Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1981-06-29
1982-05-18
Marquis, Melvyn I.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
C08L 9500
Patent
active
043304494
ABSTRACT:
A method of preparation of polymer-asphalt (bitumen) compositions which comprises mixing, with agitation, at a temperature of 130.degree. to 230.degree. C., 80 to 98% by weight of an asphalt having a penetration between 30 to 220, and 2 to 20% by weight of a polyblock copolymer of a styrene-carboxylated conjugated diene having a mean molecular weight of 30,000 to 300,000, and maintaining this mixture for at least 2 hours at this temperature, then adding 0.1 to 3% of elemental sulfur, based on the asphalt, while maintaining the same conditions of agitation and temperature for at least 20 minutes, the carboxylated conjugated diene sequence being selected from the group consisting of carboxylated polybutadiene and carboxylated polyisoprene.
REFERENCES:
patent: 4129542 (1978-12-01), Matheson et al.
patent: 4130516 (1978-12-01), Gagle et al.
patent: 4145322 (1979-03-01), Maldonado et al.
patent: 4237052 (1980-12-01), Fitoussi et al.
patent: 4248749 (1981-02-01), Hayashi et al.
Eber Daniele
Maldonado Paul
Phung Trung Kiet
ELF France
Marquis Melvyn I.
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