Patent ID: 8969451
Filing Date: 2015-03-03
Classification: C08G,C08J,C08K,C08L

Abstract:
1. A method of producing a base compound for a liquid fluoroelastomer comprising: (A) a linear fluoropolyether compound having at least two alkenyl groups within each molecule and having a perfluoroalkyl ether structure within the main chain, and (B) a hydrophobic silica powder, the method comprising: (1) heating the component (A) under normal pressure at a temperature within a range of from 50 to 100° C, (2) adding 20 to 60 parts by mass of the component (B) to 100 parts by mass of the component (A) that has been heated in step (1) while performing kneading to obtain a kneaded product, (3) kneading the kneaded product obtained in step (2) at a temperature exceeding 100° C., either under conditions of heat and reduced pressure or under conditions of heat and pressure, and (4) adding an additional amount of the component (A) to a kneaded product obtained in step (3) to achieve a blend ratio of 5 to 50 parts by mass of the component (B) per 100 parts by mass of the component (A).