Title:
ポリエトキシシロキサン材料の製造方法、利用法及びポリエトキシシロキサン材料
Document Type and Number:
Japanese Patent JP5617091
Kind Code:
B2
Abstract:
The present invention relates to a polyethoxysiloxane (PES) material to be obtained in that (a) a first hydrolysis condensation reaction of a maximum of one group X of one or more different Si compounds of the formula (I) SiX4 (I) in which the groups X are the same or different and represent hydroxy, hydrogen, or ethoxy (EtO), are catalyzed in an acidic fashion at an initial pH value of 0 to ≰7, is conducted in the presence of ethanol (EtOH) or an ethanol-water mixture as a solvent over a time period of 1 to 24 hours at a temperature of 0° C. to 78° C, (b) a second hydrolysis condensation reaction of the material obtained in step (a) is conducted while simultaneously removing the solvent by successive evaporation in a gas diffusion-tight container at a pressure of 100 to 1013 mbar, preferably at a slight negative pressure of 300 mbar to 800 mbar and a temperature of 50-78° C. until a drastic increase in viscosity (at a shear rate of 10 s−1 at 4° C.) to 0.5 to 2 Pa·s until a constant weight is attained and a cyclotetrasiloxane of the general formula ((SiO(OH)0,75(OEt)1,25× 1/64H2O)4 and a molar mass of 4*approx. 114 g=approx. 456 g; (c) said PES material is cooled in a closed container over a time period from a few minutes to a few hours, and (d) the PES material obtained from step (c) is converted into an rPES material by a third hydrolysis condensation reaction.
Inventors:
シーロフ、アクセル
Application Number:
JP2010510648A
Publication Date:
November 05, 2014
Filing Date:
June 03, 2008
Export Citation:
Assignee:
ベイヤー イノベーション ゲーエムベーハー
International Classes:
C08G77/18; A61K9/00; A61K9/06; A61K9/14; A61K47/34; A61L15/64; A61L17/00; A61L27/00
Attorney, Agent or Firm:
Ryuka international patent business corporation