초록 ▼

A hydrophilic coating composition used to impart increased lubricity and wettability to the surface of a hydrophobic substrate which is comprised of three essential components: 1) Hydrogel-forming polymer component A 2) Water-soluble polymer component B 3) Common solvent C for the components A and B

A hydrophilic coating composition used to impart increased lubricity and wettability to the surface of a hydrophobic substrate which is comprised of three essential components: 1) Hydrogel-forming polymer component A 2) Water-soluble polymer component B 3) Common solvent C for the components A and B The water-insoluble, hydrogel-forming component A consists of a segmented copolymer with long, hydrophilic terminal blocks and the essentially hydrophobic central section. The two polymer components A and B have a limited miscibility in the absence of a common solvent C. Therefore, their blend tends to separate spontaneously into two polymer phases. The phase separation takes place during the solvent evaporation or extraction. A gradient of hydrophilicity and swelling within the coating layer is thus spontaneously created achieving a good adhesion to the substrate and high surface hydrophilicity at the same time.

대표청구항 ▼

A hydrophilic coating composition for hydrophobic substrates, comprising: A mixture of a hydrogel-forming polymeric component A and a polymeric water-soluble component B in a common solvent C, wherein the said polymer component A is capable of forming a hydrogel containing 50% to 99% water in equili

A hydrophilic coating composition for hydrophobic substrates, comprising: A mixture of a hydrogel-forming polymeric component A and a polymeric water-soluble component B in a common solvent C, wherein the said polymer component A is capable of forming a hydrogel containing 50% to 99% water in equilibrium, and wherein the said component A is a segmented copolymer of a general formula T1－X－T2 wherein T1, T2 are terminal hydrophilic segments and the central section X comprises at least one hydrophobic polymer sequence.