Liquid crystal polymer for mounting x-ray window

Patent metadata

Field	Value
Publication number	US-11295924-B2
Application number	US-202117210299-A
Country	US
Kind code	B2
Filing date	Mar 23, 2021
Priority date	Jul 6, 2018
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

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. An x-ray window comprising:
a thin film configured for transmission of x-rays;
a housing;
an adhesive layer sandwiched between and providing a hermetic seal between the thin film and the housing, the adhesive layer including a thermotropic liquid crystal polymer; and
the liquid crystal polymer includes 6-hydroxy-2-naphthaldehyde.

2. The x-ray window of claim 1 , wherein the liquid crystal polymer includes 4,4′-biphenol.

3. The x-ray window of claim 1 , wherein:
the adhesive layer is a proximal adhesive layer, the x-ray window further comprising a distal adhesive layer;
the distal adhesive layer comprises liquid crystal polymer; and
the thin film is sandwiched between the proximal adhesive layer and the distal adhesive layer.

4. The x-ray window of claim 1 , further comprising:
a ribbed support structure sandwiched between the thin film and the adhesive layer;
the thin film and the ribbed support structure extending across an aperture of the housing;
the ribbed support structure provides structural support to the thin film across the aperture; and
viscosity of the liquid crystal polymer is ≥100,000 cps at 300° C.

5. The x-ray window of claim 1 , wherein:
≥80% of atoms in the adhesive layer have an atomic number ≤6; and
≥95% of the atoms in the adhesive layer have an atomic number ≤8.

6. The x-ray window of claim 1 , wherein:
the housing has a flange encircling an aperture;
the adhesive layer is located on the flange and has an annular shape encircling the aperture;
1 mm≤W 14 ≤15 mm where W 14 is a width of the adhesive layer on the flange; and
a thickness of the adhesive layer between the thin film and the housing is ≥10 μm and ≤500 μm.

7. The x-ray window of claim 3 , further comprising:
a ring located at an opposite side of the distal adhesive layer from the thin film, the ring being metallic; and
the proximal adhesive layer, the thin film, and the distal adhesive layer sandwiched between the ring and the housing.

8. An x-ray window comprising:
a thin film configured for transmission of x-rays;
a housing;
an adhesive layer sandwiched between and providing a hermetic seal between the thin film and the housing, the adhesive layer including a thermotropic liquid crystal polymer; and
the liquid crystal polymer includes ethane-1,2-diol.

9. The x-ray window of claim 8 , wherein the liquid crystal polymer includes 6-hydroxy-2-naphthaldehyde.

10. An x-ray window comprising:
a thin film configured for transmission of x-rays;
a housing;
an adhesive layer sandwiched between and providing a hermetic seal between the thin film and the housing, the adhesive layer including liquid crystal polymer, the liquid crystal polymer includes an aromatic polyester; and
the liquid crystal polymer includes 4,4′-biphenol.

11. The x-ray window of claim 10 , wherein the liquid crystal polymer includes ethane-1,2-diol.

12. The x-ray window of claim 10 , wherein:
the adhesive layer is a proximal adhesive layer, the x-ray window further comprising a distal adhesive layer;
the distal adhesive layer comprises liquid crystal polymer; and
the thin film is sandwiched between the proximal adhesive layer and the distal adhesive layer.

13. The x-ray window of claim 10 , wherein the liquid crystal polymer further comprises terephthalaldehyde.

14. The x-ray window of claim 12 , further comprising:
a ring located at an opposite side of the distal adhesive layer from the thin film, the ring being metallic; and
the proximal adhesive layer, the thin film, and the distal adhesive layer sandwiched between the ring and the housing.

15. An x-ray window comprising:
a thin film configured for transmission of x-rays;
a housing; and
an adhesive layer sandwiched between and providing a hermetic seal between the thin film and the housing, the adhesive layer including liquid crystal polymer, the liquid crystal polymer comprises 4-hydroxybenzaldehyde.

16. The x-ray window of claim 15 , wherein the liquid crystal polymer further comprises 4,4′-biphenol.

17. The x-ray window of claim 15 , wherein the liquid crystal polymer further comprises ethane-1,2-diol.

18. The x-ray window of claim 15 , wherein:
the adhesive layer is a proximal adhesive layer, the x-ray window further comprising a distal adhesive layer;
the distal adhesive layer comprises liquid crystal polymer; and
the thin film is sandwiched between the proximal adhesive layer and the distal adhesive layer.

19. The x-ray window of claim 15 , wherein the liquid crystal polymer further comprises terephthalaldehyde.

20. The x-ray window of claim 18 , further comprising:
a ring located at an opposite side of the distal adhesive layer from the thin film, the ring being metallic; and
the proximal adhesive layer, the thin film, and the distal adhesive layer sandwiched between the ring and the housing.

Assignees

• Moxtek Inc

Inventors

• Sommer Jared
• Abbott Jonathan

Classifications

• H01J2235/183

  Multi-layer structures · CPC title

• H01J35/18 Primary

  Windows · 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

• H01J5/18

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