Direct laser-engraveable patternable elements and uses
View Patent ↗A laser-engravable patternable element can be used to provide a relief image for various types of printing including flexographic printing. This laser-engraveable patternable element has a one laser-engravable layer that comprises a thermoplastic elastomeric interpolymer alloy that comprises a non-crosslinked halogenated polymer, a partially crosslinked polyolefin, and a polyester. A relief image can be obtained by directly laser-engraving the noted element under suitable conditions.
1. A laser-engravable patternable element for providing a relief image, the laser-engraveable patternable element comprising at least one laser-engravable layer that comprises a thermoplastic elastomeric interpolymer alloy that comprises:
a non-crosslinked halogenated polymer,
a partially crosslinked polyolefin,
a polyester, and
a near-infrared radiation absorber in an amount of at least 5 weight % and up to and including 30 weight %, based on the total dry laser-engraveable layer weight.
2. The laser-engraveable patternable element of claim 1 , wherein the non-crosslinked halogenated polymer is present in the laser-engraveable layer in an amount of at least 5 weight % and up to and including 75 weight %, based on the total dry weight of the laser-engraveable layer.
3. The laser-engraveable patternable element of claim 1 , wherein the partially crosslinked polyolefin is present in the laser-engraveable layer in an amount of at least 5 weight % and up to and including 90 weight %, based on the total dry weight of the laser-engraveable layer.
4. The laser-engraveable patternable element of claim 1 , wherein the polyester is present in the laser-engraveable layer in an amount of at least 5 weight % and up to and including 90 weight %, based on the total dry weight of the laser-engraveable layer.
5. The laser-engraveable patternable element of claim 1 , wherein the weight ratio of the non-crosslinked halogenated polymer to the partially crosslinked polyolefin in the laser-engraveable layer is at least 0.05:1 to and including 3:1.
6. The laser-engraveable patternable element of claim 1 , wherein the thermoplastic elastomeric interpolymer alloy has a softening temperature of less than or equal to 10° C.
7. The laser-engraveable patternable element of claim 1 , wherein the near-infrared radiation absorber is a carbon black, carbon nanotubes, an inorganic or organic pigment, an organic dye having at least one absorption peak wavelength of at least 700 nm and to and including 1400 nm, or a combination of any of these materials.
8. The laser-engraveable patternable element of claim 1 comprising two or more layers including at least one laser-engraveable layer.
9. The laser-engraveable patternable element of claim 1 further comprising a non-laser-engraveable layer that is contiguous to the laser-engraveable layer.
10. The laser-engraveable patternable element of claim 1 further comprising a substrate over which the laser-engraveable layer is disposed.
11. The laser-engraveable patternable element of claim 1 , wherein the laser-engraveable layer has a dry average thickness of at least 20 μm and up to and including 4,000 μm.
12. The laser-engraveable patternable element of claim 1 that is a flexographic printing precursor, gravure printing precursor, or intaglio printing precursor.
13. The laser-engraveable patternable element of claim 1 , wherein its uppermost surface has a relief pattern with a relief image that has a depth of less than 10 μm and a repeat length in both horizontal directions of less than 20 μm.
14. A directly laser-engraved patterned element having a relief image provided by direct laser-engraving, the directly laser-engraved patterned element comprising the relief image that has a depth of at least 10 μm in a directly laser-engraved layer comprising a thermoplastic elastomeric interpolymer alloy comprising:
a non-crosslinked halogenated polymer,
a partially crosslinked polyolefin,
a polyester, and
a near-infrared radiation absorber in an amount of at least 5 weight % and up to and including 30 weight % based on the total directly laser-engraved layer weight,
wherein the relief image in the directly laser-engraved layer comprises features that have an average line width of at least 1 μm and up to and including 10 mm with no melt edges.
15. A directly laser-engraved patterned element comprising a directly laser-engraved layer having a relief image, the directly laser-engraved layer comprising a recycled thermoplastic elastomeric interpolymer alloy comprising:
a non-crosslinked halogenated polymer,
a partially crosslinked polyolefin,
a polyester, and
a near-infrared radiation absorber in an amount of at least 5 weight % and up to and including 30 weight % based on the total directly laser-engraved layer weight,
wherein the relief image in the directly laser-engraved layer comprises features that have an average line width of at least 1 μm and up to and including 1 mm with no melt edges.