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

##STR00001##

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

A perfluoro(poly)ether group containing silane compound of formula (1a) or (1b):
(Rf-PFPE).sub.β-X—(CR.sup.a.sub.kR.sup.b.sub.lR.sup.c.sub.m).sub.α  (1a)
(R.sup.c.sub.mR.sup.b.sub.lR.sup.a.sub.kC).sub.α—X-PFPE-X—(CR.sup.a.sub.kR.sup.b.sub.lR.sup.c.sub.m).sub.α  (1b)
wherein the symbols are as defined herein.

To provide a composition with which a surface layer excellent in abrasion resistance and sliding resistance can be formed, and an article.

The composition of the present invention comprises a compound represented by the formula (1) and a compound represented by the formula (2), wherein the ratio of the number of moles of the group represented by —CF.sub.3 in R.sup.f1 in the formula (1) to the total of the number of moles of the group represented by —CF.sub.2— closest to Y.sup.1 in R.sup.f2 in the formula (1), the number of moles of the group represented by —CF.sub.2— closest to Y.sup.2 in R.sup.f3 in the formula (2) and the number of moles of the group represented by —CF.sub.2— closest to Y.sup.3 in R.sup.f3 in the formula (2), is from 0.001 to 0.1:

R.sup.f1—(OX.sup.1).sub.m1—O—R.sup.f2—Y.sup.1—[Si(R.sup.1).sub.n1L.sup.1.sub.3-n1].sub.g1  (1)

[L.sup.2.sub.3-n2(R.sup.2).sub.n2Si].sub.g2—Y.sup.2—R.sup.f3—(OX.sup.2).sub.m2—O—R.sup.f4—Y.sup.3—[Si(R.sup.3).sub.n3L.sup.3.sub.3-n3].sub.g3  (2)

The present embodiments relate to an antifouling polymer comprising a plurality of repeating units. At least a portion of the plurality of repeating units comprises medetomidine, or an enantiomer, base or salt thereof, covalently bound to the repeating unit through a hydrolysable bond. The antifouling polymer can comprised in an antifouling composition applied as a surface coating on underwater or submersible structures to prevent or at least inhibit marine biofouling on surfaces of the structures.

The present invention provides a waterborne self-polishing antifouling paint and a preparation method and application thereof, and belongs to the technical field of marine antifouling paints. The waterborne self-polishing antifouling paint provided by the present invention includes the following components in parts by weight: 30-60 parts of waterborne self-polishing emulsion, 30-70 parts of waterborne slurry, 0.1-0.5 parts of waterborne leveling agent, 0.2-1 parts of waterborne defoamer, 0.5-1 parts of film-forming additive and 10-20 parts of water. The waterborne self-polishing antifouling paint provided by the present invention has an ultra-low content of volatile organic compounds (VOCs) (less than 20 g/L), and is environmentally friendly. The waterborne self-polishing antifouling paint can be formed into a paint film with good mechanical properties, stable self-polishing rate, and excellent water immersion resistance and antifouling performance.

A (meth)acrylic copolymer of the present invention includes at least one constituent unit (A) selected from the group consisting of a constituent unit (A1) having at least one structure (I) represented by Formula (1), Formula (2), or Formula (3), a constituent unit (A2) containing a triorganosilyloxycarbonyl group, and a constituent unit (A3) having at least one structure (III) represented by Formula (4) or Formula (5), a constituent unit (B) derived from a specific polysiloxane block-containing polymerizable monomer (b), and a constituent unit (C) derived from a macromonomer (c).

The present application describes novel antifouling coating compositions comprising carbon-based hydrolysable polymers of ethylenically unsaturated monomers of which some include cyclic carbonates or cyclic ethers, e.g. (2,2-dimethyl-1,3-dioxolan-4-yl)methyl (meth)acrylate (IPGA/IPGMA), isopropylidene glycerol ethoxylated acrylate (iPGEOA), isopropylidene glycerol ethoxylated methacrylate (iPGEOMA) and (2-oxo-1,3-dioxolan-4-yl)methyl (meth)acrylate (GCA/GCMA), and their use in antifouling coating compositions. Novel polymers are also described.

The present invention relates to antifouling compositions comprising copper di(ethyl 4,4,4-trifluoroacetoacetate) (Cu(ETFAA)2) that are highly effective against marine biofouling of surfaces of ships and marine structures, their use for inhibiting marine biofouling, as well as antifouling paints comprising said compositions.

The invention relates to a tie-coat composition comprising one or more binder polymers obtainable by copolymerizing a mixture of ethylenically unsaturated monomers, the one or more binder polymers comprising pendant curable alkoxysilyl functional groups of general formula (I) —X-L-Si(R.sup.1).sub.n(OR.sup.2).sub.(3-n) (I) wherein L is a hydrocarbon linker group having 1 to 20 carbon atoms, X is a heteroatom other than a sulphur atom, n is 0, 1, or 2; R.sup.1 is an alkyl radical with 1 to 20 carbon atoms, R.sup.2 is an alkyl radical with 1 to 20 carbon atoms or an alkylalkoxy radical with 2 to 20 carbon atoms, wherein in at least 5 mole % of the curable alkoxysilyl functional groups comprised in the one or more binder polymers the hydrocarbon linker group L is a methyldiyl group (L1) and in at least 5 mole % of the curable alkoxysilyl functional groups comprised in the one or more binder polymers the hydrocarbon linker group L is a hydrocarbon group having 2 to 20 carbon atoms (L2), wherein the tie-coat composition does not comprise a crosslinking agent. The invention further relates to a process for controlling aquatic fouling on a surface of a man-made object comprising applying such tie-coat composition and a topcoat composition, and to a substrate coated with a tie-coat layer deposited from such tie-coat composition and a topcoat layer.

The present invention is to provide an antifouling coating composition capable of forming an antifouling coating film that exhibits a high antifouling performance even in a marine area having a heavy fouling load by animal species such as barnacles, has excellent slime resistance, and is prevented from cracking. Further, the present invention is also to provide an antifouling coating film, a substrate with an antifouling coating film and a method of producing the substrate, and an antifouling method, each using the composition. The antifouling coating composition of the present invention contains a polyorganosiloxane block-containing hydrolyzable copolymer (A) and medetomidine (B), wherein the polyorganosiloxane block-containing hydrolyzable copolymer (A) contains (i) a constituent unit derived from a hydrolyzable group-containing monomer (a1) and (ii) a constituent unit derived from a polyorganosiloxane block-containing monomer (a2).