IP Library › Granted Patent US 7,456,238
Granted Patent B2
US 7,456,238 · App. 11/044,930 · Granted Nov 25, 2008

Fabricated resin products for laser welding and including transmitting and absorbing black colorants, and colored resin compositions therefor

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Quick Facts
Patent No.
US 7,456,238
App. No.
11/044,930
Granted
Nov 25, 2008
Kind
B2
Abstract

Novel fabricated resin products are described and having suitability for laser welding applications. These contain a resin part for transmitting black colorant and a resin part for absorbing black colorant.

Claims (5)

1. A method of laser welding, comprising the steps of:

preparing a first molded article comprising a thermoplastic, the first molded article being transparent to a laser beam used for laser welding;

preparing a second molded article comprising a thermoplastic resin and a laser beam absorbing black colorant, the second molded article having a transmission rate ratio (T black resin for laser transmission /T natutal resin ) of 0-0.2 wherein T black resin for laser transmission means the transmission rate of the second molded article and T natural resin means the transmission rate of the thermoplastic resin alone for the laser beam, the laser beam absorbing black colorant comprising a carbon black and a nigrosine dye;

positioning the first molded article and the second molded article in contact with each other; and

transmitting a laser beam energy focused on the area of contact through the first molded article to the second molded article.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jun 26, 2019
From: E. I. DU PONT DE NEMOURS AND COMPANY
To: DUPONT POLYMERS, INC.
Reel/Frame 049590/0650 →