| 摘要 |
1,144,013. Wax-containing coating compositions. TRI-WALL CONTAINERS Inc. 7 March, 1967 [14 April, 1966], No. 10620/67. Headings C4A and C5W. [Also in Division B2] Fire-retardant coating compositions for cellulosic materials comprise a binder containing a major proportion of a hydrocarbon wax, and an intermescent agent. The latter may comprise hexamethylene tetramine plus a non-volatile heat-decomposable inorganic compound, particularly mono- or di-ammonium phosphate, monosodium phosphate, ammonium sulphate, ammonium sulphamate, or borax + boric acid in equal weight ratio. The wax is preferably microcrystalline, and of M.Pt 130-180‹ F. A vinyl polymer may constitute a minor proportion of the binder. Optional additives include dicyandiamide (additional gas-producing agent), clay and starch (pigments/fillers), alum (to improve the ash), and for aqueous dispersions, methyl or hydroxyethyl cellulose, sodium CMC, or sodium alginate (suspending agent). The composition is applied (i) as an aqueous dispersion (preferred) or (ii) as a melt and is preferably overcoated with wax as a melt or aqueous emulsion. Examples 1-10 disclose aqueous dispersions containing about 10% by wt. wax, Example 9 also containing about 3 % by wt. of a polyvinylidene chloride emulsion, and Example 10 being overcoated with an aqueous emulsion of a paraffin, wax, M.Pt. 130‹ C. Examples 11 and 12 disclose dry melts, 11 containing 45% by weight paraffin wax, and 12 containing 19% by wt. petroleium wax, 19% chlorinated diphenyl and 12% vinyl resin. |
