In-situ stabilized compositions
OwnerSimon Hesp, Zhizhong Liang +1inventors
InventorsSimon Hesp, Zhizhong Liang, Raymond T. Woodhams
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Abstract
Insoluble particulate materials, which may be in solid or liquid form, are dispersed in a continuous non-aqueous phase and the dispersion rendered stable and resistant to phase separation by an in-situ stabilization procedure involving the formation of chemical bonds among the stabilizer components and to dispersed phases to form a network surrounding the particles which is compatible with the continuous phase. The invent ion has particular application for the formation of stabilized polyolefin-modified bitumen compositions for paving and other applications.
Claims23
A stable bituminous composition, comprising:
- a continuous non-aqueous liquid phase which is bitumen,
- a dispersed particulate phase of organic material insoluble in said liquid phase Which is an olefinic polymer,
- a steric stabilizer in the form of an envelope surrounding and anchored to each particle in said particulate phase and composed of a plurality of elements each comprising a first individual component which is an olefinic polymer component and a second individual component different from said first individual component which is a polydiene component, said second individual component being bonded to said first individual component by interaction of functional groups provided on said first and second components,
- said steric stabilizing component comprising a cross-linked structure compatible with said liquid phase to maintain dispersed particles of said particulate phase spaced from each other in said liquid phase, so as to inhibit separation of said particulate phase from said liquid phase by progressive coalescence of dispersed particles.
A composition for forming a stable dispersion of particulate olefinic polymer in a continuous liquid phase of bitumen, comprising:
- a pro-steric stabilizer dissolved in a bitumen-compatible component,
- said pro-steric stabilizer comprising:
- a liquid phase-compatible stabilizer segment comprising a functionalized polydiene bonded to an olefinic polymer-compatible stabilizer segment comprising a functionalized olefinic polymer by interaction of the respective functional groups.
A bituminous composition for forming a stable dispersion of olefinic particles in a bitumen, comprising:
- bitumen,
- a bitumen-compatible polymer comprising a functionalized polydiene,
- an olefinic polymeric material comprising a functionalized homopolymer or copolymer of ethylene,
- said bitumen-compatible polymer and said olefinic polymeric material being bonded together by interaction between the respective functional groups to form a molecule dissolved in said bitumen.
A method of forming a stable bituminous composition, which comprises:
- dispersing an olefinic polymer in bitumen at an elevated temperature above the melting point of the olefinic polymer to form a dispersion containing small particles of said olefinic polymers in the presence of steric stabilization forming components comprising a first individual component comprising a functionalized olefinic polymer component compatible with said olefinic polymer particles for anchoring to said olefinic polymer particles and a second individual component comprising a functionalized polydiene soluble in said bitumen, and
- effecting chemical bonding between the respective functional groups on said steric stabilizer forming components and bonding to said olefinic polymer particles to form a steric stabilizer in the form of an envelope surrounding and anchored to each said olefinic polymer particle and comprising a cross-linked structure compatible with the bitumen to maintain said olefinic polymer particles spaced apart from each other in said bitumen.
A method of forming a bituminous composition, which comprises:
- dissolving a functionalized diene in bitumen,
- dispersing a functionalized olefinic polymer in said bitumen, and
- reacting said functionalized olefinic polymer and said functionalized diene so as to bind one end of said olefinic polymer to said diene by interaction of the functional groups.
A method of forming a stable dispersion of polyethylene particles in bitumen, which comprises:
- dispersing a polyethylene having a molten point of about 115.degree. to about 130.degree. C. in the homogenous bituminous composition of claim 20 at a temperature of about to about 190.degree. C. and above the melting point of the polyethylene to form liquid droplets of said polyethylene in said bitumen.
A stable bituminous composition, comprising:
- a continuous non-aqueous liquid phase which is bitumen,
- a dispersed particulate phase of organic material which is polyethylene, and
- a steric stabilizer in the form of an envelope surrounding and anchored to each particle in said particulate phase and composed of a plurality of elements each comprising a first individual component which is a functionalized polyethylene and second individual component different from said first individual component which is a functionalized polydiene bonded to said functionalized polyethylene by interaction of the functional groups,
- said steric stabilizer comprising a cross-linked structure compatible with said liquid phase to maintain dispersed particles of said particulate phase spaced from each other in said liquid phase, so as to inhibit separation of said particulate phase from said liquid phase by progressive coalescence of dispersed particles.
Dependencies are inferred from the claim text.