Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-12-15
1994-01-25
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...
525106, 528 14, 528 25, C08F29500, C08C 1925
Patent
active
052816664
ABSTRACT:
The present invention is an improvement upon the process for making block copolymers of vinyl aromatic hydrocarbons and/or conjugated dienes, and polydimethylsiloxane by first anionically polymerizing the vinyl aromatic hydrocarbon to make a living polymer block and then adding hexamethylcyclotrisiloxane and a polar promoter to polymerize a polydimethylsiloxane block at the end of the living polymer block. The improvement comprises reacting the living polymer blocks with a crossover reagent to decrease the crossover time from the living polymer block polymerization to the polydimethylsiloxane polymerization.
REFERENCES:
patent: 3051684 (1962-08-01), Morton et al.
patent: 3483270 (1969-12-01), Bostick
patent: 3665052 (1972-05-01), Saam et al.
patent: 3691257 (1972-09-01), Kendrick
patent: 3760030 (1973-09-01), Dean
patent: 3928490 (1975-12-01), Hergenrother
patent: 4143089 (1979-03-01), Martin
patent: 4148838 (1979-04-01), Martin
patent: 4263401 (1981-04-01), Chaumont et al.
patent: 4273896 (1981-06-01), Martin
patent: 4768750 (1990-11-01), Eichenauer et al.
Polymer Letters, vol. 8 pp. 677-679, 1970.
J. C. Saam, D. J. Gordon, S. Lindsey, Macromolecules, 3 (1), pp. 1-4 (1970).
I. Jansen, G. Lohmann, K. Ruhlmann, Siloxanes with Functional Groups. V. Long-term Stabilization of Polymers. I. Preparation and Properties of Styrene-Siloxane Block Copolymers, Plaste Kautsch, 31(12), pp. 441-447.
P. Bajaj, S. K. Varshney, A. Misra, Block Copolymers of Polystyrene and Poly(Dimethyl Siloxne). I. Synthesis and Characterization, J. of Poly. Sci.: Polymer Chem. Ed., vol. 18, (1980) pp. 295-309.
Dean Ralph H.
Haas Donald F.
Shell Oil Company
LandOfFree
Process for making block copolymers of vinyl aromatic hydrocarbo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for making block copolymers of vinyl aromatic hydrocarbo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for making block copolymers of vinyl aromatic hydrocarbo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-728404