PROCESS AND ADDITIVE TO IMPROVE ADHESION OF BUILDING COMPOSITIONS TO SUBSTRATES

摘要

The present invention relates to the use of an additive as well as a process to improve the adhesion of a mortar to a building substrate, wherein the mortar is mixed with said additive and is applied to a building substrate selected from the group of polystyrene-containing substrates, polyolefin-containing substrates or polyvinyl chloride-containing substrates, the additive containing (i) a plasticizer that is liquid at 50°C or lower, has a boiling point of 100°C or higher, and that has a solubility parameter d at 25°C between 22.5 MPa1/2 and 11 MPa1/2; (ii) optionally, a filler that has a BET surface area of at least 40 m2/g; (iii) optionally, a biopolymer; (iv) optionally, a protective colloid; and (v) optionally, a water-insoluble film-forming (co)polymer based on ethylenically unsaturated monomers. The invention also covers an additive and a kit of parts suitable for use in the above process.