BITUMINOUS COATING COMPOSITIONS

Abstract

Aqueous coating compositions and methods for making and used for the same. The method includes providing 75 to 97 weight percent of bitumen (solid) and 3 to 20 weight percent of vinyl acetate-ethylene copolymers, wherein each is based on the dry weight of the bituminous coating compositions. Mixing the bitumen, the one or more vinyl acetate-ethylene copolymers and optionally one or more additives. Where the bitumen and/or the vinyl acetate-ethylene copolymers are applied in the form of aqueous dispersions. Where the one or more vinyl acetate-ethylene copolymers are based on ≥50 weight percent, based on the total weight of the vinyl acetate-ethylene copolymers, of vinyl acetate and ≥90 weight percent, based on the total weight of the vinyl acetate-ethylene copolymers, of vinyl acetate and ethylene.

Claims

1-10. (canceled)

11. Method for preparing aqueous coating compositions, comprising the steps of: providing 75 to 97 weight percent of bitumen (solid) and 3 to 20 weight percent of vinyl acetate-ethylene copolymers, wherein each is based on the dry weight of the bituminous coating compositions; mixing the bitumen, the one or more vinyl acetate-ethylene copolymers and optionally one or more additives, wherein the bitumen and/or the vinyl acetate-ethylene copolymers are applied in the form of aqueous dispersions, wherein the one or more vinyl acetate-ethylene copolymers are based on ≥50 weight percent, based on the total weight of the vinyl acetate-ethylene copolymers, of vinyl acetate and ≥90 weight percent, based on the total weight of the vinyl acetate-ethylene copolymers, of vinyl acetate and ethylene.

12. The method of claim 1, wherein the aqueous coating compositions contain 75 to 95 weight percent of bitumen (solid), based on the dry weight of the aqueous coating compositions.

13. The method of claim 1, wherein the aqueous coating compositions contain 3 to 15 weight percent of vinyl acetate-ethylene copolymers, based on the dry weight of the aqueous coating compositions.

14. The method of claim 1, wherein the total amount of bitumen (dry) and vinyl acetate-ethylene copolymers contained in the aqueous coating compositions is 80 to 99.5 weight percent, based on the dry weight of the aqueous coating compositions.

15. The method of claim 1, wherein the vinyl acetate-ethylene copolymers are based on 60 to 95 weight percent of vinyl acetate, based on the total weight of the vinyl acetate-ethylene copolymers.

16. The method of claim 1, wherein the vinyl acetate-ethylene copolymers are based on 5 to 40 weight percent of ethylene, based on the total weight of the vinyl acetate-ethylene copolymers.

17. The method of claim 1, wherein the vinyl acetate-ethylene copolymers are based on 95 weight percent of vinyl acetate and ethylene, based on the total weight of the vinyl acetate-ethylene copolymers.

18. The method of claim 1, wherein the vinyl acetate-ethylene copolymers are stabilized by one or more protective colloids.

19. The method of claim 1, wherein the aqueous coating compositions are used as coating agents for roofings, wall surfaces, water pipes, basements, foundations, paper or cardboard for moisture resistant packaging, lumber for building construction or steel surfaces as a corrosion barrier or for preparing sound deadening coatings, bitumen paints or waterproofing or sealing materials.

Description

INVENTIVE EXAMPLE 1 (IEX. 1)

[0051] 18.18 parts by weight of an aqueous dispersion of a polyvinyl alcohol stabilized copolymer based on 80 wt. % vinyl acetate and 20 wt. % ethylene (solids content: 55%) were applied.

COMPARATIVE EXAMPLE 2 (CEX. 2)

[0052] 15.15 parts by weight of an aqueous dispersion of a styrenebutadiene-rubber having a glass transition temperature of −51° C. and a solids content of 66% were applied.

COMPARATIVE EXAMPLE 3 (CEX. 3)

[0053] 20.62 parts by weight of an aqueous dispersion of a styrenebutadiene-rubber having a glass transition temperature of −5° C. and a solids content of 48.5% were applied.

Performance Testing

Drying:

[0054] The bituminous coating composition of the respective Example 1˜3 was applied to a concrete substrate with a roller at 23° C. and 50% relative humidity and dried under these conditions. The time to formation of a dry and non-tacky bitumen coating was determined by finger testing and is given in Table 2 for all (Comparative) Examples.

Elongation:

[0055] The bituminous coating composition of the respective Example 1-3 was given into a silicone mold. After drying for 48 hours, the obtained coating had thickness of 2 mm and was taken from the mold and cut into test panels of 10 cm length and 0.5 cm width.

[0056] The elongation of the panels was determined according to DIN EN ISO 527-1 using Zwick/Roell Z010 with 500N loadcell, the instron test device Model 4501, a test rate of 50 mm/min and a distance between the jaws of 115 mm.

[0057] The entire test including the preparation of the bituminous coating composition and the test panel as well as the elongation test was performed at 23° C. and 50% relative humidity.

[0058] This test was repeated with two further samples.

[0059] The average of the test results is given in Table 2.

Elastic Recovery:

[0060] The bituminous coating composition of the respective Example 1-3 was given into a silicone mold. After drying for 48 hours, the obtained coating had thickness of 2 mm and was taken from the mold and cut into test panels of 10 cm length and 0.5 cm width.

[0061] The test panel was elongated manually to 20 cm.

[0062] Afterwards, the samples were released and after 3 min the length of the test panel was determined.

[0063] The entire test including the preparation of the bituminous coating composition and the test panel as well as the test for elastic recovery was performed at 23° C. and 50% relative humidity.

[0064] The elastic recovery is the quotient of the determined length of the test panel before the test and the length of the test panel after the test.

[0065] This test was repeated with two further samples.

[0066] The average of the test results is given in Table 2.

TABLE-US-00002 TABLE 2 Test results: IEx. 1 CEx. 2 CEx. 3 drying [min] 27 34 31 elongation [%] 1350 1400 350 elastic recovery [%] 70.0 53.7 66.7