Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1979-05-30
1981-02-24
Hamrock, William F.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
260 35, 260 237A, 260 237H, 260 237M, 260 308R, 260 324, 260 326A, 260 332R, 525192, 525241, 525354, 525358, C08F 820, C08F 822
Patent
active
042529182
ABSTRACT:
When an elastomeric copolymer of a C.sub.4 or C.sub.5 conjugated diene and an aromatic vinyl compound is brominated in latex while keeping the uniformity of the latex until the amount of bormine combined with the copolymer reaches 0.5-15% by weight, the resulting brominated conjugated diene-aromatic vinyl compound rubber contains 3-80% by weight of a toluene-insoluble fraction formed by the bromination and has a high green strength and a good processability. A vulcanized rubber obtained from said brominated rubber has a high modulus of elasticity and a high tensile strength. When an anionic surfactant is used as an emulsifier, the uniformity of the above-mentioned latex can be kept by adjusting the pH value of the bromination reaction system to 9 or highter, preferably 10 or higher, during the reaction or by auxiliarily adding a nonionic surfactant. When a cationic or nonionic surfactant is used as an emulsifier, regulation of pH is unnecessary.
REFERENCES:
patent: 3039977 (1962-06-01), Ingram
patent: 3050476 (1962-08-01), Tress et al.
patent: 3691262 (1972-09-01), Hagerman
patent: 4026933 (1977-05-01), Edwards
Chem. Abstracts 85:P6609g, 3-1976, Chiba et al.
Chem. Abstracts 84:60904s, Kuramochi et al, 10-1975.
Chemical & Process Technology Encyclopedia, Considine, E., pp. 387-390, (1974) McGraw-Hill.
Goto Kohei
Ikeda Hiroharu
Shimozato Yasuyuki
Hamrock William F.
Japan Synthetic Rubber Co. Ltd.
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