| 摘要 |
1433303 Coated silica and titania DOW CORNING CORP 20 Feb 1974 [20 Feb 1973] 7722/74 Headings C1A and C1N [Also in Divisions B2 and C3] A filler (F) is coated with a polymeric organosilicon compound (S), which inhibits the growth of fungi, bacteria, or algae, having units (I) where: X is an acid anion; each R is independently a C 1-20 hydrocarbon radical; R<SP>1</SP> is a #C 20 hydrocarbon radical or a radical containing only C, H and groups, where R<SP>11</SP> is H or C 1-6 alkyl radical; Y is OH or a hydrolysable radical; and a is 0 or 1. Also present may be substituted siloxanes where R<SP>111</SP> is an optionally halogenated hydrocarbon radical. The fillers (F) may be coated with a solution of the silicon compounds or their hydrolysable predessors, e.g. in water or an organic solvent, followed by drying or heating. Fillers (F) include staple fibres, chopped strands, or beads, or powders, e.g. of TiO 2 , Al 2 O 3 , ZnO, MgO, Fe oxide, CaCO 3 , MgCO 3 , glass, SiO 2 , diatomaceous earth, ground quartz, mica, asbestos, Al silicate, CaAl silicate, MgSiO 3 , or ZrSiO 4 . In the examples, (F) is (1, 2, 3, 5) silica, (4, 9) diatomaceous silica, (6, 7) 10 Ám. crystalline silica (8, 12) fume silica, and (10) TiO 2 . The coated filler is used to fill a polymeric matrix to form an article on or in which the growth of fungi, bacteria, or algae is inhibited. |
