Compositions: coating or plastic – Materials or ingredients – Pigment – filler – or aggregate compositions – e.g. – stone,...
Patent
1997-03-25
1999-01-12
Green, Anthony
Compositions: coating or plastic
Materials or ingredients
Pigment, filler, or aggregate compositions, e.g., stone,...
106 1421, 106 1439, 106 1505, 106 1813, 106 183, 252601, 423278, 423289, 424 7809, 424660, 4273977, 428403, 428404, 428920, 428921, C09C 102, C09D 508, C09D 514, C09D 518
Patent
active
058580794
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a novel pigment composition having excellent anti-corrosive, anti-bacterial/anti-fungal and anti-flammable properties, a method of making the same, and processes of imparting anti-corrosive, anti-bacterial/anti-fungal and non-flammable properties to materials by utilizing the properties of the aforesaid pigment composition.
BACKGROUND ART
Conventionally, anti-corrosive paints containing an anti-corrosive pigment have been used for the corrosion prevention of a base material such as made of iron.
The Japanese Industrial Standards (JIS) specify eight kinds of anti-corrosive paints which differ depending on the kind of anti-corrosive pigments contained therein. Among those, six kinds of the anti-corrosive paints contain chromium-based or lead-based anti-corrosive pigments. The chromium-based anti-corrosive pigments specified by JIS include zinc chromate (ZPC type and ZTO type) and the like, and the lead-based anti-corrosive pigments include minium, lead suboxide, basic lead chromate and the like.
The above anti-corrosive pigments have superior anti-corrosive property and, therefore, have been widely used. However, they contain either chromium or lead which is harmful if absorbed into human bodies. Recently, there has been a growing demand for a pollution-free anti-corrosive pigment free from such harmful substances.
Examples of the conventionally known anti-corrosive pigments which contain neither chromium nor lead include phosphate-based pigments such as zinc phosphate and aluminum phosphate, and molybdate-based pigments such as zinc molybdate and calcium molybdate. However, any of the anti-corrosive pigments having superior anti-corrosive property comparable to that of the chromium-based or lead-based anti-corrosive pigments is yet to come in practice.
A barium metaborate, one of borate-based pigments, is also known as a low-pollution anti-corrosive pigment which contains neither chromium nor lead.
However, barium metaborate is specified to be a non-medical deleterious substance by the Japanese poisonous and Deleterious Substances Control Law and other applicable laws. Therefore, special attention should be given to the health and safety of a person who handles barium metaborate, and care should be taken not to allow people to directly touch a portion on which a paint containing the barium metaborate pigment is applied. Thus, the use of barium metaborate is limited by such situations.
Further, conventional anti-corrosive pigments such as zinc chromate are colored per se, thereby limiting the coloration of paints.
Inventors of the present invention have conducted several researches into a novel anti-corrosive pigment as an alternative to the conventional ones.
As a result, the inventors have had the findings that a strontium borate pigment represented by the general formula (1) is pollution-free and less toxic, and that it is excellent in anti-corrosive property and has no possibility of limiting the coloration of paints because it is white.
The inventors have also found a fact that the above strontium borate pigment is excellent not only in anti-corrosive property but also in anti-bacterial/anti-fungal and non-flammable properties.
However, it has been revealed that the anti-corrosive, anti-bacterial/anti-fungal and non-flammable properties cannot be maintained over a long period because the strontium borate pigment is water-soluble. Where the strontium borate pigment is dispersed in a material such as a paint or a molded product, penetration of moisture into the material causes the strontium borate pigment to dissolve and leach from the material or causes a paint coating film to be swelled and lifted, making it impossible to maintain the anti-corrosive, anti-bacterial/anti-fungal and non-flammable properties over an extended period.
The strontium borate pigment is typically prepared by reacting a water-soluble strontium salt with boric acid or a water-soluble borate in water. The strontium borate pigment thus prepared has large particle diameters, typica
REFERENCES:
patent: 3060049 (1962-10-01), Buckman et al.
patent: 3380836 (1968-04-01), Robinson
Kaihatsu Taizo
Ohtsu Koichi
Green Anthony
Sakai Chemical Industry Co. Ltd.
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