Adhesive composition comprising lightened fillers
The present invention relates to an adhesive composition comprising a polymer composition, lightened fillers, carbonate fillers; and a tackifying resin, and also to its use for applying a flexible surface covering to a substrate and to a corresponding bonding process.
1 . An adhesive composition, for applying a flexible surface covering to a substrate, comprising, relative to the total weight of the adhesive composition:
from 10% to 40% by weight of solids of a polymer composition comprising at least one copolymer or a mixture of at least two polymers comprising at least one (meth)acrylate or (meth)acrylic monomer;
from 0.075% to 1.5% by weight of solids of at least one lightened filler having a bulk density of less than or equal to 0.1 g/cm 3 ;
optionally at least a second lightened filler having a bulk density of greater than 0.1 g/cm 3 and less than or equal to 0.95 g/cm 3 ;
from 15% to 60% by weight of at least one carbonate filler; and
from 6% to 30% by weight of at least one tackifying resin.
2 . The adhesive composition as claimed in claim 1 , comprising from 15% to 35% by weight of solids, of the polymer composition.
3 . The adhesive composition as claimed in claim 1 , in which the polymer composition comprises from 35% to 70% by weight of a copolymer or a mixture of at least two polymers comprising at least one (meth)acrylate or (meth)acrylic monomer, relative to the total weight of the polymer composition.
4 . The adhesive composition as claimed in claim 1 , in which the lightened fillers are hollow, nonporous, water-dispersible microspheres having a mean particle size (D50) of from 1 to 100 μm.
5 . The adhesive composition as claimed in claim 1 , in which the lightened fillers having a bulk density of less than or equal to 0.1 g/cm 3 are hollow microspheres obtained from a thermoplastic material.
6 . The adhesive composition as claimed in claim 1 , in which the second lightened fillers, having a bulk density of greater than 0.1 g/cm 3 and less than or equal to 0.95 g/cm 3 , are hollow microspheres obtained from silica glass.
7 . The adhesive composition as claimed in claim 1 , in which the tackifying resin is chosen from rosins or modified derivatives of rosins, wherein the modified derivatives of rosins comprise hydrogenated rosins, dimerized rosins, polymerized rosins or esterified derivatives of rosins with monoalcohols or polyols.
8 . The adhesive composition as claimed in claim 1 , in which the carbonate filler has a bulk density of greater than 0.95 g/cm 3 .
9 . The adhesive composition as claimed in claim 1 , in which the carbonate filler is chosen from alkali metal or alkaline-earth metal carbonates.
10 . The adhesive composition as claimed in claim 1 , comprising a mass ratio of the lightened fillers to the total fillers of from 1:100 to 15:100.
11 . The adhesive composition as claimed in claim 1 , further comprising a thickener, a plasticizer, a solvent, a pigment, a moisture absorber, a UV stabilizer, a dispersant, a molecular sieve, an antifoam, a fluorescent material, a biocide, or mixtures thereof.
12 . The adhesive composition as claimed in claim 1 , having a viscosity of from 10 000 mPa·s to 45 000 mPa·s.
13 . A process for applying a flexible surface covering to a substrate, comprising the following steps:
applying a layer of the adhesive composition, as claimed in claim 1 , to the substrate and/or the flexible surface covering; and
applying the flexible surface covering to the substrate.
14 . The process for applying a flexible surface covering to a substrate as claimed in claim 13 , in which an amount of the adhesive composition of less than or equal to 290 g/m 2 is applied.
15 . The adhesive composition as claimed in claim 1 , comprising at least a second lightened filler having a bulk density of greater than 0.1 g/cm 3 and less than or equal to 0.95 g/cm 3 .