Polymer-modified asphalt composition and process for the preparation thereof
AssigneeChevron Research and Technology Company, a Division of Chevron U.S.A. Inc.
InventorJoseph L. Goodrich
Life of this patent
Estimating the term…
Abstract
A polymer-modified asphalt composition containing (a) about 80 to 99.7 weight percent of a polymer-asphalt reaction product prepared by reacting (i) about 100 parts by weight of an asphalt having an initial viscosity at 60.degree. C. of from 100 to 20,000 poise, with (ii) about 0.5 to 11 parts by weight a glycidyl-containing ethylene copolymer containing about 0.1 to about 20 weight percent glycidyl moieties and having a weight-average molecular weight of from about 10,000 to about 1,000,000; and (b) about 0.3 to 20 weight percent of a styrene/conjugated-diene block copolymer having a weight-average molecular weight of from about 100,000 to about 1,000,000.
Claims53
A polymer-modified asphalt composition comprising:
- (a) about 80 to 99.7 weight percent of a polymer-asphalt reaction product prepared by reacting (i) about 100 parts by weight of an asphalt having an initial viscosity at 60.degree. C. of from 100 to 20,000 poise, with (ii) about 0.5 to 11 parts by weight of a glycidyl-containing ethylene copolymer containing about 0.1 to about 20 weight percent glycidyl moieties and having a weight-average molecular weight of from about 10,000 to about 1,000,000;
- and
- (b) about 0.3 to 20 weight percent of a styrene/conjugated-diene block copolymer having a weight-average molecular weight of from about 100,000 to about 1,000,000.
An aggregate composition comprising aggregate and from about 3 to about 15 weight percent of a polymer-modified asphalt composition comprising:
- (a) about 80 to 99.7 weight percent of a polymer-asphalt reaction product prepared by reacting (i) about 100 parts by weight of an asphalt having an initial viscosity at 60.degree. C. of from 100 to 20,000 poise, with (ii) about 0.5 to 11 parts by weight of a glycidyl-containing ethylene copolymer containing about 0.1 to about 20 weight percent glycidyl moieties and having a weight-average molecular weight of from about 10,000 to about 1,000,000;
- and
- (b) about 0.3 to 20 weight percent of a styrene/conjugated-diene block copolymer having a weight-average molecular weight of from about 100,000 to about 1,000,000.
A process for preparing a polymer-modified asphalt composition, said process comprising:
- (a) forming a reaction mixture comprising:
- (i) 70 to 99.2 weight percent of an asphalt having an initial viscosity at 60.degree. C. of from about 100 to about 20,000 poise,
- (ii) about 0.5 to 10 weight percent of a glycidyl-containing ethylene copolymer containing about 0.1 to about 20 weight percent glycidyl moieties and having a weight-average molecular weight of from about 10,000 to about 1,000,000, and
- (iii) about 0.3 to 20 weight percent of a styrene/conjugated-diene block copolymer having a weight-average molecular weight of from about 100,000 to about 1,000,000;
- and
- (b) mixing said reaction mixture for a time and at a temperature sufficient to cause substantially complete reaction of said asphalt with the glycidyl moieties of said glycidyl-containing ethylene copolymer.
A process for preparing a polymer-modified asphalt composition, said process comprising:
- (a) forming a reaction mixture comprising:
- (i) about 90 to 99.5 weight percent of an asphalt having an initial viscosity at 60.degree. C. of from about 100 to about 20,000 poise, and
- (ii) about 0.5 to 10 weight percent of a glycidyl-containing ethylene copolymer containing about 0.1 to about 20 weight percent glycidyl moieties and having a weight-average molecular weight of from about 10,000 to about 1,000,000;
- (b) mixing said reaction mixture for a time and at a temperature sufficient to cause substantially complete reaction of said asphalt with the glycidyl moieties of said glycidyl-containing ethylene copolymer;
- and
- (c) blending about 0.3 to 25 parts by weight of a styrene/conjugated-diene copolymer block having a weight-average molecular weight of from about 100,000 to about 1,000,000, with about 100 parts by weight of the reaction product from step (b) above.
Dependencies are inferred from the claim text.