Use of a laser-sensitive coating for the production of a laser-inscribable sheet of glass

• US 6,444,068 B1
• Filed: 04/26/1999
• Issued: 09/03/2002
• Est. Priority Date: 05/30/1998
• Status: Expired due to Term

• Current Assignee: Tesa SE (maxingvest GmbH & Co. KGaA)
• Original Assignee: Tesa AG (maxingvest GmbH & Co. KGaA)
• Inventors: Kreft, Christian, Koops, Arne, Pfaff, Ronald
• Primary Examiner(s): Ball, Michael W.
• Assistant Examiner(s): Haran, John T.
• Application Number:
  US09/299,170
• Time in Patent Office: 1,226 Days
• Field of Search: 156/99, 156/100, 156/272.2, 156/272.8, 156/278, 65/601, 65/301, 427/487, 427/508, 427/514, 427/553, 427/554, 430/363, 430/365, 430/945
• US Class Current: 156/99
• CPC Class Codes: B32B 17/10036 comprising two outer glass sheets
• CPC Class Codes: B32B 17/10247 Laminated safety glass or glazing containing decorations or patterns for aesthetic reasons containing metal wires for aesthetic reasons B32B17/10422
• CPC Class Codes: B32B 17/10917 between two pre-positioned glass layers
• CPC Class Codes: B41M 5/262 recording or marking of inorganic surfaces or materials, e.g. glass, metal, or ceramics marking of plastic artifacts with inorganic additives B41M5/267
• CPC Class Codes: B41M 5/267 Marking of plastic artifacts, e.g. with laser
• CPC Class Codes: B44F 1/06 produced by transmitted light, e.g. transparencies, imitations of glass paintings
• CPC Class Codes: B44F 1/066 comprising at least two transparent elements, e.g. sheets, layers layered products of glass and synthetic resin containing decorations or patterns B32B17/10247; window units comprising two or more parallel glass panes E06B3/66

Abstract

Method for the production of a laser-inscribable sheet of glass, wherein a laser-sensitive coating, comprising

a) a base polymer and

b) a radiation-sensitive additive which exhibits a color change on laser irradiation, is applied to at least part of a sheet of glass and hardened, and the sheet of glass is subsequently inscribed by means of a laser.

Claims

1. A method for the production of a laser-inscribable sheet of glass, comprising the steps of:

a) providing a laser-sensitive coating, comprising

i) a base polymer and

ii) a radiation-sensitive additive which exhibits a color change upon laser irradiation;

b) applying said coating in liquid form to at least part of a sheet of glass;

c) hardening said coating by radiation-chemical curing; and

subsequently

d) inscribing the coating by means of a laser.

2. Method according to claim 1, wherein the base polymer is selected from the group consisting of unsaturated polyesters, epoxy, polyester and urethane acrylates.

3,. Method according to claim 1, wherein the base polymer is mixed with coloring pigments, light stabilizers, heat stabilizers or processing aids.

3. Method according to claim 1, wherein the base polymer contains the radiation-sensitive additive at a concentration of from 0.001% by weight to 3% by weight.

4. Method according to claim 1, wherein the radiation-sensitive additive is a colored pigment or a metal salt.

5. Method according to claim 1, wherein the laser-sensitive coating is applied between two glass sheets and hardened.

6. Method according to claim 2 wherein said base polymer is an aliphatic polyurethane acrylate.

7. Method according to claim 5, wherein said radiation-sensitive additive is copper hydroxide phosphate or Iriondin®

pearl lustre pigment.

8. Process for the production of an inscribable multilayer glass, comprising the steps of, in order:

a) bonding two glass sheets to one another in such a way that a cavity remains between them,

b) filling the cavity present between the glass sheets with a coating material to such an extent that only a small partial region remains,

c) introducing into the partial region a laser-sensitive coating material comprising

i) a base polymer and

ii) a radiation-sensitive additive which exhibits a color change upon laser irradiation,

d) carrying out a radiation-chemical hardening of the coating, and

e) inscribing the multilayer glass by means of a laser.