Patent application number | Description | Published |
20090005509 | Curing of rubbers and thermoplastic vulcanizates in the absence of halogen donors - Aspects of the invention include a method of curing a rubber composition comprising providing a rubber; intimately contacting a curative agent with the rubber; wherein the curative agent consists essentially of a phenol formaldehyde resin, a metal oxide and a carboxylic acid metal salt. Another aspect of the present invention is to a method of curing a rubber composition comprising providing a rubber; intimately contacting a curative agent with the rubber; wherein the curative agent comprises a phenol formaldehyde resin and carboxylic acid metal salt; and wherein halogen-donating species are absent from the rubber and curative agent. | 01-01-2009 |
20090115108 | Ethylene-Propylene Terpolymers in Tire Sidewalls - Disclosed is an ethylene-propylene-diene terpolymer having isotactic polypropylene crystallinity compounded with a blend rubber wherein the terpolymer can be present in an amount effective to improve tack, aged tensile strength retention, fatigue resistance, ozone cracking resistance, and reversion resistance. Also disclosed is an elastomer composition wherein the terpolymer can have at least 60 wt % propylene-derived units, at least 6 wt % ethylene-derived units and from 0.3 to 10 wt % diene-derived units, and a tire sidewall composition comprising from 10 to 30 phr terpolymer, from 20 to 60 phr natural rubber, from 20 to 60 phr polybutadiene rubber, and an optional secondary blend rubber. Also disclosed is a vulcanizate of the elastomer composition, and articles, tire sidewalls, tires, retreaded tires, bias truck tires, off-road tires, and passenger automobile tires made with the vulcanizate. Further disclosed are processes for making molded articles and tires, and for retreading tires. | 05-07-2009 |
20090247656 | Closed Cell Propylene-Ethylene Foam - A closed cell foam material contains a propylene based polymer comprising from about 5% to about 32% by weight α-olefin units. The propylene based polymer has a heat of fusion, as determined by DSC, of less than 80 J/g. The material also contains 0.5 to 5 phr peroxide, 1.0 to 5.0 phr blowing agent, and 0.1 to 10 phr co-agent. The cells of closed cell foam material have a diameter in the range of 0.1 to 1.5 mm. | 10-01-2009 |
20090258209 | Translucent Propylene-Based Elastomeric Compositions - A composition is described in one aspect as comprising one or more propylene-α-olefin terpolymers; wherein the propylene-α-olefin terpolymer(s) possess a melting temperature (T | 10-15-2009 |
20110021710 | Crosslinkable Propylene-Based Copolymers, Methods for Preparing the Same, and Articles Made Therefrom - 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. | 01-27-2011 |
20110060086 | Elastomeric Copolymers, Copolymer Compositions, and Their Use in Articles - A copolymer is formed from an isoolefin having from 4 to 7 carbon atoms and an alkylstyrene. The copolymer has a substantially homogeneous compositional distribution. The copolymer has from about 8 to about 12 wt % of alkylstyrene and at least 85 wt % of isoolefin. The copolymer is preferably halogenated with about 1.1 to about 1.5 wt % of a halogen. The copolymer may in elastomeric nanocomposites. To obtain a good dispersion of the nanoclay in a formulated compound, at least one cure accelerator is selected from the group consisting of mercaptobenzothiazole disulfide, mercaptobenzothiazole, cyclohexyl benzothiazole disulfide, dibutyl thiourea, tetramethylthiuram disulfide, 4-4-dithiodimropholine, zinc dimethyldithiocarbamate, and zinc dibutylphosphorodithiate. | 03-10-2011 |
20110124814 | Thermoset Compositions with Dispersed Thermoplastic Resin Therein and Process for Making Them - A rubber composition comprising: a cured rubber; and thermoplastic resin, where the thermoplastic resin is in the form of discrete domains dispersed within a continuous phase of the cured rubber, and where the cured rubber includes silicon-containing crosslinks. | 05-26-2011 |
20110152422 | Elastomeric Nanocomposites, Nanocomposite Compositions, and Methods of Manufacture - A nanocomposite is formed from at least one copolymer and at least one nanofiller. The copolymer is formed of units derived from isoolefins having from 4 to 7 carbon atoms and multiolefins. The nanofiller comprising a surfactant wherein the surfactant has the structure of (R | 06-23-2011 |
20110169199 | Process For Preparing Articles - The present invention relates to a process for preparing a thermoplastic vulcanizate (TPV) comprising: contacting a thermoplastic polymer, a cross-linkable elastomer, at least one curative, and at least one cure activator in a solvent to form Composition A. The solvent is then removed, and thereafter the cross-linkable elastomer is at least partially cured. The average particle size of the cross-linkable elastomer is 10 microns or less after the solvent is removed. | 07-14-2011 |
20110196101 | Homogeneous Polymer Blend and Process of Making the Same - A homogeneous polymer blend comprises a thermoplastic first polymer having a crystallinity of at least 30%; and a second polymer having a crystallinity of more than 5% and being at least partially cross-linked. | 08-11-2011 |
20110196102 | Heterogeneous Polymer Blend With Continuous Elastomeric Phase And Process Of Making The Same - A heterogeneous polymer blend comprises a dispersed phase comprising a thermoplastic first polymer having a crystallinity of at least 30% and a continuous phase comprising a second polymer different from the first polymer. The second polymer has a crystallinity of less than 20% and is at least partially cross-linked. | 08-11-2011 |
20120045600 | Solution Blending Process for Preparing Thermoplastic Vulcanizates - This invention relates to the preparation of thermoplastic vulcanizates (TPVs) with unique morphological features, more specifically, this invention relates to a method for preparing TPV compositions wherein the mixing of plastomers and elastomers are carried out in solvent with curatives to induce cross-linking. | 02-23-2012 |
20120077898 | Crosslinked Polyolefin Polymer Blends - Crosslinked polyolefin blends, methods for their production, and articles made of the same are provided. In at least one specific embodiment, the polyolefin blends comprise a first polymer formed in a first reactor and a second polymer formed in a second reactor. The first and second polymers, as well as the resulting blend, may comprise units derived from propylene, ethylene, and a diene. The blended composition can then be compounded with one or more coagents, antioxidants, UV sensitizers, and/or other additives and crosslinked, preferably by exposure to UV radiation and/or energetic photons. The crosslinked polymers are particularly useful for making fibers, films, and nonwovens. | 03-29-2012 |
20120202915 | Crosslinked Polyolefin Polymer Blends - Crosslinked polyolefin blends, methods for their production, and articles made of the same are provided. In at least one specific embodiment, the polyolefin blends comprise a first polymer formed in a first reactor and a second polymer formed in a second reactor. The first and second polymers, as well as the resulting blend, may comprise units derived from propylene, ethylene, and a diene. The blended composition can then be compounded with one or more coagents, antioxidants, and/or other additives and crosslinked, preferably by exposure to energetic photons. The crosslinked polymers are particularly useful for making fibers, films, and nonwovens. | 08-09-2012 |
20120220682 | Polyolefin-Based Crosslinked Articles - Methods for making a crosslinked elastomeric composition and articles made of the same are provided. In at least one specific embodiment, an elastomeric composition comprising at least one propylene-based polymer is blended with at least one component selected from the group consisting of multifunctional acrylates, multifunctional methacrylates, functionalized polybutadiene resins, functionalized cyanurate, and allyl isocyanurate; and blended with at least one component selected from the group consisting of hindered phenols, phosphites, and hindered amines. The propylene-based polymer can include propylene derived units and one or more dienes, and have a triad tacticity of from 50% to 99% and a heat of fusion of less than 80 J/g. The blended composition can then be extruded and crosslinked. The extruded polymer can be crosslinked using electron beam radiation having an e-beam dose of about 100 KGy or less. The crosslinked polymers are particularly useful for making fibers and films. | 08-30-2012 |
20120225990 | Ethylene-Vinyl Alcohol Based Thermoplastic Elastomers and Vulcanizates - Ethylene-vinyl alcohol (EVOH) based thermoplastic elastomers (TPE) and thermoplastic vulcanizates (TPV) including a cured rubber dispersed therein and an EVOH-rubber compatibilizer. | 09-06-2012 |
20120309862 | Crosslinked Compositions, Method of Making Them, and Articles Comprising Them - The present invention relates to a composition comprising at least one propylene-based polymer comprising less than 0.1 wt. % diene-derived units based on the weight of the propylene-based polymer, an antioxidant, and a co-agent. The composition can be at least partially crosslinked by electron beam irradiation in a dose of less than 200 kGy, and may be further formed into articles including fibers, yarns, films, and nonwovens, among others. The propylene-based polymer of the present invention may be a polymer blend formed by forming a reactor blend from of two or more polymers produced in two or more reactors. | 12-06-2012 |
20130096222 | Polyolefin-Based Crosslinked Compositions and Methods of Making Them - Provided is a method for providing a composition comprising at least one propylene-based polymer; at least one of multifunctional acrylates, multifunctional methacrylates, functionalized polybutadiene resins, functionalized cyanurate, and allyl isocyanurate; at least one of hindered phenols, phosphites, and hindered amines; and at least one photoinitiator for UV curing. The propylene-based polymer can include propylene derived units and one or more dienes, and have a triad tacticity of from 50% to 99% and a heat of fusion of less than 80 J/g. The composition can be extruded and crosslinked. The crosslinked composition is particularly useful for making films and fibers. | 04-18-2013 |
20140155513 | Methods of Forming Compositions and Articles - A method for forming a composition comprising a propylene-based polymer and a co-agent is provided. The method comprises introducing a propylene-based polymer to an extruder and introducing the co-agent to the extruder at a position within the extruder where the temperature is from 23° C. to 125° C. | 06-05-2014 |
20140309358 | Vulcanized Polymer Blends - A heterogeneous vulcanized polymer blend comprising a continuous phase comprising a thermoplastic polypropylene having a crystallinity of at least 30% and a dispersed phase comprising particles of an elastomeric copolymer dispersed in the continuous phase and having an average particle size of less than 5 micron. The elastomeric copolymer has a crystallinity of less than 20% and is at least partially cross-linked such that no more than about 80 wt % of the elastomeric copolymer is extractable in cyclohexane at 23° C. | 10-16-2014 |
20140309359 | Heterogeneous In-Situ Polymer Blend - A heterogeneous in-situ polymer blend comprising a continuous phase comprising a polypropylene having a crystallinity of at least 30% and a melting point temperature T | 10-16-2014 |
20150021816 | Propylene Copolymers in Elastomeric Compositions - Disclosed is an ethylene-propylene copolymer having isotactic polypropylene crystallinity compounded with a halobutyl rubber in an amount effective to improve one or more of aged tensile strength retention, fatigue resistance, and dimensional stability. Also disclosed is an elastomer composition wherein the copolymer can have at least 60 wt % propylene-derived units and at least 6 wt % ethylene-derived units, and a tire inner tube or tire innerliner composition comprising from 1 to 10 phr copolymer. Also disclosed is a vulcanizate of the elastomer composition, and articles, tire innerliners, tires, and tire inner tubes comprising the vulcanizate. Further disclosed are processes for making molded articles, tire inner tubes and tires. | 01-22-2015 |