Polymer modified bitumen compositions
AssigneeKraton Polymers U.S. LLC
InventorsKeith E. Stephens, Robert Q. Kluttz, Dale L. Handlin JR., Carl L. Willis
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Abstract
The present invention is a polymer modified bituminous composition having improved phase stability, heat aging and viscosity characteristics. The bituminous compositions are blends comprising bitumen and from about 0.5 to about 25% of a novel anionic block copolymer where one of the blocks is a controlled distribution copolymer of a conjugated diene and a mono-alkenyl arene having a specific arrangement of the monomers in the copolymer block. The composition of the invention is useful for paving, roofing felts, water-proof membrane, adhesive, mopping asphalt, carpet backing and pipe coating applications.
Claims33
A bituminous composition comprising:
- I) from about 75 percent to about 99.5 percent bitumen;
- and
- II) from about 0.5 percent to about 25 percent weight of a block copolymer having at least one A block and at least one B block wherein:
- a) each A block is a mono-alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono-alkenyl arene;
- b) each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;
- c) each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono-alkenyl arene units;
- d) the total amount of mono-alkenyl arene in the block copolymer is about 20 percent weight to about 80 percent weight;
- and
- e) the weight percent of mono-alkenyl arene in each B block is between about 10 percent and about 75 percent.
A bituminous composition comprising:
- I) from about 75 percent to about 99.5 percent bitumen;
- and
- II) from about 0.5 percent to about 25 percent weight of an unhydrogenated block copolymer having at least one A block and at least one B block wherein:
- a) each A block is a mono-alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono-alkenyl arene;
- b) each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;
- c) each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono-alkenyl arene units;
- d) the total amount of mono-alkenyl arene in the block copolymer is about 20 percent weight to about 80 percent weight;
- and
- e) the weight percent of mono-alkenyl arene in each B block is between about 10 percent and about 75 percent.
A bituminous composition comprising:
- I) from about 75 percent to about 99.5 percent bitumen;
- and
- II) from about 0.5 percent to about 25 percent weight of a hydrogenated block copolymer having at least one A block and at least one B block wherein:
- a) each A block is a mono-alkenyl arene homopolymer block and each B block is a controlled distribution copolymer block of at least one conjugated diene and at least one mono-alkenyl arene;
- b) each A block having a number average molecular weight between about 3,000 and about 60,000 and each B block having a number average molecular weight between about 30,000 and about 300,000;
- c) each B block comprises terminal regions adjacent to the A blocks that are rich in conjugated diene units and one or more regions not adjacent to the A blocks that are rich in mono-alkenyl arene units;
- d) the total amount of mono-alkenyl arene in the block copolymer is about 20 percent weight to about 80 percent weight;
- and
- e) the weight percent of mono-alkenyl arene in each B block is between about 10 percent and about 75 percent.
Dependencies are inferred from the claim text.