Chemistry: molecular biology and microbiology – Micro-organism – tissue cell culture or enzyme using process... – Preparing oxygen-containing organic compound
Reexamination Certificate
2001-06-20
2003-07-22
Dawson, Robert (Department: 1712)
Chemistry: molecular biology and microbiology
Micro-organism, tissue cell culture or enzyme using process...
Preparing oxygen-containing organic compound
C106S031350, C106S031670, C106S031960, C106S219000, C106S243000, C435S136000, C523S161000, C523S404000, C523S406000, C523S414000
Reexamination Certificate
active
06596519
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ambient temperature-drying, baking or aqueous paint and electrodeposition paint composition to be used for the surface processing of automobiles, ships, heavy electric equipments, light electric appliances, construction machines, agricultural machines and domestic electric appliances, or an ink composition to be used for papers, plastics and woods. The paint or ink composition excellent in throwing power, appearance of the paint film, finishing sharpness, adhesion, etc. is obtained by using fatty acids of a vegetable oil obtained by the decomposition of the oil with an enzyme as a modifying agent, curing agent or the like for a resin for paints.
Methods for obtaining fatty acids by decomposing vegetable oils on an industrial scale include Twitchell decomposition method, wherein sulfuric acid is used, developed by Twitchell E. in 1897, a method comprising a combination of high-temperature alkali decomposition, acid decomposition and hot separation [Japanese Patent Unexamined Published Application (hereinafter referred to as “J. P. KOKAI”) No. Sho 49-124103] and a continuous high-pressure decomposition method reported by Vitor-Mills in 1935. The fatty acids thus obtained are used as modifying agents for alkyd resins or the like. They are widely used in the fields of paints and inks, taking advantage of the low costs and an excellent build. However, the quality (physical and chemical properties) of those fatty acids is yet satisfactory and unstable because they are colored upon decomposition, the quality of them is deteriorated by a thermal damage and they cannot be highly purified.
In particular, highly reactive polyvalent unsaturated fatty acids such as linseed fatty acids are easily damaged by heat to form trans acids and polymers in the course of the decomposition thereof. Therefore, they are usually purified by the distillation. However, they are not yet satisfactory as starting materials for paints in chromaticity and trans acid content. Further, as the technical innovations are rapidly advancing nowadays, functions required of paints are being enhanced and also the improvement in the functions such as the drape around a substrate, lightening in color and curing property is eagerly demanded.
As for paints for the electrodeposition coating, the reduction in amount of heavy metals (lead and tin) in paints for the cationic electrodeposition coating for motorcars and the development of these paints of low-temperature baking type and high-throwing power type are demanded.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a paint or ink composition excellent in throwing power, appearance of the paint film, finishing sharpness and adhesion, and having electrodeposition potential or ultraviolet curing property.
Another object of the present invention is to provide a resin for paints or a resin for inks, which is capable of providing the above-described excellent paint or ink composition.
Still another object of the present invention is to provide a modifying agent for resins for paints or a modifying agent for resins for inks, which is capable of providing the above-described excellent paint or ink composition.
A further object of the present invention is to provide a process for efficiently producing the above-described modifying agent for resins for paints or modifying agent for resins for inks.
After intensive investigations made for the purpose of attaining the above-described objects, the inventors have found that the throwing power, appearance of the paint film, finishing sharpness and adhesion of a paint or ink composition can be improved by using fatty acids, obtained by decomposing a vegetable oil or fat with an enzyme, as a modifying agent or curing agent for the resin. The present invention has been completed on the basis of this finding.
Namely, the present invention provides a paint or ink composition by containing a resin for paints or a resin for inks obtained by the modification with fatty acids obtained by decomposing a vegetable oil or fat with an enzyme.
The present invention also provides a resin for paints or a resin for inks obtained by the modification with fatty acids obtained by decomposing a vegetable oil or fat with an enzyme.
The present invention further provides a modifying agent for resins for paints or a modifying agent for resins for inks containing fatty acids obtained by decomposing a vegetable oil or fat with an enzyme.
The present invention also provides a process for producing a modifying agent for resins for paints or a modifying agent for resins for inks, which comprises decomposing a vegetable oil or fat with an enzyme to obtain fatty acids.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The present invention relates to fatty acids obtained by decomposing a vegetable oil or fat with an enzyme and/or a modifying agent for resins for paints or inks containing an oil or fat containing the fatty acids and excellent in water dispersibility, and a paint or ink composition excellent in throwing power, appearance of the paint film, finishing sharpness and adhesion.
In the present invention, the fatty acids usable as the modifying agent for the resins for paints or modifying agent for the resins for inks have a decomposition rate of preferably 5 to 99%, and the vegetable oil or fat is preferably linseed oil. Oils and fats containing the fatty acids have a fatty acid content of preferably 5 to 99% by weight and an index of degree of remaining unsaturation of at least 95. The resin modified with the modifying agent is preferably excellent in water dispersibility. Preferably the paint or ink composition has a modified resin content of 1 to 95% by weight, contains the fatty acids and has an electrodeposition potential.
The paint or ink composition of the present invention contains colorants such as a resin for paints, a coloring pigment, an extender pigment, an anti-corrosive pigment and a dye as the main elements for forming the paint film. The paint or ink composition may further contain, if necessary, secondary elements for forming the paint film such as a plasticizer, a drying agent, a surface controlling agent, an anti-silking agent, a defoaming agent, a rheological controlling agent and an ultraviolet absorber. Fatty acids for the modification, particularly fatty acids having many unsaturated bonds such as linseed fatty acids, can be used as the secondary elements for forming the paint film such as the plasticizer or controlling agents. Further, organic solvents and water are also usable as the secondary elements for forming the paint film, if necessary. The paint or ink composition of the present invention contains the pigment and/or dye in an amount of preferably 2 to 50% by mass, more preferably 10 to 30% by mass.
The paint or ink composition free from the colorant as the main element for forming the paint film is also included in the present invention. For example, clear lacquers composed of only the resin for the paint or ink and of the present invention and a solvent are also included in the paint or ink composition of the present invention. In this case, the solvent content is preferably 5 to 60% by mass, more preferably 30 to 50% by mass.
The paint or ink compositions of the present invention can be classified in various ways. For example, according to the curing (drying) method, they can be classified into ambient temperature-drying paints or inks, baking paints or inks, ultraviolet curing paints or inks and electron beam curing paints or inks. According to the paint film-forming elements, they can be classified into oily paints or inks, synthetic resin paints or inks, aqueous paints or inks and emulsion paints or inks. According to the painting methods, they can be classified into paints or inks for brush coating and those for electrodeposition coating.
An ink of the present invention containing an alkyd varnish, modified with linseed fatty acids, as a vehicle component of the ink is usable as a metal plate ink, lithographic ink, relief printing i
Gotou Naoki
Iguchi Akiko
Takayanagi Masaaki
Tsuchiya Kin-ya
Aylward D.
Burns Doane , Swecker, Mathis LLP
Dawson Robert
The Nisshin Oil Mills Ltd.
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