Chemistry of carbon compounds – Miscellaneous organic carbon compounds
Patent
1972-10-27
1976-04-06
Schofer, Joseph L.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
260 336A, 260 342, 260880B, C08K 501, C08L 906
Patent
active
039488462
ABSTRACT:
A dispersion is described of block copolymer particles in a saturated aliphatic hydrocarbon diluent, the block copolymer consisting of a thermoplastic tertiary butyl styrene polymer block A of molecular weight 10,000-100,000 which is soluble in the diluent, an elastomeric conjugated diene polymer block B of molecular weight 1,000-100,000 which is terminally attached to block A, and a styrene homopolymer or copolymer block C of molecular weight 20,000-1,000,000 which is terminally attached to block B, is insoluble in the diluent and forms at least part of the core of the particles. The particles may be separated from the diluent while retaining their previous molecular organization, i.e. with the insoluble block C present in the core of the particles and the thermoplastic block A remote from the core, and may be converted by hot pressing into shaped articles having impact resistance. A process is also described for producing such a particle dispersion by anionic polymerization of monomers in the hydrocarbon diluent to form successively the polymer blocks A, B and C.
REFERENCES:
patent: 3264234 (1966-08-01), Osmond
patent: 3441530 (1969-04-01), Bauer
patent: 3567798 (1971-03-01), Haefele et al.
patent: 3621077 (1971-11-01), Donat
patent: 3725505 (1973-04-01), O'Malley
patent: 3726824 (1973-04-01), Saunders
patent: 3734978 (1973-05-01), Schwab
patent: 3770712 (1973-11-01), Schwab
Imperial Chemical Industries Limited
Schofer Joseph L.
Tungol Maria S.
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