BE487527A - - Google Patents

Description

       

  'Improvements in manufacturing processes for yarns, etc., consisting of the reaction product of rubber and sulfur dioxide'

  
The present invention relates to a process for

  
 <EMI ID = 1.1>

  
by the reaction product of rubber and sulfur dioxide.

  
We already know the manufacture of threads, filaments, ribbons,

  
rubber films and the like and which are subsequently subjected to the

  
of SO2 in the presence of a catalyst. however, in this case, we use

  
a rubber solution as the starting material.

  
 <EMI ID = 2.1>

  
and the danger resulting from their use. In addition, the treatment to which the rubber must be subjected before the solution is prepared makes the use of rubber solutions expensive.

  
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solution in the partially broken state, which has a detrimental influence on the solidity of the product obtained from the

  
solution.

  
The process, applied when starting with rubber in solution, cannot be used when using latex as the starting material. When mixing the necessary catalyst, if desired as a solution. latex, when this latex is transformed, by extrusion in a bath

  
 <EMI ID = 4.1>

  
Virtually no reaction occurs between the rubber and SO2 losing the period of contact which is suitable for industrial purposes.

  
According to the invention, a thread, tape, film or the like is obtained by first coagulating the latex in known manner, for example by extrusion, in an acid bath. This rubber object

  
 <EMI ID = 5.1>

  
first for a short time in a solution of the desired catalyst and then in a bath containing annyaride sulfur. A

  
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to be miscible with water. As examples of suitable solvents, there may be mentioned methanol, ethanol, ethers, such as dioxane, and ketones, such as acetone.

  
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The starting material can be natural rubber latex or a synthetic rubber capable of forming a profit.

  
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to provide son or similar products by the relative according to the invention, mention may be made of :. for example, polybutadiene,

  
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and copolymers of butadiene, isoprene, methylpentadiene or dimetnyl butadiene with vinyl compounds.

  
Although we have only considered the manufacture of a thread, in the 'examples below, the method according to the invention can be applied, without modification, to the manufacture of bands, tape.

  
 <EMI ID = 11.1>

  
only to the die or nozzle, through which the latex is expelled

  
 <EMI ID = 12.1>

  
molding a coagulum in the form of a strip, tape, film c

  
 <EMI ID = 13.1>

  
Example I. By extrusion in an acid bath is formed

  
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 <EMI ID = 15.1> wire extension takes place during this reaction. A wire is obtained having a sulfur content of 11.1%.

  
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Claims (1)

ABSTRACT. The subject of the invention is improvements to the processes for manufacturing fila, filaments, tapes, films and anal consisting of the reaction product of rubber and sulfur dioxide, which improvements, used separately or in combination, consist in particular: - to obtain the rubber article from latex and to treat it first with a solution containing a catalyst and, then, with sulfur dioxide; - in treating the rubber article with an alcoholic solution of the catalyst and, then, with sulfur dioxide. - and submit the object to an extension following one or <EMI ID = 17.1> sulphurous. The invention relates more particularly to certain modes of application as well as certain embodiments of said improvements; and it relates more particularly still, and as new industrial products, the yarns, filaments, bar tapes, films or similar objects obtained by the processes comprising application of said improvements, the apparatus and special elements suitable for the implementation of these processes, as well as articles and objects made using these wires or anal