Abstract:
An injection molding process for making a plastic article, the process comprising the steps of: A. Forming a moisture-curable composition comprising a 1. Silane-functionalized polyethylene, 2. Moisture source, e.g., a moisture-containing filler, wherein the moisture source excludes alcohols, and 3. Condensation catalyst; B. Injecting the composition into a mold; C. Subjecting the composition to conditions sufficient to 1. Release moisture from the moisture source, and 2. Partially cure the composition; D. Removing the partially cured composition from the mold; and E. Continuing the cure of the composition outside of the mold. The process is particularly well suited for the manufacture of thick parts, such as wire and cable elastomeric connectors.
Abstract:
An injection molding process for making a plastic article, the process comprising the steps of: A. Forming a moisture-curable composition comprising a 1. Silane-functionalized polyethylene, 2. Moisture source, e.g., a moisture-containing filler, wherein the moisture source excludes alcohols, and 3. Condensation catalyst; B. Injecting the composition into a mold; C. Subjecting the composition to conditions sufficient to 1. Release moisture from the moisture source, and 2. Partially cure the composition; D. Removing the partially cured composition from the mold; and E. Continuing the cure of the composition outside of the mold. The process is particularly well suited for the manufacture of thick parts, such as wire and cable elastomeric connectors.
Abstract:
Tapes comprising (A) a first ribbon comprising (l)(a) a polyolefin containing at least one silane functionality, and (l)(b) a hydroxy-terminated silicone polymer, or (2) a blend of a vinyl silane, polyolefin, organic initiator, e.g., peroxide, and a hydroxy-terminated silicone polymer, and (B) a second ribbon comprising a catalyst masterbatch, the second ribbon carried on the first ribbon, allow for the delivery of a consistent mixture of resin and catalyst to an injection molding machine.
Abstract:
Polymer compositions comprise a (i) silane-fknctionalized polymer, e.g., a polyethylene grafted with vinyl triethoxy silane, (H) polyfunctional alcohol e.g., a,a,a',a'~ tetramethyl-I,3-benzenediethanol and, optionally, (iii) acid, e.g., an alkylated aryl disulfonic acid. The use of polyfunctional alcohols in the absence of a strong acid yields a light- crosslinking of the silane-functionalized polymer and this, in turn, provides a polymer melt with improved extensional properties such as elongational viscosity and melt strength. The use of a polyfunctional alcohol in combination with a blocked strong acid provides a slow rate of crosslinking during melt processing and a high degree of ultimate crosslinking after the polymer composition has been shaped or molded.
Abstract:
The present invention yields a coagent-mediated, grafted copolymer prepared from a free radical-mediated reaction of a mixture containing or made from (a) a first free-radical reactive organic polymer, (b) a second free-radical reactive organic polymer, and (c) a coagent selected from the group consisting of allyl, vinyl, and acrylate coagents, wherein the first and second organic polymers are chemically dissimilar polymers as determined by at least one physical property yet the organic polymers have similar reactivity in radical-mediated additions to the coagent.
Abstract:
A process for preparing a functionalized polyolefin is described. The process comprises the step of reacting: (i) a polyolefin, (ii) a compound containing a functional group, and (iii) a coagent compound having Formula (I): X n - Y -Z m wherein: Y is a core moiety; Z is a moiety containing a carbon-carbon double bond or a carbon-carbon triple bond; X is a moiety different than Z and the bond between X and Y may be a single bond or a double bond; n is a whole number greater than or equal to 0; m is a whole number greater than or equal to 2; and m+n equals a number up to the valence of Y; wherein: (a) when m is 2 and n is 0, the process comprises initially reacting the polyolefin and the coagent to form a product that is then reacted with the compound containing the functional group, and (b) the compound containing a functional group is substantially inert in free radical-mediated polymerization reactions and in free radical-mediated grafted reactions. The invention also relates to a functionalized polyolefin produced by such a process. The functionalized polyolefins have improved chemical and physical properties and are used in the preparation of composites ans blends applied, for example, in packaging and automotive industry.
Abstract:
Crosslinkable polymeric compositions comprising a thermoplastic, non-elastomer ethylene-based polymer, an organic peroxide, and a crosslinking coagent comprising N, N, N', N', N", N" -hexaallyl-1, 3, 5-triazine-2, 4, 6-triamine. Such crosslinkable polymeric compositions and their crosslinked forms can be employed as polymeric layers in wire and cable applications, such as insulation in power cables.
Abstract:
Crosslinkable polymeric compositions comprising an ethylene-based polymer, an organic peroxide, and a crosslinking coagent having at least one N, N-diallylamide functional group. Such crosslinkable polymeric compositions and their crosslinked forms can be employed as polymeric layers in wire and cable applications, such as insulation in power cables.
Abstract:
Polymer compositions comprise a (i) silane-fknctionalized polymer, e.g., a polyethylene grafted with vinyl triethoxy silane, (H) polyfunctional alcohol e.g., α,α,α',α'~ tetramethyl-I,3-benzenediethanol and, optionally, (iii) acid, e.g., an alkylated aryl disulfonic acid. The use of polyfunctional alcohols in the absence of a strong acid yields a light- crosslinking of the silane-functionalized polymer and this, in turn, provides a polymer melt with improved extensional properties such as elongational viscosity and melt strength. The use of a polyfunctional alcohol in combination with a blocked strong acid provides a slow rate of crosslinking during melt processing and a high degree of ultimate crosslinking after the polymer composition has been shaped or molded.
Abstract:
The present invention yields a coagent-mediated, grafted copolymer prepared from a free radical-mediated reaction of a mixture containing or made from (a) a first free-radical reactive organic polymer, (b) a second free-radical reactive organic polymer, and (c) a coagent selected from the group consisting of allyl, vinyl, and acrylate coagents, wherein the first and second organic polymers are chemically dissimilar polymers as determined by at least one physical property yet the organic polymers have similar reactivity in radical-mediated additions to the coagent.