Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-08-12
1994-01-04
Dean, Ralph H.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525474, 528 15, 528 25, 528 26, 528 27, 528 31, 528 35, C08F28300
Patent
active
052761100
ABSTRACT:
A carbosilane-based hybrid star polymer having a carbosilane core of large size and addition polymer chains emanating from the core, is described. The carbosilane core is formed from a central silane nucleus and built up by repeated alternating hydrosilylation of reactive vinylic sites followed by vinylation of silicon halide reactive sites. The core is reacted with living addition prepolymers to form the hybrid star polymer. The minimum core size to give the desired properties corresponds to that having at least about 48 reactive silicon halide sites on the periphery. These highly regular hybrid star polymers have unique solution and gelling agent properties and form highly structured and rigid gels, and also act as viscosity modifiers. The large carbosilane core having either vinyl or silicon halide reactive sites can be used as a reactive intermediate.
REFERENCES:
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patent: 5132375 (1992-07-01), Satori et al.
Macromolecules 1980 vol. 13 pp. 191-193 N. Hadjichristidis et al, Star Branched Polymers, 4. Synthesis of 18-Arm Polyisoprenes.
Macromolecules 1989 vol. 22 pp. 1897-1903 J. Roovers et al, Synthesis and Characterization of Multiarm Star Polybutadienes.
Angew. Chem. Int. Ed. Engl. 1990 vol. 29 pp. 138-175 D. A. Tomalia et al, Starburst Dendrimers.
Macromolecules 1992 vol. 25 pp. 5561-5572 Y. H. Kim et al, Hyperbranched Polyphenylenes.
Roovers Jacques
Toporowski Paul M.
Zhou Lin-Lin
Dean Ralph H.
National Research Council of Canada
Thomson Alan A.
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