Bituminous composite elements

Abstract

The invention relates to composite elements which have the following layer structure: (i) from 2 to 20 mm of metal, plastic or wood, (ii) from 10 to 300 mm of mixture comprising bitumen, (iii) from 2 to 20 mm of metal, plastic or wood.

We claim:  
     
         1 . A composite element which has the following layer structure: 
 (i) from 2 to 20 mm of metal, plastic or wood,    (ii) from 10 to 300 mm of mixture comprising bitumen,    (iii) from 2 to 20 mm of metal, plastic or wood.    
     
     
         2 . A composite element as claimed in  claim 1  comprising, as (ii), bitumen in a mixture with inorganic fillers and/or with plastics.  
     
     
         3 . A composite element as claimed in  claim 1 , comprising, as (ii), bitumen in a mixture with SBS, SBR, SIS, EPDM, polyolefins, ethylene-butyl acrylate, ethylene-vinyl acetate and/or ethylene-methyl acrylate.  
     
     
         4 . A composite element as claimed in  claim 1 , comprising bitumen to DIN 55 946 Part 1 with needle penetration to DIN 52 010 of from 0.1 to 80 mm.  
     
     
         5 . A composite element as claimed in  claim 4 , comprising bitumen with a softening point to DIN 52011 of at least 50° C.  
     
     
         6 . A composite element as claimed in  claim 1 , comprising bitumen with a content of from 8 to 30% of asphaltenes.  
     
     
         7 . A composite element as claimed in  claim 1 , comprising oxidized bitumen.  
     
     
         8 . A process for producing composite elements as claimed in  claim 1 , which comprises introducing a mixture comprising molten or softened bitumen between the layers (i) and (iii).  
     
     
         9 . A process for producing composite elements as claimed in  claim 1 , which comprises applying molten or softened (ii) to the surface of (i) and then securing (iii) to the molten or softened (ii).  
     
     
         10 . A process for producing composite elements as claimed in  claim 1 , which comprises adhesively bonding (ii) to (i) and (iii).  
     
     
         11 . A ship or an item of civil engineeering work comprising composite elements as claimed in any of  claims 1  to  7 .