摘要:
A hydrolyzable group-containing organohydrogenpolysiloxane is prepared by (A) reacting (a) an organosiloxane with (b) an organosilane or organosiloxane containing a hydrolyzable group, at least one of components (a) and (b) containing hydrosilyl, in the presence of a superstrong acid catalyst, (B) adding an inorganic basic neutralizing agent and/or an adsorbent to the resulting reaction solution, and (C) removing the neutralized and/or adsorbed form of the superstrong acid catalyst. The process proceeds in an essentially non-aqueous system, and the organohydrogenpolysiloxane free of residual acidic catalyst is obtainable at low cost.
摘要:
The present invention relates to an improved method of polymerising silicone fluids, more particularly, this method is particularly convenient for producing low viscosity silicone oils.
摘要:
A method is presented for making alkoxy-modified silsesquioxanes (AMS) or coalkoxy-modified silsesquioxanes (co-AMS,) comprising the steps of (a) combining as a reaction mixture (i) water, (ii) an acid-stable solvent for the water, (iii) a solid strong cationic hydrolysis and condensation catalyst, and (iv) a trialkoxysilane compound, (b) allowing the reaction mixture to react for about 0.5 hours to about 200 hours to form the alkoxy-modified silsesquioxanes; and (c) recovering the alkoxy-modified silsesquioxanes from the reaction mixture. The use of solid strong cationic catalysts in this reaction system is advantageous because they remain as solids throughout the reaction, allowing simplified separation of the solid catalyst from the soluble AMS or co-AMS products, resulting in total or near total recovery of the AMS or co-AMS products, the products being free of, or substantially free of residual acid catalyst, as well as virtual total recovery of the catalyst for recycling. The improved AMS and co-AMS compounds, vulcanizable rubber compounds containing them, and a pneumatic tire having a component made from the vulcanized rubber compounds are also presented.
摘要:
The present invention relates to a method for manufacturing hydrophilic polysiloxanes, wherein a hydrido-containing cyclic siloxane is reacted with a hydrophilic molecule comprising a carbon-carbon double bond, having the general formula (l) H 2 C=CH-(CHR) n -O-(CHR 1 CR 2 R 3 ) m R 4 or (II) H 2 C=CH-(CHR) n -R 5 , wherein n is an integer from 0 to 4, m is an integer from 0 to 5, R, R 1 , R 2 , R 3 and R 4 are each independently hydrogen or a C 1 to C 6 alkyl, R 5 is a saturated cyclic hydrocarbon containing carbonyl group, in the presence of a first catalyst to obtain a monomer, and polymerising said monomer in the presence of a second catalyst. The present invention also relates to hydrophilic polysiloxanes and to elastomers based on these polysiloxanes.
摘要翻译:本发明涉及一种亲水性聚硅氧烷的制造方法,其中含氢环状硅氧烷与包含碳 - 碳双键的亲水性分子反应,具有通式(I)H 2 C = CH-(CHR)n -O-(CHR 1 CR 2 R 3)m R 4或(II)H 2 C = CH-(CHR)n -R 5,其中n为0至4的整数,m为0至5的整数 R 1,R 2,R 3和R 4各自独立地为氢或C 1〜C 6烷基,R 5为饱和的含有羰基的烃基,在第一催化剂存在下,得到单体, 并在第二催化剂存在下使所述单体聚合。 本发明还涉及亲水性聚硅氧烷和基于这些聚硅氧烷的弹性体。
摘要:
A silicon-containing film is formed from a heat curable composition comprising (A) a silicon-containing compound obtained by effecting hydrolytic condensation of a hydrolyzable silicon compound in the presence of an acid catalyst, and substantially removing the acid catalyst from the reaction mixture, (B) a hydroxide or organic acid salt of lithium, sodium, potassium, rubidium or cesium, or a sulfonium, iodonium or ammonium compound, (C) an organic acid, and (D) an organic solvent. The silicon-containing film allows an overlying photoresist film to be patterned effectively. The composition is effective in minimizing the occurrence of pattern defects after lithography and is shelf stable.
摘要:
A new silicone condensation reaction, the condensation between an alkoxy silane or siloxane or a dihydric phenol and an organo-hydrosilane or siloxane and catalysts therefore is described and claimed.
摘要:
A synthesis process for polyhedral oligomeric silsesquioxanes that produces in high yield a low resin content, solvent free, and trace metal free monomer suitable for use in microelectronic applications. POSS silanols are reacted with a silane coupling agent in the presence of a solvent and a superbase.
摘要:
A silicon compound containing an epoxy group which is obtainable by subjecting at least one alkoxy silicon compound containing an epoxy group represented by a general formula (1a): R1aSi(OR2)3, wherein R1a represents a substituent having an epoxy group and R2 represents an alkyl group having four or less carbon atoms, by itself, or said compound and at least one substituted alkoxy silicon compound represented by a general formula (1b): R1bSi(OR3)3, wherein R1b represents an alkyl group having ten or less carbon atoms, an aryl group or an unsaturated aliphatic residue, and R3 represents an alkyl group having four or less carbon atoms, to a condensation reaction in the presence of a basic catalyst.