The object of present invention is to provide a transparent film which further improves a slip characteristic of waterdrop. The present invention is a transparent film having a polysiloxane backbone, the transparent film having a structure (a) in which a fluorine-containing group having a perfluoroalkyl group or a perfluoropolyether group on the free end side thereof is bonded to a silicon atom of the polysiloxane backbone, and the transparent film having a slip rate of 0.2 mm/s or more for a 120 μl waterdrop on an 8° incline. In preferred embodiment, the fluorine-containing groups are bonded to some silicon atoms of the polysiloxane backbone in structure (a), and the transparent film has a structure (b) in which carbon fluoride-containing groups or hydrolysable silane oligomer residue are bonded to some of the remaining silicon atoms of the polysiloxane backbone.

An object of the present invention is to provide an antifouling coating composition capable of forming an antifouling coating film that retains a high antifouling performance for a prolonged period of time and has an excellent damage resistance. Another object of the present invention is to provide an antifouling coating film formed with the antifouling coating composition, a substrate with an antifouling coating film and a method for producing the same, and an antifouling method using the antifouling coating film. The antifouling coating composition of the present invention contains a hydrolyzable polymer (A) containing a metal ester group, zinc oxide (B), and medetomidine (C), and has a content of the zinc oxide (B) in a solid content of the antifouling composition of 27 to 60% by mass.

This invention relates to a polymer composition, comprising: water; a water-soluble polymer; and solid particulates of a sequestering agent. The composition may be used for decontaminating, cleaning and/or washing substrates contaminated with contaminants and/or contaminated materials.

A perfluoro(poly)ether group containing silane compound represented by the formula (1a) or the formula (1b):
A-Rf—X—SiQ.sub.kY.sub.3-k  (1a)
Y.sub.3-kQ.sub.kSi—X—Rf—X—SiQ.sub.kY.sub.3-k  (1b)
as defined herein. Also disclosed is a process for producing the compound, a surface-treating agent containing the compound, a pellet containing the surface-treating agent and an optical member including a base material and a layer formed on a surface of the base material from the compound.

A perfluoro(poly)ether group containing silane compound represented by the formula (1a) or the formula (1b):
A-Rf—X—SiQ.sub.kY.sub.3-k  (1a)
Y.sub.3-kQ.sub.kSi—X—Rf—X—SiQ.sub.kY.sub.3-k  (1b)
as defined herein. Also disclosed is a process for producing the compound, a surface-treating agent containing the compound, a pellet containing the surface-treating agent and an optical member including a base material and a layer formed on a surface of the base material from the compound.

A surface treatment composition including a perfluoropolyether group-containing silane compound and a solvent, wherein a proportion of the perfluoropolyether group-containing silane compound based on a total amount of the perfluoropolyether group-containing silane compound and the solvent is in the range from 30 to 99% by mass.

First embodiment of a (meth)acrylic copolymer in the present invention includes following: a (meth)acrylic copolymer having at least one kind of constitutional unit selected from the group consisting of a constitutional unit (A1) having at least one kind of structure (I) selected from the group consisting of structures represented by the following formula (1), formula (2), or formula (3) and a constitutional unit (A2) having a triorganosilyloxycarbonyl group and a constitutional unit (B) derived from a macromonomer (b):

##STR00001## (where, X represents —O—, —S—, or —NR.sup.14—, R.sup.14 represents a hydrogen atom or an alkyl group, R.sup.1 and R.sup.2 each represent a hydrogen atom or an alkyl group having from 1 to 10 carbon atoms, R.sup.3 and R.sup.5 each represent an alkyl group having from 1 to 20 carbon atoms, a cycloalkyl group, or an aryl group, and R.sup.4 and R.sup.6 each represent an alkylene group having from 1 to 10 carbon atoms).

A surface-treating agent containing a fluorine-containing silane compound; and a metal compound, wherein a metal atom contained in the metal compound is one or more metal atoms selected from transition metal atoms of Groups 3 to 11 and typical metal atoms of Groups 12 to 15 of the periodic table.

A surface-treating agent including a component (A) which is at least one fluoropolyether group-containing compound of formula (1A) or (2A) shown below; a component (B) which is at least one fluoropolyether group-containing compound of the following formula (1B) or (2B) shown below; and a component (C) which is one or more fluorine-containing oils:

Rf.sup.1A.sub.α1—X.sup.A—R.sup.A.sub.β1  (1A)

R.sup.A.sub.γ1—X.sup.A—Rf.sup.2A—X.sup.A—R.sup.A.sub.γ1  (2A)

Rf.sup.1B.sub.α2—X.sup.B—R.sup.B.sub.β2  (1B)

R.sup.B.sub.γ2—X.sup.B—Rf.sup.2B—X.sup.B—R.sup.B.sub.γ2  (2B)

wherein formulas (1A), (2A), (1B and (2B) are as defined herein.

A fluoropolyether group-containing compound of the following formula (1) or (2):

R.sup.F1—X—R.sup.Si  (1)

R.sup.Si—X—R.sup.F2—X—R.sup.Si  (2)

wherein R.sup.F1, R.sup.Si and R.sup.F2 are as defined herein.