Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1999-01-25
2000-12-12
Pezzuto, Helen L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526 90, 526126, 526170, 526223, 526224, 526328, C08F12018
Patent
active
061600709
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a preparation process of a poly(meth)acrylate ester by using a chain transfer agent.
BACKGROUND ART
A technique of preparing a poly(meth)acrylate ester by using a chain transfer agent in radical polymerization is known conventionally. In this polymerization technique, however, the terminal structure of the polymer is generally not fixed owing to the termination of disproportionation or chain transfer into the solvent, monomer or initiator employed, which makes it difficult to control the terminal structure of the polymer. This also becomes a cause for the deterioration of the thermal decomposition resistance of the polymer.
In addition, known is a technique of controlling the polymerization of a (meth)acrylate ester by using a chain transfer agent in living polymerization (Japanese Patent Application Laid-Open No. 133212/1986). In this polymerization technique, a tetracoordinate organosilicon, organotin or organogermanium compound is used as a polymerization initiator and in addition, a co-catalyst system which is a ion source, such as bifluoride, fluoride, cyanide or azide; or a suitable oxyanion, a Lewis acid or a non-anionic Lewis base is employed. Although the molecular weight of the polymer prepared by this polymerization technique can be controlled, it has not sufficient steric regularity.
On the other hand, as a technique of preparing a poly(meth)acrylate ester by using an organometallic compound, particularly, an organic rare earth metal compound, conventionally known are a preparation process (Japanese Patent Application Laid-Open No. 258808/1990) of a vinyl polymer by using a divalent rare earth metal compound and a preparation process (Japanese Patent Application Laid-Open No. 263412/1991) of a poly(meth)acrylate ester by using a trivalent rare earth metal compound. These polymerization techniques make it possible to prepare a syndiotactic poly(meth)-acrylate ester having narrow molecular weight distribution and a high molecular weight.
The above-described polymerization system formed with the divalent rare earth metal compound or trivalent rare earth metal compound as a polymerization initiator is accompanied with the drawbacks such that 1) the molecular weight of the polymer can be controlled only by a monomer/initiator ratio, 2) the organometallic compound used as an initiator remains in the resulting polymer and colors the polymer, 3) use of an expensive initiator in a large amount is required, and 4) the resulting polymer has low thermal decomposition resistance.
DISCLOSURE OF THE INVENTION
An object of the present invention is therefore to provide a process for the preparation of a poly(meth)-acrylate ester by using an organometallic compound as a polymerization initiator, which process can control the molecular weight of the polymer easily, prevent the coloring due to the initiator, reduce the using amount of the initiator and impart the polymer with high thermal decomposition resistance.
With a view to attaining the above-described object, the present inventors have carried out an extensive work. As a result, it has been found that upon polymerization of a (meth)acrylate ester by using an organometallic compound, the polymerization in the presence of a specific compound as a chain transfer agent makes it possible to reduce the amount of the polymerization initiator, control the molecular weight of the polymer easily and reduce the remaining amount of the organometallic compound, resulting in the prevention of the coloring of the poly-(meth)acrylate ester and, owing to the remaining of the residue of the chain transfer agent on one end of the polymer molecule, improvement in the thermal decomposition resistance, leading to the completion of the present invention.
In the present invention, there is thus provided a process for the preparation of a poly(meth)acrylate ester, which comprises, upon polymerization of a (meth)acrylate ester by using an organometallic compound having at least one polymerization initiating site, carrying out the poly
REFERENCES:
patent: 4568705 (1986-02-01), Grace et al.
Nodono Mitsufumi
Tokimitsu Toru
Tone Seiji
Yanagase Akira
Mitsubishi Rayon Co. Ltd.
Pezzuto Helen L.
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