Abstract:
To provide an optical member having an excellent transparency and heat resistance and further having favorable light resistance as compared with a molded product made of a conventional ethylene/tetrafluoroethylene copolymer, a process for producing the same, and an article provided with the optical member.An optical member made of a molded product containing a crosslinked product of an ethylene/tetrafluoroethylene copolymer comprising units (A) based on tetrafluoroethylene, units (B) based on ethylene and units (C) based on CH2═CH—CnF2n+1 (wherein n is an integer of from 2 to 10), wherein the molar ratio ((A)/(B)) of the to above units (A) to the above units (B) is from 50/50 to 66/34, and the molar ratio ((C)/{(A)+(B)}) of the above units (C) to the sum of the above units (A) and the above units (B) is from 4.0/100 to 10/100.
Abstract translation:为了提供与由常规乙烯/四氟乙烯共聚物制成的模制品相比,具有优异的透明性和耐热性并且还具有良好的耐光性的光学构件,其制造方法和设置有光学构件的制品。 一种由包含基于四氟乙烯的单元(A),基于乙烯的单元(B)和基于CH 2 = CH-C n F 2n + 1的单元(C))的乙烯/四氟乙烯共聚物的交联产物的模制产品制成的光学构件(其中 n为2〜10的整数),上述单元(A)与上述单元(B)的摩尔比((A)/(B))为50/50〜66/34, 上述单元(C)与上述单元(A)和上述单元(B)之和的摩尔比((C)/ {(A)+(B)})为4.0 / 100〜10 / 100。
Abstract:
To provide a method for recovering an anionic fluorinated emulsifier, whereby an anionic fluorinated emulsifier adsorbed on a basic ion exchange resin can be simply and efficiently recovered. A mixed liquid of an aqueous inorganic acid solution, a fluorinated medium and a non-fluorinated medium, is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, to recover a liquid phase containing the fluorinated medium, or an aqueous inorganic acid solution is contacted to a basic ion exchange resin having an anionic fluorinated emulsifier adsorbed thereon, then a mixed liquid of a fluorinated medium and a non-fluorinated medium is contacted thereto, and thereafter the basic ion exchange resin and a liquid phase are separated to recover the liquid phase, whereupon from each liquid phase, an acid of the anionic fluorinated emulsifier is recovered.