Paint composition, proces for producing wear-resistant coating film using the same, and wear-resistant coating film comprising the same

A process for producing a wear-resistant coating film, comprising the steps of:

• preparing a paint composition comprising:
• a layer organic-inorganic composite;
• and
• titanium alkoxide in an amount of from 1 to 50 parts by weight with respect to the layer organic-inorganic composite taken as 100 parts by weight;
• the layer organic-inorganic composite composed of a laminated substance comprising:
• a tetrahedral structural layer made of tetrahedral structures whose central atom M′ is Si or a first metallic atom substituting for a part the Si, at least a part of the central atom M′ covalent-bonded to an organic group R involving or free from a polymerizable functional group;
• and
• an octahedral structural layer made of octahedral structures whose central atom M is a second metallic atom;
• and
• the layer organic-inorganic composite expressed by a general formula, {RnM′O(4−n)/2}x(MOz/2)(H2O)w, wherein n is an integer of from 1 to 3, x is from 0.5 to 2.0, z is the valence number of the central atom M and is an integer of from 2 to 4, and w is the number of crystal water molecules and is an integer falling in a range of from {(z/2)−1} to (z+1)/2;
• coating the paint composition on a surface of a resinous substrate;
• and
• forming a wear-resistant coating film by giving a physical stimulus to the paint composition to cause the paint composition to react and cure.

A wear-resistant coating film, comprising:

• a paint composition coated on a surface of a resinous substrate, and comprising:
• a layer organic-inorganic composite;
• and
• titanium alkoxide in an amount of from 1 to 50 parts by weight with respect to the layer organic-inorganic composite taken as 100 parts by weight;
• the layer organic-inorganic composite composed of a laminated substance comprising:
• a tetrahedral structural layer made of tetrahedral structures whose central atom M′ is Si or a first metallic atom substituting for a part the Si, at least a part of the central atom M′ covalent-bonded to an organic group R involving or free from a polymerizable functional group;
• and
• an octahedral structural layer made of octahedral structures whose central atom M is a second metallic atom;
• and
• the layer organic-inorganic composite expressed by a general formula, {RnM′O(4−n)/2}x(MOz/2)(H2O)w, wherein n is an integer of from 1 to 3, x is from 0.5 to 2.0, z is the valence number of the central atom M and is an integer of from 2 to 4, and w is the number of crystal water molecules and is an integer falling in a range of from {(z/2)−1} to (z+1)/2;
• and
• the wear-resistant coating film further comprising:
• organic cross-links formed by polymerization of the polymerizable functional groups of the layer organic-inorganic composite and the polymerizable functional groups of the other layer organic-inorganic composites neighboring the layer organic-inorganic composite, the polymerization induced by a physical stimulus given to the paint composition;
• and
• inorganic cross-links formed by a reaction between the titanium alkoxide, reacted with and bonded to end hydroxide groups of at least one of the tetrahedral structures and octahedral structures of the layer organic-inorganic composite, and the other titanium alkoxides, reacted with and bonded to end hydroxide groups of at least one of the tetrahedral structures and octahedral structures of the other layer organic-inorganic composites neighboring the layer organic-inorganic composite, the reaction induced by the physical stimulus given to the paint composition.