Basf Se Corporation

Ciba Corporation

Unitika Ltd.

Mamiko Takesue

Junichi Tanabe

Clemens Auschra

Masaki Ohwa

Takashi Deno

Jan Sültemeyer

Carsten Schellenberg

A black colorant mixture comprising a bis-oxodihydro-indolylene-benzodifuranone colorant and a perylene colorant is disclosed which provides high blackness and NIR transparency combined with low conductivity for organic coating films used in display devices. Especially, a black matrix for color filter applications and black column spacers are described used in LCD devices. Further, the black colorant mixture can be used in bezels of a display device equipped with a touch sensor.

Black colorant mixture

The invention relates to a color filter composition comprising a) a photoresist binder, b) a transparent pigment, c) optionally a solvent and/or optionally a photoinitiator or a photolatent catalyst, d) a dispersant which is a polymer or copolymer obtainable by a process comprising the steps of a1) polymerizing in a first step one or more ethylenically unsaturated monomers in the presence of at least one nitroxylether having the structural element wherein X represents a group having at least one carbon atom and is such that the free radical X derived from X is capable of initiating polymerization; or a2) polymerizing in a first step one or more ethylenically unsaturated monomers in the presence of at least one stable free nitroxyl radical and a free radical initiator; wherein at least one monomer used in the steps a1) or a2) is a C-Calkyl or hydroxy C-Calkyl ester of acrylic or methacrylic acid; and a second step b) comprising the modification of the polymer or copolymer prepared under a1) or a2) by a transesterification reaction, an amidation, hydrolysis or anhydride modification or a combination thereof, and optionally in addition by quaternization. 

Color filter composition

The present invention pertains to salt modified copolymers wherein one of the monomer units contains a quaternized N-atom structure with a polar substituent. The invention further relates to the use of said copolymers as dispersant especially for color filters. The copolymer is made by controlled polymerization or by conventional polymerization and comprises at least one monomer (MA) selected from unsaturated monomers out of the group of acrylates, methacrylates, acrylamides, methacrylamides, styrenic monomers, at least one monomer (MB) selected from unsaturated monomers out of the group of acrylates, methacrylates, acrylamides, methacrylamides, styrenic monomers wherein the monomer MB has a quaternized N-atom structure with a polar substituent selected from polyether, polyamine, nitrile, amide, imine, imide, ester, ketone, nitrile, aldehyde, diketone, ketoester, ketoamide, carbonate, carbamate, carbamide, sulfoxide, sulfone, carboxylic acid, sulfonic acid, phosphoric acid groups; or carboxylic acid anion, sulfonic acid anion or phosphoric acid anion groups which is formed as betaine structure r denotes the total number of monomers MA within the structural element (MA) and r is &#x3e;5, preferred 10-1000, most preferred 10-500; s denotes the total number of monomers MB within the structural element (MB) and s is &#x3e;1, preferred 2-100, most preferred 2-50.

Pigment dispersants with modified copolymers

Growing community of inventors

Osaka, Japan

Mamiko Takesue