A cutting and double-face leather integrated dyeing process for Tan sheep skin, which comprises the following steps: cutting.fwdarw.washing with water.fwdarw.retanning.fwdarw.primary dyeing.fwdarw.primary color fixing.fwdarw.secondary dyeing.fwdarw.fatliquoring.fwdarw.secondary color fixing.fwdarw.bleaching.fwdarw.drying.fwdarw.a finished product. Tan sheep skin leather boards and fleeces dyed by the process of the invention have no cross color and color fading with each other, a high color fastness, and uniform dyeing; the prepared Tan sheep skin products such as clothing, etc., not only have the characteristics of a high added value and good practicability, but also can more largely increase product benefits and lower the production cost.

The present invention discloses a process for preparing a flame-retardant, lightfast, low fogging and degradable car seat leather wherein ammonia salt deliming is replaced with an ammonia free one, tetrakis hydroxymethyl phosphonium sulfate and the flame-retardant starchy leather surfactant are used as the tanning agents to replace the conventional chrome tanning agent, hot water washing is used to reduce the fogging value of the seat leather, the flame-retardant performance is enhanced by combination of retanning, greasing and coating, the lightfast material is applied to enhance the lightfastness of the coating and the spray coating is replace with the roller coating to lower the consumption of the paints.

The present invention discloses a process for preparing a flame-retardant, lightfast, low fogging and degradable car seat leather wherein ammonia salt deliming is replaced with an ammonia free one, tetrakis hydroxymethyl phosphonium sulfate and the flame-retardant starchy leather surfactant are used as the tanning agents to replace the conventional chrome tanning agent, hot water washing is used to reduce the fogging value of the seat leather, the flame-retardant performance is enhanced by combination of retanning, greasing and coating, the lightfast material is applied to enhance the lightfastness of the coating and the spray coating is replace with the roller coating to lower the consumption of the paints.

The present invention relates to a novel composition for waterproofing leather, hides and/or pelts comprising a carboxyl-functional polysiloxane or an epoxide-functional polysiloxane and a polymer dispersion that contains 2 to 35 weight % of carboxylic groups, preferably a polyacrylate dispersion, to obtain leather that has a good water resistance according to ISO DIN EN ISO 5403-2 and DIN EN ISO 5403-1.

The present invention relates to a novel composition for waterproofing leather, hides and/or pelts comprising a carboxyl-functional polysiloxane or an epoxide-functional polysiloxane and a polymer dispersion that contains 2 to 35 weight % of carboxylic groups, preferably a polyacrylate dispersion, to obtain leather that has a good water resistance according to ISO DIN EN ISO 5403-2 and DIN EN ISO 5403-1.