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Process for Tinting, Dyeing or doping or moulded Components Made of Transparent (Co)Polyamides in Aqueous Dye Bath

a technology of transparent polyamides and dye baths, which is applied in the direction of dyeing process, organic dyes, textiles and papermaking, etc., can solve the problem that none of the baths meets the condition of stability, and achieves the effect of fast dyeing, strong adhesion of dyestuffs to polymers, and excellent quality

Inactive Publication Date: 2007-12-27
EMS CHEM AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a method for dyeing molded components made from transparent polyamides using stable aqueous dye baths. The dye baths remain stable for at least one week without any components precipitating or changing the tint of color of the dyed molded article. The surface of the molded components remains in excellent quality, and simultaneously, a strong adhesion of the dye to the polymer is achieved, avoiding staining in later steps of treating. Additionally, the invention provides a faster dyeing process. The invention solves the problem of staining during dyeing and achieves a stable dye bath that can be used for at least one week without any issues.

Problems solved by technology

None of the baths fulfills the condition for stability.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Producing Polyamide PA1

[0111] 35.7 kg diamine MACM (3,3-diamino-4,4-dimethyl dicyclohexyl methane) and 34.2 kg dodecane dicarboxylic acid are mixed with 30 kg water in a 130 L autoclave with stirrer. After heating up to 280° C. and at a pressure of maximum 30 bar, preferred 20 bar, the formulation is released to normal pressure and degassed to the desired viscosity. The polymer melting mass is discharged in strands, cooled down in a water bath and granulated. After drying, a relative viscosity in 0.5% m-cresol of 1.73 and a Tg of 153° C. is achieved. The polyamide is amorphous and crystal clear.

[0112] On an Arburg injection moulding machine, round plate-shaped lenses 70×2 mm are produced in polished tool. The cylinder temperature is between 260 and 340° C. with tool temperatures between 45 and 140° C. These plate-shaped lenses have a haze of 0.30 and a light transmission of 94% and are dyed in the processing bath.

example 2

Producing Polyamide PA2

[0113] 23.0 kg diamine PACM (3,3-diamino dicyclohexyl methane) and 11.2 kg diamine MACM (3,3-diamino-4,4-dimethyl dicyclohexyl methane) and 35.7 kg dodecane dicarboxylic acid are mixed with 30.0 kg water in a 130 L autoclave with stirrer. After heating up to 280° C. and at a pressure of maximum 30 bar, preferred 20 bar, the formulation is released to normal pressure and degassed to the desired viscosity. The polymer melting mass is discharged in strands, cooled down in a water bath and granulated. After drying, a relative viscosity in 0.5% m-cresol of 1.85 and a Tg of 144° C. and melting point of 237° C. are achieved. The polyamide is microcrystalline and crystal clear.

example 3

Producing Polyamide PA3

[0114] 30.0 kg diamine MACM (3,3-diamino-4,4-dimethyl dicyclohexyl methane) and 20.7 kg isophthalic acid and 26.0 kg laurin lactam are mixed with 23.0 kg water in a 130 L autoclave with stirrer. After heating up to 280° C. and at a pressure of maximum 30 bar, preferred 20 bar, the formulation is released to normal pressure and degassed to the desired viscosity. The polymer melting mass is discharged in strands, cooled down in a water bath and granulated. After drying a relative viscosity in 0.5% m-cresol of 1.55 and a Tg of 160° C. are achieved. The polyamide is amorphous and crystal clear.

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PUM

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Abstract

The present invention relates to a novel composition of dye baths or processing baths and a process for tinting, dyeing or doping of moulded components with functional additives in these aqueous dipping baths or processing baths. The moulded components contain transparent or translucent (co)polyamides. If the moulded components should be tinted or dyed according to an embodiment of the invention, the dyeing can be performed as homogeneous dyeing or as gradient dyeing. The process according to the present invention is particularly suitable for producing high-value objects like ophthalmic lenses, sun lenses for eyeglasses, magnifying glasses, all kinds of inspection glasses, polarization films and display films, particularly if changing depths of color (gradients) are desired. This generating of a dyeing gradient requires dyeing in a dipping process, whereby the desired depth of color is achieved by multiple times of dipping the surface areas of the moulded article in the dye bath.

Description

FIELD OF INVENTION [0001] The present invention relates to a novel composition of dye baths or processing baths and a process for tinting, dyeing or doping of moulded components with functional additives in these aqueous dipping baths or processing baths. The moulded components basically contain transparent or translucent (co)polyamides. The temperature of the dipping baths or processing baths is below the glass transition temperature (Tg) of the (co)polyamides. If the moulded components should be tinted or dyed according to an embodiment of the invention, the dyeing can be performed as homogeneous dyeing or as gradient dyeing. [0002] The process according to the present invention is particularly suitable for producing high-value objects like ophthalmic lenses, tinted lenses for sunglasses, magnifying glasses, all kinds of inspection glasses, polarization films and display films, particularly if changing depths of color (gradients) should be generated. [0003] This generating of a dy...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D06P3/24
CPCC09B67/0082C09B67/0073
Inventor THULLEN, HELMUTBUEHLER, FRIEDRICH SEVERINGRAND, MARCEL
Owner EMS CHEM AG
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