BE831573A - PLASTISOLS - Google Patents

Description

       

   <EMI ID = 1.1> <EMI ID = 2.1>

  

 <EMI ID = 3.1>


  
where the R groups, which may be similar or different, are

  
 <EMI ID = 4.1>

  
and diethyl fumarate, vinylidene chloride and fluoride. These plastisols contain plasticizers. Systems containing

  
most expensive plasticizers, which consist mainly of

  
 <EMI ID = 5.1> <EMI ID = 6.1>

  
chlorinated paraffins or plasticizers based on hydrocarbons. These less expensive plasticizers require the use of more soluble foaming agents to obtain good foaming stability. For this purpose, foaming agents containing from 3 to 4% by weight of hydroxyl groups bound to silicon are employed. Formulations containing these less expensive plasticizers and large amounts of filler are in practice the most economically attractive. Unfortunately, foams made from these formulations and containing the aforementioned foaming agents exhibit the inconvenience of an extremely coarse cell structure compared to that of foams made from formulations containing the more expensive plasticizers.

  
The Applicant has now found that this drawback could be overcome by incorporating into the formulation a certain amount of finely divided hydrophobic silica.

  
The present invention therefore relates to plastisols based on polyvinyl chlorides for the manufacture of foams comprising a homopolymer of vinyl chloride or a copolymer of vinyl chloride and in a minor proportion ;, one or more other polymerizable vinyl monomers, a silicone-type foaming agent of general formula

  

 <EMI ID = 7.1>


  
 <EMI ID = 8.1>

  
 <EMI ID = 9.1>

  
of a finely divided hydrophobic silica.

  
Suitable vinyl chloride polymers, plasticizers and fillers for the present invention are those generally employed for such compositions. They can be implemented in <EMI ID = 10.1>

  
 <EMI ID = 11.1> <EMI ID = 12.1> <EMI ID = 13.1>

  
2.second speed for 10 minutes

  
3.First speed (low speed) for 5 minutes (refining stages

  
 <EMI ID = 14.1>

  
At the end of the mixing cycle, the resulting mousse was poured into a bowl of known volume, the excess being skimmed off and the specific weight of the ungelled moussa (ungelled p) calculated from the weight of a known volume of the foam.

  
The rest of the mousse was poured into an aluminum mold of approx.

  
 <EMI ID = 15.1>

  
the mold was removed from the oven and cooled to room temperature. The foam was removed from this mold and the dry density measured by weighing a

  
 <EMI ID = 16.1>

  
the foam sample examined for cell structure

  
 <EMI ID = 17.1> <EMI ID = 18.1>

  

 <EMI ID = 19.1>


  
 <EMI ID = 20.1>

  
 <EMI ID = 21.1>
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  <EMI ID = 23.1>
 <EMI ID = 24.1>
  <EMI ID = 25.1>

  
 <EMI ID = 26.1>

  
these ;, as described in Example 5 using formulation!, except that the amount of hydrophobic silica is varied. Table 3 below gives the properties of the foams and the amount of silica used.

  
TABLE 3
 <EMI ID = 27.1>
  <EMI ID = 28.1>

  
 <EMI ID = 29.1>

  

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 <EMI ID = 31.1>

  

 <EMI ID = 32.1>
 

  
 <EMI ID = 33.1>

  

 <EMI ID = 34.1>


  
 <EMI ID = 35.1>

  
 <EMI ID = 36.1>


    

Claims (1)

<EMI ID = 37.1> <EMI ID = 38.1> characterized in that the hydrophcbe silica is used 3 because of <EMI ID = 39.1>