Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1980-05-15
1982-02-09
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...
525 99, 525237, 525316, C08F27902, C08F27904, C08L 5104
Patent
active
043150837
ABSTRACT:
The present invention relates to an improved process for the continuous mass polymerization of solutions comprising alkenyl aromatic monomers having about 1 to 10% by weight of a polybutadiene rubber dissolved therein, the steps comprising, (A) continuously charging said solution to a first reaction zone operating at about 10 to 40% conversion forming a first partially polymerized mixture, (B) continuously charging said first mixture to a second reaction zone operating at about 50-90% conversion forming a second partially polymerized mixture, and finally, (C) separating the residual monomer from said second mixture providing a polyblend of a matrix phase of said monomers having polybutadiene rubber particles grafted with said monomers dispersed therein, the improvement comprising: charging a monomer-polybutadiene solution in step (A) having in addition about 1 to 10% by weight of a diene block copolymer and about 1 to 20% by weight of a polymer of said monomers dissolved in said solution followed by carrying out steps (B) and (C) to provide a polyblend of a polymer of said monomers having dispersed therein rubber particles grafted with said monomers, said rubber particles containing said polybutadiene and diene block copolymer rubbers and forming a gel phase of said rubber particles containing grafted and occluded polymers of said monomers in an amount of about 0.5 to 5 parts per part of total rubber.
REFERENCES:
patent: 3658946 (1972-04-01), Bronstent et al.
patent: 3660535 (1972-05-01), Finch et al.
patent: 3676527 (1972-07-01), Babcock et al.
patent: 3903202 (1975-09-01), Carter et al.
patent: 3907939 (1975-09-01), Durst
patent: 4146589 (1979-03-01), Dupre
patent: 4252911 (1981-02-01), Simon
Farrington William J.
Hamrock William F.
Matukaitis Paul D.
Monsanto Company
Nelson Joseph S.
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