Process for the protection against corrosion of an article in a wet environment and composition therefore

1. A composition for protection against corrosion in a wet environment comprising:

(i) an amorphous polymer composition comprising an amorphous polymer having a glass transition temperature of −20° C. or less, and

(ii) a water-absorbing filler having a water-absorption of about 20 wt. % or higher as determined according to the procedure described in standard NEN-EN-ISO 10769:2011, wherein the water-absorbing filler comprises a filler that binds water by a chemical reaction and/or a physical reaction,

wherein the composition comprises 20 to 80 wt. % of the amorphous polymer composition, based on the total weight of the composition, and wherein the amorphous polymer has a number average molecular weight Mn between 1,000 to 150,000 g mol −1 ,

wherein the composition has a water-absorption (g/m 2 ), w A (g/m 2 ), of about 600 g/m 2 or higher, wherein W A (g/m 2 ) is determined by:

(1) weighing a cup having a known depth in the range of 15 to 25 mm and a surface with a known diameter (round surface) or a known length and width (rectangular or square surface) in the range of 30 to 50 mm, to obtain mass A;

(2) filling the plastic cup completely with the composition, avoiding air entrapments, and smoothing the surface;

(3) weighing the filled cup to obtain mass B;

(4) placing the filled cup in a container of distilled water maintained at a temperature of 23±1° C., completely submerging the cup;

(5) placing the cup in a climate cabinet and maintaining the water temperature at 23±1° C. for 72 hours;

(6) taking the cup out of the container after 72 hours, drying its surfaces and weighing the dried cup to obtain mass C; and

(7) calculating the water-absorption (g/m 2 ), expressed in g/m 2 , as follows:

w

A

(

g

m

2

)

=

[

(

C

-

A

)

-

(

B

-

A

)

]

surface

⁢

⁢

of

⁢

⁢

cup

*

100

⁢

%

,

and

wherein the water-absorbing filler that binds water by physical interaction is a sodium bentonite clay, a sodium montmorillonite clay, or a combination thereof.

2. The composition according to claim 1 , wherein the composition further comprises (iii) a plasticizer selected from the group consisting of a wax, petrolatum and a mixture thereof.

3. The composition according to claim 1 , wherein the amorphous polymer is selected from the group consisting of:

(a) a polymer comprising about 50.0% to about 98% by weight of isobutene and about 2% to about 50.0% of a C 2 -C 12 alkene other than isobutene, a C 4 -C 12 alkadiene, or a mixture thereof, based on the total weight of the polymer;

(b) a polymer comprising more than about 98% to about 100% by weight of isobutene, based on the total weight of the polymer;

(c) a polymer comprising about 50.0% to about 99.9% by weight of propene and about 0.1% to about 50.0% of a C 2 -C 12 alkene other than propene, a C 4 -C 12 alkadiene, or a mixture thereof, or about 100 wt. % propene, based on the total weight of the polymer;

(d) a polymer comprising about 0.1% to about 50.0% by weight of ethene and about 50.0% to about 99.9% of a C 2 -C 12 alkene other than ethene, a C 4 -C 12 alkadiene, or a mixture thereof, based on the total weight of the polymer;

(e) a polymer comprising about 0.1% to about 50.0% by weight of 2-methyl-1-pentene and about 50.0% to about 99.9% of a C 2 -C 12 alkene other than 2-methyl-1-pentene, a C 4 -C 12 alkadiene, or a mixture thereof, or about 100 wt. % 2-methyl-1-pentene, based on the total weight of the polymer; and

(f) mixtures of (a), (b), (c), (d) and/or (e).

4. The composition according to claim 3 , wherein the amorphous polymer is selected from the group consisting of (a) and (b), and a mixture thereof.

5. A tape, comprising a layer comprising a corrosion protecting composition according to claim 1 .

6. An article, comprising:

(a) a layer of a corrosion protecting composition according to claim 1 , comprising:

(i) an amorphous polymer composition comprising an amorphous polymer having a glass transition temperature of −20° C. or less, and

(ii) a water-absorbing filler, on a surface of the article, and

(b) a mechanical protective layer to protect the layer of the corrosion protecting composition.