Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-02-13
1993-07-06
Ziegler, Jacob
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525268, 525272, C08F 416, C08F29300, C08F 5300
Patent
active
052254925
ABSTRACT:
The synthesis of poly(isobutylene-b-methyl vinyl ether) (PIB-b-PMeVE) by living carbocationic polymerization (LC.sym.Pzn) employing the sequential monomer addition (SMA) technique is described. The process starts by producing the living PIB.sym. block employing the 2-chloro-2,4,4-trimethylpentane (TMPC11/TiCl.sub.4 initiating system in the presence of the common ion salt tetra-n-butylammonium chloride (n-Bu.sub.4 NCl) in CH.sub.3 Cl
-C.sub.6 H.sub.14 or CH.sub.2 Cl.sub.2
-C.sub.6 H.sub.14 mixed solvents at -80.degree. C. and continues by the addition of methyl vinyl ether (MeVE). The second living block forms only in the presence of excess TiCl.sub.4 suggesting that the species that starts the second block and subsequently sustains its growth is a MeVE.multidot.TiCl.sub.4 complex. The stoichiometry of this complex (1:1 or 1:2) is uncertain. The TiCl.sub.4 remains attached to the MeVE units after their incorporation into the diblock, however, it can be readily removed by water. PMeVE obtained in the presence of excess TiCl.sub.4 degrades by dealcoholation, however, degradation is prevented by the use of n-Bu.sub.4 NCl. Various length (composition) diblocks have been prepared and characterized. The novel PIB-b-PmeVE's exhibit strongly amphiphilic character.
REFERENCES:
patent: 4835220 (1989-05-01), Bronstert et al.
Ivan Bela
Kennedy Joseph F.
Pernecker Tibor
The University of Akron
Ziegler Jacob
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