Heat-resistant material and coating material for OA equipments having flexibility

Abstract

It is possible to provide the heat resistant material and coating material for OA equipment which comprise a fluorine-containing multi-segment polymer having heat resistance, abrasion resistance, non-sticking property against toner and oil resistance in addition to flexibility and are used particularly on surfaces of fuser roll and belt. Those materials comprise a fluorine-containing multi-segment polymer having an elastomeric fluorine-containing polymer chain segment A and a non-elastomeric fluorine-containing polymer chain segment B, and the elastomeric fluorine-containing polymer chain segment A comprises not less than 90% by mole of perhaloolefin unit as a recurring unit and imparts flexibility to the whole polymer.

1. A tube produced by molding a fluorine-containing multi-segment polymer having an elastomeric fluorine-containing polymer chain segment A and a non-elastomeric fluorine-containing polymer chain segment B; said elastomeric fluorine-containing polymer chain segment A comprises not less than 90% by mole of perhaloolefin unit as a recurring unit and said non-elastomeric fluorine-containing polymer chain segment B contained in said fluorine-containing multi-segment polymer is a polymer chain having a crystalline melting point of not less than 150° C. 
     
     
       2. The tube of  claim 1 , which is characterized in that the elastomeric fluorine-containing polymer chain segment A contained in said fluorine-containing multi-segment polymer is a polymer chain having a glass transition temperature of not more than 25° C. 
     
     
       3. The tube of  claim 2 , which is characterized in that the elastomeric fluorine-containing polymer chain segment A contained in said fluorine-containing multi-segment polymer is an elastic polymer chain comprising 50 to 85% by mole of tetrafluoroethylene and 15 to 50% by mole of perfluoro(alkyl vinyl ether). 
     
     
       4. The tube of  claim 3 , which is characterized in that the non-elastomeric fluorine-containing polymer chain segment B contained in said fluorine-containing multi- segment polymer is a polymer chain comprising more than  85   %  by mole and  not more than 100% by mole of tetrafluoroethylene and from 0% by mole or less than 15% by mole of the formula (1):
   CF 2 ═CF—R f   1   (1)  
 
       wherein R f   1  is CF 3  or OR f   2 , in which R f   2  is a perfluoroalkyl group having 1 to 5 carbon atoms. 
     
     
       5. The tube of  claim 1 , which is characterized in that the non-elastomeric fluorine-containing polymer chain segment B contained in said fluorine-containing multi-segment polymer is a polymer chain comprising more than 85% by mole and not more than 99.7% by mole of tetrafluoroethylene and not less than 0.3% by mole and less than 15% by mole of the formula (1):
   CF 2 ═CF—R f   1   (1)  
 
       wherein R f   1  is CF 3  or OR f   2 , in which R f   2  is a perfluoroalkyl group having 1 to 5 carbon atoms. 
     
     
       6. The tube of  claim 3 , which is characterize in that the non-elastomeric fluorine-containing polymer chain segment B contained in said fluorine-containing multi-segment polymer is a polymer chain comprising more than 85% by mole and not more than 99.7% by mole of tetrafluoroethylene and not less than 0.3% by mole and less than 15% by mole of the formula (1):
   CF 2 ═CF—R f   1   (1)  
 
       wherein R f   1  is CF 3  or OR f   2 , in which R f   2  is a perfluoroalkyl group having 1 to 5 carbon atoms. 
     
     
       7. The tube of  claim 1 , which is characterized in that the non-elastomeric fluorine-containing polymer chain segment B contained in said fluorine-containing multi-segment polymer is a polymer chain comprising more than 85% by mole and not more than 100% by mole of tetrafluoroethylene and 0% by mole or less than 15% by mole of the formula (1):
   CF 2 ═CF—R f   1   (1)  
 
       wherein R f   1  is CF 3  or OR f   2 , in which R f   2  is a perfluoroalkyl group having 1 to 5 carbon atoms.