摘要:
Tetrahydrofuran/alkylene oxide polymerizates containing no more than 3%, by weight, of oligomeric cyclic ethers are prepared by extracting the ethers from a raw polymerizate with water.
摘要:
The oligomeric cyclic ether content of a tetrahydro- furan/alkylene oxide polymerizate is significantly reduced by bringing the polymerizate into contact with an acid-activated sodium or calcium montmorrillonite clay.
摘要:
The oligomeric cyclic ether content of a tetrahydrofuran/ alkylene oxide polymerizate is significantly reduced by bringing the polymerizate into contact at elevated temperatures with an ion exchange resin bearing -S0 3 H groups.
摘要:
Copolyether glycols are modified so that they contain 1-25%, by weight of β,β'-dihydroxyalkyl sulfide moieties. These modified copolyether glycols have enhanced resistance to degradation by heat and oxygen.
摘要:
@ Polypropylene ether glycol is modified so that it contains 1-25%, by weight of β,β'-dihydroxyalkyl sulfide moieties. These modified polypropylene ehter glycols have enhanced resistance to degradation by heat and oxygen.