CH390436A - Process for the preparation of a coloring substance for the dry coloring of thermoplastics and coloring substance obtained by this process - Google Patents
Process for the preparation of a coloring substance for the dry coloring of thermoplastics and coloring substance obtained by this processInfo
- Publication number
- CH390436A CH390436A CH710860A CH710860A CH390436A CH 390436 A CH390436 A CH 390436A CH 710860 A CH710860 A CH 710860A CH 710860 A CH710860 A CH 710860A CH 390436 A CH390436 A CH 390436A
- Authority
- CH
- Switzerland
- Prior art keywords
- dye
- coloring
- stearic acid
- metal salt
- stearate
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09B—ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES, e.g. PIGMENTS; MORDANTS; LAKES
- C09B67/00—Influencing the physical, e.g. the dyeing or printing properties of dyestuffs without chemical reactions, e.g. by treating with solvents grinding or grinding assistants, coating of pigments or dyes; Process features in the making of dyestuff preparations; Dyestuff preparations of a special physical nature, e.g. tablets, films
- C09B67/006—Preparation of organic pigments
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/02—Organic and inorganic ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Description
Procédé de préparation d'une substance colorante pour la coloration à sec des matières thermoplastiques et
substance colorante obtenue par ce procédé
La coloration à sec des matières thermoplastiques est pratiquée depuis plusieurs années. Les substances colorantes utilisées habituellement à cet effet présentent l'inconvénient de se disperser imparfaitement dans la matière thermoplastique en donnant naissance à des marbrures indésirables.
Une substance colorante se disperse théorique ment d'autant mieux qu'elle est plus finement divisée, mais une trop grande finesse donne lieu en pratique à un dégagement de poussières tel que le procédé de coloration devient inapplicable.
La présente invention a pour objet un procédé de préparation d'une substance colorante, pour la coloration à sec de matières thermoplastiques, ne donnant pas lieu à la formation de poussières gênantes et se dispersant parfaitement dans lesdites matières. La présente invention a également pour objet la substance colorante obtenue par ce procédé.
Le procédé selon l'invention est caractérisé par le fait qu'on réduit au moins un colorant en particules ayant un diamètre de 4 à 8 microns et qu'on lui incorpore des adjuvants constitués par un sel métallique de l'acide stéarique, de la silice synthétique et une huile minérale.
Un mode d'exécution du procédé selon l'invention, donné à titre d'exemple, consiste à mélanger un colorant avec un sel métallique de l'acide stéarique, de la silice synthétique et une huile minérale, puis à broyer le mélange obtenu dans un broyeur muni d'un dispositif tel qu'un tamis permettant seulement le passage des particules d'un diamètre compris entre 4 et 8 microns.
Selon la coloration désirée, on peut employer des colorants tels que par exemple le blanc de titane rutile, l'oxyde de zinc, le jaune de cadmium, le rouge de cadmium clair, le bleu de phtalocyanine.
On peut également utiliser un mélange de colorants.
Les sels métalliques de l'acide stéarique (stéarates d'aluminium, de calcium, de magnésium, de plomb, de zinc par exemple) jouent le rôle d'agents dispersants.
La silice synthétique augmente le volume de la substance colorante et assure ainsi une meilleure répartition du colorant à la surface des particules de matière thermoplastique sans nuire, du fait de sa transparence à la coloration.
L'huile minérale améliore l'adhérence du colorant à la matière thermoplastique.
Dans certains cas, il est avantageux d'ajouter ou mélanger une charge telle que le sulfate de baryum précipité par exemple. La substance colorante obtenue par le procédé selon l'invention convient particulièrement à la coloration du polystyrène, du polypropylène et du polyéthylène. Elle présente sur les substances colorantes habituelles les avantages sui vants: son emploi est plus facile, elle ne donne pas lieu à la formation de poussières, elle se disperse mieux dans la matière thermoplastique et permet de réaliser une économie de colorant.
Exemples de mélanges selon l'invention 1. Colorant blanc: Blanc de titane rutile 93 oxo
Silice synthétique . 2 O/o
Huile de paraffine . 2 /o
Stéarate de mainésium . 3 O/o
Process for the preparation of a coloring substance for the dry coloring of thermoplastics and
coloring substance obtained by this process
Dry coloring of thermoplastic materials has been practiced for several years. The coloring substances usually used for this purpose have the drawback of dispersing imperfectly in the thermoplastic material, giving rise to undesirable mottling.
A coloring substance is theoretically dispersed the better the more finely divided it is, but too great a fineness gives rise in practice to a release of dust such that the coloring process becomes inapplicable.
The present invention relates to a process for preparing a coloring substance, for the dry coloring of thermoplastic materials, which does not give rise to the formation of troublesome dust and which disperses perfectly in said materials. A subject of the present invention is also the coloring substance obtained by this process.
The process according to the invention is characterized by the fact that at least one dye is reduced to particles having a diameter of 4 to 8 microns and that adjuvants consisting of a metal salt of stearic acid, synthetic silica and mineral oil.
An embodiment of the process according to the invention, given by way of example, consists in mixing a dye with a metal salt of stearic acid, synthetic silica and a mineral oil, then in grinding the mixture obtained in a grinder fitted with a device such as a sieve allowing only the passage of particles with a diameter of between 4 and 8 microns.
Depending on the desired coloring, dyes such as rutile titanium white, zinc oxide, cadmium yellow, light cadmium red or phthalocyanine blue can be used.
It is also possible to use a mixture of dyes.
The metal salts of stearic acid (aluminum, calcium, magnesium, lead, zinc stearates for example) play the role of dispersing agents.
Synthetic silica increases the volume of the coloring substance and thus ensures better distribution of the dye on the surface of the particles of thermoplastic material without being detrimental, due to its transparency to coloring.
Mineral oil improves the adhesion of the dye to the thermoplastic material.
In some cases, it is advantageous to add or mix a filler such as precipitated barium sulfate for example. The coloring substance obtained by the process according to the invention is particularly suitable for coloring polystyrene, polypropylene and polyethylene. It has the following advantages over the usual coloring substances: its use is easier, it does not give rise to the formation of dust, it is better dispersed in the thermoplastic material and makes it possible to save dye.
Examples of mixtures according to the invention 1. White dye: Rutile titanium white 93 oxo
Synthetic silica. 2 Y / o
Paraffin oil . 2 / o
Mainnesium stearate. 3 Y / o
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH710860A CH390436A (en) | 1960-06-23 | 1960-06-23 | Process for the preparation of a coloring substance for the dry coloring of thermoplastics and coloring substance obtained by this process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH710860A CH390436A (en) | 1960-06-23 | 1960-06-23 | Process for the preparation of a coloring substance for the dry coloring of thermoplastics and coloring substance obtained by this process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CH390436A true CH390436A (en) | 1965-04-15 |
Family
ID=4320085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CH710860A CH390436A (en) | 1960-06-23 | 1960-06-23 | Process for the preparation of a coloring substance for the dry coloring of thermoplastics and coloring substance obtained by this process |
Country Status (1)
| Country | Link |
|---|---|
| CH (1) | CH390436A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2312153A1 (en) * | 1972-03-14 | 1973-09-27 | Ciba Geigy Ag | Mass dyeing thermoplastic polymers - with mixture of dye and metal salt of higher fatty acid, or compatible resin |
| EP0031857A1 (en) * | 1979-12-28 | 1981-07-15 | Wavin B.V. | A stabilised colouring composition for thermoplastics, a method of manufacturing plastics and plastics mixed with the colouring composition |
| DE4404953A1 (en) * | 1994-02-17 | 1995-08-24 | Metallgesellschaft Ag | Pigments and/or fillers contg sulphide sulphur |
-
1960
- 1960-06-23 CH CH710860A patent/CH390436A/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2312153A1 (en) * | 1972-03-14 | 1973-09-27 | Ciba Geigy Ag | Mass dyeing thermoplastic polymers - with mixture of dye and metal salt of higher fatty acid, or compatible resin |
| EP0031857A1 (en) * | 1979-12-28 | 1981-07-15 | Wavin B.V. | A stabilised colouring composition for thermoplastics, a method of manufacturing plastics and plastics mixed with the colouring composition |
| DE4404953A1 (en) * | 1994-02-17 | 1995-08-24 | Metallgesellschaft Ag | Pigments and/or fillers contg sulphide sulphur |
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