Peelable adhesive composition
The invention relates to an adhesive composition comprising at least one natural latex and at least one polymeric composition having a glass transition temperature ranging from −50° C. to 0° C. The invention also relates to a membrane obtained after drying the adhesive composition according to the invention, to a combination of a flexible surface coating with an adhesive composition according to the invention, to a method for applying a flexible surface coating onto a substrate as well as a substrate coated with a peelable adhesive membrane according to the invention.
1. A method for applying a flexible surface coating on a substrate consisting of the successive steps:
a) applying a peelable adhesive composition layer on a surface of the substrate,
b) drying the peelable adhesive composition to obtain a membrane,
c) applying a second adhesive composition, onto the membrane,
d) observing a gumming time ranging from 10 to 30 minutes,
e) displaying the flexible coating on the substrate by contacting the flexible surface coating with the adhesive layer on the surface of the substrate,
wherein said peelable adhesive composition comprises:
i) from 10% to 40% by weight of at least one natural latex,
ii) from 10% to 40% by weight of dry material based on the total weight of the adhesive composition, of at least one polymeric composition having a glass transition temperature ranging from −50° C. to 0° C., said polymeric composition comprising:
(1) a terpolymer of vinyl acetate, of ethylene and of acrylate and a mixture of polyester and polyurethane, and/or
(2) a terpolymer of vinyl acetate, of ethylene and of acrylate,
iii) from 10% to 40% by weight based on the total weight of the adhesive composition, of at least one filler having an apparent density ranging from 1.30 to 1.70,
said substrate being capable of being recovered without any adhesive residues after removal of the peelable film or membrane obtained after drying of the peelable adhesive composition.
2. The method for applying a surface coating according to claim 1 , wherein the amount of applied peelable adhesive composition is greater than or equal to 200 g/m 2 .
3. The method of claim 1 , wherein:
i) the natural latex represents from 15% to 35% by weight of the total weight of the adhesive composition and/or
ii) the polymeric composition represents from 10% to 25% by weight of dry material based on the total weight of the adhesive composition, and/or
iii) the filler(s) represent(s) from 15% to 35% by weight of the total weight of the composition.
4. The method of claim 1 , wherein the peelable adhesive composition further comprises up to 10% by weight of a tackifying resin.
5. The method of claim 1 , wherein the polymeric composition has a glass transition temperature ranging from −40° C. to −10° C.
6. The method of claim 1 , wherein the peelable adhesive composition further comprises fibers.
7. The method of claim 1 wherein the amount of peelable applied adhesive composition is greater than or equal to 250 g/m 2 .
8. The method of claim 1 wherein the amount of peelable applied adhesive composition is greater than or equal to 300 g/m 2 .
9. The method of claim 1 wherein the amount of peelable applied adhesive composition is greater than or equal to 350 g/m 2 .
10. The method of claim 3 wherein tackifying resin is rosin esters, terpene resins, terpene phenol resins or dispersions based on terpene phenol resin.
11. The method of claim 4 wherein the polymeric composition has a glass transition temperature ranging from −37° C. to −15° C.
12. The method of claim 5 wherein fibers are cellulose fibers, glass fibers, rubber fibers, natural fibers, viscose, jute, sisal or synthetic fibers.
13. The method of claim 1 , wherein the substrate is selected from surfaced concretes, cement-based screeds, anhydrite screeds, old tilings, old suitably smoothed parquet flooring, particle panels or plywoods, standard wall claddings.