Near infrared (nir) laser processing

Patent metadata

Field	Value
Publication number	US-2021016588-A1
Application number	US-201816768726-A
Country	US
Kind code	A1
Filing date	Nov 30, 2018
Priority date	Dec 8, 2017
Publication date	Jan 21, 2021
Grant date	—

Abstract

A method of near infrared (NIR) laser processing a resin based article includes the steps of applying a composition including a specific optothermal converting agent on a surface of the article, and exposing at least part of the applied optothermal converting agent with a NIR laser. The specific optothermal converting has an improved stability towards the environment and therefore renders the laser processing method more reliable.

First claim

1 - 15 . (canceled)

16 : A method of near infrared laser processing a resin based article, the method comprising:
exposing at least a portion of an optothermal converting agent applied on a surface of the resin based article, the optothermal converting agent including a near infrared absorbing compound having a chemical structure according to Formula I:

wherein
X is O or S;
R 1 and R 2 represent atoms necessary to form a substituted or unsubstituted 5 or 6 membered ring;
R 3 and R 5 are independently selected from the group consisting of an unsubstituted alkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aralkyl group, an unsubstituted alkaryl group, and a substituted or unsubstituted (hetero)aryl group;
R 4 is selected from the group consisting of a hydrogen, an unsubstituted alkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aralkyl group, an unsubstituted alkaryl group, a substituted or an unsubstituted (hetero)aryl group, a halogen, an unsubstituted alkoxy group, a substituted or an unsubstituted aryloxy group, a substituted or an unsubstituted heteroaryloxy group, an ester, an amine, an amide, a nitro, a thioalkyl group, a substituted or an unsubstituted thioaryl group, a substituted or an unsubstituted thioheteroaryl group, a carbamate, an ureum, a sulfonamide, a sulfoxide, and a sulfone; and
all hydrocarbon groups in Formula I are straight chain hydrocarbon groups.

17 : The method according to claim 16 , wherein the laser processing is selected from the group consisting of laser cutting, laser perforating, and laser welding.

18 : The method according to claim 16 , wherein the optothermal converting agent is imagewise applied onto the surface of the resin based article.

19 : The method according to claim 18 , wherein the optothermal converting agent is imagewise applied onto the surface of the resin based article by a printing method selected from the group consisting of intaglio printing, screen printing, flexographic printing, offset printing, inkjet printing, tampon printing, valve jet printing, and gravure offset printing.

20 : The method according to claim 19 , wherein the optothermal converting agent is applied by inkjet printing.

21 : The method according to claim 16 , wherein the optothermal converting agent is applied in a pattern including continuous lines, a series of spots, or a combination thereof.

22 : The method according to claim 16 , wherein the resin based article includes a polymer selected from the group consisting of a polyester, a polyamide, and a polyolefin.

23 : The method according to claim 16 , wherein the resin based article includes a thermoplastic polymer.

24 : The method according to claim 23 , wherein the thermoplastic polymer is selected from the group consisting of polyethylene, polypropylene, polyethylene terephthalate, and polyethylene 2, 5-furandicarboxylate.

25 : The method according to claim 16 , wherein the resin based article includes a foil.

26 : The method according to claim 25 , wherein the foil is wrapped around packaging.

27 : The method according to claim 26 , wherein the foil is transparent.

28 : The method according to claim 16 , wherein the optothermal converting agent has a chemical structure according to Formula II:

wherein
X is O or S;
R 8 and R 10 are independently selected from the group consisting of an unsubstituted alkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aralkyl group, an unsubstituted alkaryl group, and a substituted or unsubstituted (hetero)aryl group; and
R 9 is selected from the group consisting of a hydrogen, an unsubstituted alkyl group, an unsubstituted alkenyl group, an unsubstituted alkynyl group, an unsubstituted aralkyl group, an unsubstituted alkaryl group, a substituted or an unsubstituted (hetero)aryl group, a halogen, an unsubstituted alkoxy group, a substituted or an unsubstituted aryloxy group, a substituted or an unsubstituted heteroaryloxy group, an ester, an amine, an amide, a nitro, a thioalkyl group, a substituted or an unsubstituted thioaryl group, a substituted or an unsubstituted thioheteroaryl group, a carbamate, an ureum, a sulfonamide, a sulfoxide, and a sulfone.

29 : The method according to claim 28 , wherein R 9 is selected from the group consisting of a hydrogen, a chlorine, a bromine, a methyl, an ethyl, a methoxy group, an ethoxy group, a n-propoxy group, and a n-butoxy group.

30 : A packaging comprising:
the foil obtained by the method according to claim 26 .

Assignees

• Agfa Nv
• Agfa Gevaert Nv

Inventors

• Lazreg Faima
• Loccufier Johan
• Venneman Jan
• Desmet Tim

Classifications

• C08F10/06 Primary

  Propene · CPC title

• B29C66/71

  characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125) · CPC title

• B29C65/1683

  coated on the article · CPC title

• B29C65/1635

  at least passing through one of the parts to be joined, i.e. laser transmission welding · CPC title

• B29C65/1616

  Near infrared radiation [NIR], e.g. by YAG lasers · CPC title