Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Reexamination Certificate
2007-02-20
2007-02-20
Teskin, Fred (Department: 1713)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
C526S082000, C526S084000, C526S173000, C526S204000, C526S912000
Reexamination Certificate
active
10550567
ABSTRACT:
The invention relates to a process for the preparation of poly(α-methylstyrene) by anionic polymerization of the α-methylstyrene monomer, said process successively comprising the following stages:a) a stage of preparation of a solution comprising the α-methylstyrene monomer and a nonpolar aprotic solvent;b) a stage of neutralization of the solution prepared in a) comprising the addition, to this solution, of an effective amount of at least one monofunctional organometallic initiator, so as to neutralize the proton sources of the solution prepared in a);c) a stage of cooling the solution obtained in b) to a temperature of less than 0° C.;d) a stage of initiation of the polymerization comprising the addition, to the cooled solution in c), of a predetermined amount of said monofunctional initiator;e) a stage of propagation of the polymerization comprising the addition, to the solution obtained in d), of a polar aprotic solvent, said solvent being added in an amount which is lower than that of the nonpolar aprotic solvent;f) a stage of termination comprising the addition, to the solution prepared in e), of a polar protic solvent.
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Mitsuo, Abe et al., “Dilute Solution Properties of Monodisperse Poly(α-methyl styrene)”,Bulletin of the Chemical Society of Japan, vol. 41, pp. 2330-2336 (1968).
McCormick, Herbert W., “Molecular Weight Distribution of Anionically Polymerized α-Methylstyrene”, Journal Of Polymer Science, vol. XLI, pp. 327-331 (1959).
Tsunashima, Yoshisuke, et al., “On the Anionic Preparation of Poly (α-methyl styrene)”,Bull. Inst. Chem. Res., Kyoto Univ.,vol. 46, No. 2, pp. 37-47 (1968).
Balland-Longeau Alexia
Calonne Marc
Catala Jean-Marie
Jousse Franck
Commissariat A L'Energie Atomique
Teskin Fred
Thelen Reid Brown Raysman & Steiner LLP
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