Liquid crystal polymer for mounting x-ray window

Patent metadata

Field	Value
Publication number	US-11967481-B2
Application number	US-202217671861-A
Country	US
Kind code	B2
Filing date	Feb 15, 2022
Priority date	Jul 6, 2018
Publication date	Apr 23, 2024
Grant date	Apr 23, 2024

Abstract

An x-ray window can include an adhesive layer sandwiched between and providing a hermetic seal between a thin film and a housing. The adhesive layer can include liquid crystal polymer. The liquid crystal polymer can be opaque, gas-tight, made of low atomic number elements, able to withstand high temperature, low outgassing, low leakage, able to relieve stress in the x-ray window thin film, capable of bonding to many different materials, or combinations thereof.

First claim

What is claimed is:

1. A method of making an x-ray window, the method comprising:
placing a liquid crystal polymer between a thin film and a housing, the liquid crystal polymer includes an aromatic polyester;
pressing the thin film and the housing towards each other and towards the liquid crystal polymer sandwiched between them; and
heating the x-ray window to a temperature of ≥250° C. and ≤500° C.; and
wherein heating the x-ray window includes maintaining the x-ray window at the temperature for a time of ≥30 minutes and ≤6 hours.

2. The method of claim 1 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa and ≤50 KPa.

3. The method of claim 1 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa.

4. The method of claim 1 , wherein heating the x-ray window includes heating to a temperature above a melting point of the liquid crystal polymer.

5. The method of claim 1 , wherein heating the x-ray window includes heating to a temperature above a glass transition temperature of the liquid crystal polymer.

6. The method of claim 1 , wherein the liquid crystal polymer is thermotropic.

7. A method of making an x-ray window, the method comprising:
placing a liquid crystal polymer between a thin film and a housing, the liquid crystal polymer includes an aromatic polyester;
pressing the thin film and the housing towards each other and towards the liquid crystal polymer sandwiched between them; and
wherein weight loss of the liquid crystal polymer, prior to placing the liquid crystal polymer between the thin film and the housing, is ≤1% at a temperature of 225° C. during a 24 hour period.

8. The method of claim 7 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa and ≤50 KPa.

9. The method of claim 7 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa.

10. The method of claim 7 , wherein the liquid crystal polymer is thermotropic.

11. A method of making an x-ray window, the method comprising:
placing a liquid crystal polymer between a thin film and a housing, the liquid crystal polymer being thermotropic;
pressing the thin film and the housing towards each other and towards the liquid crystal polymer sandwiched between them; and

heating the x-ray window; and
wherein weight loss of the liquid crystal polymer, prior to placing the liquid crystal polymer between the thin film and the housing, is ≤1% at a temperature of 225° C. during a 24 hour period.

12. The method of claim 11 , wherein the liquid crystal polymer includes an aromatic polyester.

13. The method of claim 11 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa and ≤50 KPa.

14. The method of claim 11 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa.

15. A method of making an x-ray window, the method comprising:
placing a liquid crystal polymer between a thin film and a housing, the liquid crystal polymer being thermotropic;
pressing the thin film and the housing towards each other and towards the liquid crystal polymer sandwiched between them; and
heating the x-ray window to a temperature of ≥250° C. and ≤500° C.; and
wherein heating the x-ray window includes maintaining the x-ray window at the temperature for a time of ≥30 minutes and ≤6 hours.

16. The method of claim 15 , wherein heating the x-ray window includes heating to a temperature above a melting point of the liquid crystal polymer.

17. The method of claim 15 , wherein heating the x-ray window includes heating to a temperature above a glass transition temperature of the liquid crystal polymer.

18. The method of claim 15 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa and ≤50 KPa.

19. The method of claim 15 , wherein the thin film and the housing are pressed towards each other and towards the liquid crystal polymer with a pressure of ≥1 KPa.

20. The method of claim 15 , wherein the liquid crystal polymer includes an aromatic polyester.

Assignees

• Moxtek Inc

Inventors

• Sommer Jared
• Abbott Jonathan

Classifications

• H01J35/18 Primary

  Windows · CPC title

• C09J161/00

  Adhesives based on condensation polymers of aldehydes or ketones (with polyalcohols C09J159/00; with polynitriles C09J177/00); Adhesives based on derivatives of such polymers · CPC title

• C09J167/00

  Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain (based on polyester-amides C09J177/12; based on polyester-imides C09J179/08); Adhesives based on derivatives of such polymers · CPC title

• G01T1/16

  Measuring radiation intensity (G01T1/29 takes precedence {; self-powered detectors G01T3/006; using an ionisation chamber filled with a liquid or solid, e.g. frozen liquid, dielectric G01T3/008}) · CPC title

• H01J5/18

  Windows permeable to X-rays, gamma-rays, or particles · CPC title