Abstract:
A pressure-sensitive tape comprising a backing, a layer of corrosion-resi stant filaments on one surface of the backing, and pressure-sensitive adhesi ve layer that coats the filaments and binds them to the backing. A method fo r constructing a member for undersea deployment is provided, which comprises providing at least one tubular member, winding a wire reinforcement about t he tubular member(s); and winding a corrosion- resistant filament-reinforced material over the wire reinforcement; and coating the filament reinforced m ember(s) with a layer of extruded polymer.
Abstract:
Un proceso que incluye los siguientes pasos: proporcionar un extrusor de rodillos planetario que tiene una pluralidad de secciones formadoras del compuesto incluyendo un mandril principal rodeado por y engranada internamente con una pluralidad de mandriles planetarios; introducir los monomeros y el iniciador en una primera seccion formadora del compuesto; producir una composicion homogenea; calentar la composicion para iniciar la polimerizacion por radicales libres; introducir los monomeros y el iniciador en una o mas de las secciones formadoras de compuestos restantes y continuar la polimerizacion; descargar la composicion polimerizada; y opcionalmente, tomar una porcion de la composicion descargada del extrusor de rodillos planetarios y regresarla hacia la primera seccion formadora de compuesto.
Abstract:
A process for continuous bulk polymerization is disclosed that includes providing a plug flow reactor comprising a primary loop reactor including a loop for recirculating a portion of a polymer-in-progress at a polymer flow rate back to a reactor in the primary loop reactor, introducing at least one monomer into the primary recirculation loop reactor at a monomer flow rate, polymerizing the monomer in the primary recirculation loop reactor in the presence of an initiator by way of a free-radical polymerization to form a polymer-in-progress, and recirculating a first portion of the polymer-in-progress through the loop into a reactor in the primary loop reactor to combine with the monomer at a ratio of polymer flow rate to monomer flow rate that is greater than 5.
Abstract:
A testing device for testing adhesion seal strength of a tape to a substrate. The testing device includes a body defining a chamber having a first port in fluid communication with the chamber, a platform sealingly attached to the chamber and having an elongate opening or a plurality of openings therethrough as a second port of the chamber. The testing device further includes a frame removably mounted to the platform. The frame defines a perimeter that surrounds the second port and, when mounted to the platform, secures a test substrate thereunder against the platform with a fluid-tight seal. Methods for preparing a test sample and methods of operating the testing device are also disclosed.
Abstract:
Masking tapes that changes color when the tape is rubbed down or dispensed onto an adherend and methods of making such tapes are disclosed herein. The tape includes a backing, a layer of adhesive on the bottom surface of the backing, and a release structure on the top surface of the backing that includes a pressure-chromic indicator and a release layer. The pressure-chromic indicator is characterized in that it is not activated by the pressure applied during the manufacturing process, but is activated by the pressure applied when the tape is rubbed or dispensed onto an adherend.
Abstract:
A process for preparing a pressure sensitive adhesive using a modified planetary roller extruder (10) is described. The process in accordance with one aspect of the invention includes introducing primary raw materials including a non-thermoplastic elastomer into a feeding section (12) of the modified planetary roller extruder (10), conveying the raw materials from the feeding section (12) to a compounding section (14) of the modified planetary roller extruder (10), continuously mixing the primary raw materials in the compounding section (14) to produce a homogeneous adhesive composition. The adhesive composition may be applied to a web-form material. The compounding section (14) of the modified planetary roller extruder (10) includes a main spindle (26) surrounded by and intermeshed with a plurality of planetary spindles (28, 30) at least one of which is a double transversal mixing spindle having a plurality of back-cut helical flights.
Abstract:
A process for preparing a pressure sensitive adhesive using a modified planetary roller extruder (10) is described. The process in accordance with one aspect of the invention includes introducing primary raw materials including a non-thermoplastic elastomer into a feeding section (12) of the modified planetary roller extruder (10), conveying the raw materials from the feeding section (12) to a compounding section (14) of the modified planetary roller extruder (10), continuously mixing the primary raw materials in the compounding section (14) to produce a homogeneous adhesive composition. The adhesive composition may be applied to a web-form material. The compounding section (14) of the modified planetary roller extruder (10) includes a main spindle (26) surrounded by and intermeshed with a plurality of planetary spindles (28, 30) at least one of which is a double transversal mixing spindle having a plurality of back-cut helical flights.
Abstract:
A process for producing polymer and more particularly adhesive using a recirculating loop reactor. In one embodiment the reactor includes one or more mixers to mix feed stock with the polymerized material recirculating in the reactor. In another embodiment a planetary roller extruder (PRE) may be used for this purpose. In still another embodiment, a combination of one or more static mixers and one or more PREs may be used.
Abstract:
A process for producing polymer and more particularly adhesive using a recirculating loop reactor. In one embodiment the reactor includes one or more mixers to mix feed stock with the polymerized material recirculating in the reactor. In another embodiment a planetary roller extruder (PRE) may be used for this purpose. In still another embodiment, a combination of one or more static mixers and one or more PREs may be used.