| 摘要 |
A process is disclosed for imparting fire retardancy to upholstery fabrics formed principally of polypropylene fibers and involving the use of known fire retardant compositions comprised of a mixture of bromochlorinated paraffin and antimony oxide. The exceptional fire retardancy of the known composition is realized without imparting to the fabric an oily surface characteristic by further incorporating into the mixture a substantial quantity of metal hydrate, such as aluminum oxide trihydrate, in the form of a fine powder. The aluminum oxide trihydrate, in addition to having some fire retardant characteristics of its own, provides an enormous surface area for adsorption of the oily composition forming the primary fire retardant material. This new composition, advantageously in the form of a foam, is applied only to the back surface of the fabric. Two major advantages are realized: First, the oily composition is isolated from the front surface of the fabric. Secondly, since most polypropylene-based upholstery fabrics require a back coating operation in any event to provide adequate seam strength, the ability to introduce the fire retardancy during the back coating operation eliminates a separate production procedure and thus reduces the cost of manufacture.
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