Process for preparing polymeric organo-phosphonates

Claim 1

A PROCESS FOR PREPARING RESINOUS, LINEAR POLYPHOSPHONATES WHICH COMPRISES HEATING IN THE PRESENCE OF AN ANHYDROUS ALKALINE-EARTH HALIDE CONDENSATION CATALYST A MIXTURE COMPRISING APPROXIMATELY EQUIMOLAR QUANTITIES OF A DIHYDRXY AROMATIC COMPOUND SELECTED FROM THE GROUP CONSISTING OF DIHYDROXYBENZENE AND A DIHYDROXY DIPHENYL AND A DIHYDROXYDIPHENYL SULFONE, AND AN ORGANO-PHOSPHONIC ACID DIPHENYL ESTER SELECTED FROM THE GROUP CONSISTING OF AN ALKYL-PHOSPHONIC ACID DIPHENYL ESTER WHEREIN THE ALKYL GROUP CONTAINS FROM 1 TO 12 CARBON ATOMS, A CHLOROALKYPHOSPHONIC ACID DIPHENYL ESTER WHEREIN THE CHLOROALKYL GROUP CONTAINS FROM 1 TO 12 CARBON ATOMS, A PHENYL-PHOSPHONIC ACID DIPHENYL ESTER, A TOLYL-PHOSPHONIC ACID DIPHENYL ESTER, A BENZYL-PHOSPHONIC ACID DIPENYL ESTER AND A CYCLOALKYL-PHOSPHINIC ACID DIPENYL ESTER WHEREIN THE CYCLOALKYL GROUP CONTAINS FROM 5 TO 6 CARBON ATOMS, AT A TEMPERATURE OF FROM 100-400* C., UNTIL THE CONDENSATION REACTION IS SUBSTANTIALLY COMPLETE.