Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1977-03-14
1979-05-22
Michl, Paul R.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
526228, C08F27902
Patent
active
041559568
ABSTRACT:
The process for producing shock-proof graft copolymers of styrene with synthetic rubber consists in that rubber is dissolved in styrene at a maximum temperature of 75.degree. C. The resultant solution is subjected to prepolymerization by being heated to 75-85.degree. C. in the presence of a plasticizer and a peroxide initiating agent. The peroxide initiator is essentially a composition of the following formulation (in parts by weight): diacylated peroxides of aliphatic acids C.sub.3 -C.sub.5, 2 to 8; diacylated peroxides of aliphatic acids C.sub.6 -C.sub.9, 80 to 89; diacylated peroxides of aliphatic acids C.sub.10 -C.sub.12, 7 to 14. The prepolymerization process proceeds until the 25-40 percent styrene conversion. The result is the prepolymer which is exposed to aqueous-suspension polymerization by being heated in an aqueous medium to maximum 140.degree. C. at a prepolymer-to-water volume ratio ranging within 5:3 and 10:3, respectively, in the presence of peroxide polymerization; initiators and a stabilizing system, consisting of 0.15-1.5 wt. % tricalcium phosphate, 0.003-0.02 wt. % of a mixture of disubstituted sodium alkylsulphates of a general formula as such: R--OSO.sub.3 Na, where R is a hydrocarbon radical, containing 8 to 18 carbon atoms, and 0.15-0.35 wt. % calcium carbonate.
The process is distinguished for a simple flowsheet; it involves no molecular-weight modifier. Copolymers produced according to the proposed process feature high physico-mechanical characteristics.
REFERENCES:
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patent: 2792423 (1957-05-01), Young
patent: 3671651 (1972-06-01), D'Angelo
patent: 3919355 (1975-11-01), Ballova
patent: 3991109 (1976-11-01), D'Angelo
Ballova Galina
Egorova Ekaterina I.
Ivanchev Sergei S.
Karmakova Valentina G.
Maladzyanova Larisa F.
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