Fastener retention material and method

Patent metadata

Field	Value
Publication number	US-11274693-B2
Application number	US-201716333016-A
Country	US
Kind code	B2
Filing date	Sep 12, 2017
Priority date	Sep 15, 2016
Publication date	Mar 15, 2022
Grant date	Mar 15, 2022

Abstract

The present disclosure concerns a powder fastener retention material for application to metal sub-miniature fasteners formulated from a nylon 11 powder having a median average particle size by volume of more than 67 and less than 80 micrometers, a metal sub-miniature fastener having a patch of the reusable fastener retention material, a method for forming a patch of the fastener retention material on a metal sub-miniature fastener, a method of forming a reusable fastener retention patch on a region of a metal sub-miniature fastener, and a kit of parts comprising (a) a metal sub-miniature fastener, and (b) a powder retention material powder.

First claim

The invention claimed is:

1. A powder fastener retention material for application to metal sub-miniature fasteners, wherein such sub-miniature fasteners are threaded fasteners having a diameter from furthest points on the thread of less than about 1.1 mm, comprising a nylon 11 powder having a median average particle size by volume of between 67 and 73 micrometers, and further comprising up to 20 wt % of a density control additive, up to 40 wt % of an adhesion promoter, and up to 2 wt % a flow promoter, wherein wt % is based on the total weight of the powder fastener retention material.

2. The powder fastener retention material of claim 1 wherein at least 60% by volume of the nylon 11 particles have a particle size of between 30 and 100 micrometers.

3. The powder fastener retention material of claim 1 , wherein the density control additive comprises limestone.

4. The powder fastener retention material of claim 1 , wherein the adhesion promoter comprises a phenol-functional compound and/or an epoxy functional compound.

5. The powder fastener retention material of claim 1 , wherein the flow promoter comprises silica.

6. A metal sub-miniature fastener comprising a patch prepared from a powder fastener retention material comprising a nylon 11 powder having a median average particle size by volume of between 67 and 73 micrometers, wherein such a sub-miniature fastener is a threaded fastener having a diameter from furthest points on the thread of less than about 1.1 mm.

7. The metal sub-miniature fastener of claim 6 wherein at least 60% by volume of the nylon 11 particles have a particle size of between 30 and 100 micrometers.

8. The metal sub-miniature fastener of claim 6 , wherein the powder fastener retention material further comprises up to 20 wt % of a density control additive, up to 40 wt % of an adhesion promoter, and up to 2 wt % a flow promoter, wherein wt % is based on the total weight of the powder fastener retention material.

9. The metal sub-miniature fastener of claim 8 , wherein the density control additive comprises limestone.

10. The metal sub-miniature fastener of claim 8 , wherein the adhesion promoter comprises a phenol-functional compound and/or an epoxy functional compound.

11. The metal sub-miniature fastener of claim 8 , wherein the flow promoter comprises silica.

12. A method for forming a patch of fastener retention material on a metal sub-miniature fastener, comprising:
(a) applying to at least one region of the metal sub-miniature fastener a powder retention material in a gaseous stream, wherein such sub-miniature fasteners are threaded fasteners having a diameter from furthest points on the thread of less than about 1.1 mm, and
(b) melting the powder retention material on the metal sub-miniature fastener, wherein the powder retention material comprises a nylon 11 powder having a median average particle size by volume of between 67 and 73 micrometers, and further comprising up to 20 wt % of a density control additive, up to 40 wt % of an adhesion promoter, and up to 2 wt % a flow promoter, wherein wt % is based on the total weight of the powder retention material.

13. The method of claim 12 further comprising a step of preheating the metal sub-miniature fastener prior to application of the powder retention material to the metal sub-miniature fastener, and/or a step of post-heating the metal sub-miniature fastener after application of the powder retention material to the metal sub-miniature fastener.

14. The method of claim 12 wherein at least 60% by volume of the nylon 11 particles have a particle size of between 30 and 100 micrometers.

15. Use of a powder fastener retention material for forming a reusable fastener retention patch on a region of a metal sub-miniature fastener, wherein such sub-miniature fasteners are threaded fasteners having a diameter from furthest points on the thread of less than about 1.1 mm, wherein the powder fastener retention material comprises a nylon 11 powder having a median average particle size by volume of between 67 and 73 micrometers, and further comprising up to 20 wt % of a density control additive, up to 40 wt % of an adhesion promoter, and up to 2 wt % a flow promoter, wherein wt % is based on the total weight of the powder fastener retention material.

16. A kit of parts comprising:
(a) a metal sub-miniature fastener, wherein such sub-miniature fasteners are threaded fasteners having a diameter from furthest points on the thread of less than about 1.1 mm and
(b) a powder retention material comprising a nylon 11 powder having a median average particle size by volume of between 67 and 73 micrometers, and further comprising up to 20 wt % of a density control additive, up to 40 wt % of an adhesion promoter, and up to 2 wt % a flow promoter, wherein wt % is based on the total weight of the powder retention material.

Assignees

• Akzo Nobel Coatings Int Bv
• Nylok Llc

Inventors

• Alaimo Gregory
• Gradozzi Dominic J

Classifications

• C08K2003/265

  Calcium, strontium or barium carbonate · CPC title

• C08K3/36 Primary

  Silica · CPC title

• C08K3/26 Primary

  Carbonates; Bicarbonates · CPC title

• C09D177/04

  Polyamides derived from alpha-amino carboxylic acids (C09D177/10 takes precedence) · CPC title

• C08L2205/18

  Spheres · CPC title