Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1987-04-06
1988-01-05
Michl, Paul R.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526135, 526147, C08F 450
Patent
active
047177560
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a process for preparing a methacrylate polymer. More particularly, the present invention relates to a process for preparing a methacrylate polymer which comprises rapidly polymerizing a methacrylate ester or an unsaturated monomer mixture comprising the methacrylate ester as a main component in the presence of a specific polymerization initiator and a specific accelerator.
BACKGROUND OF THE INVENTION
As described in DE-AS No. 1 146 254, when polymerization of an unsaturated monomer such as a methacrylate ester is initiated at room temperature and rapidly proceeded by the use of a multi-component system of a polymerization initiator and an accelerator (hereinafter referred to as "initiator system"), a process comprising an independent addition and mixing of each component of the initiator system with the monomer has a problem in that the components are hardly mixed homogeneously in a short time and the polymerization reaction cannot be sufficiently effected. In addition, a process comprising premixing each component of the initiator system and adding the mixture to the monomer has a problem such that, depending on a combination of the components, a reaction among the premixed components occurs so that the components are degraded in a short time.
The above DE-AS describes an initiator system and a manner for adding it which do not suffer from the above problems and are used in a process in which polymerization of the unsaturated monomer such as the methacrylate ester is initiated at room temperature and conducted comparatively rapidly.
The initiator system proposed in the above DE-AS is one comprising an alkyl acyl peroxide, a specific compound containing a halogen atom, a sulfur-containing compound, and as an optional component a heavy metal containing compound. The addition of the initiator system to the monomer is carried out by adding a solution of the alkyl acyl peroxide and the specific compound containing the halogen atom in an inert solvent to a system in which the monomer, the sulfur-containing compound, and optionally the heavy metal containing compound are premixed.
OBJECTS OF THE INVENTION
One object of the present invention is to provide a new process which can result in a rapid polymerization of a methacrylate ester and the like.
It is convenient to use a procedure in which the monomer is divided into two parts, and the polymerization initiator and a part of the accelerator are added to one part of the monomer and the rest of the accelerator is added to the other part of the monomer to prepare two solutions having good storageability, which are mixed when polymerization is to be effected so as to achieve the above object in a process for proceeding the rapid polymerization of the methacrylate ester and the like.
Another object of the present invention is to provide a process for polymerization using an initiator system which can be used in such a mixing procedure.
DETAILED DESCRIPTION OF THE INVENTION
One aspect of the present invention resides in a process for preparing a methacrylate polymer comprising polymerizing a methacrylate ester or a mixture of unsaturated monomers comprising the methacrylate ester as a main component in the presence of (1) a hydroperoxide polymerization initiator, (2) a reductant containing sulfur in a molecule, (3) a hydrogen halogenide salt of amine or a quarternary ammonium halogenide, and (4) a copper-containing compound.
The methacrylate ester used in the present invention is a methacrylate ester of a mono- or poly-hydric alcohol containing an alkyl group having 1 to 25 carbon atoms. As the alcohol, exemplified are methanol, ethanol, isopropanol, tert-butanol, sec-butanol, phenol, cyclohexanol, 4-methylcyclohexanol, 1-cyclohexylethanol, 1-adamantanol, 2-adamantanol, 3-methyl-1-adamantanol, 3,5-dimethyl-1-adamantanol, 3-ethyladamantanol, 3-methyl-5-ethyl-1-adamantanol, 3,5,8-triethyl-1-adamantanol, 3,5-dimethyl-8-ethyl-1-adamantanol, octahydro-4,7-menthanoinden-5-ol, octahydro-4,7-menthanoinden-1-yl
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patent: 3985718 (1976-10-01), Chabert
patent: 4009150 (1977-02-01), Norling
patent: 4081308 (1978-03-01), Skoultchi
patent: 4174311 (1979-11-01), Nakano et al.
patent: 4259462 (1981-03-01), Nakano et al.
patent: 4415417 (1983-11-01), Bush
Kato Yasuyuki
Moritani Masahiko
Yasunori Yukio
Yuyama Masahiro
Michl Paul R.
Sumitomo Chemical Company Limited
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