: 2,396
5	Sekisui Kasei Co., Ltd.	Osaka, Japan	Civil engineering,Chemical engineering,Health care, ...[+2]	patent citation: 2,139
6	Idemitsu Kosan Co., Ltd.	Tokyo, Japan	Petrochemical,Lubricant,Petroleum, ...[+2]	patent citation: 1,832
7	Panasonic Holdings Corp.	Osaka, Japan	Semiconductor,Industrial engineering,Electronics, ...[+2]	patent citation: 1,592
8	Matsushita Electronics Corp.	Osaka, Japan	Electronics,Computer hardware,DVD player, ...[+2]	patent citation: 1,592
9	Mitsui Chemicals, Inc.	Tokyo, Japan	Petrochemical,Chemical engineering,Polypropylene, ...[+2]	patent citation: 1,560
10	Kaneka Corp.	Tokyo, Japan	Synthetic rubber,Chemical engineering,Polyvinyl chloride, ...[+2]	patent citation: 1,508
11	Toray Industries, Inc.	Tokyo, Japan	Fiber,Textile,Textile (markup language), ...[+2]	patent citation: 1,281
12	Sekisui Chemical Co., Ltd.	Osaka, Japan	Synthetic rubber,Industrial engineering,Polyvinyl chloride, ...[+2]	patent citation: 1,280
13	DIC Corp.	Tokyo, Japan	Pigment,Chemical engineering,Synthetic resin, ...[+2]	patent citation: 1,145
14	DIC Corporation		Pigment,Polymer,Epoxy, ...[+2]	patent citation: 1,145
15	Shin-Etsu Chemical Co., Ltd.	Tokyo, Japan	Silicone,Semiconductor,Chemical engineering, ...[+2]	patent citation: 1,086
16	Nippon Zeon Co., Ltd.	Tokyo, Japan	Chemical engineering,Solid-state battery,Supercapacitor, ...[+1]	patent citation: 1,033
17	Canon, Inc.	Tokyo, Japan	Computer hardware,Software,Computer vision, ...[+2]	patent citation: 1,012
18	Daicel Corp.	Chiba, Japan	Airbag,Chemical engineering,Cellulose acetate, ...[+2]	patent citation: 971
19	Toyobo Co., Ltd.	Osaka, Japan	Chemical engineering,Synthetic rubber,Membrane, ...[+2]	patent citation: 931
20	Ricoh Co., Ltd.	Tokyo, Japan	Digital media,Data visualization,Thermal paper, ...[+2]	patent citation: 896
21	Showa Denko Materials Co., Ltd.	Tokyo, Japan	Semiconductor,Carbon product,Efficient energy use, ...[+2]	patent citation: 884
22	Kuraray Co., Ltd.	Tokyo, Japan	Synthetic rubber,Isoprene,Vinyl acetate, ...[+2]	patent citation: 882
23	Teijin Ltd.	Tokyo, Japan	Synthetic rubber,Chemical engineering,Polycarbonate, ...[+2]	patent citation: 839
24	FUJIFILM Corp.	Tokyo, Japan	Photography,Medical imaging,Computer hardware, ...[+2]	patent citation: 822
25	Sony Group Corp.	Tokyo, Japan	Computer hardware,Software,Music, ...[+2]	patent citation: 795
26	Idemitsu Petrochemical Co., Ltd.	Tokyo, Japan	Petrochemical,Chemical engineering,Butene, ...[+2]	patent citation: 776
27	Dai Nippon Printing Co., Ltd.	Tokyo, Japan	Electronics,Publishing,Publication, ...[+2]	patent citation: 731
28	Dainippon Printing Co. Ltd.	Japan		patent citation: 731
29	Asahi Kasei Chemicals Corp.	Tokyo, Japan	Chemical engineering,Ion-exchange membranes,Membrane, ...[+2]	patent citation: 705
30	Mitsubishi Gas Chemical Co., Inc.	Tokyo, Japan	Petroleum industry,Petrochemical,Engineering plastic, ...[+2]	patent citation: 667
31	Tosoh Corp.	Tokyo, Japan	Petrochemical,Chemical engineering,Immunoprotein, ...[+2]	patent citation: 655
32	Hitachi Ltd.	Tokyo, Japan	Elevator,Electrical equipment,Electric motor, ...[+2]	patent citation: 633
33	Fuji Seal International, Inc.	Osaka, Japan	Barcode,Sleeve,Microservices, ...[+2]	patent citation: 597
34	Sumitomo Bakelite Co., Ltd.	Tokyo, Japan	Semiconductor,Materials science,Bakelite, ...[+2]	patent citation: 589
35	JSP Corp.	Tokyo, Japan	Polystyrene,Bead,Polyethylene, ...[+2]	patent citation: 578
36	TOSHIBA Corp.	Tokyo, Japan	Semiconductor,Computer hardware,Electronics, ...[+2]	patent citation: 574
37	Seiko Epson Corp.	Nagano, Japan	Wearable technology,Projector,Electronics, ...[+2]	patent citation: 543
38	Wako Pure Chemical Industries Ltd	Osaka, Japan	Medicine,Diagnostic Reagent,Laboratory chemicals, ...[+2]	patent citation: 529
39	Fujitsu Ltd.	Tokyo, Japan	Cloud computing,Enterprise software,Information technology management, ...[+2]	patent citation: 522
40	Furukawa Electric Co., Ltd.	Tokyo, Japan	Optical fiber,Renewable energy,Optoelectronics, ...[+2]	patent citation: 482
41	Konica Minolta, Inc.	Tokyo, Japan	Medical imaging,Attractiveness,Product group, ...[+2]	patent citation: 454
42	A&D Holon Holdings Co., Ltd.	Tokyo, Japan	Health care,Electronics,Robotics, ...[+2]	patent citation: 425
43	Showa Denko K.K.	Chiba, Japan	Graphite,Materials science,Nanomaterials, ...[+2]	patent citation: 422
44	Mitsubishi Plastics, Inc.	Tokyo, Japan	Bottle,Chemical engineering,Plastic film, ...[+2]	patent citation: 419
45	GE Plastics Japan Ltd.	Tokyo, Japan	Chemical engineering,Plastomer,Thermoplastic elastomer, ...[+2]	patent citation: 387
46	Toppan, Inc.	Tokyo, Japan	Publishing,Semiconductor,Electronics, ...[+2]	patent citation: 373
47	Nitto Denko Corp.	Osaka, Japan	Semiconductor,Product design,Adhesive, ...[+2]	patent citation: 370
48	Mitsubishi Engineering-Plastics Corp.	Tokyo, Japan	Polycarbonate,Polybutylene terephthalate,Chemical engineering, ...[+2]	patent citation: 368
49	Central Glass Co., Ltd.	Tokyo, Japan	Glazing,Fine chemical,Chemical engineering, ...[+2]	patent citation: 358
50	SANYO Electric Co., Ltd.	Osaka, Japan	Semiconductor,Computer hardware,Software, ...[+2]	patent citation: 357
51	UBE Corp.	Tokyo, Japan	Synthetic rubber,Chemical engineering,Coal mining, ...[+2]	patent citation: 348
52	Evonik Degussa Japan Co., Ltd.	Tokyo, Japan		patent citation: 311
53	Mitsubishi Electric Engineering Co., Ltd.	Tokyo, Japan		patent citation: 271
54	Gunze Ltd.	Osaka, Japan	Textile,Suture (anatomy),Semiconductor, ...[+2]	patent citation: 266
55	Fuji Seal, Inc.	Tokyo, Japan	Automation,Mechanical engineering,Manufacturing engineering, ...[+1]	patent citation: 265
56	Nippon Kayaku Co., Ltd.	Tokyo, Japan	Biosimilar,Chemical engineering,Industrial engineering, ...[+2]	patent citation: 257
57	NIPPON STEEL Stainless Steel Corp.	Tokyo, Japan	Mill,Metal,Mining engineering, ...[+1]	patent citation: 254
58	Kao Corp.	Tokyo, Japan	Cosmetics,Health care,Hair conditioner, ...[+2]	patent citation: 245
59	Unitika Ltd.	Osaka, Japan	Fiber,Textile (markup language),Polymer, ...[+2]	patent citation: 242
60	Fujifilm Business Innovation Corp.	Chiba, Japan	Electronics,Inkjet printing,Vertical-cavity surface-emitting laser, ...[+2]	patent citation: 242
61	Sankyo Co., Ltd.	Tokyo, Japan	Ball bearing,Manufacturing engineering,Glatiramer acetate, ...[+2]	patent citation: 236
62	AGC	Tokyo, Japan	Fluorine,Glazing,Chemical engineering, ...[+2]	patent citation: 235
63	Asahi Fiber Glass Co., Ltd.	Tokyo, Japan	Glass wool,Thermal insulation,Fiber, ...[+2]	patent citation: 235
64	Nichia Corp.	Tokushima, Japan	Laser diode,Semiconductor,LED lamp, ...[+2]	patent citation: 231
65	Nippon Micrometal Corp.	Saitama, Japan	Solder ball,Printed electronics,Metal	patent citation: 231
66	Murata Manufacturing Co. Ltd.	Kyoto, Japan	Semiconductor,Electronics,Electronic component, ...[+2]	patent citation: 222
67	Sumitomo Electric Industries Ltd.	Osaka, Japan	Electronics,Optical fiber,Optical fiber cable, ...[+2]	patent citation: 220
68	Sumitomo Electric	Osaka, Japan	Optical fiber,Electronics,Optical fiber cable	patent citation: 220
69	Mitsubishi Kogyo KK	Japan		patent citation: 219
70	Oji Holdings Corp.	Tokyo, Japan	Containerboard,Paperboard,Thermal paper, ...[+2]	patent citation: 216
71	Terumo Corp.	Tokyo, Japan	Health care,Blood management,Syringe, ...[+2]	patent citation: 212
72	Kanebo Ltd.	Tokyo, Japan	Textile,Cosmetics,Food products, ...[+2]	patent citation: 208
73	Hitachi Cable Ltd.	Tokyo, Japan	Electronics,Metal,Optical fiber, ...[+2]	patent citation: 204
74	Sharp Corp.	Osaka, Japan	Computer hardware,Electronics,Telecommunications, ...[+2]	patent citation: 203
75	Nippon Shokubai Co., Ltd.	Tokyo, Japan	Polymer,Acrylic acid,Chemical engineering, ...[+2]	patent citation: 200
76	Asahi Chemical Industry Co., Ltd.	Japan	Chemical industry,Chemical engineering	patent citation: 196
77	Nippon Telegraph & Telephone Corp.	Tokyo, Japan	Telecommunications,Cloud database,Data center, ...[+2]	patent citation: 190
78	Chisso Corp.	Tokyo, Japan	Petrochemical,Liquid crystal,Chemical engineering, ...[+2]	patent citation: 186
79	Toso Sangyo Co. Ltd.	Japan		patent citation: 184
80	Toyota Motor Corp.	Aichi, Japan	Sport utility vehicle,Mobile device,Public transport, ...[+2]	patent citation: 183
81	Polyplastics Co., Ltd.	Tokyo, Japan	Engineering plastic,Plastics engineering,Polymer, ...[+2]	patent citation: 181
82	Mitsubishi Paper Mills Ltd.	Tokyo, Japan	Paperboard,Thermal paper,3D printing, ...[+2]	patent citation: 179
83	Funai Electric Co., Ltd.	Osaka, Japan	Electronics,Computer hardware,Blu-ray disc, ...[+2]	patent citation: 176
84	Nisshinbo Holdings, Inc.	Tokyo, Japan	Yarn,Fiber,Brake pad, ...[+2]	patent citation: 169
85	Nisshinbo Textile Inc.	Tokyo, Japan	Yarn,Fiber,Textile (markup language), ...[+1]	patent citation: 169
86	Nagoya Oilchemical Co. Ltd.	Japan		patent citation: 162
87	Honda Motor Co., Ltd.	Tokyo, Japan	Automotive engineering,Manufacturing engineering,Sport utility vehicle, ...[+2]	patent citation: 161
88	Toyota Central R&D Labs, Inc.	Aichi, Japan	Semiconductor,Power semiconductor device,System on a chip, ...[+2]	patent citation: 161
89	Tokuyama Corp.	Tokyo, Japan	Cement,Chemical engineering,Fumed silica, ...[+2]	patent citation: 159
90	Nissan Chemical Corp.	Tokyo, Japan	Pesticide,Meiji period,Fertilizer, ...[+2]	patent citation: 156
91	Sanyo Chemical Industries, Ltd.	Kyoto, Japan	Chemical engineering,Polyurethane,Superabsorbent polymer, ...[+2]	patent citation: 150
92	Saint-Gobain TM KK	Tokyo, Japan	Ceramic materials,Construction engineering,Materials science, ...[+2]	patent citation: 148
93	TDK Corp.	Tokyo, Japan	Electronic component,Ceramic capacitor,Electronics, ...[+2]	patent citation: 147
94	Tomoegawa Co., Ltd.	Tokyo, Japan	Materials processing,Industrial engineering,Nonwoven fabric, ...[+2]	patent citation: 146
95	PMC KK	Tokyo, Japan	Web design	patent citation: 145
96	Toyo Ink SC Holdings Co., Ltd.	Hokkaido, Japan	Pigment,Manufacturing engineering,Coating, ...[+2]	patent citation: 144
97	Mita Industrial Co., Ltd.	Osaka, Japan	Computer hardware,Electronics,Monochrome	patent citation: 142
98	Dow Corning Toray Co., Ltd.	Tokyo, Japan	Synthetic rubber	patent citation: 138
99	Toyo Tire Corp.	Hyogo, Japan	Automotive engineering,Radial tire,Rubber material, ...[+2]	patent citation: 137
100	LINTEC Corp.	Tokyo, Japan	Adhesive materials,Industrial engineering,Pressure sensitive, ...[+2]	patent citation: 136