The invention provides a novel oil thickener that can impart a thickening effect for oils used in cosmetics, and a novel oil-soluble copolymer that can be used as the thickener. The cosmetic oil thickener of the invention is an oil-soluble copolymer having a monomer unit composed of a hydrophilic monomer, a monomer unit composed of an easily-crystallizing hydrophobic monomer, and a monomer unit composed of a poorly-crystallizing hydrophobic monomer.

Fluorinated coupling agents and polymerizable compositions including such fluorinated coupling agents and at least one free-radically polymerizable monomer, oligomer, or mixture thereof. Multilayer films including a substrate and at least a first layer overlaying a surface of the substrate also are described, in which the at least first layer includes a (co)polymer obtained by polymerizing the foregoing polymerizable compositions. Processes for making a multilayer film using the polymerizable composition also are taught. Articles including the multilayer film also are disclosed, in which the article preferably is selected from a photovoltaic device, a display device, a solid-state lighting device, a sensor, a medical or biological diagnostic device, an electrochromic device, light control device, or a combination thereof.

Provided is a hydrophilic copolymer containing a structural unit (a) represented by formula (1) and a structural unit (b) represented by formula (2), whereby a coating film having excellent hydrophilicity and antifogging properties can be obtained.

##STR00001##

(In formula (1), R represents a hydrogen atom or a methyl group, R.sup.2 represents (C.sub.2H.sub.4O).sub.mR.sup.6 or (C.sub.3H.sub.6O).sub.mR.sup.6, m represents an integer of 1-50, R.sup.6 represents a hydrogen atom or a C1-6 alkyl group, and X.sup.1 represents a divalent linking group, and in formula (2), R.sup.3 represents a hydrogen atom or a methyl group, R.sup.4 and R.sup.5 each independently represent a C1-10 alkyl group or a C6-10 aryl group, X.sup.2 represents a divalent linking group, n represents an integer of 1-3, and an asterisk * represents a bond to an adjacent structural unit.)

Provided is a hydrophilic copolymer containing a structural unit (a) represented by formula (1) and a structural unit (b) represented by formula (2), whereby a coating film having excellent hydrophilicity and antifogging properties can be obtained.

##STR00001##

(In formula (1), R represents a hydrogen atom or a methyl group, R.sup.2 represents (C.sub.2H.sub.4O).sub.mR.sup.6 or (C.sub.3H.sub.6O).sub.mR.sup.6, m represents an integer of 1-50, R.sup.6 represents a hydrogen atom or a C1-6 alkyl group, and X.sup.1 represents a divalent linking group, and in formula (2), R.sup.3 represents a hydrogen atom or a methyl group, R.sup.4 and R.sup.5 each independently represent a C1-10 alkyl group or a C6-10 aryl group, X.sup.2 represents a divalent linking group, n represents an integer of 1-3, and an asterisk * represents a bond to an adjacent structural unit.)

According to one embodiment, a composition including a compound is provided. The compound includes a linking group containing 2 to 18 carbon atoms, a polymerizable functional group bonded to the linking group, a first reactive group bonded to the linking group, and a second reactive group bonded to the linking group. The polymerizable functional group includes at least one of a (meth)acryloyl group or a vinyl group. The first reactive group includes at least one selected from the group consisting of a thiol group, a disulfide group, and a thiocyanate group. The second reactive group includes at least one selected from the group consisting of an alkoxysilane group, a chlorosilane group, and a hydroxyl group.