Claims
- 1. A sealant composition for sealing leaks in gas transmission or distribution pipes comprising an aqueous anionic or non-ionic emulsion of bitumen and rubber containing an anionic or non-ionic emulsifier in which emulsion is incorporated a flow modifier comprising a colloidal stabilizer selected from the group consisting of casein, methyl cellulose, hydroxyethyl cellulose and polymers and copolymers of acrylic acid and salts or esters of polyacrylic acid alone or in conjunction with bentonite clay or china clay and a modifier selected from the group consisting of fillers and soluble alkali wherein the rubber and bitumen content of the emulsion is at least 50% by weight of the total solids content of the sealant, the total solids content of the sealant is from 30 - 72% by weight, the apparent viscosity of the emulsion is not greater than 500 poise at a shear rate of one reciprocal second and the concentration of flow modifier is such that the yield stress of the sealant ranges from 100 to 500 dynes/cm.sup.2.
- 2. A sealant as claimed in claim 1, wherein the disperse phase of the emulsion is a rubber latex.
- 3. A sealant as claimed in claim 1, wherein the disperse phase of the emulsion is a solution of rubber in bitumen.
- 4. A sealant as claimed in claim 1, wherein the bitumen has a penetration value of 12 450 dmm at 25.degree. C.
- 5. A sealant as claimed in claim 1, wherein the rubber is selected from the group consisting of neoprene, styrenebutadiene rubber and natural rubber.
- 6. A sealant as claimed in claim 5, wherein the weight of rubber in the emulsion ranges from 20 - 30% by weight of the total weight of rubber and bitumen.
- 7. A sealant as claimed in claim 1, wherein said filler is a dispersed clay or powdered mica.
- 8. A sealant as claimed in claim 7, wherein said filler is present in an amount of up to 50% of the total solids.
- 9. A sealant as claimed in claim 1, wherein the flow modifier is selected from the group consisting of methyl cellulose, hydroxyethyl-cellulose, polyacrylic acids, esters of polyacrylic acid, salts of polyacrylic acid and co-polymers of acrylic acid.
- 10. A sealant as claimed in claim 1, wherein the emulsion contains an emulsifying agent.
- 11. As sealant as claimed in claim 10, wherein the emulsifying agent is selected from the group consisting of hectorite clays resin soaps and tall oil soaps.
- 12. A sealant as claimed in claim 1, wherein potassium hydroxide is employed as a soluble alkali material.
Priority Claims (1)
Number |
Date |
Country |
Kind |
44845/73 |
Sep 1973 |
GBX |
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Parent Case Info
This is a continuation-in-part application of parent application Ser. No. 507,620, filed Sept. 19, 1974 and now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3027342 |
Kemp et al. |
Mar 1962 |
|
3296165 |
Kemp |
Jan 1967 |
|
Non-Patent Literature Citations (1)
Entry |
Ott et al., High Polymers (vol. 5), Cellulose (Part 2), Interscience Publ., N.Y. pp. 930, 945 and 946, (1954). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
507620 |
Sep 1974 |
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