Pulverulent mortar composition having improved adhesion

Abstract

Pulverulent mortar composition comprising a mineral binder, an inert material in the form of aggregate capable of being agglomerated in aqueous phase by means of said binder, and 0.2 to 1% of a fluid additive comprising 25 to 100% of a linear or branched, saturated or unsaturated hydrocarbon compound (i) which is liquid at room temperature and which includes one or more —COO— ester groups, the total weight of which, relative to the molar mass of said compound, is between 20 and 50%. Use for preparing an adhesive mortar for fixing ceramic tiles.

1 . A pulverulent mortar composition which comprises:
 from 10% to 60% of an inorganic binder,   from 40% to 90% of an inert material in granule form that can be agglomerated in aqueous phase by means of said binder,   from 0.2% to 1% of a fluid additive comprising from 25% to 100% of a saturated or unsaturated, linear or branched hydrocarbon compound (i) which is liquid at ambient temperature and which includes one or more ester groups —COO— of which the total weight, relative to the molar mass of said compound (i), is between 20% and 50%.   
     
     
         2 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that cement is used as inorganic binder and sand is used as granules of inert material. 
     
     
         3 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that the compound (i) is a mono-, di-, tri- or tetra-ester. 
     
     
         4 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that the compound (i) is selected from the group consisting of:
 (a) mono-esters of formula:
   R 1 —A—R 2   (I)
 
   
       in which:
 R 1  and R 2  are identical or different and represent a saturated or unsaturated, linear or branched hydrocarbon radical which contains from 1 to 10 carbon atoms and is optionally substituted by an —OH or —SH group; 
 A represents an ester group of formula —(CO)O— or —O(CO)—; 
 (b) di-esters of formula:
   R 3 —A 1 —R 4 —A 2 —R 5   (II)
 
 
 
       in which:
 R 3  and R 5  are identical or different and represent a saturated or unsaturated, linear or branched hydrocarbon radical which contains from 1 to 20 carbon atoms and is optionally substituted by an —OH or —SH group; 
 R 4  is a divalent radical deriving from the monovalent radical having the same meaning as radicals R 3  or R 5  defined above; 
 A l  and A 2  are identical or different and have the same meaning as the radical A defined above; 
 (c) tri-esters obtained by condensing:
 a saturated or unsaturated, linear or branched carboxylic acid which contains from 2 to 20 carbon atoms and is optionally substituted by an —OH or —SH group, with 
 a saturated or unsaturated, linear or branched hydrocarbon compound which contains from 3 to 10 carbon atoms, of which 3 separate atoms are each bonded to an —OH group; and 
 
 (d) tetra-esters obtained by condensing:
 a saturated or unsaturated, linear or branched carboxylic acid which contains from 2 to 20 carbon atoms and is optionally substituted by an —OH or —SH group, with 
 a saturated or unsaturated, linear or branched hydrocarbon compound which contains from 4 to 10 carbon atoms, of which 4 separate atoms are each bonded to an —OH group. 
 
 
     
     
         5 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that the polar organic compound (i) includes one or more ester groups for a total weight of between 30% and 50%. 
     
     
         6 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that the fluid additive further comprises from 0% to 75% of an apolar organic compound (ii) which is liquid at ambient temperature. 
     
     
         7 . The pulverulent mortar composition as claimed in  claim 6 , characterized in that the compound (ii) is selected from mineral oils, paraffinic oils, polyolefins, or mixtures of these substances. 
     
     
         8 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that it comprises from 20% to 40% of the inorganic binder and from 60% to 70% of the inert material in granule form. 
     
     
         9 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that it comprises the fluid additive at from 0.3% to 0.6%. 
     
     
         10 . The pulverulent mortar composition as claimed in  claim 1 , characterized in that it further comprises, as organic binder, from 1% to 10% of a copolymer comprising one (or more) vinyl ester(s). 
     
     
         11 . The pulverulent mortar composition as claimed in  claim 10 , characterized in that the organic binder is a copolymer of vinyl acetate, vinyl versatate, and maleic ester, present at from 5% to 6%. 
     
     
         12 . A process for producing a mortar, a spackling, a wall coating, a grout, a cement-based product used in construction or an adhesive mortar for fixing ceramic tiles, comprising mixing water and a mortar composition according to  claim 1 . 
     
     
         13 . (canceled) 
     
     
         14 . A mortar, spackling, wall coating, grout, cement-based product, or adhesive mortar comprising a mortar composition according to  claim 1 .