Compositions are provided which contain (a) one or more polysiloxanes comprising at least one reactive functional group; a plurality of particles; and, optionally, one or more curing agents comprising at least one functional group that is reactive with any reactive functional group of polysiloxane (a). Additionally, a process for applying the multi-component composite coatings described above to a substrate and coated substrates are provided. A process for preparing the coating compositions also is provided. The multi-component composite coating compositions of the invention provide highly scratch resistant color-plus-clearcoatings capable of retaining scratch resistance after weathering.

Coating compositions having improved scratch resistance, coated substrates and methods related thereto

A coating composition which imparts anti-reflective and anti-fog properties to substrates coated therewith. The coating composition utilizes an inorganic metal oxide in combination with silane or a siloxane oligomer. The coating compositions are particularly useful in the manufacture of disposable surgical masks and face shields.

Coating composition having anti-reflective and anti-fogging properties

An article with a patterned surface containing alternating hydrophobic and hydrophilic surface regions. The hydrophobic regions may be sufficiently narrow such that under dew conditions moisture accumulated on the hydrophobic region migrates to the hydrophilic region, thus preventing the accumulation of water droplets. In frost conditions, the hydrophobic region remains relatively frost-free, thus maintaining at least partial transparency of the surface. Inorganic oxide particles on the surfaces of the hydrophobic regions may provide abrasion resistance. A method for making the patterned surfaces is disclosed in which a treatment removes organic binder to expose inorganic oxide particles at the surface of the hydrophilic regions.

Patterned article having alternating hydrophilic and hydrophobic surface regions

Fog formation on transparent substrates constitutes a major challenge in several optical applications requiring excellent light transmission characteristics. Anti-fog coatings are hydrophilic, enabling water to spread uniformly on the surface rather than form dispersed droplets. Despite the development of several anti-fog coating strategies, the long-term stability, adherence to the underlying substrate, and resistance to cleaning procedures are not yet optimal. We report on a polymer-based anti-fog coating covalently grafted onto glass surfaces by means of a multistep process. Glass substrates were first activated by plasma functionalization to provide amino groups on the surface, resulting in the subsequent covalent bonding of the polymeric layers. The anti-fog coating was then created by the successive spin coating of (poly(ethylene-maleic anhydride) (PEMA) and poly(vinyl alcohol) (PVA) layers. PEMA acted as an interface by covalently reacting with both the glass surface amino functionalities and the PVA hydroxyl groups, while PVA added the necessary surface hydrophilicity to provide anti-fog properties. Each step of the procedure was monitored by XPS, which confirmed the successful grafting of the coating. Coating thickness was evaluated by profilometry, nanoindentation, and UV visible light transmission. The hydrophilic nature of the anti-fog coating was assessed by water contact angle (CA), and its anti-fog efficiency was determined visually and tested quantitatively for the first time using an ASTM standard protocol. Results show that the PEMA/PVA coating not only delayed the initial period required for fog formation but also decreased the rate of light transmission decay. Finally, following a 24 hour immersion in water, these PEMA/PVA coatings remained stable and preserved their anti-fog properties.

Characterization of Multilayer Anti-Fog Coatings

Cured coatings having particles at a surface region of the cured coating are provided. Also provided are multi-component composite coatings which include a cured basecoat deposited from a pigmented coating composition and a cured topcoat deposited from a topcoating composition. The multi-component composite coatings of the invention provide highly scratch resistant color-plus-clearcoatings capable of retaining scratch resistance after weathering.

Cured coatings having improved scratch resistance, coated substrates and methods thereto

Disclosed is an anti-fogging film having a multilayer structure comprised of at least two layers of a cured film formed on a substrate. The cured film contains as main components (A) polyvinyl alcohol and (B) at least one member selected from (a) colloidal silica having an average particle size of 5 to 200 mμ, (b) an organic silicon compound of the formula R 1 R 2 a SiX 3-a in which R 1 is an organic group having 1 to 10 carbon atoms, R 2 is a hydrocarbon group having 1 to 6 carbon atoms, X is a hydrolyzable group and a is 0 or 1, and (c) a hydrolysis product of an organic silicon compound of the formula R 1 R 2 .sub. SiX 3-a in which R 1 , R 2 , X and a are as defined above, wherein the ratio S 2 /S 1 of the weight ratio S 2 of component (A) to component (B) in the layer contiguous to the topmost surface layer to the weight ratio S 1 of component (A) to component (B) in the topmost surface layer is at least 1.05.

Anti-fogging film

The invention provides a coating material containing silica fine particles, a siloxane compound, and a curing agent and giving an even coating film in the case it is used for forming a coating film. The invention gives a siloxane-based coating material excellent in storage stability and giving high surface hardness of a coating film when the coating material is used for forming the coating film. The invention also provides an optical article excellent in anti-reflection property and scratching resistance.

Siloxane-Based Coating Material, Optical Article, and Production Method of Siloxane-Based Coating Material

An ornamental article comprising a natural ornamental material such as pearl and a cured coating membrane of a composition based on organic materials which is coated on the surface of said natural ornamental material in a thickness from 0.01 µm to 30µm, with improved properties such as surface luster and resistivity to scratch, light, chemicals, etc.

Ornamental articles having a coating membrane

Siloxane coating material, optical articles and process for the production of siloxane coating materials

An anti-fogging coating having a good and durable anti-fogging property is prepared by coating a composition comprised of as main components, (A) a polyvinyl alcohol, (B) a crosslinking agent, (C) water and (D) a nitrogen-containing organic solvent on a substrate, and heat-curing the coated composition.

Takashi Taniguchi

Papers

Anti-fogging film

Siloxane-Based Coating Material, Optical Article, and Production Method of Siloxane-Based Coating Material

Ornamental articles having a coating membrane

Siloxane coating material, optical articles and process for the production of siloxane coating materials

Process for preparation of anti-fogging coating