Coal tar pitch modified by nitrile butadiene rubber
AssigneeThe Garland Company, Inc.
InventorJoseph W. Mellott
Life of this patent
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Abstract
A modified coal tar pitch useful in roofing applications, containing coal tar pitch, and a nitrile butadiene rubber, is blended by heating the coal tar pitch to a molten temperature, adding the rubber in powder form and agitating the material in a suitable high shear mixing apparatus until adequate phase inversion occurs between the polymer and the coal tar phase. After preparation, the material is cooled in containers until use, at which time it is heated to a flowable temperature and applied using a roofing mop or squeegee.
Claims10
A modified coal tar pitch consisting essentially of:
- a coal tar pitch having a softening point in the range of from about 52.degree. C. to about 64.degree. C.;
- and
- a solid-phase nitrile butadiene rubber ("NBR");
- wherein the coal tar pitch and the NBR are blended;
- and
- wherein the coal tar pitch is present in the range of from about 80 to about 96% by weight and the NBR is present in the range of from about 20 to about 4% by weight.
A process for manufacturing a modified coal tar pitch, comprising:
- a) heating a coal tar pitch having a softening point in the range of from about 52.degree. C. to about 64.degree. C. to a temperature at which the coal tar pitch is molten and comprises a continuous phase;
- b) adding a solid-phase nitrile butadiene rubber ("NBR") as a disperse phase to the molten coal tar pitch to form a molten blend having a coal tar continuous phase;
- and
- c) agitating the molten blend until a phase inversion occurs and the NBR component is the continuous phase of the blend.
Dependencies are inferred from the claim text.