Abstract: The present invention relates to a curable petroleum resin, a preparation method therefor, and use thereof, wherein the curable petroleum resin comprises a repeating unit derived from a petroleum resin monomer, a repeating unit derived from a silane monomer and a repeating unit derived from a cyclic anhydride monomer, and wherein the curable petroleum resin is used as an additive for a reactive polyolefin-based adhesive composition to increase the adhesive strength to a polyolefin-based substrate used for various parts.

Abstract: The invention relates to multilayer polymer structures having at least three layers. These layers include a polar capstock layer other than an acrylic, an olefinic substrate layer, and a tie layer. The tie layer is selected from olefinic acrylate copolymers, a block copolymer of vinyl aromatic monomer with an aliphatic conjugated diene or a derivative thereof, a copolymer of olefin and (meth)acrylic acid partially or fully in the salt form, a high impact polystyrene, and/or a vinyl cyanide-containing compound. Each layer could contain multiple sub-layers. The multilayer structure exhibits excellent structural integrity, excellent surface appearance, high impact strength, high scratch resistance, and excellent resistance to UV rays.

Abstract: The present invention relates to a liquid composition comprising a monomer, a (meth)acrylic polymer and at least two initiators. In particular the present invention relates to a liquid composition comprising a monomer, a (meth)acrylic polymer and at least two initiators that have a different half life time. That liquid composition can be used as a syrup and especially as a syrup for impregnation of fibres or fibrous material. Also concerned is a thermoplastic material obtained after polymerization of the liquid composition. The invention also relates to a process for manufacturing such a liquid composition. The invention also relates to a process for impregnating a fibrous substrate of long fibres with said liquid composition. The invention also relates to a fibrous substrate impregnated with said liquid composition which is useful for manufacturing composite parts.

Abstract: An object of the present invention is to provide a multi-component polar olefin copolymer which has sufficiently improved solvent solubility without impairing mechanical properties and the like. The present invention relates to a multi-component polar olefin copolymer containing: one kind of unit of nonpolar monomer (X1) that is ethylene or an ?-olefin having 3 to 10 carbon atoms; one or two or more kinds of units of polar monomers (formula (1), Z1); and structural unit(s) of one or two or more kinds of units of nonpolar monomers (X2) that are different from the above X1 and/or one or two or more kinds of units of polar monomers (formula (2), Z2): H2C?CH—COOQT1??(1) H2C?CH-T2??(2).

Abstract: Disclosed are self-assembled propylene-based bi-layer compositions having a skin layer comprising a propylene-based elastomer-toughened composition and a core layer comprising a propylene-based fiber-reinforced composition, wherein the propylene-based elastomer-toughened composition and propylene-based fiber-reinforced composition self-assemble upon mixing into the skin layer and the core layer. Processes for producing these self-assembled propylene-based compositions are also disclosed.

Abstract: Provided are new partially hydrogenated nitrile rubbers which are distinguished by a specific ratio of viscosity to molecular weight, and also vulcanizable mixtures and vulcanizates based on said rubbers, and also the associated preparation processes. The partially hydrogenated nitrile rubbers lead to compounded formulations having advantageous processing properties in conjunction with excellent vulcanizate properties.

Abstract: The present invention generally relates to alcohol-terminated polyisobutylene (PIB) compounds, and to a process for making such compounds. In one embodiment, the present invention relates to primary alcohol-terminated polyisobutylene compounds, and to a process for making such compounds. In still another embodiment, the present invention relates to polyisobutylene compounds that can be used to synthesize polyurethanes, to polyurethane compounds made via the use of such polyisobutylene compounds, and to processes for making such compounds. In yet another embodiment, the present invention relates to primary alcohol-terminated polyisobutylene compounds having two or more primary alcohol termini and to a process for making such compounds. In yet another embodiment, the present invention relates to primary terminated polyisobutylene compounds having two or more primary termini selected from amine groups or methacrylate groups.

Abstract: To provide a composition for a wire coating member containing a non-crosslinked material at a low cost, which has superior flame retardancy, and is excellent in heat resistance, wear resistance and flexibility, and to provide an insulated wire and a wiring harness containing the composition. The composition contains (A) polypropylene, (B) a polyolefin elastomer, (C) a bromine flame retardant, (D) an antimony trioxide, (E) magnesium hydroxide, either one of (F) (F1) a zinc sulfide and (F2) a zinc oxide and (F3) mercaptobenzimidazole, and (G) a hindered phenolic antioxidant. The insulated wire includes a conductor and an insulation coat made from the composition, wherein the insulation coat has a thickness of 0.5 mm or less, and the insulated wire has an external diameter of 4 mm or less. The wiring harness includes the insulated wire.

Abstract: A low-gloss thermoplastic resin composition that can have excellent heat resistance and weather resistance of the present invention includes (A) a thermoplastic resin forming a first dispersed phase; and (B) an acrylic resin forming a second dispersed phase, wherein the first dispersed phase has a network configuration.

Abstract: Polymer polyols having a solids content of greater than 40 wt. %, a total ethylene oxide content of up to 25 wt. %, and a viscosity at 25° C. of less than 15,000 centistokes are produced by reacting (1) a base polyol having active hydrogen atoms with an ethylene oxide content of from 15 to 40 wt. % that has been formed in the presence of a double metal cyanide (DMC) catalyst, (2) one or more unsaturated monomers, (3) at least one radical initiator, optionally (4) a preformed stabilizer and optionally (5) a chain transfer agent. These polymer polyols (PMPOs) are useful in the preparation of polyurethane foams and elastomers.

Abstract: Provided are crosslinkable propylene-based copolymers, methods for making the same, elastomeric compositions including the same, and articles made therefrom, e.g., films and fibers. Exemplary elastomeric compositions are composed of at least one propylene-based polymer comprising propylene derived units and one or more dienes, the propylene-based polymer having a triad tacticity of from 50% to 99% and a heat of fusion of less than 80 J/g; about 0.5 wt % to about 10 wt % vinyl siloxane; and about 0.1 wt % to about 1.0 wt % peroxide. The elastomeric compositions can be extruded and crosslinked at a temperature of at least about 50° C. and a relative humidity of at least about 90% to provide a crosslinked elastomeric composition. The crosslinked elastomeric compositions are particularly useful for making fibers and films.

Abstract: The present invention relates to curable compositions which are capable of safely and sufficiently bonding components of electrical devices. In particular, the invention relates to two-part, halogen-free curable compositions which are capable of rapidly curing at room temperatures as well as at elevated temperatures.

Abstract: Material composed of a polyazacycloalkane grafted on polypropylene fibres. Process for the preparation of this material. Process for removing metal cations present in a liquid by bringing this liquid into contact with the said material.

Abstract: A chemical two-component mortar compound including a resin component (A) that contains at least one radically curable, ethylenically unsaturated compound (a) as the curable component, and including a separately arranged so as to inhibit reaction curing component (B) that contains a curing agent for the resin of the resin component (A), with improved adhesion to the surface of partially cleaned and/or moist holes in mineral substrates, characterized by a content of 0.

Abstract: An acrylate-based curable printing medium is disclosed. Acrylates, in the form of monomers, dimers, trimers and oligomers, as well as resins, form an interpenetrating polymer network by crosslinking, which is effected by heat, and optionally peroxide curing agents. Formulations can be tailored to achieve desired properties of the cured polymer including film hardness, burnout properties, and adhesion to glass. Such properties are adjusted by manipulating the relative proportions of the acrylic monomers, oligomers and resins that are used as a ceramic medium or vehicle.

Abstract: A novel vulcanizable composition is provided, based on at least one hydrogenated nitrile rubber, on at least one peroxide, on at least one unsaturated carboxylic acid and/or salts thereof, and also on specific microgels. These vulcanizable compositions can be used to obtain vulcanized products which can in particular be used for drive belts, roll coverings, hoses and cables.

Abstract: Disclosed is a method for producing a modified propylene polymer that exhibits low flowability and also exhibits little fluctuation in melt flow rate compared with the melt flow rate of the propylene polymer before modification, the method involving a heat treatment step of subjecting a mixture comprising 100 parts by weight of a propylene polymer (A), from 0.1 to 50 parts by weight of an ethylenically unsaturated bond-containing compound (B), and from 0.01 to 20 parts by weight of an organic peroxide (C) whose decomposition temperature at which the half-life thereof becomes 1 minute is lower than 120° C. to heat treatment by using an extruder at a temperature lower than the decomposition temperature of the organic peroxide (C) at which the half-life thereof becomes 1 minute.

Abstract: The present invention relates to unsaturated polyester resin compositions comprising (a) an unsaturated polyester, (b) a vinyl group containing organic compound as reactive diluent and (c) a tertiary aromatic amine, wherein the resin composition further comprises (d) a compound according to formula (1) as reactive diluent whereby n=0-3; R1 and R2 each individually represent H, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl; X=O, S or NR3 whereby R3=H, C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl, C7-C20 arylalkyl, part of a polymer chain or attached to a polymer chain, and the resin composition comprises, as vinyl group containing organic compound (b), styrene, a styrene derivative, a vinyl ether, a vinyl amine or vinyl amide or a mixture of at least two of these compounds.

Abstract: A modified polypropylene-based polymer obtained by graft modification of a propylene/?-olefin copolymer with a xylene-soluble portion of at least 40 mass % and no greater than 85 mass %, a xylene-soluble portion (XS) intrinsic viscosity (XSIV) of at least 2.5 dl/g, and an MFR value of no greater than 3.0 g/10 min at 230° C. under a load of 2.16 kg, using an unsaturated carboxylic acid or its derivative, and a flame retardant polyolefin-based resin composition having prescribed contents of a polyolefin-based resin component comprising 60-95 mass % of a polyolefin-based resin and 40-5 mass % of a modified polypropylene-based polymer, and an inorganic flame retardant component comprising an inorganic filler.

Abstract: The present invention provides a modified natural rubber that offers higher efficiency of graft polymerization or attachment of a polar group-containing compounds, and that possesses excellent low loss factor, wear resistance and fracture resistance when used as a rubber composition, a rubber composition using the modified natural rubber and a tire using the rubber composition. In the present invention, a polar group-containing compound is graft polymerized or attached under mechanical shear force to a natural rubber raw material having a nitrogen content of 0.4 mass % or less.

Abstract: The disclosed is a comb-shaped graft copolymer, including a back bone of PMMA and side chains of a random copolymer, a block copolymer, or a homopolymer polymerized of a monomer having a carbon-carbon double bond. The monomer can be alkyl acrylate, styrene, and the likes. The side chains terminal is grafted to a nitro-oxy compound.

Abstract: The present invention provides a weather resistant thermoplastic resin with low gloss and a method of preparing the same. The thermoplastic resin of the present invention comprises a (meth)acrylic acid alkyl ester-based polymer (A) and a (meth)acrylic acid alkyl ester-based oligomeric prepolymer (B), and an aromatic vinyl-cyanide vinyl based copolymer (C), wherein the (meth)acrylic acid alkyl ester-based polymer (A) and the (meth)acrylic acid alkyl ester-based oligomeric prepolymer (B) form a network-shaped disperse phase and the aromatic vinyl-cyanide vinyl based copolymer (C) forms a continuous phase.

Abstract: A polypropylene resin having: (1) a melt flow rate (MFR) of 6 to 100 g/10 minutes, (2) a molecular weight distribution (Mw/Mn), measured by gel permeation chromatography, of 3 to 6, and (3) a 116° C. non-eluted component content (100-W116(%)) of 50% or more and a content of components eluted at 90° C. or less (W90) of 10 to 30%, measured by temperature-rising fractional chromatography (TREF).

Abstract: An aqueous dispersion containing a graft copolymer satisfying (a) to (e) and water: (a) a graft rate is 1 to 150% by mass, (b) a weight average molecular weight is 500 to 400000, (c) a molecular weight distribution is 1.5 to 4, (d) a main chain containing a monomer unit having a hydrophilic group and (e) an ?-olefin homopolymerization or ?-olefin/ethylene copolymerization side chain, wherein a mesopentad ratio [mmmm] of the polymerization chain is 30 to 80 mole %.

Abstract: A graft copolymer satisfying (a) to (e): (a) a main chain derived from one or more monomers selected from (I) an acrylic acid, (II) a methacrylic acid, (III) a vinyl ester, (IV) a styrene and (V) a vinyl group-containing silane compound, at least one kind of the monomer having a crosslinkable functional group, (b) a side chain derived from a reactive homopolymer ?-olefin having a meso pentad fraction (mmmm) of from 30 to 80% by mol or a copolymer of 50% by mass or more of at least one ?-olefin, (c) a graft ratio of from 1 to 150% by mass, (d) a weight average molecular weight of from 500 to 400,000, and (e) a molecular weight distribution (Mw/Mn) of from 1.5 to 4.

Abstract: The present invention provides a thermoplastic resin composition which comprises (A) a (meth)acrylic acid alkyl ester-based polymer forming a network-shaped disperse phase; and (B) an aromatic vinyl-cyanide vinyl based copolymer forming a continuous phase. The thermoplastic resin composition of the present invention can have an excellent low gloss characteristics while maintaining basic physical properties of a weather resistance, impact strength, thermal resistance, and delamination characteristics.

Abstract: The invention relates to a process for grafting hydrolysable silane groups to a polyolefin, comprising reacting the polyolefin with an unsaturated silane, containing an olefinic —C?C— bond or acetylenic —C?C— bond and having at least one hydrolysable group bonded to Si, or a hydrolysate thereof, in the presence of means capable of generating free radical sites in the polymer. The silane contains an aromatic ring or a further olefinic double bond or acetylenic unsaturation, the aromatic ring or the further olefinic double bond or acetylenic unsaturation being conjugated with the olefinic —C?C— or acetylenic —C?C— unsaturation of the silane. The unsaturated silane may also contains electron-withdrawing moiety with respect to the olefinic —C?C— or acetylenic —C?C— bond. The invention permits to provide a silane-modified polyolefin having a high grafting efficiency while limiting/preventing polymer degradation by chain scission.

Abstract: The present invention relates to modified polyolefins having a propylene content of at least 50 ma-% and a maximum of 75 ma-%, being determined by means of 13C-NMR spectroscopy, and having a poly(ethylene) triad content of a maximum of 2.5 ma-%, being determined by means of 13C-NMR spectroscopy, relative to the total detected ethylene content, a melting heat of at least 9 and a maximum of 20 J/g, determined by means of differential calorimetry, and a solubility in xylol at ambient temperature of at least 96 ma-%, and a solubility in THF at ambient temperature of at least 67 ma-%, wherein one or multiple silanes are grafted onto the polymer. The invention further relates to a method for the production of the polyolefins, and to the use thereof, particularly in or as an adhesive.

Abstract: The present invention relates to a novel multi functional additive grafted rubber. More particularly the present invention relates to novel grades of rubber and in particular to chemically grafted with cardanol (meta-penta decenyl phenol) and/or its derivatives. Importantly the rubber grades of the invention involve chemically anchored/grafted selective meta alkenyl phenol and/or its derivatives in the backbone of natural or synthetic rubber. Importantly, such rubber variant of the invention have high plasticity, lower Mooney and melt viscosities, better cure properties as compared to conventional virgin natural rubber or natural rubber plasticized with aromatic process oils.

Abstract: The present invention relates to novel polymer polyols which have low viscosities and high hydroxyl numbers, and to a process for the preparation of these novel polymer polyols. These polymer polyols have hydroxyl numbers of ?20, solids contents of about 30 to about 65% by weight and a viscosity that is less than or equal to: be[2.7c]. These comprise the reaction product of a base polyol, a preformed stabilizer and at least one ethylenically unsaturated monomer, in the presence of a free-radical polymerization initiator and at least one polymer control agent. The base polyol has a hydroxyl number of 60 to 1900, a functionality of 1 to 10, and an equivalent weight of 30 to 900.

Abstract: There is disclosed a process for preparing organic nano-particles comprising the steps of: (a) preparing a solution comprising an unsaturated polyester and/or a vinyl ester resin and a hydrophobic monomer; (b) dispersing the solution obtained in step (a) in an aqueous phase to form a stable emulsion where the aqueous phase is the continuous phase; and (c) using an initiator to cure the emulsion obtained in step (b) in the presence of a water soluble inhibitor to form a dispersion of nano-particles. The invention further provides organic nano-particles obtainable by the process according to the invention; various uses of said nano-particles; such as in paper, dye, toner and personal care compositions and topical medicaments comprising said nano-particles.

Abstract: Disclosed herein is a non-glossy rubber modified aromatic vinyl-vinyl cyanide copolymer and a method for continuously preparing the same. The copolymer comprises about 80 to about 93% by weight of an aromatic vinyl-vinyl cyanide copolymer grafted onto about 7 to about 20% by weight of a diene-based rubber, and a dispersed phase of the copolymer has an average rubber particle diameter of about 6 to about 20 ?m and a span of about 1.2 to about 2.8.

Abstract: Provided is a multi-arm (greater than 3 arms) star ethylene polymer (sEP). The multi-arm star ethylene polymer is a polymer of an ethylene/maleic anhydride copolymer (EMAC) grafted with vinyl-terminated polyethylene. There are also provided a process for making the sEP and blend of a matrix ethylene polymer and the sEP.

Abstract: The present invention relates to a method for radically curing an unsaturated polyester resin or vinyl ester resin composition, wherein the resin composition contains at least 10 ppm radical inhibitor; the resin composition has an acid value of from 0.001 to 300 mg KOH/g resin composition and the curing is effected in the presence of at least 5 mmol Mn/kg primary resin system and at least 10 mmol of thiol/kg primary resin system. The invention also relates to cured objects or structural parts obtained from a resin composition obtained by such a process.

Abstract: An insulation material for electric cables includes an ethylene-alpha olefin copolymer with a melting point of 30° C. to 90° C.; and 0.5 to 20 parts by weight of a crosslinking agent based on 100 parts by weight of the ethylene-alpha olefin copolymer. The insulation material composition is based on a non-crystalline ethylene copolymer, and thus is flexible and satisfies tensile strength and insulation characteristics in conformity with the industrial standards. The insulation material composition is suitable for an insulation of electric cables for power, control and signaling that are installed in narrow spaces, in particular, electric cables for ships.

Abstract: A cross-linking system which includes at least; one organic peroxide having a half-life of one hour at any temperature selected in the range from 80 DEG C. to 115 DEG C., and a cross-linking coagent, the half-life of said peroxide being measured by dissolving the peroxide in n-dodecane having a concentration of 0.2 mol/l. Said system enables, when added to a polymer, quick cross-linking of said polymer. The system is in particular suitable for encapsulating photovoltaic modules; in particular, the system can be used to improve the productivity of the method for manufacturing said modules.

Abstract: The instant invention is a crosslinkable polyethylene composition obtained via a process comprising the steps of (1) providing a polyethylene component; (2) providing an organic peroxide crosslinking agent,(3) providing a crosslinking coagent which comprises at least two terminal carbon-carbon double bonds and is an alkadiene, alkatriene, or alkatetraene compound; (4) melt blending the polyethylene component, the crosslinking agent, and the crosslinking coagent at a temperature less than the decomposition temperature of the crosslinking agent; and (5) thereby forming the crosslinkable polyethylene composition. The crosslinkable polyethylene composition may further include a scorch inhibitor, a cure booster, a stable free radical, one or more conventional additives, and/or combinations thereof. The instant invention further includes articles comprising the crosslinked product of the crosslinkable polyethylene composition.

Abstract: Disclosed is a method for producing a modified propylene polymer that exhibits low flowability and also exhibits little fluctuation in melt flow rate compared with the melt flow rate of the propylene polymer before modification, the method involving a heat treatment step of subjecting a mixture comprising 100 parts by weight of a propylene polymer (A), from 0.1 to 50 parts by weight of an ethylenically unsaturated bond-containing compound (B), and from 0.01 to 20 parts by weight of an organic peroxide (C) whose decomposition temperature at which the half-life thereof becomes 1 minute is lower than 120° C. to heat treatment by using an extruder at a temperature lower than the decomposition temperature of the organic peroxide (C) at which the half-life thereof becomes 1 minute.

Abstract: Disclosed is a modified propylene polymer excellent in the balance between melt tension and flowability, the modified propylene polymer being obtainable by reacting 100 parts by weight of a propylene polymers (A), from 0.1 to 50 parts by weight of an ethylenically unsaturated bond-containing compounds (B), and from 0.01 to 20 parts by weight of an organic peroxide (C), wherein a melt flow rate measured at 230° C. under a load of 2.16 kg and a melt tension measured at 190° C. satisfy the following formula (1): MT>9×MFR(?0.9)??(1).

Abstract: A golf ball including a thermoplastic core having an outer diameter of 1.51 inches to 1.59 inches; an outer cover layer; and an inner cover layer between the core and the outer cover layer. The thermoplastic core has been exposed to a gradient-initiating solution comprising a solvent, free radical initiator, and a reactive co-agent comprising a metal salt of an acrylic or methacrylic acid, a mono- or multi-functional acrylate or methacrylate, or having the chemical structure where R=linear, branched, or aromatic C1-C14 and n=1-5, such that the hardness of the outer surface is different than the hardness of the geometric center to define a positive or negative hardness gradient of 5 Shore C or greater.

Abstract: The invention provides a golf ball having a core formed by vulcanizing a rubber composition and a cover composed primarily of a polyurethane material. The rubber composition of the core includes 100 parts by weight of a base rubber, from 10 to 40 parts by weight of an unsaturated carboxylic acid or a metal salt thereof, a peroxyketal (a) and a monophenol-type antioxidant (b), the weight ratio (a)/(b) of the peroxyketal to the monophenol-type antioxidant being from 5 to 50. The ball has an excellent discoloration resistance and an outstanding distance and feel on shots taken with a middle iron.

Abstract: A combination of vinyl trimethoxysilane and vinyl triethoxysilane can be grafted onto polyethylene to produce a polyethylene graft terpolymer that can be crosslinked without a significant reduction in crosslinking rates relative to vinyl triemethoxysilane grafted polyethylene. The combination of vinyl trimethoxysilane and vinyl triethoxysilane apparently act synergistically. While byproduct methanol from crosslinking with trimethoxysilane is very undesirable in some products, byproduct ethanol from crosslinking is less hazardous, especially at ppm levels.

Abstract: A process for constructing multi-arm star macromolecules with uniform properties, high molecular weight and narrow molecular weight distribution using free radical polymerization is described.

Abstract: This invention relates to the modification of elastomers by reaction with unsaturated silanes, to the modified elastomers produced and to articles produced by shaping and curing modified elastomer compositions. It also relates to the use of unsaturated silanes as coupling agents in filled elastomer compositions. In a process according to the present invention, the silane has the formula: R?—CH?CH—C(O)X—Y—SiRaR?(3-a) (I) or R?—C?C—C(O)X—Y—SiRaR?(3-a) (II) in which R represents a hydrolysable group; R? represents a hydrocarbyl group having 1 to 6 carbon atoms; a has a value in the range 1 to 3 inclusive; Y represents a divalent organic spacer linkage comprising at least one carbon atom separating the linkage —C(O)X— from the Si atom, X is selected from S or O; and R? represents hydrogen or a group having an electron withdrawing effect with respect to the —CH?CH— or —C?C— bond. This provides silanes able to react efficiently with a diene elastomer in the presence of a free radical initiator.

Abstract: Preformed compositions in shaped form comprising polymer blends, and the use of these preformed compositions in shaped form to seal apertures are disclosed. In certain embodiments, the preformed compositions are electrically conductive and are capable of shielding EMI/RFI radiation. The polymer blend includes a polysulfide component and a polythioether component.

Abstract: Disclosed are high impact polystyrenes prepared using mixed initiators. The mixed initiators include at least one grafting initiator and one non-grafting initiator. The high impact polystyrenes prepared therewith have a continuous polystyrene phase and dispersed therein particles of rubber predominantly having a honeycomb structure of rubber with polystyrene inclusions.

Abstract: A process for the preparation of plastic molded articles which can be used in the dental field, the process including the steps of: mixing A) at least one polymerizable component and B) at least one initiator in desensitized form to form a paste having a consistency does not demix during injection; injecting the paste into a cuvette; and polymerizing the mixture by applying heat.

Abstract: A chemical two-component mortar compound including a resin component (A) that contains at least one radically curable, ethylenically unsaturated compound (a) as the curable component, and including a separately arranged so as to inhibit reaction curing component (B) that contains a curing agent for the resin of the resin component (A), with improved adhesion to the surface of partially cleaned and/or moist holes in mineral substrates, characterized by a content of 0.

Abstract: The invention relates to a process for grafting hydrolysable silane groups to a polyolefin, comprising reacting the polyolefin with an unsaturated silane, containing an olefinic —C?C— bond or acetylenic —C?C— bond and having at least one hydrolysable group bonded to Si, or a hydrolysate thereof, in the presence of means capable of generating free radical sites in the polymer. The silane contains an aromatic ring or a further olefinic double bond or acetylenic unsaturation, the aromatic ring or the further olefinic double bond or acetylenic unsaturation being conjugated with the olefinic —C?C— or acetylenic —C?C— unsaturation of the silane. The unsaturated silane may also contains electron-withdrawing moiety with respect to the olefinic —C?C— or acetylenic —C?C— bond. The invention permits to provide a silane-modified polyolefin having a high grafting efficiency while limiting/preventing polymer degradation by chain scission.

Abstract: A process for grafting hydrolysable silane groups to polyethylene includes reacting polyethylene with an unsaturated silane having at least one hydrolysable group bonded to Si, in the presence of a compound capable of generating free radical sites in the polyethylene. The grafted polyethylene prepared by the process can be shaped into a pipe and crosslinked by water flowing through the pipe.