Composition for matte layer formation, release sheet using the same, and synthetic leather produced using said release sheet

Abstract

There are provided a composition for matte layer formation suitable for the production of a matte synthetic leather having a matte surface with a high level of jet-blackness even without the practice of embossing, raising, etc., and a release sheet for the production of a matte synthetic leather by using the composition. The composition for matte layer formation suitable for the production of a matte synthetic leather comprises a thermosetting resin and a matting agent as indispensable components. The matting agent comprises one or at least two types of organic or/and inorganic porous fine particles. The porous fine particles have a mean particle diameter in the range of 0.5 to 20 μm and a specific surface area in the range of 1 to 1000 m 2 /g. The release sheet is produced by using the composition.

1 . A synthetic leather comprising a release sheet comprising:
 a matte layer formed by coating a composition for matte layer formation suitable for the production of a synthetic leather, said composition comprising a thermosetting resin and a matting agent as indispensable components, said matting agent comprising one or at least two types of organic or/and inorganic porous fine particles, said porous fine particles having a mean particle diameter in the range of 0.5 to 20 μm and a specific surface area in the range of 1 to 1000 m 2 /g; and   a substrate for supporting the matte layer,   said matte layer having a fine concave-convex portion on its surface, said concave-convex portion having an arithmetical mean roughness (Ra) of 0.5 to 15 μm   
   
   
       2 . The synthetic leather according to  claim 1 , wherein a skin as the outermost layer in the synthetic leather is a transparent resin layer. 
   
   
       3 . The synthetic leather according to  claim 2 , wherein the transparent resin layer is releasable. 
   
   
       4 . The synthetic leather according to  claim 1 , which has been produced substantially without embossing or/and raising. 
   
   
       5 . A synthetic leather produced by using a release sheet, said synthetic leather having a surface arithmetical roughness (Ra) of 0.5 to 15 μm and a 85-degree glossiness of 0.5 to 10%.