Improvements in the Manufacture of Coloured Rubber Goods, or Rubber Coated Goods, and a Material or Preparation to be used in the said Manufacture.
Year: 1891

page_text: Date of Application, 14th Oct., 1391-Accepted, 5th Dec., 1891
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Coloured Rubber Goods, or
Rubber Coated Goods, and a Material or Preparation to be used
in the said Manufacture.
I CHARLES DREYFUS Director and General Manager of the Clayton Aniline
Company Limited of Clayton near Manchester in the County of Lancaster do
hereby declare the nature of this invention and in what manner the same is
to be performed to be particularly described and ascertained in and by the
following statement :-
Hitherto the only colours that have been produced on rubber coated fabrics and
other rubber goods are those that have been mechanically mixed with the rubber
solution or with the "swelled" rubber prepared in the usual way with so called
"solvent naphtha." Attempts have also been made to colour the rubber with aniline
dyes by dissolving the same in methylated spirits of wine and adding shellac or
other gum or resin but according to my invention I colour the solvent itself which
is to be used for bringing into solution the rubber and thus I am able to produce a
variety of coloured rubber goods of a better description than those hitherto
produced. The lakes produced by treating an aqueous solution of resin soap with
metallic salts or salts of an alkaline earth and a basic coal tar dye are according to
my invention dissolved in the rubber solvent and such coloured solvent I employ in
the manufacture of coloured rubber goods such as rubber coated fabrics rubber
tubings toys balls and the like which may be done in the manner in which ordinary
uncoloured "solvent naphtha" is at present employed.
In carrying out my invention I may proceed as follows but I do not limit myself
to the precise details hereinafter given.
I dissolve in benzole or its homologues or in mixtures of them or in the solvent
also called "dissolving naphtha" of commerce a suitable quantity of any of the
aforesaid coloured lakes or any mixtures of them and I filter this solution or I may
use it without filtration. I put into this coloured solvent the rubber (which may be
prepared as usual) or a mixture of rubber and so called "substitute." The coloured
mass of rubber and solvent thus prepared is used for the manufacture of rubber
goods which may be carried on in the manner in which the manufacture of
uncoloured goods is at present performed and the vulcanizing and after operations
may be performed in the same manner as at present.
In the case of rubber coated fabrics I can apply the coloured rubber mass either
wholly or only as the last layer or layers. For example where several layers of
rubber are put on the fabric I may use the coloured rubber either for all the layers
or only for the last one two or more layers.
I prefer to put the first layer on without the colour as then there is no
danger of the colour penetrating to the other side of the fabric.
I may also put on the last one or more layers of rubber with the usual mixture
without any colour. I can also apply the solution of the colour in the solvent after
vulcanization in which case the solution may be applied to the fabric by means of a
roller or other appliance, and I may use it for other rubber goods in the usual way
adopted for colouring such goods.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
1. In the manufacture of coloured rubber goods or coloured rubber coated
goods the use of a coloured solvent for the rubber substantially as hereinbefore
described

page_text: 2. In the manufacture of coloured rubber goods or coloured rubber coated goods
the dissolving of the rubber in a sclvent to which is added a combination of solutions
of resin soap and metallic salt (or a salt of an alkaline earth) and basic coal tar dye
substantially as hereinbefore described.
3. For the manufacture of coloured rubber goods or coloured rubber coated
goods a solution of rubber in a solvent which has been previously coloured
substantially as herein before described.
4. In the manufacture of rubber coated goods the application to the fabric of
layers of rubber coloured as described with uncoloured layers intervening between
the coloured layer or layers and the fabric substantially as hereinbefore described.
5. As a material for use in the manufacture of coloured rubber goods or
coloured rubber coated goods a rubber solvent coloured by the addition of
colouring matter substantially as herein before described.
Dated this 14th day of October 1891.