USOO6616743B1
(12) United States Patent (10) Patent No.: US 6,616,743 B1
Yap et al. (45) Date of Patent: Sep. 9, 2003
(54) AQUEOUSEMULSIONS, WITH BENTONITE (56) References Cited
FOR COLD APPLICATION BITUMEN U.S. PATENT DOCUMENTS
(75) Inventors: Michael L. Yap, Oldsmar, FL (US); 4.279,547 A 7/1981 Clem ......................... 405/208
Raymond T. Hyer, Tampa, FL (US); 4,404,108 A 9/1983 Cates ......................... 507/106
Barton J. Malina, Tampa, FL (US) 5,368,692 A 11/1994 Derrick ................... 162/181.8
5,840,105 A 11/1998 Helmstetter .............. 106/18.12
(73) Assignee: Gardner Asphalt Corporation, Tampa, 5,860,772 A 1/1999 Starita et al. ............... 405/270
FL (US) 5,970,893 A 10/1999 Starita et al. .................. 112/2
6,019,830 A * 2/2000 Yap et al. ................... 106/277
(*) Notice: Subject to any disclaimer, the term of this * cited by examiner
patent is extended or adjusted under 35 Primary Examiner David Brunsman
U.S.C. 154(b) by 0 days. y
(74) Attorney, Agent, or Firm-Holland & Knight LLP
(21) Appl. No.: 09/887,383 (57) ABSTRACT
(22) Filed: Jun. 22, 2001 Compositions of an aqueous emulsion of a bitumen and a
drilling mud bentonite are especially adapted for cold appli
(51) Int. Cl." .............................................. C09D 195700 cation and provide many advantages.
(52) U.S. Cl. ................ ... 106/277; 507/126
(58) Field of Search ........................... 106/277; 507/126 4 Claims, No Drawings
US 6,616,743 B1
1 2
AQUEOUSEMULSIONS, WITH BENTONITE and conform in general to specification outlined by RT-10
FOR COLD APPLICATION BITUMEN (Road tar-10) RT-11 and RT-12 in ASTM D490.
BACKGROUND OF THE INVENTION
The coal tar can be utilized in the form of an aqueous
emulsion readily available in the trade (see Federal Speci
1. Field of the Invention fication RP355e) and thus has a maximum water content of
about 53 wt.%.
The use of bitumens (i.e., asphalt and cold tar) for roofing
and other applications is well known. The advantage of cold
applicability, e.g. on flat roofs So as to avoid working with At least one of asphalt and coal tar are employed, depend
a hot material at a job Site is also well known. It is desirable ing on desired final product.
to achieve improved formulations to increase the economy
of the effort and improve the properties of the treated Subject to the foregoing, the ranges of components are
materials. about:
2. Description of the Background Art 15
U.S. Pat. No. 5,840,105 discloses the use of bentonite
from drilling muds for Sodium Silicate and fine mica coat wt.% of
ings. U.S. Pat. No. 5,970,893 discloses clay liners as barriers Emulsion
for the containment of pollutants or toxic waste. Bitumen 5-50
SUMMARY OF THE INVENTION Asphalt and/or Coal tar 5-50
Drilling Mud Bentonite 3-8
It has now been found that aqueous emulsions of Specific Water
Specialty Additives
15-55
0.1-2
drilling mud bentonite with bitumen provide formulations
that have markedly decreased costs and markedly improved 25
properties for cold application. It is Surprising to find that
this specialty bentonite provides Such Superior results out The Specialty additives include e.g. mineral Salt to
Side the petroleum drilling mud field. increase emulsability; complex organic acids Such as acetic
DETAILED DESCRIPTION OF THE acid etc. to bring the pH to a range of 4-6, also to enhance
PREFERRED EMBODIMENT emulsability, and polymerS Singly or in combination for a
Similar purpose, e.g. acrylic, Vinyl polystyrene, etc.
The drilling bentonite mud conform to American Petro
leum Institute (API) specification 13A which yield approxi Inert fillerS Such as pulverized limestone powder, talc,
mately 120 to 280 barrels of 15 centiposes mud per ton, perlite, etc., can be used in an amount of about 0 to 50, wt.
preferably about 180 to 240 barrels per ton. Typical bento 35 %.
nites with their trademarks Hydraul-EZ, KWIK-THIK and
Super-Gel-X.
Asphalt is a bitumen derived from a number of materials Inert fiberS Such as cellulosic, asbestos, fiberglass,
Such as, for example, petroleum, Shale oil, gilsonite and the polyolefin, etc. can be used in an amount of from about 0-25
wt.%.
like. Asphalt is a thick, Viscous mixture of compounds Such 40
as, for example, paraffinic, cycloaliphatic and aromatic
hydrocarbon and lesser amounts of heterocylic compound It should be noted that the amount of water listed above
containing Sulfur, nitrogen or oxygen. Although asphalt can is in addition to that derived from asphalt and cold tar
be obtained from natural Sources, it is primarily derived as aqueous emulsions employed.
the residue of petroleum distillation (e.g., the bottom prod 45
uct of a vacuum distillation of a topped crude). Although this The process of producing the aqueous emulsified bitu
invention is not limited thereto, it is preferred that the mens are as follows:
asphalt have a penetration (ASTM D5) at 77 degrees F.
dmm: ranging from about 5 to about 300 dmm and more 1. 3%-5% bentonite is added into water in the mixer.
preferably from about 50 to about 200 dmm and conform in 50 When dispersed after mixing, it turns into a slurry. The
general to specification outlined by ASTM D312, D946 slurry temperature between 60-120 degrees Fahrenheit
and/or D449. is preferred.
The asphalt can be utilized in the form of an aqueous
emulsion readily available in the trade, see ASTM D1227, 2. The bitumens (asphalt coal tar or both) are heated to
and thus has a water content of about 40-60 wt.%. 55 250-350 degree Fahrenheit.
Coal tar is a bitumen derived from crude coal tar, water 3. The slurry and bitumen is then combined into a mixture
gas tar, oil gas tar or from combination of Such tars with their of emulsified bitumen through proceSS Such as dispers
constituents. Coal tar is a black, Viscous, naphthalene-like ing type (batch to batch) or colloid mill type
odor, amorphous residue mainly from distillation of coal. (continuous) System.
The majority of its composition is polynuclear aromatic 60 The specifications of emulsified asphalt meet ASTM D
compounds Such a aromatic hydrocarbon, naphthalenic, 1227, Standard Specification for Emulsified Asphalt Used as
phenolic, anthracenic, quinolinic compound with trace of Protective Coating for Roofing. The Specifications of emul
insoluble materials. Different grades have different float sified coal tar meets ASTM D5727 Standard Specification
tests and Softening points. Although this invention is not for Emulsified Refined Coal Tar and ASTM D3320 Standard
constrained to, the preferred coal tars have a float test at 122 65 Specification for Emulsified Coal-Tar Pitch.
degrees F., seconds: ranging from about 75 to bout 230 This invention will be better understood by reference to
seconds and more preferably from about 180 to 220 seconds the following examples:
US 6,616,743 B1
3 4
EXAMPLE 1. EXAMPLE 5
The Preparation of Emulsified Asphalt Using Asphalt Emulsion Roofing Composition.
Bentonite Slurry With AC-250 Type Asphalt 5
% By weight
% By weight Example 1 or 2 20-60
Reinforced Fibers 0.5-10
Water 51.O 1O Fillers/Extenders 1.0-20
Drilling Mud Bentonite 1.5-2.5 Water O.O-20
AC-20 Asphalt (115 deg. F. melting point) 46.3-47.3 Specialty Additives 0.1-10
Ph Adjuster O.2
1OO.O
15 EXAMPLE 6
Asphalt Emulsion Reflective Aluminum
EXAMPLE 2 Composition
The Preparation of Emulsified Asphalt Using 2O
Bentonite Slurry With PPA Hard Asphalt. % By weight
Example 1, 2 or 3 20-60
Special treated aluminum paste 5-15
Fillers/Extenders 2-20
% By weight as Water 3-2O
Water 51.O Specialty additives 0.2-5
Drilling Mud Bentonite Slurry 2.5-3.5
Hard PPA Asphalt (185 deg. F. melting point) 45.3-46.3
Ph Adjuster O.2
o EXAMPLE 7
1OO.O 3O
Bituminous Black Top Driveway Sealers
EXAMPLE 3
35 % By weight
Preparation of Emulsified Coal Tar Using Bentonite Example 1 to 4 15-50
Slurr Fillers/Extenders 2-20
y. Sand 0.5-20
Water 10-40
40 Specialty Additives 0.2-5
% By weight
Water 52.0 EXAMPLE 8
Drilling Mud Bentonite 7.0
CoalT 41.O
Oa a 45 Bituminous Patching Compound
1OO.O
% By weight
EXAMPLE 4 50 Example 1 to 4 SO-8O
Fillers/Extenders 5-15
Fibers 1-5
Preparation of Emulsified Asphalt. Using Polymer(s) Water 1-10
Added Asphalt and Bentonite Slurry. Specialty Additives 0.2-2.0
55
% By weight E PLE 9
Water 52.0 Bituminous Bonding Adhesives
Drilling Mud Bentonite 2.5-3.5
Asphalt with Polymer(s) 44.3-45.3 60
Ph Adjusters O.2
1OO.O % By weight
Example 1 to 4 30-60
Adhesive Enhancer Polymer Resins 1-20
-- - - 65 Water 1-10
The following examples employ the drilling mud bento- Fillers/Extenders 2-10
nite and bitumen of preceding examples.
US 6,616,743 B1
6
despite high glass transition temperature; no water Sensitive
-continued Surface active agents needed; Superior binding and wetting
% By weight
of pigments, fibers and fillers, non porous, harder films, no
Setting or Separation in package; excellent wetting of Sub
Fibers O.5-5 Strate and adhesion to old Substrates, easier more uniform
Specialty Additives 0.2-5 application due to their thixotropic nature, fast dry; Superior
color wetness); Superior hydrophobic nature, Superior abra
Sion resistance, Superior “track” resistance (less Softening
EXAMPLE 10 when hot); much longer useful life and weather resistance;
presents good Sealed Surface for recoat when necessary.
Bituminous Roof Mastic For economy of operation and ease of use, the composi
tions are transported and usually marketed as concentrates.
They can then be diluted with other materials for related
% By weight 15
applications. The methods of application are well-known
and need not be elaborated here.
Example 1 to 4 40-70
Bituminous Cutback Solvent O-30 The present disclosure includes that contained in the
Fillers/Extenders 2-20 appended claims, as well as that of the foregoing descrip
Specialty Additives 0.5-30 tion. Although this invention has been described in its
preferred form with a certain degree of particularity, it is
understood that the present disclosure of the preferred form
EXAMPLE 11 has been made only by way of example and that numerous
changes in the details of construction and the combination
Bituminous Waterproofer or Vapor Barriers and arrangement of parts may be resorted to without depart
25 ing from the Spirit and Scope of the invention.
Now that the invention has been described,
% By weight What is claimed is:
Example 1 to 4 70-90
1. A colloidal aqueous emulsion of a bitumen and a
Wax Emulsion 0-15 drilling mud bentonite composition especially adapted for
Silicon Emulsion 0-15 cold application,
Water 0-10
Specialty Additives 0.1-5 wherein the drilling mud bentonite conforms to API
Specification 13A.
2. The emulsion of claim 1 in which the bentonite yields
EXAMPLE 12 35 about 180 to 240 barrels per ton.
3. The emulsion of claim 2 in which the bitumen is at least
Primer/Weed Controller/Road Dust Suppressor one of asphalt or coal tar.
4. The emulsion of claim 3 in which the range of com
ponents are about:
40
% By weight
Example 1 to 4 10-50 Wt. 2% of Emulsion
Water 10-60
Surface Active Additives O.3-3 Bitumen 5-50
Specialty Additives 0.1-6 Bentonite 3-8O
45 Water 15-55
Specialty Additives 0.1-2.
The advantages of this invention will be apparent to the
skilled in the art higher Solids emulsions, higher melt point
when using harder asphalts; no coalescing Solvent needed
UNITED STATES PATENT AND TRADEMARK OFFICE
CERTIFICATE OF CORRECTION
PATENT NO. : 6,616,743 B1 Page 1 of 1
DATED : September 9, 2003
INVENTOR(S) : Michael L. Yap et al.
It is certified that error appears in the above-identified patent and that said Letters Patent is
hereby corrected as shown below:
Column 1
Line 8, delete “(i.e., asphalt and cold tar) and insert -- (i.e., asphalt and coal tar) --.
Line 31, delete “conform' and insert -- conforms --.
Line 32, delete "yield” and insert -- yields --.
Line 66, delete “to bout 230' and insert -- to about 230 --.
Column 2
Line 20, delete “Bitumen” and insert -- Bitumen (Asphalt and/or Coal Tar) --.
Line 21, delete “Asphalt and/or Coal tar 5-50'.
Line 22, delete “3-8” and insert -- 3-80 --.
Line 43, delete “and cold tar' and insert -- and/or coal tar --.
Line 53, delete “bitumens (asphalt coal tar or both)” and insert -- bitument (asphalt, coal
tar or both) --.
Column 3
Line 5, delete “AC-250' and insert -- AC-20 --.
Column 5
Line 31, delete “Silicon' and insert -- Silicone --.
Column 6
Line 7, delete “color wetness” and insert -- color jetness --.
Signed and Sealed this
Sixth Day of January, 2004
JAMES E ROGAN
Director of the United States Patent and Trademark Office
