Method for carrying out a mass polymerization
AssigneeList Holding AG
InventorPierre-Alain Fleury
Life of this patent
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Abstract
A method for carrying out a mass polymerization of monomers and/or pre-polymers, which are at least partially soluble in their polymers, in particular methyl methacrylate (MMA) is provided. The method involves the addition of at least one monomer or pre-polymer in a reactor. Mass polymerization for amorphous polymers is carried out without solvents below the glass transition temperature and for crystalline polymers below the melting point, achieving a high degree of conversion of the monomers.
Claims9
A method for carrying out a mass polymerization of monomers and/or prepolymers which are at least partly soluble in their polymers, comprising the steps of:
- metering at least one monomer or prepolymer into a reactor;
- carrying out the mass polymerization without adding a solvent at any time and below the glass transition temperature in the case of amorphous polymers or below the melting point in the case of crystalline polymers up to a monomer conversion from 60 to 90%;
- and
- said carrying out step comprising eliminating exothermicity by evaporating the at least one monomer so as to control product temperature and using evaporative cooling to control said product temperature so as to convert said 60 to 90% of said monomer and to stop said conversion so that said conversion is not greater than 90%.
Dependencies are inferred from the claim text.