Composite tube and method of making

Patent metadata

Field	Value
Publication number	US-11933430-B2
Application number	US-202217663882-A
Country	US
Kind code	B2
Filing date	May 18, 2022
Priority date	May 18, 2021
Publication date	Mar 19, 2024
Grant date	Mar 19, 2024

Abstract

A composite tube includes a first layer including a cross-linked polyolefin elastomer, wherein the first layer is configured for fluid contact; and a second layer adjacent to the first layer, the second layer including an elastomer.

First claim

What is claimed is:

1. A composite tube comprising:
a first layer comprising a cross-linked polyolefin elastomer, wherein the first layer is configured for fluid contact, wherein the cross-linked polyolefin elastomer has a flexural modulus of less than 10,000 pounds per square inch (psi); and
a second layer adjacent to the first layer, the second layer comprising an elastomer.

2. The composite tube in accordance with claim 1 , wherein the cross-linked polyolefin elastomer comprises a C2-C10 carbon-based elastomer.

3. The composite tube in accordance with claim 2 , wherein the cross-linked polyolefin elastomer comprises polypropylene, polyethylene, a copolymer of ethylene with propylene, a copolymer of ethylene with an alpha-olefin, a copolymer of ethylene with a polar vinyl monomer, a terpolymer of ethylene, maleic anhydride, and an acrylate, an ionomer of ethylene and acrylic acid and optionally a third monomer, an ionomer of ethylene and methacrylic acid and optionally a third monomer, or combination thereof.

4. The composite tube in accordance with claim 1 , wherein the cross-linked polyolefin elastomer is cross-linked via the cross-linking agent, wherein the cross-linking agent comprises a peroxide, an azo compound, a silane, or combination thereof.

5. The composite tube in accordance with claim 4 , wherein the peroxide is present in the polyolefin elastomer at an amount of about 0.2 phr to about 5 phr.

6. The composite tube in accordance with claim 1 , wherein the cross-linked polyolefin elastomer has a melting temperature of greater than 80° C.

7. The composite tube in accordance with claim 1 , wherein the cross-linked polyolefin elastomer has a glass transition temperature (Tg) of less than 0° C.

8. The composite tube in accordance with claim 1 , wherein the flexural modulus is less than 8,000 psi.

9. The composite tube in accordance with claim 1 , wherein the elastomer of the second layer comprises a polystyrene, a polyester, a silicone copolymer, a silicone thermoplastic vulcanizate, a copolyester, a polyamide, a fluoropolymer, a polyethylene, a polypropylene, a polyether-ester copolymer, a thermoplastic urethane, a polyether amide block copolymer, a polyamide copolymer, a styrene block copolymer, a polycarbonate, a polyolefin elastomer, a diene elastomer, a thermoplastic vulcanizate, an ionomer, a polyoxymethylene (POM), an acrylonitrile butadiene styrene (ABS), an acetal, an acrylic, a polyvinyl chloride (PVC), or combination thereof.

10. The composite tube in accordance with claim 1 , wherein the first layer is in direct contact with the second layer.

11. The composite tube in accordance with claim 10 , comprising interlayer cross-linking between the first layer and the second layer.

12. The composite tube in accordance with claim 10 , wherein the first layer and the second layer have an adhesive strength of cohesive failure.

13. The composite tube in accordance with claim 1 , wherein the composite tube comprises an adhesive layer disposed between the first layer and the second layer.

14. The composite tube in accordance with claim 13 , wherein the adhesive layer comprises a polymer comprising a silane, an anhydride, an acrylate, an epoxy, a vinyl, or a hydride functionality.

15. The composite tube in accordance with claim 1 , wherein the composite tube is a chemically resistant peristaltic pump or transfer tube.

16. The composite tube in accordance with claim 1 , wherein the composite tube has a peristaltic flow rate that changes by less than about 30% over its useful life.

17. A method of forming a composite tube, comprising:
providing a first layer comprising a polyolefin elastomer, wherein the cross-linked polyolefin elastomer comprises a C2-C10 carbon-based elastomer;
providing a second layer comprising an elastomer overlying the first layer; and
crosslinking at least the first layer with a radiation source, a cross-linking agent, or combination thereof to substantially cross-link the polyolefin elastomer.

18. The method of forming the composite tube in accordance with claim 17 , wherein providing the first layer comprising the polyolefin elastomer comprises:
optionally mixing a cross-linking agent comprising a peroxide, an azo compound, a silane, or combination thereof with the polyolefin elastomer; and
extruding the polyolefin elastomer.

19. The method of forming the composite tube in accordance with claim 18 , wherein the polyolefin elastomer is cross-linked by thermal treatment at a temperature greater than 50° C.

20. The method of forming the composite tube in accordance with claim 17 , wherein the radiation source comprises e-beam irradiation, gamma irradiation, x-ray irradiation, or combination thereof.

Assignees

• Saint Gobain Performance Plastics Corp

Inventors

• Tzivanis Michael J
• Ludlow James

Classifications

• B32B27/40

  comprising polyurethanes · CPC title

• B32B27/365

  comprising polycarbonates · CPC title

• B32B27/34

  comprising polyamides · CPC title

• B32B27/36

  comprising polyesters · CPC title

• B32B27/283

  comprising polysiloxanes · CPC title