Polysulphones as insulators

Claim 2

Transformer parts containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO 2 -- where Ar is a divalent aromatic residue derived from benzene, a polynuclear hydrocarbon, diphenyl, a compound having the structure ##STR15## where P is --O--, --S--, --SO--, a divalent hydrocarbon radical, a substituted divalent hydrocarbon radical or a residue of a diol containing only carbon atoms or groups of the structure --C--O--C-- or --C--S--C-- in the chain between the hydroxyl groups, or substituted derivatives of any such aromatic residues in which one or more of the hydrogen atoms bound to the aromatic rings are substituted by other monovalent atoms or groups, and Ar may vary from unit to unit in the polymer chain.

Claim 3

Transformer parts according to claim 1, containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO 2 -- where Ar is a divalent aromatic residue derived from benzene, a polynuclear hydrocarbon containing not more than two aromatic rings, diphenyl, a compound having the structure ##STR16## where P is --O--, --S--, --SO--, a divalent hydrocarbon radical, a substituted divalent hydrocarbon radical or a residue of a diol containing only carbon atoms or groups of the structure --C--O--C-- or --C--S--C-- in the chain between the hydroxyl groups, or substituted derivatives of any such aromatic residues in which one or more of the hydrogen atoms bound to the aromatic rings are substituted by halogen atoms, alkyl groups containing from 1 to 4 carbon atoms or alkoxy groups containing from 1 to 4 carbon atoms, and Ar may vary from unit to unit in the polymer chain.

Claim 4

Transformer parts according to claim 1 containing as electrical insulant a shaped polymeric material according to claim 2 in which at least some of the repeating units are derived from compounds having the structure ##STR17## where P is --O--, --S--, --SO--, a divalent hydrocarbon radical, a substituted divalent hydrocarbon radical or a residue of a diol containing only carbon atoms or groups of the structure --C--O--C -- or --C--S--C-- in the chain between the hydroxyl groups, or substituted derivatives of any such aromatic residues in which one or more of the hydrogen atoms bound to the aromatic rings are substituted by halogen atoms, alkyl groups containing from 1 to 4 carbon atoms or alkoxy groups containing from 1 to 4 carbon atoms.

Claim 5

Transformer parts according to claim 1 containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO 2 -- where Ar is a divalent aromatic nucleus of the structure ##STR18## where P is --O-- or --S-- and R 1 , R 2 , R 3 , and R 4 are selected from the group consisting of hydrogen atoms, halogen atoms, alkyl groups having from 1 to 4 carbon atoms and alkoxy groups having from 1 to 4 carbon atoms and Ar may vary from unit to unit in the polymer chain.

Claim 6

Transformer parts according to claim 1 containing as electrical insulant a shaped polymeric material formed of repeating units having the structure --Ar--SO 2 --where Ar is a divalent aromatic nucleus of the structure ##STR19## where P is --O-- or --S--,

Claim 7

Transformer parts according to claim 4 containing as electrical insulant a shaped polymeric material formed of repeating units having the structure ##STR20## and repeating unit having the structure ##STR21## where P is --O-- or --S-- and R 1 , R 2 , R 3 and R 4 are selected from the group consisting of hydrogen atoms, halogen atoms, alkyl groups having from 1 to 4 carbon atoms and alkoxy groups having from 1 to 4 carbon atoms.

Claim 8

Transformer parts containing as electrical insulant a shaped polymeric material according to claim 6 in which from 5 to 80 for every 100 units in the polymer chain have the structure ##STR22## where R 1 , R 2 , R 3 , and R 4 are selected from the group consisting of hydrogen atoms, halogen atoms, alkyl groups having from 1 to 4 carbon atoms and alkoxy groups having from 1 to 4 carbon atoms.

Claim 9

Transformer parts containing as electrical insulant a shaped polymeric material according to claim 6 formed of repeating units having the structure ##STR23## and repeating units having the structure ##STR24##

Claim 10

Transformer parts according to claim 1 containing as electrical insultant a shaped polymeric material formed of repeating unit having the structure ##STR25##

Claim 11

Transformer parts according to claim 1 containing as electrical insultant a shaped polymeric material formed of repeating units having the structure ##STR26##

Claim 12

Transformer parts containing as electrical insulant a shaped polymeric material according to claim 1 having a reduced viscosity of at least 0.6, measured on a solution of 1g of the polymer in 100 cm 3 of dimethyl formamide at 25° C.