# US 4,758,450 A · Object coated with plastic and process for producing it

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- Number: US 4,758,450 A
- Document ID: US4758450A
- Status: Granted
- Kind: A
- Application number: 06/861,323
- Filed: 1986-05-09
- Granted: 1988-07-19
- Earliest claimed: 1985-05-14
- Assignees: Simro AG
- Inventors: Gunther Czech; Theodor Fessel
- Web page: https://patentgrep.com/patent/US4758450A

## CPC

- B05D 7/02: to macromolecular substances, e.g. rubber (treatment or coating of shaped articles made of macromolecular substances C08J7/00)
- B05D 1/24: Applying particulate materials
- B29D 12/02: Spectacle frames (constructional form G02C)
- B05D 3/0218: {Pretreatment, e.g. heating the substrate}
- B05D 3/0254: {After-treatment}
- B05D 2401/32: applied as powders
- B05D: PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL (conveying articles or workpieces through baths of liquid B65G, e.g. B65G49/02)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)

## Abstract

An object coated with plastic described, whereby the object consists of high-melting plastic onto which a coating is melted of plastic powder. The method is specifically concerned with coating spectacle frames with resin powder in a vortical sintering bath.

## Claims

### Claim 1

A process of coating a spectacle frame or part thereof composed of polyetherimide or polyethersulfone with a plastic powder comprising the steps of:
a. preheating the spectacle frame or part thereof to a temperature in the range of from 170.degree. C. to 230.degree. C.
b. immersing the preheated spectacle frame or part from 1 to 5 seconds in a vortical sintering bath of ethylenevinyl-alcohol-copolymer, polyether block amide, epoxide, polyamide or mixtures of these; and
c. removing the spectacle frame or part from the vortical sintering bath and allowing said spectacle frame or part to cool.

### Claim 2 (depends on 1)

The process of claim 1 wherein the high melting plastic is a polyetherimide which manifests the following repeating unit: ##STR3##

### Claim 3 (depends on 1)

The process of claim 1 wherein the high melting plastic is a polyethersulfone which manifests the following repeating unit: ##STR4##