Process for the preparation of aromatic sulfur-containing polymers
AssigneeHoechst Aktiengesellschaft
InventorsMichael Haubs, Andreas Schleicher, Thorsten Niklas
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Abstract
In the process for the preparation of aromatic sulfur-containing polymers, the polymer is formed from a prepolymer having halogen end groups. The process can be carried out in two stages: 1. Preparation of the prepolymer and 2. conversion of the prepolymer into the polymer. The process is particularly suitable for the preparation of polyphenylene sulfide.
Claims20
A process for producing an aromatic sulfur containing polymer which comprises in a first stage, producing a prepolymer containing halogenated end groups in the presence of a solvent from A) a halogenated aromatic hydrocarbon compound and B) a sulfide, wherein component A) is present in excess;
- separating the prepolymer from the reaction mixture;
- and, in a second stage, dissolving the prepolymer in a solvent;
- adding a small amount of component B) to the resulting solution;
- polymerizing the mixture thus formed in an homogenous state to obtain an aromatic sulfur containing polymer;
- and recovering the polymer.
A process for producing an aromatic sulfur containing polymer which comprises in a first stage producing a prepolymer containing halogenated end groups in the presence of a solvent from A) a dihalo-aromatic compound and B) a sulfide of an alkali- or alkali earth metal or hydrates thereof, wherein component A) is present in a 5 to 50% molar excess;
- separating the prepolymer from the reaction mixture;
- and, in a second stage, dissolving the prepolymer in a solvent;
- adding a small amount of component B) to the solution;
- polymerizing the mixture thus formed in an homogenous state to obtain an aromatic sulfur containing polymer;
- and recovering the polymer.
A process for producing an aromatic sulfur containing polymer which comprises dissolving a halogen terminated prepolymer in a solvent;
- adding a small amount of a sulfide to the solution;
- polymerizing the mixture thus formed in an homogenous state to obtain the aromatic sulfur containing polymer;
- and recovering the polymer.
Dependencies are inferred from the claim text.