EP 1035157 A1 20000913 - HIGHLY CLEAN POROUS POLYVINYL ACETAL RESIN, METHOD FOR PREPARING THE SAME, AND METHOD FOR STORING THE SAME
Title (en)
HIGHLY CLEAN POROUS POLYVINYL ACETAL RESIN, METHOD FOR PREPARING THE SAME, AND METHOD FOR STORING THE SAME
Title (de)
HOCHREINES PORÖSES POLYVINYLACETATHARZ, HERSTELLUNGSVERFAHREN DAFÜR UND DESSEN SPEICHERVERFAHREN
Title (fr)
RESINE D'ACETAL DE POLYVINYLE POREUSE ET D'UNE GRANDE PROPRETE, PROCEDE DE FABRICATION ET PROCEDE DE STOCKAGE DE CETTE RESINE
Publication
Application
Priority
JP 9704249 W 19971121
Abstract (en)
A porous poly(vinyl acetal) resin body is made to have COD of 5 ppm or smaller, a conductivity of 5 mu S/cm or lower, and the number of particles having a size of 2.5 mu m or larger of 50,000/cc or smaller, as measures for the cleanliness. Using the porous poly(vinyl acetal) resin body having such a high degree of cleanliness in a cleaning process in a clean room or the like, one can reduce or eliminate a conventionally required pretreatment such as a thorough cleaning of the body to prevent elution of contaminants. <IMAGE>
IPC 1-7
IPC 8 full level
CPC (source: EP)
B08B 1/14 (2024.01)
Designated contracting state (EPC)
DE GB IE
DOCDB simple family (publication)
EP 1035157 A1 20000913; EP 1035157 A4 20010207; EP 1035157 B1 20060308; AU 5066398 A 19990615; DE 69735412 D1 20060504; DE 69735412 T2 20060810; WO 9927003 A1 19990603
DOCDB simple family (application)
EP 97913421 A 19971121; AU 5066398 A 19971121; DE 69735412 T 19971121; JP 9704249 W 19971121