Printing process

Details Printing process Printing process

1996-12-09

1999-10-26

McPherson, John A.

Radiation imagery chemistry: process, composition, or product th

Radiation modifying product or process of making

Screen other than for cathode-ray tube

427511, 427164, 427165, 4273855, 534769, 534792, G02B 520, B05D 302

Patent

active

059725443

DESCRIPTION:

BRIEF SUMMARY
This application is the national phase of international application PCT/GB95/01122 filed May 18, 1995 which designated the U.S.
This invention relates to processes for printing substrates, to a mixture of polymer precursor and dye, to a process for making optical filters, to optical filters and to novel dyes.
Published European Application No 546,856 proposes a process for making colour filters (for use e.g. in liquid crystal displays) which uses a photosensitive resin resist composition containing a dye which either has a photopolymerisable substituent or has a molecular weight in the range from 500 to 4000. The dye is said to be immcbilised in the resin matrix either by its high molecular weight, or by self-polymerisation or by co-polymerisation of the dye with the photosensitive resist resin.
Published European Patent Application No 531,106 proposes colour filters in which the light-filtering substance comprises the result of the reaction of a binder polymer with a reactive dye. The reactive groups in the binder polymer are hydroxy or amino groups, while the reactive dye is of cellulose-reactive type, containing either a vinylsulphone group (or a precursor thereof), or an electrophilic reactive group (e.g. a chlorine atom attached to a triazine ring), or a mixture of these types.
Published European Patent Application No. 564,237 proposes a process of making a colour filter using a photosetting resin precursor and a dyestuff which can uniformly colour the photocured resin.
U.S. Pat. No. 5,176,971 proposes a method of making a colour filter in which the filter picture elements (red, green and blue) are made of polyimide resin containing a dye.
U.S. Pat. No. 4,781,444 proposes a method of making a colour filter by electrodeposition of a coloured layer on a substrate. The coloured layer comprises a polymer having a dye chemically bonded to it. The dye used is a cellulose-reactive dye containing for example a vinyl sulphone group or an electrophilic reactive group (e.g. a chlorine atom attached to a triazine ring), as described above for European Patent Application 531,106.
U.S. Pat. No. 5,231,135 proposes a method of making a coloured polymer coating on a substrate, in which the coloured polymer is prepared by reaction of a colourant of formula R-[polymeric constituent-X].sub.n wherein R is an organic dyestuff radical and X is a reactive moiety (e.g. --OH, --NH.sub.2, or --SH) with a linking agent (e.g. a polyisocyanate or a melamine-formaldehyde resin), which in turn reacts with a polymer having reactive groups and links the colourant with the polymer. In an alternative embodiment, the colourant is reacted directly with the polymer, without a linking agent. The coloured polymers are said to be useful as coatings for automobiles.
According to a first aspect of the present invention, there is provided a process for preparing an optical filter comprising a coloured cross-linked polymeric coating on a transparent substrate, which comprises applying to the substrate, by a printing process, a mixture comprising one or more polymer precursor(s), and one or more dye(s) capable of forming a covalent bond with the polymeric precursor via a heterocyclic NH group in a heterocyclic part of the dye or via substituent groups selected from --OH; --NHR; --SH; --COOR; epoxy; --NHCOalkenyl; or --COalkenyl, in which R is --H or alkyl, and thereafter curing the mixture.
The term heterocyclic NH group means an NH group in which the nitrogen atom forms part of a heterocyclic ring. In many dyes the heterocyclic NH group will itself be capable of forming a covalent bond with the polymer precursor.
The polymer precursor may be any organic monomer, comonomer, polymer or copolymer and mixtures thereof having groups which are capable of reacting directly with the dye(s). Where mixtures of different polymer precursors are used at least one of the polymer precursors is required to be capable of reacting with the dye(s). Examples of polymer precursors include acrylates, methacrylates, acrylamides, methacrylamides, epoxides, esters, ureth

REFERENCES:
patent: 3499781 (1970-03-01), Krueckel
patent: 5231135 (1993-07-01), Machell et al.
patent: 5374493 (1994-12-01), Fukunaga et al.

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