| 摘要 |
1,250,470. Filter press plates. DYNAMIT NOBEL A.G. 7 Nov., 1968 [14 Nov., 1967], No. 52865/68. Heading B1D. [Also in Division C3] The invention comprises a filter press plate formed from a polymer of formula where n is greater than 20 and R is a direct bond or is an aliphatic cycloaliphatic or aromatic radical, and -O- or -S- atom or a -SO- or -SO 2 - group. A specific material mentioned is the condensation product of 4,4'-dichlorodiphenyl sulphone with Bisphenol A. The filter plate may be made from the polymer by injection moulding, extrusion or pressing. |
