Preparation of low color copoly(arylene sulfide) by heating copoly(arylene sulfide)
AssigneeEastman Kodak Company
InventorsDavid R. Fagerburg, Mark Rule, Joseph J. Watkins, Paul B. Lawrence
Life of this patent
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Abstract
A process comprising heating for a sufficient period of time and at a temperature in the range of the glass transition temperature of the polymer to 5 degrees C below the melting point of the polymer, a solid, comminuted, copoly(arylene sulfide) prepared by reacting at a polymer producing temperature a mixture of a diiodoaromatic compound and elemental sulfur which contains less than 0.05 weight percent carbon, the copoly(arylene sulfide) corresponding to the structure [(--A--S--).sub.1--x (--A--S--S--).sub.x ].sub.n wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.2 to 0.005 and n is at least 100.
Claims12
A process comprising heating for a minimum of 5 minutes and at a temperature in the range of the glass transition temperature of the polymer to 5 degrees C. below the melting point of the polymer, a solid, comminuted, copoly(arylene sulfide) prepared by reacting at a polymer producing temperature a mixture of a diiodoaromatic compound and elemental sulfur which contains less than 0.05 weight percent sulfur which contains less than 0.05 weight percent carbon, the copoly(arylene sulfide) corresponding to the structure
- [(--A--S--).sub.1--x (--A--S--S--).sub.x ].sub.n
- wherein A is a divalent substituted or unsubstituted aromatic radical, x is in the range of 0.2 to 0.005 and n is at least 100.
A process comprising heating for a period of time of at least 6 hours and at a temperature in the range of 100.degree.-270.degree. C., a solid, comminuted, copoly(phenylene sulfide) prepared by reacting at a temperature in the range of 180.degree.-350.degree. C. a mixture of p-diiodobiphenyl and elemental sulfur which contains less than 0.01 weight percent carbon, the copoly(arylene sulfide) corresponding to the structure
- [(--A--S--).sub.1--x (--A--S--S--).sub.x ].sub.n
- wherein A is a divalent phenylene radical, x is in the range of 0.6 to 0.005, and n is at least 100.
Dependencies are inferred from the claim text.