Plasticized coal tar pitch, composition containing same and its use
AssigneeRutgerswerke Aktiengesellschaft
InventorsHeinrich Louis, Helmut Kohler, Rudolf Oberkobusch, Gerd Collin, Volker Potschka
Life of this patent
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Abstract
This invention relates to a plasticized coal tar pitch comprising a mixture consisting essentially of about 50 to about 80 weight percent of a coal tar pitch having a softening point of about 40.degree. to about 75.degree. C. (Kramer-Sarnow); and about 50 to about 20 weight percent of a coal tar fraction rich in crystals and having a boiling point of about 350.degree. C. to about 450.degree. C. The mixture is suitable for blending with crude oil bitumen for producing a binder suitable for application to roadways.
Claims13
A plasticized coal tar pitch comprising a mixture consisting essentially of
- (A) about 50 to about 80 weight percent of a coal tar pitch having a softening point of about 40.degree. to about 75.degree. C. (Kramer-Sarnow);
- and
- (B) about 50 to about 20 weight percent of a coal tar fraction rich in crystals having a boiling point whereby at least 60% of said fraction is distilled between about 350.degree. C. and about 450.degree. C. and a crystallization point of about 70.degree. C. or above;
- wherein said mixture is suitable for mixing with crude oil bitumen B 45, B 25 or B 15, (according to German Industrial Standard 1995) in a weight ratio of about 20 to about 35 parts by weight of said mixture to about 80 to about 65 parts by weight of said bitumen.
A plasticized coal tar pitch comprising a mixture consisting essentially of
- (A) about 50 to about 80 weight percent of a coal tar pitch having a softening point of about 40.degree. to about 75.degree. (Kramer-Sarnow);
- and
- (B) about 50 to about 20 weight percent of a coal tar fraction rich in crystals having a boiling point whereby at least 60% of said fraction is distilled between about 350.degree. C. and about 450.degree. C. and a crystallization point of about 70.degree. C. or above;
- wherein said mixture is capable of being blended with a crude oil bitumen B 45, B 25 or B 15 (according to German Industrial Standard 1995) in a weight ratio of about 20 to about 35 parts by weight of said mixture to about 80 to about 65 parts by weight of said bitumen to form a first composition having Marshall-stability greater than a second composition consisting of crude oil bitumen B 65 (according to German Industrial Standard 1995).
Dependencies are inferred from the claim text.