US 12,173,766 B2 · Highly durable spring and method of coating the same

Abstract

A highly durable spring of the present invention includes a single-layer coating film with a thickness of 450 μm or less, in which the coating film contains an epoxy resin, a phenolic resin, and zinc. The coating film has high corrosion resistance and chipping resistance even if it is a one thin layer with a thickness of 450 μm or less. A method of coating a highly durable spring of the present invention includes an application process in which an epoxy resin-based powder coating material which contains an epoxy resin, a phenolic resin, and zinc and is produced by a melt kneading method is applied to a surface of a spring on which a coating-film is formed and a baking process in which the applied epoxy resin-based powder coating material is baked.

Claims13

Dependent claims

A highly durable spring consisting of:

a spring;
and
a single-layer coating film with a thickness that is in a range of from 200 μm or more and 450 μm or less,
wherein
the single-layer coating film is on the spring,
the single-layer coating film consists essentially of an epoxy resin, a phenolic resin, and zinc, the zinc having an average particle size of 2 μm to 15 μm and being in a spherical shape,
the single-layer coating film does not contain a softener or a fibrous filler, and
a content of the zinc is 10 mass % or more and 70 mass % or less when the mass of the entire single-layer coating film is set as 100 mass %.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application

16/087,873Filed 8 Mar 2017

Priority

JP 2016-06112025 Mar 2016

Published

US 2019/0107165 A111 Apr 2019

Granted

24 Dec 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification26 codes

F16F 1/021
Made of steel or other material having low internal friction ; Wound, torsion, leaf, cup, ring or the like springs, the material of the spring…
B05D 1/06
Involving the use of an electrostatic field: applying particulate materials
C08G 59/621
Alcohols or phenols: phenols
C09D 5/03
Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced ; Filling pastes: powdery…

Highly durable spring and method of coating the same

Life of this patent

Highly durable spring and method of coating the same

Life of this patent

Abstract

Claims13