Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1998-01-06
1999-10-12
Jagannathan, Vasu
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
106 316, 106 3173, 525390, 525391, C09D 1106, C09D 1108
Patent
active
059656336
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention is concerned with improvements in and relating to printing inks, especially printing inks for use in lithographic printing processes such as offset lithography.
2. Description of the Related Art
It is an essential requirement of inks for use in lithographic printing processes that they be oleophilic in character and, accordingly, in order to wash them from printing apparatus it has been considered necessary to use organic solvent systems as wash media. It has been proposed, e.g. in WO94/06873, to provide lithographic inks which can be washed from printing apparatus by the use of aqueous wash media, such inks containing at least one component containing free carboxylic acid groups so that the component can be rendered hydrophilic by complete or partial neutralization of the carboxylic acid groups, i.e. by using an alkaline aqueous wash medium. In the unneutralized form the component is sufficiently hydrophobic to make it suitable for use in a lithographic printing ink.
Typically, the carboxylic acid group-containing component used in the various lithographic inks particularly described in WO94/06873 is an alkyd resin having an acid value of 25 mgKOH/g or more and, in order to obtain washability, using an aqueous alkaline wash, for the ink as a whole, relatively large amounts of such alkyd resins have to be employed, with consequent restraints on flexibility of formulation often with a reduction in the potential printing properties of the resultant ink.
SUMMARY OF THE INVENTION
It has now been found, in accordance with the present invention, that the reaction products of relatively highly acid functional hard resins with vegetable oils or like aliphatic carboxylic acid ester oils and/or alkyd resins can serve as useful components of lithographic printing inks, capable of affording the ink with the ability to be washed from a printing press using an aqueous alkaline wash medium and also making it possible to formulate a wide range of inks having good overall printing properties.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
In the following specification aliphatic carboxylic acid ester oils (including vegetable oils, marine oils and the like synthetic products) will simply be referred to as "fatty ester oils".
Accordingly, one embodiment of the present invention provides a lithographic printing ink containing an alkali-soluble or dispersible binder material which is the reaction product of an acid functional hard resin with a fatty ester oil and/or an alkyd resin, wherein the hard resin has an acid value of at least 50 mgKOH/g. The invention also provides a method of lithographic printing using such an ink.
As discussed in more detail below, printing inks in accordance with the invention will also contain other components, such as diluents, colourants, other resinous binder materials, drying agents etc. However, an essential component of the printing inks of the invention is the reaction product of an acid functional hard resin with a fatty ester oil and/or an alkyd resin.
Hard resins are well-known components of printing inks such as offset lithographic inks and are solid, fusible resins, typically having a melting point of 100.degree. C. or higher (see, for example, "The Printing Ink Manual", Fifth Edition, R. H. Leach ed., Blueprint, 1993, at pages 369/370).
Suitable hard resins for use in the production of the acidic reaction product include rosin esters, phenolic modified rosin esters, rosin modified maleic resins, rosin modified fumaric resins, formophenolic resins, terpene phenolic resins, hydrocarbon resins, phenolic resins and rosin and maleic modified hydrocarbon resins. Such resins are described, for example, in "Printing Inks for Lithography", Owen D. J., SITA Technology, 1994, at pages 58-72; "A Manual for Resins for Surface Coatings", Vol. I, (Second Edition), Goldring and Hayward, SITA Technology 1994, at pages 93-105 and 109-113. In contrast to the hard resins used in conventional lithgraphic inks, the hard resins used in a
REFERENCES:
patent: 2346968 (1944-08-01), Jeuck et al.
patent: 2720461 (1955-10-01), Voet
patent: 3017374 (1962-01-01), Bernardi et al.
patent: 4252699 (1981-02-01), Tsuchiya et al.
patent: 4304601 (1981-12-01), Sharp
patent: 4357164 (1982-11-01), Tsuji et al.
patent: 4398016 (1983-08-01), Homma et al.
patent: 4639492 (1987-01-01), Makhlouf
patent: 5030283 (1991-07-01), Bender et al.
patent: 5178672 (1993-01-01), Miller
patent: 5308390 (1994-05-01), Pennaz
patent: 5382282 (1995-01-01), Pennaz
patent: 5427615 (1995-06-01), Jordan
patent: 5431721 (1995-07-01), Pennaz et al.
patent: 5552467 (1996-09-01), Reiter et al.
Database WPI, Section Ch, Week 9250, Derwent Publications Ltd., London, Great Britain, AN 92-413926, XP002013925, and SU-A-1,708,821, Jan. 30, 1992.
Deluxe Corporation
Jagannathan Vasu
S Coates Lorilleux S.A.
Shosho Callie E.
LandOfFree
Printing inks does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Printing inks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Printing inks will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-653271