Abstract: High molecular weight disulfide polymers are synthesized in aqueous media by exposing dithiol compounds to a mild oxidizing environment in the presence of a tertiary amine catalyst. The unique oxidizing system polymerizes monomers through the formation of sulfur-sulfur bonds between dithiol compounds. The same oxidizing system may be used to make disulfide-crosslinked gels from compounds containing multiple thiol groups. The oxidizing system is comprised of oxygen at atmospheric concentration and dilute hydrogen peroxide. A filler such as carbon black may be incorporated into the polymer or cross-linked gel during polymerization. A polydisulfide polymer is provided having a weight average molecular weight of greater than about 100,000 g/mol and a polydispersity index of about 2 or less. A tetrathiol composition results from a reaction of a diacrylate with a trithiol.

Abstract: An encapsulant composition for a light-emitting diode is provided. One embodiment of the encapsulant composition comprises: (a) about 100 parts by weight of at least one liquid bi-functional epoxy resin containing about 40˜50 weight % of aromatic ring; (b) about 55˜120 parts by weight of a curing agent comprising at least one bi-functional thiol curing agent containing aromatic ring and at least one aliphatic tetra-functional thiol curing agent, wherein the curing agent contains about 10˜50 weight % of aromatic ring and about 20˜35 weight % of sulfur; and (c) about 0.05˜0.5 parts by weight of a catalyst. The encapsulant composition having a high refractive index can be used for a solid state light emitting device to enhance light extraction efficiency.

Abstract: The instant invention is a cure system for halogenated elastomer compositions, a curable halogenated elastomer composition, and a method for curing a halogenated elastomer composition. The cure system for halogenated elastomer compositions includes a polymercapto crosslinking agent, an inorganic base, and a hydrated salt selected from the group consisting of lithium citrate, trilithium citrate pentahydrate, trilithium citrate tetrahydrate, and monolithium dihydrogen citrate monohydrate. The curable halogenated elastomer composition includes a chlorinated elastomer, and a cure system including a polymercapto crosslinking agent, an inorganic base, and a hydrated salt selected from the group consisting of lithium citrate, trilithium citrate pentahydrate, trilithium citrate tetrahydrate, and monolithium dihydrogen citrate monohydrate.

Abstract: Disclosed is a method of preparing a modified halogenated polymer surface, comprising the steps of (a) activating the surface by modification with a polymerisation initiator by (a1) reacting the halogenated polymer surface with sodium azide and subsequent (a2) 1,3 dipolar cycloaddition with an alkine-functionalized initiator; or (a3) reacting the halogenated polymer surface with mercapto-functionalized initiators; and (b) reacting the activated surface obtained in steps (a1)/(a2) or (a3) with polymerizable monomeric units A and/or B. The modified halogenated polymer substrates according to the invention exhibit outstanding properties.

Abstract: The invention relates to functionalized matrix materials or matrices that have structures of general formula (I) T-(C?O)O—B-D, methods for the production thereof, and the use thereof in methods for purifying and isolating biomolecules.

Abstract: Novel additive systems for lead-free filled cable insulation are disclosed. These systems provide improved electrical and mechanical properties. The base polymer may be metallocene based, non metallocene based or combinations thereof. The additives may contain one or more hindered amine light stabilizers, mercapto compounds, and optionally, amine antioxidants.

Abstract: The instant invention provides a two-step polymerization process for preparing amphiphilic poly(N-vinyl-2-pyrrolidone), (PVP)-block-polyester copolymers and other diblock and triblock copolymers consisting of PVP as one block. The block copolymers of the invention can be used as vehicles for drug delivery.

Abstract: A polymer compound having a structure represented by the formula (1) as defined herein at a main chain terminal, and a positive photosensitive composition containing a polymer compound having a structure represented by the following formula (1) as defined herein at a main chain terminal and a photoacid generator capable of generating an acid upon irradiation with actinic rays or radiation.

Abstract: The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent, an inorganic base, and a quaternary ammonium salt. The quaternary ammonium salt has a formula selected from the group consisting of wherein R1 is an alkyl or aryl group containing between 4 and 12 carbon atoms; wherein R2 and R3 are independently alkyl or aryl groups containing between 1 and 8 carbon atoms; wherein the total number of carbon atoms on R2 and R3 are between 3 and 9; wherein R4 and R5 are methyl groups, and R6 is an alkyl group containing between 2 and 8 carbon atoms; and wherein X is an anion.

Abstract: The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent; an inorganic base; and an onium salt. The onium salt has a formula selected from the group consisting of wherein Z is a nitrogen or phosphorous atom, R1 to R4 are independently alkyl or aryl groups containing between 2 and 8 carbon atoms, and the total number of carbon atoms on R1-R4 is between 10 and 14; wherein R5 and R6 are alkyl groups containing between 1 and 8 carbon atoms, and the total number of carbon atoms on R5-R6 being between 5 and 9; and wherein X is an anion.

Abstract: The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent; an inorganic base; and an onium salt. The onium salt has a formula selected from the group consisting of formula (I) and formula (II); wherein Z is a nitrogen or phosphorous atom, R1 to R4 are independently alkyl or aryl groups containing between 2 and 8 carbon atoms, and the total number of carbon atoms on R1-R4 is between 10 and 14; wherein R5 and R6 are alkyl groups containing between 1 and 8 carbon atoms, and the total number of carbon atoms on R5-R6 being between 5 and 9; and wherein X is an anion.

Abstract: Process for the elimination of residual mercaptans from nitrile rubbers, comprising: a. adding a colloidal emulsion of sulfur to a nitrile latex emulsion (NBR rubber latex) containing free mercaptan and with a pH of between 7 and 14, at a temperature ranging from 30 to 120° C.; b. coagulating the nitrile latex c. washing with demineralized water and drying the NBR rubber recovered after coagulation.

Abstract: A positive working resist composition comprises a specific resin. The specific resin comprises: a repeating unit having a first specific group; and a repeating unit having a second specific group, the first specific group being different from the second specific group; and a specific structure in an end terminal of the resin. The specific resin decomposes by action of an acid to increase its solubility in an alkaline developer.

Abstract: The instant invention is an improved cure system composition and a method for curing chlorinated elastomer compositions. The cure system composition includes a polymercapto crosslinking agent, an inorganic base, and a quaternary ammonium salt. The quaternary ammonium salt has a formula selected from the group consisting of wherein R1 is an alkyl or aryl group containing between 4 and 12 carbon atoms; wherein R2 and R3 are independently alkyl or aryl groups containing between 1 and 8 carbon atoms; wherein the total number of carbon atoms on R2 and R3 are between 3 and 9; wherein R4 and R5 are methyl groups, and R6 is an alkyl group containing between 2 and 8 carbon atoms; and wherein X is an anion.

Abstract: This invention provides a modified natural rubber latex formed by charging a polar group-containing mercapto compound into a natural rubber latex to add the polar group-containing mercapto compound to a natural rubber molecule in the natural rubber latex, a modified natural rubber formed by coagulating and drying the modified natural rubber latex, and the rubber composition using the modified natural rubber and being excellent in the low loss factor, wear resistance and fracture characteristics.

Abstract: According to an aspect of the present invention, implantable or insertable medical devices are provided that contain at least one covalently crosslinked polymeric region, which contains at least one block copolymer comprising at least one low Tg block and at least one high Tg block.

Abstract: The disclosure herein relates to organofunctional silanes and mixtures of organofunctional silanes possessing mercaptan and hydrocarbyl and/or heterocarbyl functionality. These silanes reduce or eliminate the generation of volatile organic compounds (VOC's) during use, aid in the processing of filled elastomeric materials and enhance the end-use properties of the filled elastomer. The present disclosure relates to a rubber composition and article comprising these silanes.

Abstract: A method is provided for modifying a poly(arylene vinylene) or poly(heteroarylene vinylene) precursor polymer having dithiocarbamate moieties by reacting it with an acid and further optionally reacting the acid-modified polymer with a nucleophilic agent. Also provided are novel polymers and copolymers bearing nucleophilic side groups which are useful as components of electronic devices, e.g. in the form of thin layers.

Abstract: The present invention relates to a continuous process for producing polymers at conversions ranging from 50% to 95% having a Mooney viscosity of at least 25 Mooney-units and a gel content of less than 15 wt. % containing repeating units derived from at least one isoolefin monomer, more than 4.1 mol % of repeating units derived from at least one multiolefin monomer and optionally further copolymerizable monomers in the presence of AlCl3 and a suitable proton source (e.g. water) or cationogen and at least one multiolefin cross-linking agent wherein the process is conducted in the absence of transition metal compounds and organic nitro compounds.

Abstract: Disclosed is a silver halide photographic light-sensitive material, which has at least one polymer compound having a nitrogen-containing aromatic ring having a mercapto group represented by the formula Z-SH wherein Z represents a nitrogen-containing aromatic ring as a partial structure. This silver halide photographic light-sensitive material can stably contain silver halide grains of a high aspect ratio showing high sensitivity and superior planarity, shows superior pressure resistance and can be stably prepared.

Abstract: The instant invention provides a two-step polymerization process for preparing amphiphilic poly(N-vinyl-2-pyrrolidone), (PVP)-block-polyester copolymers and other diblock and triblock copolymers consisting of PVP as one block. The block copolymers of the invention can be used as vehicles for drug delivery.

Abstract: Polymers grafted with a compound of formula I, formula (I) wherein the general symbols are as defined in claim 1, have outstanding stability against oxidative, thermal, dynamic, light-induced and/or ozone-induced degradation [R1—SOmnR—SOp—R2.

Abstract: Disclosed herein is a process of manufacturing a filled rubber comprising the steps of: mixing a rubber, an inorganic filler, and a blocked mercaptosilane of a structure defined herein, to produce a rubber mixture; mixing into the rubber mixture; (i) a deblocking agent to deblock the blocked mercaptosilane, and (ii) a curing agent; and allowing the rubber mixture to cure.

Abstract: The invention relates to a coating composition comprising an acetal-functional binder and a thiol-functional cross-linker, wherein the acetal-functional binder is represented by the following formula wherein P is a binder backbone, K is a divalent and/or trivalent organic moiety having 1 to 30 carbon atoms and having one or two links to the binder backbone, A is selected from oxygen, sulphur, and NRVII, wherein RVII is hydrogen or an alkyl group with 1 to 4 carbon atoms, m is an integer from 1 to 50, n is an integer from 1 to 10, and R and R? may be the same or different and represent alkyl groups with 1 to 4 carbon atoms. In a further aspect, the invention relates to acetal-functional binders, acetal-functional monomers, a process for the preparation of said monomers, coating compositions comprising said acetal-functional binders, and to a process for the preparation of a coating composition comprising an acetal-functional polyurethane dispersion and a thiol-functional cross-linker.

Abstract: A blocked mercaptosilane of the structure: G-C(═O)—S—CH2CH2CH2SiX3 is disclosed wherein each X is an independently selected RO— group or R— group wherein each R is independently selected from the group consisting of hydrogen, alkyl that may or may not contain unsaturation, alkenyl groups, aryl groups, and aralkyl groups, such moieties other than hydrogen having from 1 to 18 carbon atoms, at least one X is RO—, and G is a monovalent alkyl group.

Abstract: A controlled free-radical polymerization process for forming end-functionalized polymers is disclosed, particularly by degenerative iodine transfer. The end-functionalized polymers are characterized by a polydispersity less than 2.5 and a predetermined molecular weight. The end-functionalized polymers are useful as reactive intermediates in condensation polymerization, chain polymerization and heterogeneous polymerization reactions.

Abstract: Disclosed herein is a rubber composition comprising: a) a blocked mercaptosilane of a defined structure, wherein the blocking group contains an unsaturated heteroatom or carbon chemically bound directly to sulfur via a single bond and, optionally, may be substituted with one or more carboxylate ester or carboxylic acid functional groups; b) an organic polymer; c) a filler; and d) a deblocking agent.

Abstract: Disclosed herein is a rubber composition comprising:

Abstract: Disclosed is a two-step method of making soft, high refractive index, acrylic ophthalmic device materials. In the first step, a copolymer containing pendant oxirane groups is formed by copolymerizing one or more aryl acrylic hydrophobic monomers with one or more compounds of the formula wherein X is H or CH3; and n is 1-4. In the second step, the copolymer containing pendant oxirane groups formed in the first step is reacted with a compound of the formula W—T—H wherein W is H, CH3(CH2)a, or Z(OCH2CH2)b; a is 0-3; b is 1-5; Z is H, or CH3(CH2)p; p is 0-3; and T is O, NH, S; provided that if T≠O, then W≠H.

Abstract: A polymer dispersant for pigments based on an acrylic graft copolymer wherein the graft copolymer has a weight average molecular weight of 3,000-100,000 and comprises a polymeric backbone and macromonomer side chains attached to the backbone, wherein (1) the polymeric backbone is formed of polymerized ethylenically unsaturated monomers and (2) the side chains are macromonomers that are attached to the backbone at a single terminal point and are formed from polymerized ethylenically unsaturated monomers and have a weight average molecular weight of about 1,000-30,000 wherein the graft copolymer contains about 2 to 70% by weight, based on the weight of the graft copolymer, of polymerized ethylenically unsaturated monomers containing acetoacetate groups that are polymerized into the backbone, side chains, or both, and the acetoacetate groups are reacted with a primary amine to form a pendant acetoacetyl amine group on the graft copolymer which serves as the pigment anchoring group.

Abstract: A method is provided for the rapid formation of a biocompatible gel, and may be carried out in situ, i.e., at a selected site within a patient's body. The method involves admixing a biocompatible crosslinking component A having m sulfhydryl groups wherein m≧2 and a biocompatible crosslinking component B having n sulfhydryl-reactive groups wherein n≧2 and m+n>4, wherein the sulfhydryl-reactive groups are capable of covalent reaction with the sulfhydryl groups upon admixture of the components under effective crosslinking conditions to form a gel in less than one minute. Suitable reaction conditions for carrying out the crosslinking reaction will depend on the particular components and the type of reaction involved; that is, the “effective crosslinking conditions” may involve reaction in bulk or in a solvent, addition of a base, and/or irradiation of the admixture in the presence of a free radical initiator.

Abstract: Coating composition and its use in a one-pot system. The coating composition comprises: an oxidatively drying polyunsaturated condensation product, such as an alkyd, having pendant groups in an amount of more than 20% by weight of the condensation product, the pendant groups comprising unsaturated CC bonds; a polythiol having two or more SH-groups; a siccative. The equivalence ratio of thiol functional groups to unsaturated CC bonds being less than 0.3, preferably between 0.01 and 0.25. The coating composition comprises 1-30 wt-%, preferably 3-20 wt-%, of thiol compounds, related to the total weight of solid resin. The coating composition further comprises a drying accelerating complexing agent, preferably 2,2′-bipyridyl or 1,10-phenantroline.

Abstract: A low-swelling, highly crosslinked, macroporous polystyrene resin containing functional groups which are capable of selectively binding to reaction impurities, such as excess reactant or reaction by-products, which are contained in a reaction medium. The reaction impurities can thereby be efficiently removed from the reaction medium, providing a convenient method for product purification.

Abstract: An improved process is provided for the bromination of isoolefin-conjugated diolefin polymers by brominating said polymer in solution in selected halogen-containing hydrocarbons as solvent. There is also provided an improved product of said process wherein the brominated polymer contains not less than 80 percent of the bound bromine atoms in a form suitable to participate in the vulcanization of the polymer and wherein not less than 70 percent of the bound conjugated diolefin units are similarly so brominated.

Abstract: This invention describes novel blocked mercaptosilanes wherein the hydrogen atom of the mercaptan functionality has been substituted. The invention includes methods of preparation for the blocked mercaptosilicon compounds as well as their use in filled rubbers. The blocked mercaptosilanes described are unique in that they allow the mixing of fillers with organic polymers to proceed while remaining inert toward coupling to the polymer. The coupling reactions of these blocked mercaptosilicon compounds are triggered by addition of an appropriate deblocking agent.

Abstract: The present invention relates to rubbers based on diolefins that are characterized in that they have a content of 0.1 to 40 wt. %, relative to the total quantity of rubber, of non-polar lateral, saturated, linear, branched or cyclic hydrocarbons bound via sulfur atoms containing 1 to 22 carbon atoms or aromatic hydrocarbon radicals containing 6 to 22 carbon atoms, wherein the rubbers are produced by polymerization in solution.

Abstract: The invention relates to rubber mixtures of at least one rubber containing double bonds, at least one rubber gel and at least one masked bismercaptan, and to vulcanization products and rubber shaped articles produced therefrom. The vulcanization products produced from the rubber mixtures according to the present invention show an improvement in the modulus level, a reduction in the DIN abrasion and a reduction in the heat build-up under dynamic stress.

Abstract: Disclosed are thermosetting compositions which are comprised of a resinous phase dispersed in an aqueous medium, the resinous phase comprising (a) an ungelled active hydrogen group-containing polymer which contains onium salt groups, the polymer having been prepared by atom transfer radical polymerization in the presence of an initiator having at least one radically transferable group, and (b) a curing agent having at least two functional groups which are reactive with the active hydrogen groups of (a). The active hydrogen group-containing polymers of the thermosetting compositions, which are prepared by atom transfer radical polymerization, have narrow molecular weight distributions and well-defined, specifically tailored polymer architecture which can provide enhanced crosslink density and dispersibility of the thermosetting compositions. Also disclosed is a method of electrocoating a conductive substrate using the thermosetting compositions of the invention, and a substrate coated by this method.

Abstract: Disclosed is a two-step method of making soft, high refractive index, acrylic ophthalmic device materials.

Abstract: The heat-resistant rubber composition of the invention is a vulcanizable composition comprising 100 parts by weight of a specific ethylene-&agr;-olefin-nonconjugated polyene copolymer rubber (A) composed of ethylene, an &agr;-olefin or 3 to 20 carbon atoms and a nonconjugated polyene which is a vinyl end group-containing norbornene compound, 0.2 to 5 parts by weight of an amine type anti-aging agent (C) and/or a hindered phenol type anti-aging agent (D), 1 to 10 parts by weight of a sulfur type anti-aging agent (E) and an organic peroxide (B). This heat-resistant rubber composition can provide a vulcanized rubber molded product showing not only excellent mechanical properties and electrical properties and but also prominently high thermal aging resistance.

Abstract: The present invention relates to compounds of the formula where R1, R2 and R3 are independently selected from alkoxy radicals having from 1 to 8 carbon atoms; R4 and R5 are independently selected from the group consisting of alkylene having 1 to 12 carbons, arylenes having 6 carbon atoms and alkarylenes having 7 to 10 carbon atoms and n is an integer of from 1 to 10. These compounds may be used in rubber compositions.

Abstract: Disclosed are thermosetting compositions which are comprised of a resinous phase dispersed in an aqueous medium, the resinous phase comprising (a) an ungelled active hydrogen group-containing polymer which contains onium salt groups, the polymer having been prepared by atom transfer radical polymerization in the presence of an initiator having at least one radically transferable group, and (b) a curing agent having at least two functional groups which are reactive with the active hydrogen groups of (a). The active hydrogen group-containing polymers of the thermosetting compositions, which are prepared by atom transfer radical polymerization, have narrow molecular weight distributions and well-defined, specifically tailored polymer architecture which can provide enhanced crosslink density and dispersibility of the thermosetting compositions Also disclosed is a method of electrocoating a conductive substrate using the thermosetting compositions of the invention, and a substrate coated by this method.

Abstract: The invention relates to rubber blends containing said at least one solution-polymerized rubber containing hydroxyl groups, synthesized from diolefins and vinylaromatic monomers, wherein said at least one solution-polymerized rubber containing hydroxyl groups contain in the region of 0.1 to 5 wt. % of bonded hydroxyl groups, to a process for their preparation and to their use for the production of all kinds of moldings.

Abstract: Coating composition and its use in a one-pot system.

Abstract: The invention relates to rubber blends containing said at least one solution-polymerized rubber containing hydroxyl groups, synthesized from diolefins and vinylaromatic monomers, wherein said at least one solution-polymerized rubber containing hydroxyl groups contain in the region of 0.1 to 5wt.% of bonded hydroxyl groups, to a process for their preparation and to their use for the production of all kinds of moldings.

Abstract: A novel process has been developed for the treatment of crosslinked ethylene-propylene diene monomer (EPDM) elastomer material to decrease its residual peroxide levels. EPDM is used to form the seats and neck gaskets of metering valves used in metered-dose inhalers (MDI). For filled and inverted MDI units these EPDM components are in direct contact with the pharmaceutical formulation media. The process involves exposing the EPDM valve components to a solution of 2-mercaptoethanol, a chemical reducing agent. The 2-mercaptoethanol greatly diminishes the residual peroxide levels in EPDM by reducing the peroxide functional groups to the corresponding hydroxyl groups. EPDM components treated in this manner have demonstrated very low peroxide levels and, consequently, greatly improved compatibility with the pharmaceutical formulation in the inhaler. An advantage of this approach is that the treated EPDM would likely retain its favorable physical properties and its good performance in metering valves.

Abstract: A shelf-stable water-borne dispersion or solution that cures rapidly and at low temperatures when coated onto a substrate can be prepared with an aqueous-based solution or stable aqueous dispersion of a polymer having a backbone containing pendant silanol groups which are sufficiently neutralized to inhibit silanol condensation.

Abstract: Curable perfluoroelastomer compositions are disclosed that comprise ammonia and uncured perfluorinated elastomers having copolymerized units of nitrile-containing cure site monomers. Such compositions are curable at low temperatures. In addition, curable perfluoroelastomer compositions are disclosed wherein ammonia functions as a cure rate accelerator in the presence of other curing agents.

Abstract: This invention describes the use of blocked mercaptosilanes wherein the hydrogen atom of the mercaptan functionality has been substituted to manufacture coating, adhesive, sealant and elastomeric compositions. The blocked mercaptosilanes described are unique in that they allow the application of elastomers to substrates to proceed while remaining inert toward coupling to the catalyst. The coupling reactions of these blocked mercaptosilicon compounds are triggered by exposure to an appropriate deblocking agent.

Abstract: A heat-resistant rubber composition of the invention is a vulcanizable composition comprising a specific ethylene-&agr;-olefin-nonconjugated polyene copolymer rubber (A) and an organic peroxide (B). This heat-resistant composition has high crosslinking efficiency given by the organic peroxide and high modulus, and can provide a vulcanized rubber molded product of excellent resistance to environmental deterioration such as thermal aging resistance. The other heat-resistant rubber composition of the invention is a vulcanizable composition comprising 100 parts by weight of a specific ethylene-&agr;-olefin-nonconjugated polyene copolymer rubber (A) composed of ethylene, an &agr;-olefin or 3 to 20 carbon atoms and a nonconjugated polyene which is a vinyl end group-containing norbornene compound, 0.2 to 5 parts by weight of an amine type anti-aging agent (C) and/or a hindered phenol type anti-aging agent (D), 1 to 10 parts by weight of a sulfur type anti-aging agent (E) and an organic peroxide (B).