Patent ID: 6399733
Filing Date: 2002-06-04
Classification: C08G

Abstract:
A process for preparing a highly pure silicone laded polymer comprising sodium, potassium, iron, copper, lead, magnesium, manganese, and chlorine, each in an amount of, at most 1 ppm, and uranium and thorium, each in an amount of, at most, 1 ppb, and represented by general formula (1): â€ƒwherein R1 and R2 are the same or different and are selected from the group consisting of a fluorine atom, a hydrogen atom, a lower alkyl group, an alkenyl group, an aryl group, a lower alkyl group in which a part or all of hydrogen atoms are substituted with a fluorine atom, an alkenyl group in which a part or all of hydrogen atoms are substituted with a fluorine atom, and an aryl group in which a part or all of hydrogen atoms are substituted with a fluorine atom; R3, R4, R5 and R6 are the same or different and are selected from the group consisting of a hydrogen atom, a lower alkyl group, and a lower alkyl group in which a part or all of hydrogen atoms are substituted with a fluorine atom; and n represents an integer of 5 to 10000, which comprises: (a) obtaining a prepolymer in which at least one organosilane compound is dissolved in an organic solvent and hydrolyzed with ultrapure water to obtain a prepolymer; (b) washing the obtained prepolymer with ultrapure water; and, (c) dissolving the washed prepolymer in an organic solvent and heating without a catalyst.