Abstract: Extruded polymer foams are prepared using brominated fatty acids, an ester, amide or ester-amide of a brominated fatty acid, a glyceride of one or more brominated fatty acids, or a polymerized brominated fatty acid as an FR additive. The brominated FR additives unexpectedly are stable at the extrusion temperatures, and provide excellent flame retardancy to the foams.

Abstract: A tube cutter mechanism supports an arm from which a tube supporting anvil extends, the anvil being aligned with the tube cutter mechanism for cutting the supoorted tube. During cutting, an axial force is imposed on the tube and anvil. The arm is formed such that it bends in response to the force, storing energy such that rotation of the tube occurs for more than one revolution of the tube without advancing the cutter wheel. The device is formed of molded glass fiber reinforce nylon, preferably ZYTEL. In a second embodiment, the arm does not bend and the anvil is constructed so as to bend relative to the arm in response to the axial cutting force permitting rotation of the tube during cutting beyond a single revolution without advancing the cutter wheel. The anvil advantageously does not have a cutter wheel for burnishing the tube to remove oxides during cutting.

Abstract: Tube cutting apparatus comprises means (4) supporting the tube (3, 11) during the cutting operation and at the same time allowing the rotatory movement of the tube about its longitudinal axis, a shaft (28), wherein a cutting blade (38) and a means (36) for rotating the tube are disposed concentrically and means (27, 31) for moving the shaft (28) in direction substantially perpendicular to the longitudinal axis of the tube (3, 11) to be cut and for rotating the shaft (28) about its longitudinal axis. The means (36) for rotating the tube is of a greater diameter than the cutting blade.

Abstract: A flying cutoff apparatus for cutting longitudinally moving and axially rotating tubing includes a track positioned along and generally parallel to the direction of longitudinal movement of the tubing, a carriage mounted on the track adjacent to the tubing for movement along the track, a cutter mechanism mounted on the carriage adjacent the tubing and stationary relative to axial rotation thereof, and an actuator, such as a hydraulic cylinder, mounted on the carriage for moving the cutter mechanism relative to the carriage and between non-cutting and cutting positions.