Patent ID: 8286667

Claim:
A water transmission tubing for controlling the flow of water under pressure, comprising: an irrigation conduit having a tubular inner wall having an inner surface for contact with water traveling in the conduit, the structural component of the tubular inner wall consisting of an extrudable thermoplastic polyolefin material, in which the polyolefin material forming said inner wall is selected from the group consisting of LDPE, LLDPE, HDPE, and polypropylene, an anti-bacterial agent dispersed throughout the polyolefin material so as to prevent the growth of slime on the inner surface of the tubular inner wall caused by contact between the flow of water and the inner surface, and a slip additive blended with and dispersed in the polyolefin material in a sufficient amount such that the inner wall, in an extruded form thereof, provides a smooth inner surface that inhibits adhesion of slime and other bacterial or organic growth to the inner surface, in which the slip additive comprises one of (a)-(c): (a) a fluoroelastomer, a fluoropolymer, or mixtures thereof, or (b) a fluoroelastomer comprising vinylidene fluoride and hexafluoropropylene, or (c) vinylidene fluoride, hexafluoropropylene, fluoroethylene, or mixtures thereof.