The coating composition is prepared by partial co-hydrolysis and co-condensation of a mixture comprising an organotrialkoxysilane or its combination with a tetraalkoxysilane, a fluoroalkylalkoxysilane and a hydroxy-endblocked diorganopolysiloxane in the presence of an acid catalyst. The organopolysiloxanes thus prepared are suitable for coating plastic surfaces to produce a coating on the surfaces, the cured coating film having hardness as well as flexibility sufficient to ensure a very strong resistance to swelling, dissolution or corrosion by attacks of solvents and chemicals.
4229228 - Coating composition - Owned by American Optical Corporation (Southbridge, MA) [*] Notice:The portion of the term of this patent subsequent to November 6, 1996 has been disclaimed.
A coating composition which results from hydrolyzing 35 to 70 weight percent tetraethyl orthosilicate and 60 to 20 weight percent of certain silane is useful for providing abrasion resisting coatings for plastics after curing. Optionally, up to 20 weight percent of a silane having a reactive polar site or, in the alternative, a small percentage of a surfactant may be used to provide a dyeable coated article.
A coating film having a refractive index of from 1.28 to 1.38 and a contact angle of water of from 90.degree. to 115.degree., adhered on a substrate surface, and prepared by reacting a particular tetraalkylsilicate, a particular fluorine-containing silicon compound, a particular hydroxy-containing compound, and oxalic acid in a particular range of ratios and in the absence of water, and under further specified reaction conditions.
There is provided an article which can be produced at a low cost, is excellent in heat resistance, chemical resistance and dimensional accuracy, and has a predetermined surface shape. In particular there is provided an optical waveguide which has high heat resistance and chemical resistance, a large difference in refractive index, small absorption at a communication wavelength of a near infrared range, reliability and a low loss at an optical communication range. The process for producing the article involves disposing a sol-gel material containing specified silanes between a substrate and a mold in the form of a film so as to make the sol-gel material closely contact the substrate and the mold, and heating to form a gelled film having a surface shape which is the inversion of the surface shape of the mold on the surface of the substrate.
A surface coating composition comprising: (A) 100 parts by weight of a partially hydrolyzed condensation product of alkyltrialkoxysilane having the general formula in which R.sup.1 represents an aliphatic hydrocarbon group of C.sub.1 -C.sub.4 or an aromatic hydrocarbon group, and R.sup.2 represents an aliphatic hydrocarbon group of C.sub.1 -C.sub.4 ; (B) 10-100 parts by weight of an organic carboxylic acid of C.sub.1 -C.sub.5 ; and (C) 0.01-1.0 part by weight of an anionic surface active agent containing a fluorocarbon chain.
A fluorinated polysiloxane having at least one unit of the following general formula (1) and containing at least one aminoalkyl group attached to a silicon atom in a molecule is novel. ##STR1## R.sup.1 is a monovalent hydrocarbon group of 1-20 carbon atoms, R.sup.2 is a monovalent hydrocarbon group containing at least three fluorine atoms, R.sup.3 is an organoxy group: --OR.sup.1, and p is 2 to 200. When fibers are treated with the fluorinated polysiloxane, it imparts excellent water and oil repellency and good texture.
