# US 12,000,523 B2 · Cross-linked polyethylene type a (PEX-A) pipe

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- Number: US 12,000,523 B2
- Document ID: US12000523B2
- Status: Granted
- Kind: B2
- Application number: 17/465,799
- Filed: 2021-09-02
- Published: 2022-03-03
- Granted: 2024-06-04
- Earliest claimed: 2020-09-02
- Assignees: Rifeng Enterprise Group Co., Ltd.; Rifeng Enterprise (Foshan) Co., Ltd.; Rifeng Technology Co., Ltd.
- Applicants: Rifeng Enterprise Group Co., Ltd.; Rifeng Enterprise (Foshan) Co., Ltd.; Rifeng Technology Co., Ltd.
- Inventors: Lei Wang; Guozhi Xu; Zhiqiang Zheng
- Web page: https://patentgrep.com/patent/US12000523B2

## CPC

- B32B 1/08: Tubular products
- F16L 9/121: {with three layers}
- B32B 27/08: of synthetic resin
- B32B 27/18: characterised by the use of special additives
- B32B 27/26: using curing agents
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08F 10/02: Ethene
- B32B 2250/03: 3 layers
- B32B 2250/242: All polymers belonging to those covered by group B32B27/32
- B32B 2307/71: Resistive to light or to UV
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- F16L 2201/44: sterile
- Y02A 20/20: Controlling water pollution; Waste water treatment
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- F16L: PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- Y02A: TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE

## Abstract

The present disclosure discloses a PEX-A pipe, the pipe wall of the PEX-A pipe includes a PEX-A antibacterial layer, a PEX-A main body layer, and an anti-ultraviolet (UV) layer that are sequentially attached from inside to outside. The anti-UV layer is attached to the outer side of the PEX-A main body layer to enhance the weather resistance and aging resistance and prolong the service life of the pipe. The PEX-A antibacterial layer is attached to the inner side of the PEX-A main body layer to inhibit the growth and reproduction of bacteria in water in the pipe and improve the quality of drinking water.

## Claims

### Claim 1

A cross-linked polyethylene type A (PEX-A) pipe, wherein a pipe wall of the PEX-A pipe comprises a PEX-A antibacterial layer (1), a PEX-A main body layer (2), and an anti-ultraviolet (UV) layer (3) from inside to outside, wherein the PEX-A antibacterial layer (1) is attached to the PEX-A main body layer (2), and the PEX-A main body layer (2) is attached to the anti-UV layer (3);
wherein the PEX-A antibacterial layer (1), the PEX-A main body layer (2), and the anti-UV layer (3) have a thickness ratio of (1-3):(9-11):(0.5-1).

### Claim 2 (depends on 1)

The PEX-A pipe according to claim 1, wherein materials for the PEX-A antibacterial layer (1) are PEX-A and an antibacterial agent.

### Claim 3 (depends on 2)

The PEX-A pipe according to claim 2, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

### Claim 4 (depends on 1)

The PEX-A pipe according to claim 1, wherein a material for the PEX-A main body layer (2) is PEX-A.

### Claim 5 (depends on 4)

The PEX-A pipe according to claim 4, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.

### Claim 6 (depends on 1)

The PEX-A pipe according to claim 1, wherein materials for the anti-UV layer (3) are PE, an anti-UV additive, and an antioxidant.