Process for multicolor dyeing of vegetable ivory products

Bleaching and dyeing; fluid treatment and chemical modification – Nontextile – dyeing process or product – including inorganic... – Amide polymer substrate

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Details

8517, 24 90A, 24 90R, D06P 304, A44B 1125

Patent

active

052735524

DESCRIPTION:

BRIEF SUMMARY
The present invention concerns a process for the multicolor dyeing of items made of vegetable ivory, and namely for the dyeing of buttons made of said material, to which it will be referred to in the present description, without however limiting thereto the scope of the invention.
Vegetable ivory is the preferred raw material for the manufacture of buttons for quality clothing. In fact, though being more economic than nacre, it gives equally satisfactory aesthetic results. Vegetable ivory is constituted by the albumen of the seed of some palms and pandaceae, among which the major ones are those supplying corozo and dum nuts. Vegetable ivory, suitably dried and sliced, is then worked to obtain white buttons which are then dyed in aqueous bath similarly to what occurs for dyeing vegetable textile fibres.
A one-color button is thus easily obtained. Obtaining a multicolor dyeing of the buttons is on the contrary much more difficult.
A known method for manufacturing multicolor buttons envisages to apply one or more dyes to selected areas of the surface of the still "white" button and to dye afterwards the button thus obtained into a bath of a lighter color than those previously applied, the latter ones therefore remaining visible through the last applied dye.
This method has two major drawbacks: first, the originally imparted color of the selected areas is modified by the superimposition of the lighter dye. Secondly, a good fixing of the initially applied color can not be obtained, because said initial color is applied by techniques necessarily different from that of the aqueous bath.
There is therefore the need of a process for the multicolor dyeing of products made of vegetable ivory, and in particular of buttons, which is capable to solve the above reported problems.
Object of the present invention is to provide a dyeing process for vegetable ivory products allowing to dye lastingly said products in several colors in a simple, effective and economic way.
More in particular, the present invention provides a process for the multicolor dyeing of vegetable ivory products, in particular of buttons comprising the following steps: products; surface a solution of a water-insoluble protective resin; evaporating the solvent from said solution until a film for temporarily protecting said areas is obtained; performing a second treatment in water to obtain the dyeing of the non protected areas; fixing the applied dye to said product; and removing said protecting film; the stages of protecting and dyeing being repeated for each desired color besides the base one.
The invention will be now described more in detail with reference to the accompanying FIGURE which shows a block diagram of the process according to the invention.
As shown in said FIGURE, the still "white" vegetable ivory button 1, i.e. still having its natural color and not yet dyed, first undergoes, step A, a treatment in water which, according to different needs, may be an actual dyeing to give a base color to the button, or only constitute a bath in water, should one prefer to maintain said natural ivory white as the base color. In both cases, the wet button impregnates with water and swells, i.e. it undergoes a soaking treatment. The subsequent stage B envisages to apply on preselected areas 2, 3 of the thus wetted (i.e. soaked and possibly dyed) button a solution of water insoluble protective resin. The solution is preferably applied by spraying using stencils which prevent application of the solution to those portions of button 4,5 which are not to be protected.
It is necessary to perform said first treatment in water (stage A) in order to allow the button to swell. In fact the wetted button, at the of a dyeing treatment, is approximately 15% larger than its original size when dry; should the film be applied on the dry button, in former might crack or in any case cover a smaller area than the desired one when the button afterwards is wetted and swells.
In stage C the solvent of the sprayed solution is allowed to evaporate until a film protecting the surfa

REFERENCES:
patent: 4172702 (1979-10-01), Bernier et al.
patent: 4251582 (1981-02-01), Bernier et al.

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