Aqueous rubberized coal tar emulsion

Claim 2

An aqueous rubberized coal tar emulsion coating composition for application to a paved asphalt surface and the like consisting essentially of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion and from about 1 to about 20 percent by volume of an acid copolymer latex emulsion based on the volume of the coal tar emulsion, wherein said copolymer contains at least about 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated carboxylic acid or mixtures thereof to form the acid copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 Ångstroms, all moieties of the acid copolymer latex emulsion based on the weight of the copolymer, whereby said composition is characterized by a thixotropic nature.

Claim 3

The coating composition of claim 1 in which the acid copolymer latex contains from about 50 to about 90 percent by weight butadiene, from about 49 to about 9 percent by weight styrene, and from about 1 to about 5 percent by weight of an olefinic unsaturated carboxylic acid, and mixtures thereof.

Claim 4

The coating composition of claim 1 in which the latex copolymer emulsion ranges from about 2 to about 20 percent by volume of the coal tar emulsion content.

Claim 5

The coating composition of claim 1 in which the average particle size of the acid copolymer latex emulsion is from about 600 to about 1200 Ångstroms.

Claim 6

The coating composition of claim 1 further containing sand having a particle size range such that all sand passes through a U.S. Standard No. 20 mesh square screen and wherein 50 percent by weight of the sand passes through a U.S. Standard No. 30 mesh square screen, with no more than 2 weight percent passing through a U.S. Standard No. 100 mesh square screen.

Claim 7

The composition of claim 1 in which said polymerizable ethylenically unsaturated carboxylic acid is a monocarboxylic acid or mixtures thereof.

Claim 8

The composition of claim 6 in which the ethylenically unsaturated monocarboxylic acid is methacrylic acid.

Claim 9

The composition of claim 6 in which the ethylenically unsaturated monocarboxylic acid is acrylic acid.

Claim 10

The composition of claim 6 in which the ethylenically unsaturated monocarboxylic acid is crotonic acid.

Claim 11

The composition of claim 6 in which the ethylenically unsaturated monocarboxylic acid is a mixture of methacrylic acid and acrylic acid.

Claim 12

The composition of claim 1 in which said polymerizable ethylenically unsaturated carboxylic acid is a polycarboxylic acid or mixtures thereof.

Claim 13

The composition of claim 11 in which the ethylenically unsaturated polycarboxylic acid is fumaric acid.

Claim 14

The composition of claim 11 in which the ethylenically unsaturated polycarboxylic acid is itaconic acid.

Claim 15

The composition of claim 11 in which the ethylenically unsaturated polycarboxylic acid is a mixture of fumaric acid and itaconic acid.

Claim 16

The composition of claim 1 in which the ethylenically unsaturated carboxylic acid is a mixture of monocarboxylic and polycarboxylic ethylenically unsaturated acids.

Claim 17

The composition of claim 15 in which the ethylenically unsaturated carboxylic acid is a mixture of methacrylic acid and fumaric acid.

Claim 18

A thixotropic rubberized coal-tar-containing composition for coating asphalt pavements and the like consisting essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion and from about 1 to about 20 percent by volume of an acid copolymer latex emulsion based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the said copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 Ångstroms, all moieties of the acid copolymer based on the weight of the copolymer, and sand being present in the amount of between 0.5 and about 20 pounds per gallon of said standard coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby after mixing, a thixotropic composition is formed that retains sufficient thixotropicity to retard significant settling of the sand homogeneously mixed to form the rubberized coal-tar-containing composition.

Claim 19

A thixotropic rubberized coal-tar-containing composition for coating asphalt pavements and the like consisting essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion and from about 1 to about 20 percent by volume of an acid copolymer latex emulsion based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the said copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 Ångstroms, all moieties of the acid copolymer based on the weight of the copolymer, and sand being present in the amount of between 0.5 and about 20 pounds per gallon of said standard coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby after mixing, a thixotropic composition is formed that retains sufficient thixotropicity to retard significant settling of the sand homogeneously mixed to form the rubberized coal-tar-containing composition.

Claim 20

The composition of claim 17 in which the latex contains from about 50 to about 90 percent by weight butadiene, from about 49 to about 9 percent by weight styrene, and from about 1 to about 5 percent by weight of an olefinic unsaturated carboxylic acid, and mixtures thereof.

Claim 21

The composition of claim 17 in which the latex copolymer emulsion ranges from about 2 to about 20 percent by volume of the coal tar emulsion.

Claim 22

The composition of claim 17 in which the average particle size of the emulsion is from 600 to 2000 Ångstroms.

Claim 23

The composition of claim 17 in which the sand has a particle size range such that all sand passes through a U.S. Standard No. 20 mesh square screen and wherein 50 percent by weight of the sand passes through a U.S. Standard No. 30 mesh square screen, with no more than 2 weight percent passing through a U.S. Standard No. 100 mesh square screen.

Claim 24

The composition of claim 17 in which said polymerizable ethylenically unsaturated carboxylic acid is a monocarboxylic acid or mixtures thereof.

Claim 25

The composition of claim 22 in which the ethylenically unsaturated monocarboxylic acid is methacrylic acid.

Claim 26

The composition of claim 22 in which the ethylenically unsaturated monocarboxylic acid is acrylic acid.

Claim 27

The composition of claim 22 in which the ethylenically unsaturated monocarboxylic acid is crotonic acid.

Claim 28

The composition of claim 22 in which the ethylenically unsaturated monocarboxylic acid is a mixture of methacrylic acid and acrylic acid.

Claim 29

The composition of claim 17 in which the ethylenically unsaturated carboxylic acid is a mixture of monocarboxylic and polycarboxylic ethylenically unsaturated acids.

Claim 30

The composition of claim 17 in which said polymerizable ethylenically unsaturated carboxylic acid is a polycarboxylic acid or mixtures thereof.

Claim 31

The composition of claim 28 in which the ethylenically unsaturated polycarboxylic acid is fumaric acid.

Claim 32

The composition of claim 28 in which the ethylenically unsaturated polycarboxylic acid is itaconic acid.

Claim 33

The composition of claim 28 in which the ethylenically unsaturated polycarboxylic acid is a mixture of fumaric acid and itaconic acid.

Claim 34

The composition of claim 28 in which the ethylenically unsaturated polycarboxylic acid is a mixture of fumaric acid and methacrylic acid.

Claim 35

The aqueous rubberized coal tar emulsion coating composition of claim 1 which contains homogeneously mixed therein an aggregate, said aggregate being present in the amount of between 0.5 and about 20 pounds per gallon of said standard coal tar emulsion.

Claim 36

An improved paved asphalt surface and the like, which is prepared by applying a thin coating of a thixotropic composition that consists essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion, from about 1 to about 12 percent by weight of a latex emulsion copolymer based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the acid copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 Ångstroms, all moieties of the copolymer based on the weight of the copolymer latex emulsion, and sand being present in the amount of between 0.5 to about 20 pounds per gallon of said conventional coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby said dried coating presents a hard durable surface on the surface of the paved asphalt.

Claim 37

An improved paved asphalt surface and the like, which is prepared by applying a thin coating of a thixotropic composition that consists essentially of a mixture of a standard coal tar emulsion containing about 40 to about 60 percent water based on the volume of the coal tar emulsion, from about 1 to about 12 percent by weight of a latex emulsion copolymer based on the volume of the coal tar emulsion, wherein said copolymer contains at least 50 percent by weight of a combination of butadiene and styrene, and up to about 20 percent by weight of at least one polymerizable ethylenically unsaturated monomer containing at least one carboxylic acid group or mixtures thereof to form the acid copolymer latex, said acid copolymer latex emulsion having an average latex particle size of from about 400 to about 2000 Ångstroms, all moieties of the copolymer based on the weight of the copolymer latex emulsion, and sand being present in the amount of between 0.5 to about 20 pounds per gallon of said conventional coal tar emulsion, the ratio of water to coal tar emulsion being about 1 to about 1, whereby said dried coating presents a hard durable surface on the surface of the paved asphalt.