| 摘要 |
795,176. Surface covering compositions. ARMSTRONG CORK CO. Jan. 10, 1956 [April 18, 1955], No. 807/56. Class 140. A method for producing a surface covering in which stove-staining is substantially eliminated, comprises the steps of applying a siccative oil-resin composition to a felt-supporting layer containing proteinaceous material which has been pretreated with a tanning agent, and curing said composition at elevated temperatures. The tanning agents specified are aldehydes (including aldoses), e.g. formaldehyde, paraformaldehyde, glyoxal and dextrose; tanning metal salts, e.g. aluminium sulphate, chrome alum, calcium sulphate and nickel sulphate; polybasic organic acids, e.g. oxalic, citric, succinic, maleic or phthalic acids; polysulphonic acids, e.g. sulphonate polystyrene ; natural tannins; syntans and ketones and ketoses, e.g. fructose, acetone and dihydroxy acetone. The siccative oil-resin composition may comprise drying oils, semidrying oils or tall oil esters with rosin, copals kauri gum, congo gum, urea-formaldehyde resin, phenol-formaldehyde rosin or petroleum residues. The water-soluble tanning agents may be applied in aqueous solution to the proteinaceous material either before or after the felt is formed, and those that are insoluble in water may be applied in a suspension or slurry. According to the tanning efficiency of the tanning agents varying amounts of tanning agents are applied to the proteinaceous material but the preferred amount is that equal by weight to the weight of the proteinaceous material present in the felt. It is stated in the Specification that the tanning reaction need not take place prior to the curing operation, since as long as the tanning agent is present the reaction will proceed at the elevated temperatures used for curing the siccative oilresin composition. |
