Abstract: The present invention provides an end-modified diene copolymer having excellent compatibility with silica as a reinforcement material, and a preparation process thereof, in which the end-modified diene copolymer is prepared by preparing a living polymer of a conjugated diene monomer and/or a vinyl aromatic monomer, modifying the living polymer with a reactive organosiloxane compound, and then modifying the end of the living polymer, to which the organosiloxane compound has not been coupled, with an organosilane compound having various functional groups. When the end-modified diene copolymer is used as a rubber material in the manufacture of a silica tire, the dispersion of silica in the copolymer can be improved and the bonding strength between silica and the rubber can be significantly increased, thereby manufacturing a high-quality silica tire.

Abstract: By a method comprising a process including (a) producing a modified conjugated diene polymer through reaction of a conjugated diene polymer having an alkali metal or alkaline-earth metal active terminal with a first alkoxysilane compound which has both an alkoxysilyl group and at least one group convertible into an onium, and (b) mixing the modified conjugated diene polymer, an agent for producing onium, a second alkoxysilane compound having an alkoxysilyl group and at least one group convertible into an onium and a condensation catalyst containing metal element(s) for alkoxysilane compounds, conjugated diene rubber usable as a starting material of cross-linked rubber which is used for a tire tread or the like and allows enhancement of low fuel consumption property can be obtained.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of polymerizing monomer with a coordination catalyst to form a reactive polymer and reacting the reactive polymer with a nitrile compound containing a protected amino group.

Abstract: Organosilicon compounds are represented by the following formula: wherein R is a hydrolyzable group, R? is an alkyl having 1 to 4 carbon atoms, A is an alkylene having 1 to 6 carbon atoms, X is O or S, Y is —NH— or S, L1 and L2 are C or N, Z and M are —NH—, O or S, R1 to R11 are H, alkyl having 1 to 6 carbon atoms, alkoxy or fluoroalkyl, or amino, m is 1 to 3, and n is 0 to 3. R1 and R2 or R2 and R3 may bonded together. R5 and R6 or R9 and R10 may directly bond together. R4 and R7 or R8 and R11 may form a ring skeleton. Their production processes, pressure-sensitive adhesive compositions, self-adhesive polarizers and LCDs are also disclosed.

Abstract: A process for producing conjugated diene rubber and its composite includes polymerizing a conjugated diene or a conjugated diene and a vinyl aromatic hydrocarbon in a hydrocarbon solution by anionic polymerization to obtain conjugated diene rubber containing alkali metal in the polymer chain end reacting a with at least one organic silane compound to become a modified conjugated diene rubber. After or during the modified conjugated diene rubber contacting with large amount of water, solvent and water content are removed from the modified conjugated diene by applicable hot sources, wherein coupling ratio of modified conjugated diene rubber is less than 40%, coupling ratio of modified conjugated diene rubber after contact with water is at least 50% The conjugated diene rubber and composite exhibit storage stability.

Abstract: Organosilicon compounds are represented by the following formula: wherein R is a hydrolyzable group, R? is an alkyl having 1 to 4 carbon atoms, A is an alkylene having 1 to 6 carbon atoms, X is O or S, Y is —NH— or S, L1 and L2 are C or N, Z and M are —NH—, O or S, R1 to R11 are H, alkyl having 1 to 6 carbon atoms, alkoxy or fluoroalkyl, or amino, m is 1 to 3, and n is 0 to 3. R1 and R2 or R2 and R3 may bonded together. R5 and R6 or R9 and R10 may directly bond together. R4 and R7 or R8 and R11 may form a ring skeleton. Their production processes, pressure-sensitive adhesive compositions, self-adhesive polarizers and LCDs are also disclosed.

Abstract: Disclosed is a curable silicone composition for preparing release layers and pressure sensitive adhesives, and to substrates bearing a layer of the cured composition. More specifically, this invention relates to a silicone composition, curable in the absence of both catalysts and actinic radiation comprising a cyclic anhydride copolymer and an amine-terminated polysiloxane.

Abstract: The present invention provides a porous hollow silica micro- or nanoparticle with a polymer grafted thereon, wherein the polymer is selected from poly(methacrylic acid) and copolymers thereof. The polymer may be covalently linked to the silica particle via a bridging group. Provided is also a method of covalently coupling a poly(methacrylic acid) to a silica surface of a hollow silica particle. The method comprises contacting a silica surface of a hollow silica particle that carries amino functional or halogen functional groups with a poly(methacrylic acid) or a copolymer or a respective monomer thereof. The method further comprises allowing the carboxyl group of the monomer or the poly(methacrylic acid) and an amino functional group or a halogen functional group on the silica surface to undergo a coupling reaction, thereby covalently coupling the polymer to the silica surface.

Abstract: A resin composition for laser engraving, including: a binder polymer; and a metal compound containing a metal selected from the group consisting of metals in Group 1 to Group 15 in the periodic table.

Abstract: A sulfur-containing anionic polymerization initiator defined by the formula: R1S—R2aR3?Li? where R1 is a monovalent organic group, R2 is a divalent organic group, R3 is a divalent organic group or a bond, and a is an integer from 1 to about 5.

Abstract: The present invention aims to provide a curable composition that, while having practical curability, gives a cured product with excellent recovery, and exhibits excellent curability as well as excellent water-resistant adhesion. The curable composition includes 100 parts by weight of a reactive silyl group-containing organic polymer (A); 0.1 to 10 parts by weight of a dialkyltin disilicate compound (B); and an amino silane coupling agent (C), the dialkyltin disilicate compound (B) being a tin compound containing a bulky alkyl group and a silicate moiety with a C1 or C2 alkoxy group, and the amino silane coupling agent (C) including 1 to 10 parts by weight of an amino silane coupling agent (C1) containing a trialkoxysilyl group, and less than 1 part by weight of an amino silane coupling agent (C2) containing a dialkoxysilyl or monoalkoxysilyl group.

Abstract: To provide a producing method of conjugated diene rubber which can be used as a starting material of cross-linked rubber which is used for such as tire tread and can enhance low fuel consumption performance.

Abstract: Moisture curable one-component organosilicon compositions exhibiting excellent resilience and adhesiveness contain an ?-alkoxysilyl-terminated base polymer, aminoalkylalkoxysilane adhesion promoter, and polyolefin bearing succinic anhydride groups.

Abstract: A method for producing a modified conjugated diene-based polymer, wherein the method comprises: a first step of producing a conjugated diene-based polymer by polymerizing monomers comprising a conjugated diene compound in a hydrocarbon solvent using an organoalkali metal compound and a second step of adding (I) a compound having a carbonyl group and a substituted amino group and (II) a compound represented by Formula (II-A) to a hydrocarbon solvent containing the conjugated diene-based polymer.

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing monomer with a coordination catalyst to form a reactive polymer; and (ii) reacting the reactive polymer with a nitrile compound containing a protected amino group.

Abstract: Organosilicon compounds are represented by the following formula: wherein R is a hydrolyzable group, R? is an alkyl having 1 to 4 carbon atoms, A is an alkylene having 1 to 6 carbon atoms, X is O or S, Y is —NH— or S, L1 and L2 are C or N, Z and M are —NH—, O or S, R1 to R11 are H, alkyl having 1 to 6 carbon atoms, alkoxy or fluoroalkyl, or amino, m is 1 to 3, and n is 0 to 3. R1 and R2 or R2 and R3 may bonded together. R5 and R6 or R9 and R10 may directly bond together. R4 and R7 or R8 and R11 may form a ring skeleton. Their production processes, pressure-sensitive adhesive compositions, self-adhesive polarizers and LCDs are also disclosed.

Abstract: A conjugated diene polymer is provided that comprises a conjugated diene-based constituent unit and a constituent unit of formula (I) below, at least one terminus of the polymer being modified by a compound of formula (II): wherein X1, X2, and X3 independently denote a group of formula (Ia) below, a hydroxy group, a hydrocarbyl group, or a substituted hydrocarbyl group, and at least one of X1, X2, and X3 is a group of formula (Ia) below or a hydroxy group, wherein R1 and R2 independently denote a hydrocarbyl group having 1 to 6 carbon atoms, a substituted hydrocarbyl group having 1 to 6 carbon atoms, a silyl group, or a substituted silyl group, and R1 and R2 may be bonded so as to form, together with the nitrogen atom, a ring structure, wherein n denotes an integer of 1 to 10, R3, R4, and R5 independently denote a hydrocarbyl group having 1 to 4 carbon atoms or a hydrocarbyloxy group having 1 to 4 carbon atoms, at least one of R3, R4, and R5 is a hydrocarbyloxy group, and A denotes a

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of: (i) polymerizing monomer with an anionic initiator to form a reactive polymer; and (ii) reacting the reactive polymer with a nitrile compound containing a protected amino group, where the protected amino group is directly attached to a moiety selected from the group consisting of acyclic moieties, heterocyclic moieties, and non-aromatic cyclic moieties.

Abstract: A functionalized polymer includes a directly bonded moiety, which can be located at a terminus of the polymer, defined by the formula CR1R2NH—O—]—Si where each R1 and R2 independently is a substituted or unsubstituted hydrocarbyl group and where the Si atom can be bonded through similar moieties to up to three other polymers and/or to the appropriate number of non-interfering groups. The polymer can be provided by introducing a ketoximesilane compound into a system that includes carbanionic (living) polymer. Such polymers can be used in the production of compositions that include particulate fillers.

Abstract: A macromolecule includes at least one polymer chain and terminal functionality. The terminal functionality includes a ring-opened radical of a cyclosilazane or cyclic hydrosiloxane. The polymer can include unsaturated mer units and can be provided via anionic polymerization techniques. The macromolecule can be used as a component of a composition that also includes particulate fillers, with the composition being useful for the production of vulcanizates.

Abstract: This invention relates to a process of making a group of silylated poly(N-alkyl-4-vinylpyridinium) quaternized salts suitable for use as coating materials for the treatment of substrate surfaces to impart an antimicrobial effect.

Abstract: Disclosed are a conjugated diene-based polymer from which a polymer composition excellent in fuel cost-saving properties and elongation at break can be obtained, a polymer composition containing the conjugated diene-based polymer and a reinforcing agent, and a process for producing the conjugated diene-based polymer. A conjugated diene-based polymer obtained by reacting one end of a polymer having a monomer unit based on a conjugated diene, a monomer unit based on a compound represented by the following formula (1), and a monomer unit based on a compound represented by the following formula (2) with an alkoxysilane compound. V1—S1??(1) wherein V1 represents a hydrocarbyl group having a polymerizable carbon-carbon double bond, and S1 represents a substituted silyl group. V2-A2??(2) wherein V2 represents a hydrocarbyl group having a polymerizable carbon-carbon double bond, and A2 represents a substituted amino group, or a nitrogen-containing heterocyclic group.

Abstract: Provided are a rubber composition for a sidewall reinforcing layer and a run-flat tire that reduce heat build-up, enhance elongation at break at high temperature, and increase run-flat durability, while maintaining good rigidity. The composition contains a rubber component including tin-modified BR (a) and/or BR (b) modified by a compound of formula (1); and an alkylphenol-sulfur chloride condensate, wherein an amount of the alkylphenol-sulfur chloride condensate is 3-10 parts by mass per 100 parts by mass of the rubber component: wherein R1, R2, and R3 may be the same as or different from one another and each represent an alkyl group, an alkoxy group, a silyloxy group, an acetal group, a carboxyl group, a mercapto group, or a derivative thereof; R4 and R5 may be the same as or different from each other and each represent a hydrogen atom or an alkyl group; and n denotes an integer.

Abstract: There is provided a method of producing a conjugated diene rubber capable of being used as a starting material for a crosslinked rubber that can be used in applications such as tire treads and can raise the fuel efficiency.

Abstract: Compositions and methods for producing polymerization initiators comprising at least two protected primary amine groups. Polymers prepared using such polymerization initiators can comprise a residue of the polymerization initiator and can initially comprise the at least two protected primary amine groups. Such polymers can undergo a deprotection process thereby yielding a polymer having one or more unprotected primary amine groups. Polymers having primary amine groups can be employed in rubber compositions, which have a variety of potential applications, such as, for example, in tire manufacturing.

Abstract: Two-component or multi-component fixing mortar, based on a free-radical-hardening unsaturated reactive resin, for embedding anchoring means in mortar in holes or crevices, which fixing mortar includes silanes which may or may not have reactive groups capable of participating in the polymerisation with a synthetic resin based on free-radical-hardening unsaturated reactive resins but do in any case have Si-bonded hydrolysable groups, and, physically separate therefrom, a hardener.

Abstract: A hydrophobic ABS plastics material is formed from an acrylonitrile-butadiene-styrene copolymer (ABS) plastic feed stock and a silicone additive. The hydrophobic ABS plastics material is used to produce a casing material, and also an electrical device. The hydrophobic ABS plastics material is ideally suited for protecting sensitive electronic components from moisture via a casing.

Abstract: Polymers comprising residues of cage compound monomers having at least one polyalkoxy silyl substituent are provided. The cage compound monomers are selected from borane cage compound monomers comprising at least 7 cage atoms and/or carborane cage compound monomers comprising 7 to 11 cage compound monomers. Such polymers can further comprise one or more reactive matrices and/or co-monomers covalently bound with the cage compound monomer residues. Articles of manufacture comprising such polymers are also disclosed.

Abstract: The use of a functionalized organosilicon compound as a coupling agent between an inorganic filler and an elastomer in an elastomer composition including an isoprene elastomer and a reinforcing inorganic filler is disclosed. The compound is selected among functionalized organosilicon compounds including at least one double bond C?C or C?N, and not including any C?C—C?O bonds or N?N bonds, and reacting with the isoprene units according to an electrocyclic reaction, in particular according to a standard cycloaddition reaction [2+1], [2+2], [3+2] or a Diels-Alder reaction [4+2] or an ene-synthesis reaction other than an ene-synthesis reaction between an isoprene unit and a C?C—C?O or N?N function. Also described, are elastomer composition(s) obtained and items manufactured using such compositions.

Abstract: The present invention provides an organopolysiloxane obtained by binding, to at least two silicon atoms of an organopolysiloxane segment constituting a main chain, a poly(N-acylalkyleneimine) segment composed of a repeating unit represented by the following formula (1): wherein R1 represents a hydrogen atom or an alkyl group having from 1 to 3 carbon atoms and n is 2 or 3, via an alkylene group containing a hetero atom, wherein the poly(N-acylalkyleneimine) segment has a number-average molecular weight of from 1,600 to 3,500; a mass ratio (a/b) of the organopolysiloxane segment (a) constituting the main chain to the poly(N-acylalkyleneimine) segment (b) (which will hereinafter be called “mass ratio (a/b)”, simply) is from 42/58 to 58/42; the organopolysiloxane segment between two poly(N-acylalkyleneimine) segments adjacent to each other has a weight-average molecular weight of from 1,600 to 3,500; and the organopolysiloxane segment constituting the main chain has a weight-average molecular weight of 7,000

Abstract: The invention provides a fluoropolymer composition capable of improving the characteristics of the cured material obtained therefrom. A fluoropolymer composition comprising a methylene group-containing fluoropolymer (A) and a hydrosilylation catalyst (B), wherein the methylene group-containing fluoropolymer (A) has methylene group-containing repeating units in the main chain thereof and is capable of hydrosilylation in the presence of the hydrosilylation catalyst (B) and one terminus of the chain is a carbon-carbon double bond or an Si—H group and the other terminus of the chain is an Si—H group or a carbon-carbon double bond.

Abstract: Method for efficiently producing ?-hetero-substituted alkylhalohydrosilane, and use thereof. A method for producing (A) a halohydrosilane compound represented by the general formula (1): H—SiR2c(CR13-bYb)aX3-a-c??(1) (wherein, R1 represents a hydrogen atom or a substituted or unsubstituted hydrocarbon group; R2 represents a substituted or unsubstituted hydrocarbon group; X represents a halogen atom; Y represents a hetero substituent; a is 1 or 2; b is any one of 1, 2 and 3; c is 1 or 0), by allowing (B) a halosilane compound represented by the general formula (2): SiR2c(CR13-bYb)aX4-a-c??(2) (wherein, R1, R2, X, Y, a, b and c are as defined above) to react with (C) a hydrosilane compound. A method for producing a reactive silicon group-containing polymer using the halohydrosilane compound (A).

Abstract: A method for preparing a functionalized polymer, the method comprising the steps of (i) polymerizing monomer with a coordination catalyst to form a reactive polymer; and (ii) reacting the reactive polymer with a carboxylic or thiocarboxylic ester containing a silylated amino group.

Abstract: A process for producing a rubber composition which includes mixing a silica and a sulfur-containing organic silicon compound represented by general formula (1): or the general formula (2): under a temperature of 130° to 180° C. to produce a surface-treated silica; and combining the surface-treated silica with a rubber component.

Abstract: A modified conjugated diene-vinyl aromatic copolymer and a method for manufacturing the same are provided. The modified conjugated diene-vinyl aromatic copolymer is formed by modifying a conjugated diene-vinyl aromatic copolymer by reacting with a first modifier in a solvent and then reacting with a second modifier. The solvent contains an organic alkali metal initiator. The first modifier is expressed as chemical formula (I): The second modifier is expressed as chemical formula (II): R1 is selected from one of hydrogen, methyl group or ethyl group. R2 is selected from hydrogen. R3 is selected from one of hydrogen, methyl group or ethyl group. X is selected from one of epoxypropoxy group, isocyanate group or 2-(3,4-epoxycyclohexyl) group. R4 is selected from one of alkyl groups with 2˜3 carbon atoms.

Abstract: Methods for bonding polymeric substrates to hydroxylated surfaces such as glass are disclosed. The polymeric substrates may be elastomeric substrates such as a natural Or synthetic rubber. The method may comprise applying a compound comprising at least one alkoxy silane moiety and at least one moiety selected from a nitrosoaromatic or a nitrosoaromatic precursor to one of the substrates. The nitrosoaromatic moiety may be a nitrosobenzene. The nitrosoaromatic precursor may be a nitrosobenzene precursor, such as at least one of a quinone dioxime or a quinone oxime. Novel primers and compounds suitable for use in the bonding process are also disclosed.

Abstract: An organosilane of general formula I below: (HO)2 R1Si—Z—Sm—R2 in which: R1, which are identical or different, each represent a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; R2 represents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 30 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms; and m is a number greater than or equal to 2.

Abstract: Provided herein are methods for preparing vinylidene-terminated polyolefins. Further, provided herein are novel sulfide-terminated polyolefins of the formula: wherein R1 is a polyolefin group and R2 is hydrocarbyl; and methods for producing the same.

Abstract: Disclosed are low temperature curable coating compositions, related coated substrates, methods for depositing a coating on a substrate and methods for refinishing the surface of an article, such as an automobile. The coating compositions include: (1) an aminofunctional silicon compound; (2) a polyether; and (3) a compound comprising functional groups reactive with the amino functionality of the aminofunctional silicon compound.

Abstract: The suspended solids content of a Bayer process stream is reduced by contacting the stream with silicon-containing polymers.

Abstract: The method for producing a modified conjugated diene based (co)polymer, according to the present invention comprises a step of reacting a conjugated diene based (co)polymer with a metal halide compound to obtain a modified conjugated diene based (co)polymer, the conjugated diene based (co)polymer having a weight-average molecular weight of 150,000 to 2,000,000 and being obtained by bonding, to a polymer having at least a conjugated diene unit, an alkoxysilyl group and an optionally protected primary amino group. The method can satisfactorily produce a conjugated diene based (co)polymer which has a high Mooney viscosity, excellent shape stability and good processability.

Abstract: A process for producing an adsorbent where a metal oxide is reacted with an alkoxy silane to produce an epoxy-functionalized metal oxide. This product is reacted with an amino-substituted propionic acid and a nitro-substituted fluorenone, and this product is grafted to the epoxy-functionalized metal oxide. This grafted product is the adsorbent, which may be contacted with a hydrocarbon mixture having at least one sulfur containing compound in order to remove this sulfur containing compound. Also disclosed is a process for adding polymerization groups to an adsorbent.

Abstract: A moisture curable polymer and a curable composition having superior curability are provided. A polymer having a silicon group represented by the general formula: —SiFaR1bZc (wherein, R1 represents any one of a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms, or an organosiloxy group represented by R23SiO— (R2 is each independently, a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms). Z is a hydroxyl group or a hydrolyzable group other than fluorine. a is any one of 1, 2, or 3; b is any one of 0, 1, or 2; c is any one of 0, 1, or 2; and a+b+c is 3. When b or c is 2, two R1 or two Z may be each the same or different) and a curable composition including this polymer, and a sealant and an adhesive in which the curable composition is used.

Abstract: Articles prepared with a pressure sensitive adhesive prepared by combining an acrylic polymer and a silane-functional polymer, such as glass and plastic laminates, show improved impact resistance.

Abstract: An adhesive composition includes a (meth)acrylic copolymer, the (meth)acrylic copolymer containing about 92 to about 99.7 parts by weight of a moiety derived from a (meth)acrylic acid ester monomer, and about 0.3 to about 8 parts by weight of at least one of a moiety derived from a carboxyl group-containing monomer and a moiety derived from a hydroxyl group-containing (meth)acrylic acid monomer, the (meth)acrylic copolymer having a weight average molecular weight of about 500,000 g/mol to about 2,000,000 g/mol, a carbodiimide curing agent, and an oligomeric silane coupling agent.

Abstract: The present invention provides a pressure-sensitive adhesive composition comprising an acrylic polymer (a), an acrylic oligomer (b), a silane coupling agent having an amino group, and a cross-linking agent, the acrylic polymer (a) containing, as a main monomer component, at least one of a (meth)acrylic acid alkyl ester containing an alkyl group having a number of carbons of from 4 to 12 and a (meth)acrylic acid alkoxyalkyl ester, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic polymer (a), the acrylic polymer (a) having a weight-average molecular weight of from 400,000 to 1,500,000; and the acrylic oligomer (b) containing a (meth)acrylic acid ester as a main monomer component, and containing 1 to 10 parts by weight of a carboxyl group-containing monomer as a monomer component based on 100 parts by weight of the total monomer components constituting the acrylic oligomer (b)

Abstract: A sizing composition for reinforcement fibers that includes one or more film forming agents, a silane coupling agent package, and at least one lubricant surfactant is provided. Optional components such as rheology modifiers, fillers, biocides, and pH modifiers may also be included. Preferred film forming polymers are amide-based polymers. Additionally, the sizing composition is free of polyvinyl alcohol. The absence of polyvinyl alcohol in the size composition reduces or eliminates the production of precipitates from white water in wet-laid processes. The size composition is applied to reinforcement fibers and formed into chopped strand, wet-laid mats that can be used for a variety of purposes, including roofing products. Chopped strand mats formed from fibers sized with the inventive sizing composition maintains or improves the dry tear and tensile strengths compared to chopped strand mats made from fibers sized with a commercial sizing composition that does not contain polyvinyl alcohol.

Abstract: A method for producing a conjugated diene polymer is provided that includes a step of polymerizing a conjugated diene-containing monomer in a hydrocarbon solvent in the presence of an alkali metal catalyst, thus giving a polymer having a catalyst-derived alkali metal at one terminus of a polymer chain comprising a conjugated diene-based monomer unit, and a step of reacting the polymer obtained in the step of polymerizing and a trialkoxysilane compound represented by the formula below. (In the formula, M denotes an oxygen atom or a sulfur atom, R1, R2, and R3 independently denote an alkyl group having 1 to 4 carbon atoms, m denotes an integer of 1 to 5, and n denotes an integer of 0 to 5.

Abstract: A resin composition for laser engraving is provided that includes (Component A) a compound having a hydrolyzable silyl group and/or a silanol group, (Component B) a depolymerization catalyst and/or a depolymerization catalyst precursor, and (Component C) a depolymerizable binder polymer.

Abstract: The invention relates to a blocked mercaptosilane of general formula I below: (HO)2R1—Si—Z—S—C(?O)-A in which: R1 represents a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; A represents hydrogen or a monovalent hydrocarbon-based group chosen from alkyls, which are linear or branched, cycloalkyls or aryls, having from 1 to 18 carbon atoms; Z represents a divalent bonding group comprising from 1 to 18 carbon atoms.