Article with antifogging film and process for producing the same

An antifogging article prepared by a process comprising:

• preparing a first coating solution by dissolving a water-absorbing organic polymer and a silicon-containing compound in a solvent;
• applying said first coating solution to a substrate, thereby forming a first precursory film on said substrate;
• drying said first precursory film into an antifogging film;
• applying a second coating solution to said antifogging film, thereby forming a second precursory film on said antifogging film;
• and
• drying said second precursory film into a water repellent film.

A process for producing an antifogging article, comprising:

• preparing a first coating solution by dissolving a water-absorbing organic polymer and a silicon-containing compound in a solvent;
• applying said first coating solution to a substrate, thereby forming thereon a first precursory film;
• drying said first precursory film into an antifogging film;
• applying a second coating solution to said antifogging film, thereby forming a second precursory film on said antifogging film;
• and
• drying said second precursory film into a water repellent film.

An antifogging article comprising:

• a substrate;
• a water-absorbing, antifogging film covering said substrate, said antifogging film comprising:
• (a) a polyvinyl acetal resin having a degree of acetalization of not greater than 10 mol %;
• and
• (b) a hydrolysate or partial hydrolysate of an alkylsilylisocyanate represented by the general formula R2nSiR14-n where R1 is an alkyl group having a carbon atom number of 1 or 2, R2 is an isocyanate group, and n is 1 or 2;
• and
• a water-permeable, protective film covering said antifogging film.

An antifogging article prepared by a process comprising:

• (a) providing a substrate;
• (b) preparing a first coating liquid by adding a polyvinyl acetal resin and an alkylsilylisocyanate to a solvent, said polyvinyl acetal resin having a degree of acetalization of not greater than 10 mol %, said alkylsilylisocyanate being represented by the general formula R2nSiR14-n where R1 is an alkyl group having a carbon atom number of 1 or 2, R2 is an isocyanate group, and n is 1 or 2;
• (c) applying said first coating liquid to said substrate, thereby forming a first precursory film on said substrate;
• (d) drying said first precursory film into a water-absorbing, antifogging film;
• (e) applying a second coating liquid containing an alkylsilylisocyanate to said antifogging film, said alkylsilylisocyanate being represented by the general formula R2nSiR14-n where R1, R2 and n are defined as above, thereby forming a second precursory film on said antifogging film;
• and
• (f) drying said second precursory film into a water-permeable, protective film.

A process for producing an antifogging article, comprising:

• (a) providing a substrate;
• (b) preparing a first coating liquid by adding a polyvinyl acetal resin and an alkylsilylisocyanate to a solvent, said polyvinyl acetal resin having a degree of acetalization of not greater than 10 mol %, said alkylsilylisocyanate being represented by the general formula R2nSiR14-n where R1 is an alkyl group having a carbon atom number of 1 or 2, R2 is an isocyanate group, and n is 1 or 2;
• (c) applying said first coating liquid to said substrate, thereby forming a first precursory film on said substrate;
• (d) drying said first precursory film into a water-absorbing, antifogging film;
• (e) applying a second coating liquid containing an alkylsilylisocyanate to said antifogging film, said alkylsilylisocyanate being represented by the general formula R2nSiR14-n where R1, R2 and n are defined as above, thereby forming a second precursory film on said antifogging film;
• and
• (f) drying said second precursory film into a water-permeable, protective film.