초록

A filled, low or medium density polyethylene or other polyolefin composition is used to form a polymer coating on an internal cylindrical metal surface such as, for example, the interior surface of a pipe.

대표청구항 ▼

A method of forming a filled polymer coating on an internal, cylindrical, metal surface comprising: (a) providing a homogenous mixture of particles of a low or medium density polyethylene or other olefin polymer or copolymer and particles of an inert filler having a particle size in the range of fro

A method of forming a filled polymer coating on an internal, cylindrical, metal surface comprising: (a) providing a homogenous mixture of particles of a low or medium density polyethylene or other olefin polymer or copolymer and particles of an inert filler having a particle size in the range of from about 4 mesh to about 325 mesh, the weight ratio of polymer to filler ranging from about 1:2 to about 10:1 within the space defined by an internal, cylindrical, metal surface which is rotating about its longitudinal axis, said internal, metal surface being at a temperature above the melting point of said polyethylene, olefin polymer or copolymer, but below the melting or decomposition point of said filler, (b) uniformly depositing said mixture of particles on said hot, rotating, internal metel surface at a rate such that the mixture is held substantially stationary at the point of deposition with respect to the internal metal surface by the centrifugal force of the rotating cylindrical surface whereby the polymer or copolymer component of the mixture melts to form a viscous, filled film which remains substantially stationary with respect to said internal metal surface by reason of said centrifugal force; and, (c) cooling said coating to a temperature below the melting point of said polyethylene, olefin polymer or copolymer.