Method for transferring an embossed structure to the surface of a coating means and compound structure usable as an embossing die

Patent metadata

Field	Value
Publication number	US-11865858-B2
Application number	US-201917042053-A
Country	US
Kind code	B2
Filing date	Mar 28, 2019
Priority date	Mar 28, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

The present disclosure relates to a method for transferring an embossed structure to a surface of a coating composition (B2a), which includes the steps (1-i) and (2-i) or (1-ii) and (2-ii) and also the steps (3) and optionally (4), where the steps (1-i) and (2-i) or (1-ii) and (2-ii) are performed using a composite (F1B1) which is employed as an embossing die (p2) of an embossing tool (P2) and which is composed of a substrate (F1) and of an at least partially embossed and at least partially cured coating (B1), and the coating composition (B1a) used for producing (B1) of the composite (F1B1) is a radiation-curable coating composition of defined constitution. Also described herein is a composite (F1B1).

First claim

What is claimed is:

1. A method for transferring an embossed structure to at least a part of a surface of a coating composition (B2a), the method comprising:
(1-i) applying a coating composition (B2a) to at least a part of a surface of a substrate (F2) and
(2-i) at least partially embossing the coating composition (B2a), applied at least partially to the surface of the substrate (F2), by means of at least one embossing tool (P2) comprising at least one embossing die (p2), where the embossing die (p2) comprises a composite (B1F1) composed of a substrate (F1) and of an at least partially embossed and at least partially cured coating (B1), to give a composite (F2B2aB1F1) after the at least partial embossing,
or
(1-ii) applying a coating composition (B2a) to at least a part of an at least partially embossed surface of a composite (B1F1) which is used as an embossing die (p2) of an embossing tool (P2) and which is composed of a substrate (F1) and of an at least partially embossed and at least partially cured coating (B1), to give a composite (B2aB1F1), and
(2-ii) applying a substrate (F2) to at least a part of the surface, formed by (B2a), of the composite (B2aB1F1), to give a composite (F2B2aB1F1), and
(3) at least partially curing the coating composition (B2a) within the composite (F2B2aB1F1), to give a composite (F2B2B1F1), where throughout a duration of the at least partial curing, the coating composition (B2a) is in contact with the composite (B1F1), used as embossing die (p2) within the composite (F2B2aB1F1), and
(4) optionally removing the composite (F2B2) within the composite (F2B2B1F1) from the composite (B1F1) used as the embossing die (p2),
where the coating composition (B1a) used for producing the coating (B1) of the composite (B1F1) used as the embossing die (p2) is a radiation-curable coating composition,
wherein the coating composition (B1a) comprises:
at least a component (a) in an amount in a range from 40 to 95 wt %,
at least an additive as component (b) in an amount in a range from 0.01 to 5 wt %,
at least a photoinitiator as component (c) in an amount in a range from 0.01 to 15 wt %, and
at least a component (d), comprising at least one carbon double bond, in an amount in a range from 0 to 45 wt %,
where (i) the components (a), (b), (c), and (d) are each different from one another, (ii) the stated amounts of the components (a), (b), (c), and (d) are each based on a total weight of the coating composition (B1a), and (iii) the amounts of all components present in the coating composition (B1a) add up to 100 wt %,
and where component (a) comprises at least three structural units, each different from one another or at least partially identical, of formula (I)

in which
radicals R 1 in each case independently of one another are a C 2 -C 8 alkylene group,
radicals R 2 in each case independently of one another are H or methyl, and
m each independently of one another are an integral parameter in a range from 1 to 15, but with proviso that m is at least 2 in at least one of the structural units of formula (I) within the component (a).

2. The method according to claim 1 , wherein the substrate (F2) is a moving film web.

3. The method according to claim 1 , wherein micro- and/or nanostructures are transferred as embossed structure to the coating composition (B2a) by step (2-i) or by steps (1-ii) and (2-ii).

4. The method according to claim 1 , wherein the embossing die (p2) of the embossing tool (P2) that is used in step (2-i) and (1-ii) is reusable and can be used repeatedly for transferring at least one embossed structure when step (4) of the method is carried out.

5. The method according to claim 1 , wherein the composite (B1F1) used as an embossing die (p2) in step (2-i) and (1-ii) is a composite composed of a film web (F1) and of a coating (B1) which is applied thereto and is at least partially embossed and at least partially cured.

6. The method according to claim 1 , wherein
during implementation of step (2-i), the composite (B1F1) used as embossing die (p2) in step (2-i) is guided via a first roll functioning as embossing tool (P2) and composite (F2B2a) is guided via a second roll, which lies opposite the first roll and is counter-rotatory thereto or co-rotatory therewith, and
following application of the coating composition (B2a) to at least a part of its at least partially embossed surface to give the composite (B2aB1F1), during implementation of step (2-ii), the composite (B1F1) used as embossing die (p2) in step (1-ii) is guided via a first roll functioning as embossing tool (P2), and the substrate (F2) used within step (2-ii) is guided via a second roll, which lies opposite to the first roll and is counter-rotatory thereto or co-rotatory therewith.

7. The method according to claim 6 , wherein
the at least partial embossing of step (2-i) takes place at a level of a roll nip which is formed by two mutually opposing rolls, rotating counter-directionally or in a same direction, where the at least partially embossed coating (B1) of the composite (B1F1) is facing the coating composition (B2a) of the composite (F2B2a), and
the at least partial embossing of step (2-ii) takes place at the level of the roll nip which is formed by the two mutually opposing rolls, rotating counter-directionally or in the same direction, where the coating composition (B2a) of the composite (B2aB1F1) is facing the substrate (F2).

8. The method according to claim 1 , wherein a solids content of the coating composition (B1a) is ≥90 wt %, based on the total weight of the coating composition (B1a).

9. The method according to claim 1 , wherein m is at least 2 in each of the at least three structural units of the formula (I) of component (a).

10. The method according to claim 1 , wherein a fraction of ether segments —[O—R 1 ] m — present in the structural units of formula (I) in the component (a) is at least 35 wt %, based on a total weight of component (a).

11. The method according to claim 1 , wherein the composite (F1B1) which is used as embossing die (p2) of the embossing tool (P2) and which is composed of a substrate (F1) and of an at least partially embossed and at least partially cured coating (B1) is at least obtainable by:
(5) applying the radiation-curable coating composition (B1a) to at least a part of a surface of a substrate (F1),
(6) at least partially embossing the radiation-curable coating composition (B1a), applied at least partially to the surface of the substrate (F1), by means of at least one embossing tool (P1) having at least one embossing die (p1),
(7) at least partially curing the radiation-curable coating composition (B1a), applied to at least a part of the surface of the substrate (F1) and at least partially embossed, by radiation curing, to give a composite (F1B1) composed of substrate (F1) and of at least partially embossed and at least partially cured coating (B1), where throughout the duration of the at least partial curing the coating composition (B1a) is in contact with the at least one embossing die (p1) of the at least one embossing tool (P1), and
(8) removing the composite (F1B1) from the embossing tool (P1).

12. A composite (F1B1) comprising:
a substrate (F1), and
an at least partially embossed and at least partially cured coating (B1), and which is producible by at least partially curing a coating composition (B1a), applied to at least a part of a surface of the substrate (F1) and at least partially embossed, by radiation curing, where the coating composition (B1a) is a

Assignees

• Basf Coatings Gmbh

Inventors

• Kues Jan-Bernd
• Piontek Susanne
• Exner Joerg
• Kleine-Bley Birgit
• Von Der Aa Robert
• Lorenz Michael
• Bergmann Frank
• Schipper Wilfried
• Krabbenborg Sven Olle
• Duennewald Joerg

Classifications

• B44B5/026 Primary

  Dies (B44B5/028 takes precedence) · CPC title

• B44C1/24

  Pressing or stamping ornamental designs on surfaces · CPC title

• B29C59/046

  for layered or coated substantially flat surfaces · CPC title

• B29C2035/0827

  using UV radiation · CPC title

• B29C2043/3483

  using band or film carriers · CPC title