COLORING PROCESS FOR POLY(METH)ACRYLATES WITH WATER-BASED LIQUID DYES, AND WATER-BASED LIQUID DYES

Abstract

The invention relates to an aqueous colorant preparation for coloring thermoplastic plastics.

Claims

1. (canceled)

2. A method of making a colored thermoplastic polymer product, the method comprising adding a colorant preparation to a molten uncoloured thermoplastic polymer composition during injection molding or extrusion of the uncoloured thermoplastic polymer to produce a thermoplastic polymer product with the colorant preparation is within the matrix of the thermoplastic polymer, wherein the colorant preparation comprises 1% by weight to 49% by weight of a modified polyacrylate in the form of a 48% by weight to 52% by weight aqueous solution, 0.5% by weight to 50% by weight of a colorant or of a colorant mixture, 0% by weight to 50% by weight of one or more further additives and demineralized water, where the portions by weight of the components add up to 100% by weight.

3. The method of claim 2, wherein the colorant or colorant mixture comprises an organic colour pigment, an organic soluble dye, an inorganic pigment, a mixture of an organic colour pigment, an organic soluble dye, and an inorganic pigment, or carbon black.

4. The method of claim 2, wherein the colorant or colorant mixture comprises at least one organic pigment selected from the group consisting of a diazo dye, phthalocyanine, perylene, and anthraquinone.

5. The method of claim 2, wherein the colorant or colorant mixture comprises at least one organic soluble dye selected from the group consisting of anthrapyrimidine, quinophthalone, perinone, and a monoazo dye.

6. The method of claim 2, wherein the colorant or colorant mixture comprises at least one inorganic pigment selected from the group consisting of zinc chromate, cadmium sulphide, chromium oxide, an ultramarine pigment, metal flakes, BaSO.sub.4, and TiO.sub.2.

7. The method of claim 2, which is an impact modified poly(meth)acrylate.

Description

EXAMPLES

[0105] Production of the Coloured Thermoplastic Polymer Moulding Material

[0106] Colouring with Colorant Preparation

[0107] Examples 1 to 4 were produced in the following manner:

[0108] Polymer granule and colorant preparation were used in a tumbling mixer to produce a mixture which was metered by means of a funnel into the intake zone of a single-screw extruder. The venting zones were attached to a vacuum pump. A granulator was connected downstream of the extruder. In a second processing step, specimens for the Vicat softening temperature determination were injection-moulded from the granules thus obtained.

Comparative Example 1 for Colouring with Organic Binder (Fatty Acid Ester)

[0109] Composition: [0110] Colorant: [0111] 0.06% by weight of Thermoplastrot 454 [0112] 0.016% by weight of Macrolexgelb G [0113] 0.3% by weight of octadecenoic acid, present to an extent of approx. 70 mol % as an oligoethylene glycol mono- and diester, the remaining 30% being esterified with sugars/sugar alcohols [0114] 99.62% by weight of PLEXIGLAS 8N moulding material

[0115] Vicat softening temperature: 106 C.

[0116] For comparison:

[0117] Vicat softening temperature of the PLEXIGLAS 8N moulding material comprising 0.06% by weight of Thermoplastrot 454 and 0.016% by weight of Macrolexgelb G without C18 fatty acid: 107 C.

[0118] Injection moulding on a Battenfeld BA 350CD:

[0119] Injection time: 1.76 sec

[0120] Material temp.: 250 C.

[0121] Cylinder temp.: 250 to 230 C.

[0122] Mould temp.: 68 C.

[0123] Switch from injection to hold pressure at internal mould pressure 560 bar

[0124] Total cycle time: 50 sec

[0125] Injection moulding with open venting cylinder

[0126] After 30 shots, severe mould deposits and red dye deposition

Example 2: Addition of Pure Waterborne Binder without Colour Pigments

[0127] Composition: [0128] 0.32% by weight of distilled water [0129] 0.17% by weight of EFKA 4550 (50% aqueous mod. polyacrylate) [0130] 0.01% by weight of defoamer [0131] 0.0006% by weight of antidecay agent [0132] 99.5% by weight of PLEXIGLAS 8N moulding material

[0133] Injection moulding on Arburg 221: no deposit formation

[0134] Injection time: 1.5 sec

[0135] Material temp.: 250 C.

[0136] Cylinder temp.: 250 to 225 C.

[0137] Mould temp.: 68 C.

[0138] Path-dependent switch from injection to hold pressure

[0139] Total cycle time: 30 sec

[0140] Injection moulding with open venting cylinder

[0141] In this experiment, no Vicat softening temperature increase was observed; the Vicat softening temperature was 107 C. both with and without binder.

Example 3: Colouring with Thermoplastrot 454 in the Form of a Waterborne Liquid Dye

[0142] Composition: [0143] 0.193% by weight of distilled water [0144] 0.1% by weight of EFKA 4550 (50% aqueous mod. polyacrylate) [0145] 0.006% by weight of defoamer [0146] 0.00035% by weight of antidecay agent [0147] 0.2% by weight of Thermoplastrot 454 [0148] 99.5% by weight of PLEXIGLAS 8N moulding material

[0149] Injection moulding on Battenfeld BA 350CD: no deposit formation

[0150] Injection time: 1.77 sec

[0151] Material temp.: 248 C.

[0152] Cylinder temp.: 250 to 230 C.

[0153] Mould temp.: 68 C.

[0154] Switch from injection to hold pressure at internal mould

[0155] pressure 565 bar

[0156] Total cycle time: 50 sec

[0157] Injection moulding with open venting cylinder

[0158] Compared to uncoloured PLEXIGLAS 8N moulding material, the Vicat softening temperature increased by 2.5 C. from 106 C. to 108.5 C.

Example 4: Colouring with Paliotogelb K2270 in the Form of a Waterborne Liquid Dye

[0159] Composition: [0160] 0.193% by weight of distilled water [0161] 0.1% by weight of EFKA 4550 (50% aqueous mod. polyacrylate) [0162] 0.006% by weight of defoamer [0163] 0.00035% by weight of antidecay agent [0164] 0.2% by weight of Paliotogelb K2270 (Pigment Yellow 183) [0165] 99.5% by weight of PLEXIGLAS 8N moulding material

[0166] Injection moulding on Battenfeld BA 350CD: no deposit formation

[0167] Injection time: 1.76 sec

[0168] Material temp.: 250 C.

[0169] Cylinder temp.: 250 to 230 C.

[0170] Mould temp.: 68 C.

[0171] Switch from injection to hold pressure at internal mould pressure 560 bar

[0172] Total cycle time: 50 sec

[0173] Injection moulding with open venting cylinder

[0174] Compared to uncoloured PLEXIGLAS 8N moulding material, the Vicat softening temperature increased by 2.5 C. from 106 C. to 108.5 C.

[0175] The liquid dyes according to Example 5 and Example 6 were each applied by drum application (tumbling mixer) to an extent of 0.5% by weight to PLEXIGLAS 8N, and compounded on a 30 mm Stork single-screw extruder at 230 C. There was no vacuum on the open vacuum zone. On injection moulding of the compounds on an Arburg 221, no mould deposits were observed.

[0176] Injection time: 1.5 sec

[0177] Material temp.: 250 C.

[0178] Cylinder temp.: 250 to 225 C.

[0179] Mould temp.: 68 C.

[0180] Path-dependent switch from injection moulding to hold pressure

[0181] Total cycle time: 30 sec

[0182] Injection moulding with open venting cylinder

[0183] The Vicat softening temperature of the moulding material remained constant at 108 C.

Example 5

[0184]

TABLE-US-00001 Name Amounts (in % by weight) EFKA 4550 20 Demineralized water 38.74 Byk 024 1.2 Sandoplast Rot G 6.87 Blanc Fix N 31.54 Kronos 2220 1.580 (titanium dioxide) Ebotec MT 15 0.07

Example 6

[0185]

TABLE-US-00002 Name Amounts (in % by weight) EFKA 4550 20 Demineralized water 38.73 Byk 024 0.6 Kronos 2220 40.0 (titanium dioxide) Ebotec MT 15 0.07

[0186] The titanium dioxide was dispersed before addition on a drum mill.

[0187] The results show that the Vicat softening temperature is not reduced but in some cases increased, and that, on injection moulding of the thermoplastic polymer moulding material coloured with the inventive colorant preparation, no deposits form on the injection moulds.

[0188] The Vicat softening temperature of the polymers was determined in ISO 306.