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AssigneeShin-Etsu Chemical Co., Ltd.
InventorsAkihiro KOBAYASHI, Shunji AOKI
Estimating the term…
A silicone emulsion composition capable of being formed into a coating film, which contains: (A) 100 parts by mass of an organopolysiloxane containing, per molecule, at least two groups each capable of binding to a silicon atom, wherein the at least two groups are independently selected from a hydroxyl group and an alkoxy group; (B) 0.1 to 50 parts by mass of a surfactant; (C) 0.01 to 10 parts by mass of at least one substance selected from cellulose and a cellulose derivative; (D) 0.5 to 50 parts by mass of colloidal silica; and (E) 50 to 1,000 parts by mass of water.
A film-forming silicon emulsion composition comprising:
Dependencies are inferred from the claim text.
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Alkyl ethers: with hydroxylated hydrocarbon radicals
Polysiloxanes: containing silicon bound to oxygen-containing groups
Manufacture of articles or shaped materials containing macromolecular substances: manufacture of films or sheets
Alkyl ethers: substituted with acid radicals, e.g. carboxymethyl cellulose [CMC]
Term end not estimated
The present invention relates to a silicone emulsion composition. More particularly, the invention relates to a film-forming silicone emulsion composition containing no organotin compounds or inorganic tin compounds as curing catalysts, and to a cured film obtained from the composition.
Rubber film-forming silicone emulsion compositions of various formulations have hitherto been known, and are used as, for example, weather stripping materials and coating agents for airbags.
Examples include silicone emulsion compositions made of a hydroxylated diorganopolysiloxane, a colloidal silica and an organotin compound or an organic amine compound (Patent Document 1: JP-A S56-16553), silicone latex compositions made of a siloxane block copolymer consisting of dimethylsiloxane units and monophenylsiloxane units, water, a cationic surfactant, a filler and an aminosilane (Patent Document 2: U.S. Pat. No. 3,817,894), silicone emulsion compositions made of a hydroxyl group-containing organopolysiloxane, a Si—H group-containing organopolysiloxane, colloidal silica, an amide group and carboxyl group-containing silane, an epoxy group-containing silane and a curing catalyst (Patent Document 3: JP-A H08-85760), silicone emulsion compositions made of an alkenyl group-containing organopolysiloxane, an Si—H group-containing organopolysiloxane, colloidal silica, the reaction product of an aminosilane with an acid anhydride, an epoxysilane and an addition reaction catalyst (Patent Document 4: JP-A H09-208826), and silicone emulsion compositions made of a hydrogensiloxane that is end-capped with hydroxyl groups, an emulsifying agent, water and a curing catalyst (Patent Document 5: JP-A H09-208900).
The invention is described in detail below.
Component (A) is an organopolysiloxane having at least two groups selected from silicon-bonded hydroxyl groups and alkoxy groups per molecule. One type may be used alone or two or more types may be used in combination. Component (A) may be linear or branched, with a branched organopolysiloxane being preferred. Of these, one of average compositional formula (1) below is preferred.
In the formula, R1 and R2 are each independently a hydrogen atom, a hydroxyl group, or a substituted or unsubstituted monovalent hydrocarbon group or alkoxy group of 1 to 20 carbon atoms, and at least two groups selected from silicon-bonded hydroxyl groups and alkoxy groups are included per molecule. The subscripts a, b, c and d are each numbers which satisfy the conditions a≥2, b≥5, c≥0, d≥0 and 10≤a+b+c+d≤15,000.