Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Mixing of two or more solid polymers; mixing of solid...
Patent
1992-09-03
1995-02-21
Seidleck, James J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Mixing of two or more solid polymers; mixing of solid...
525271, 525299, C08F29702, C08F29900
Patent
active
053916280
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to functionalized multiblock macromonomers containing at least one (meth)acrylic sequence, and to a process for their production.
Triblock copolymers combining alkyl methacrylate blocks of different types are already known. Thus, Polymer Preprints 29(1), pages 343-345, describes triblock copolymers (tert-butyl methacrylate-b-2-ethylhexyl methacrylate-b-tert-butyl methacrylate) obtained by anionic polymerization in tetrahydrofuran at -78.degree. C. in the presence of a difunctional initiator. Block copolymers which are able to contain up to 20% by weight of tert-butyl methacrylate but which have a relatively wide molecular weight distribution are obtained by this method. On the other hand, the combination of various methacrylates in a triblock copolymer of this type does not appear to be able to confer on this copolymer, even after subsequent hydrolysis and/or neutralization of the ester groups, properties which render it suitable for a particular application. On the other hand, the combination, in a triblock copolymer, of acrylate blocks and methacrylate or vinylaromatic blocks appears capable, provided that the copolymer has a narrow molecular weight distribution, of providing properties of value in several types of application.
Moreover, it is known that a living polymer obtained by an anionic method is able to react with a terminating agent such as a halogenated compound and that, in order to avoid undesirable side reactions, this termination reaction may be preceded by a reaction with a lower alkylene oxide or sulfide. When the terminating agent itself contains an alpha-beta ethylenic unsaturation or another polymerizable group, the resulting polymer is. known under the name macromonomer. Examples of such macromonomers have been described in particular in the following patents: U.S. Pat. No. 3,786,116, 3,842,059, EP-A-104 046 and U.S. Pat. No. 4,567,239. Poly(alkyl methacrylate) macromonomers endowed with a styrene or methacrylate ester group at one end of the chain have been described by P. Lutz et al., Poly. Bull. 12, 79 (1984). S. D. Smith, in Polymer Preprints Vol 29, no. 2, 1988, No. 3776, pages 48 and 49, describes methyl methacrylate macromonomers endowed at one end of the chain with a vinyl group (following the use, as terminating agent, of 4-vinylbenzoyl chloride), or with an O.sup.- anion (following the use, as terminating agent, of benzaldehyde), with the possibility of then reacting this anion with reagents such as methacryloyl chloride and chloromethylstyrene, or of obtaining macromonomers containing a hydroxyl functional group. Finally, Patent Application JP-A-62/232 408 describes the preparation of butyl acrylate macromonomers having acarboxyl terminal group by polymerization in the presence of 3-mercaptopropionic acid. By reacting the carboxyl terminal group with glycidyl methacrylate, a butyl acrylate macromonomer having a terminal methacryloyloxy group is obtained, the polydispersity index of which is about 1.8. If a 2-mercaptoethanol is used in the first step, a polymer having a hydroxyl terminal group is obtained.
The present invention provides a process which makes it possible to combine the potential advantages of multiblock polymers containing acrylic sequences with the reactivity possibilities of the macromonomers, that is to say a process for the preparation of functionalized multiblock macromonomers.
The present invention therefore firstly relates to a functionalized multiblock macromonomer of formula: ##STR3## or of formula: ##STR4## in which formulae: each of the blocks A, B and C represents a sequence of a monomer chosen from the acrylic, vinylaromatic, methacrylic, diene, vinylpyridine, vinylpyrrolidone, alkylene oxide, lactam, lactone and maleimide monomer classes, on condition that at least one of the blocks A and C is chosen from a different class to that of block B and that at least one of the blocks A, B or C is a (meth)acrylic sequence, sequence under consideration, such that 3.ltoreq.n.ltoreq.1000, 0.ltoreq.m.ltoreq.1000 and 0.ltoreq.p.
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Barbier Yves
Fayt Roger
Gaillard Patrice
Jacobs Christian
Teyssie Philippe
Elf Atochem S.A.
Seidleck James J.
Zemel I.
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