Method for producing granular polycarbonate prepolymer for solid-state polymerization
First Claim
1. A method for producing polycarbonate prepolymer pellets for solid-phase polymerization, comprising dissolving a polycarbonate prepolymer in a solvent to form a prepolymer solution, passing the prepolymer solution through a tubular condenser to crystallize it into strands, and reducing said crystallized strands to predetermined lengths.
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Abstract
Provided is a method for producing a granular polycarbonate prepolymer for solid-phase polymerization, comprising dissolving a polycarbonate prepolymer in a solvent under heat, then crystallizing it by cooling, and shaping it. The grains of the granular prepolymer hardly fuse together in polymerization, and the granular prepolymer is suitable for high-speed solid-phase polymerization to give polycarbonate.
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Citations
12 Claims
- 1. A method for producing polycarbonate prepolymer pellets for solid-phase polymerization, comprising dissolving a polycarbonate prepolymer in a solvent to form a prepolymer solution, passing the prepolymer solution through a tubular condenser to crystallize it into strands, and reducing said crystallized strands to predetermined lengths.
- 2. A method for producing a granular polycarbonate prepolymer for solid-phase polymerization, comprising dissolving a polycarbonate prepolymer in a solvent to form a prepolymer solution, contacting the prepolymer solution with a cooling gas to crystallize the prepolymer and granulating the crystallized prepolymer.
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