Disclosed is an electrical steel sheet with an insulating coating formed by applying a surface-treatment agent to at least one surface of the electrical steel sheet and drying the surface-treatment agent, wherein the surface-treatment agent contains: certain trialkoxysilane and/or dialkoxysilane (A); a silane coupling agent (B) that does not contain a polymerizable unsaturated group in its structure; plate-like silica (C); a polymerizable unsaturated-group-containing compound (D); and water, within a range satisfying the following conditions (1) to (3): (1) a mass ratio (A/B) of (A) to (B) is from 0.05 to 1.00; (2) a content of (C) is 2 mass % to 30 mass % with respect to a total mass of (A) to (D) in the surface-treatment agent; and (3) a content of (D) is 2 mass % to 18 mass % with respect to the total mass of (A) to (D) in the surface-treatment agent.

The present invention relates to a polysiloxane copolymer including a structural unit derived from a siloxane-based polymer and a structural unit derived from a silane-based monomer, and a method for preparing the same. The polysiloxane copolymer of the present invention has excellent heat resistance, flexibility, transparency, photosensitivity, durability and the like, and may be widely used as a material in an optical field or/and an electronic field.

According to the present invention, a surface treatment agent which contains a coating composition that contains (A) one or more compounds selected from among organosilane or siloxane compounds represented by formula (1) and partial (hydrolysis) condensation products of the compounds and (B) one or more compounds selected from among silane or siloxane compounds represented by formula (2) and partial (hydrolysis) condensation products of the compounds at a mass ratio of from 50:50 to 90:10 is able to form a cured coating film that has excellently low fingerprint visibility. ##STR00001##
(In formula (1), A represents —C(═O)OR.sup.1, —C(═O)NR.sup.1.sub.2, —C(═O)SR.sup.1 or —P(═O)(OR.sup.1).sub.2; R.sup.1 represents H, an alkyl group, an aryl group or an aralkyl group; Y represents a divalent organic group; R represents an alkyl group or a phenyl group; X represents a hydroxyl group or a hydrolyzable group; and n is 1-3.) ##STR00002##
(In formula (2), Rf represents a perfluoroalkylene group or a divalent perfluoropolyether group.)

According to the present invention, a surface treatment agent which contains a coating composition that contains (A) one or more compounds selected from among organosilane or siloxane compounds represented by formula (1) and partial (hydrolysis) condensation products of the compounds and (B) one or more compounds selected from among silane or siloxane compounds represented by formula (2) and partial (hydrolysis) condensation products of the compounds at a mass ratio of from 50:50 to 90:10 is able to form a cured coating film that has excellently low fingerprint visibility. ##STR00001##
(In formula (1), A represents —C(═O)OR.sup.1, —C(═O)NR.sup.1.sub.2, —C(═O)SR.sup.1 or —P(═O)(OR.sup.1).sub.2; R.sup.1 represents H, an alkyl group, an aryl group or an aralkyl group; Y represents a divalent organic group; R represents an alkyl group or a phenyl group; X represents a hydroxyl group or a hydrolyzable group; and n is 1-3.) ##STR00002##
(In formula (2), Rf represents a perfluoroalkylene group or a divalent perfluoropolyether group.)

The present disclosure provides a method for the surface modification of microstructured components having a polar surface, in particular for high-pressure applications. According to the method, a microstructured component is contacted, in particular treated, with a modification reagent, wherein the surface properties of the component are modified by chemical and/or physical interaction of the component surface and of the modification reagent.

The present disclosure provides a method for the surface modification of microstructured components having a polar surface, in particular for high-pressure applications. According to the method, a microstructured component is contacted, in particular treated, with a modification reagent, wherein the surface properties of the component are modified by chemical and/or physical interaction of the component surface and of the modification reagent.

Functionalized F-POSS compounds comprising synthetic blends of at least two feedstocks that produce a distribution of fluorinated polyhedral oligomeric silsesquioxane molecule structures and/or functional groups.

Functionalized F-POSS compounds comprising synthetic blends of at least two feedstocks that produce a distribution of fluorinated polyhedral oligomeric silsesquioxane molecule structures and/or functional groups.

Reactive poly(fluoroalkyl-functional siloxane) oligomers, method of making the same, and compositions comprising the same are shown and described herein. The reactive poly(fluoroalkyl-functional siloxane) oligomers are is derived from a hydrolysable fluoroalkyl-functional silanes. Coating compositions comprising reactive poly(fluoroalkyl-functional siloxane) oligomer(s) may be used to form a coating or a film on a substrate and impart hydrophobic and/or oleophobic properties. The reactive poly(fluoroalkyl-functional siloxane) oligomer are more hydrophobic and oleophobic and show better chemical resistance than the hydrolysable fluoroalkyl-functional silane.

Reactive poly(fluoroalkyl-functional siloxane) oligomers, method of making the same, and compositions comprising the same are shown and described herein. The reactive poly(fluoroalkyl-functional siloxane) oligomers are is derived from a hydrolysable fluoroalkyl-functional silanes. Coating compositions comprising reactive poly(fluoroalkyl-functional siloxane) oligomer(s) may be used to form a coating or a film on a substrate and impart hydrophobic and/or oleophobic properties. The reactive poly(fluoroalkyl-functional siloxane) oligomer are more hydrophobic and oleophobic and show better chemical resistance than the hydrolysable fluoroalkyl-functional silane.