Claims
- 1. A latex which is particularly useful for modifying asphalt cements which is comprised of water, an emulsifier and a rubbery polymer which is comprised of repeat units which are derived from (a) about 71 weight percent to about 81.5 weight percent of 1,3-butadiene monomer, (b) about 18 weight percent to about 26 weight percent of styrene, (c) about 0.3 weight percent to about 1 weight percent of N-(isobutoxymethyl) acrylamide and (d) about 0.2 weight percent to about 2 weight percent hydroxypropyl methacrylate; wherein said latex has a solids content which is within the range of about 30 weight percent to about 75 weight percent.
- 2. A latex as specified in claim 1 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 0.5:1 to about 4:1.
- 3. A latex as specified in claim 2 wherein the rubbery polymer is comprised of repeat units which are derived from about 71.7 weight percent to about 81 weight percent of 1,3-butadiene monomer, from about 18 weight percent to about 26 weight percent of styrene monomers, from about 0.4 weight percent to 0.8 weight percent N-isobutoxymethyl acrylamide, and from about 0.6 weight percent to about 1.5 weight percent hydroxypropyl methacrylate.
- 4. A latex as specified in claim 1 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 1:1 to about 3:1.
- 5. A latex as specified in claim 4 wherein the latex has a solids content which is within the range of about 50 percent and about 70 percent.
- 6. A latex as specified in claim 5 wherein the weight ratio of hydroxypropyl methacrylate to N-(isobutoxymethyl) acrylamide is within the range of about 5:4 to about 7:4.
- 7. A latex as specified in claim 6 wherein the rubbery polymer has a Mooney viscosity which is within the range of about 35 to about 80.
Parent Case Info
This is a Divisional of application Ser. No. 08/386,779, filed on Feb. 10, 1995, now U.S. Pat. No. 5,534,568.
US Referenced Citations (9)
Divisions (1)
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Number |
Date |
Country |
Parent |
386779 |
Feb 1995 |
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