Cooper-Standard has filed a patent for a coated metal pipe designed for automotive fluid transport. The pipe features a circular cross-sectional profile, an intermediate layer primer, and an outer layer made of polyamide with an immiscible additive such as UHMW silicones, UHMW polyethylene, or PTFE. GlobalData’s report on Cooper-Standard gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Cooper-Standard, expandable microsphere foams was a key innovation area identified from patents. Cooper-Standard's grant share as of June 2023 was 1%. Grant share is based on the ratio of number of grants to total number of patents.
Coated metal pipe for automotive fluid transport tube
A recently filed patent (Publication Number: US20230184353A1) describes a coated metal pipe designed for use as an automotive fluid transport tube. The pipe consists of a single or double-walled tubing with a circular cross-sectional profile. The tubing is coated with an intermediate layer primer and an outer layer made of a polyamide that incorporates an immiscible additive.
The immiscible additive used in the outer layer can be selected from Ultra High Molecular Weight (UHMW) silicones, UHMW polyethylene (UHMW-PE), polytetrafluoroethylene (PTFE), or mixtures thereof. This additive enhances the performance and durability of the pipe.
The polyamide layer of the coated metal pipe may also include a sacrificial outer layer made of PA11, PA6,10, PA6/12, or PA12. This sacrificial layer provides additional protection against corrosion and wear.
The tubing of the coated metal pipe can be made of steel, including copper-plated low carbon steel, low carbon steel, stainless steel, or aluminum. In some embodiments, a nickel plating is applied to the inner diameter of the tubing for further corrosion resistance.
The intermediate layer, applied over the tubing, can consist of a corrosion inhibiting zinc/aluminum alloy or a corrosion inhibiting magnesium alloy. These alloys may contain additional elements such as aluminum, zinc, manganese, silicon, copper, rare earth metals, or zirconium to enhance their corrosion resistance properties.
The patent also describes a method for manufacturing the coated metal pipe. The method involves forming a copper-plated carbon steel tubing with a circular cross-sectional profile, applying an intermediate primer layer with a corrosion inhibiting alloy, and then applying an outer polyamide layer compounded with the immiscible additive.
Additional steps in the manufacturing process include applying a nickel plating to the inner diameter of the tubing and selecting the intermediate layer from a group of options such as a chrome-free conversion coating, primer or primer/adhesive coating, or passivation coating copper coating. The polyamide layer can be selected from a group of sacrificial outer layers, including PA 6/12, PA6/10, PA11, or PA12.
Overall, this patent presents a coated metal pipe design and manufacturing method that offers improved corrosion resistance and durability for automotive fluid transport applications.
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