摘要:
A process for manufacturing a multilayer article, the article comprising two crosslinked semiconductive layers separated by and bonded to an insulation layer, the semiconductive layers formed from a peroxide-crosslinkable olefin elastomer and the insulation layer comprising composition comprising a silane-grafted olefinic elastomer, the process comprises the steps of: (A) injecting the silane-grafted olefinic elastomer between the two crosslinked semiconductive layers so as to have direct contact with each semiconductive layer, and (B) crosslinking the silane-grafted olefinic elastomer in the absence of a peroxide catalyst.
摘要:
A process for manufacturing a multilayer article, the article comprising two crosslinked semiconductive layers separated by and bonded to an insulation layer, the semiconductive layers formed from a peroxide-crosslinkable olefin elastomer and the insulation layer comprising composition comprising a silane-grafted olefinic elastomer, the process comprises the steps of: (A) injecting the silane-grafted olefinic elastomer between the two crosslinked semiconductive layers so as to have direct contact with each semiconductive layer, and (B) crosslinking the silane-grafted olefinic elastomer in the absence of a peroxide catalyst.
摘要:
Crosslinked, melt-shaped articles are manufactured by a process that does not require the use of post-shaping external heat or moisture, the process comprising the steps of: A. Forming a crosslinkable mixture of a 1. Organopolysiloxane containing one or more functional end groups; and 2. Silane-grafted or silane-copolymerized polyolefin; and B. Melt-shaping and partially crosslinking the mixture; and C. Cooling and continuing crosslinking the melt-shaped article. Crosslinking is promoted by the addition of a catalyst to the mixture before or during melt-shaping or to the melt-shaped article.
摘要:
Crosslinked, melt-shaped articles are manufactured by a process that does not require the use of post-shaping external heat or moisture, the process comprising the steps of: A. Forming a crosslinkable mixture of a 1. Organopolysiloxane containing one or more functional end groups; and 2. Silane-grafted or silane-copolymerized polyolefin; and B. Melt-shaping and partially crosslinking the mixture; and C. Cooling and continuing crosslinking the melt-shaped article. Crosslinking is promoted by the addition of a catalyst to the mixture before or during melt-shaping or to the melt-shaped article.
摘要:
Tapes comprising (A) a first ribbon comprising (1)(a) a polyolefin containing at least one silane functionality, and (1)(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.
摘要:
Tapes comprising (A) a first ribbon comprising (1)(a) a polyolefin containing at least one silane functionality, and (1)(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.
摘要:
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.
摘要:
Scorch is inhibited during the free-radical crosslinking of a crosslinkable polymer, e.g., an EPDM, by incorporating into the polymer before melt processing and crosslinking a scorch inhibiting amount of a derivative, preferably an ether, ester or urethane derivative, of a TEMPO compound, e.g., 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl. The scorch inhibitors of this invention perform as well, if not better, than their 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl counterparts in similar polymer compositions and under similar conditions in terms of scorch inhibition and ultimate degree of crosslinking, but exhibit less volatility and less migration within the polymer composition.
摘要:
A molded or extruded article, e.g., an electrical part or shielded cable, comprises at least one insulation layer and at least one semiconductive layer, the semiconductive layer thick and comprising in weight percent: A. 1 to 30 wt % of conductive filler; B. 10 to 90 wt % of a non-olefin elastomer; C. 10 to 90 wt % of an olefin elastomer; and D. Optionally, 0.5 to 2.5 wt % of peroxide. Carbon black and/or metal particulates or powder typically comprise the filler, silicone or urethane rubber the non-olefin elastomer, and EPR or EPDM the olefin elastomer.
摘要:
Scorch is inhibited during the free-radical crosslinking of a crosslinkable polymer, e.g., an EPDM, by incorporating into the polymer before melt processing and crosslinking a scorch inhibiting amount of a derivative, preferably an ether, ester or urethane derivative, of a TEMPO compound, e.g., 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl. The scorch inhibitors of this invention perform as well, if not better, than their 4-hydroxy-tetrahydrocarbylpiperidin-1-oxyl counterparts in similar polymer compositions and under similar conditions in terms of scorch inhibition and ultimate degree of crosslinking, but exhibit less volatility and less migration within the polymer composition.