Heat resistant paper-feel overprint varnishes

Patent metadata

Field	Value
Publication number	US-12110417-B2
Application number	US-201917296397-A
Country	US
Kind code	B2
Filing date	Dec 11, 2019
Priority date	Dec 11, 2018
Publication date	Oct 8, 2024
Grant date	Oct 8, 2024

Abstract

Described herein are heat resistant inks and coating compositions that, when coated on a substrate, impart the feel of paper. The inks and coating compositions do not degrade when exposed to temperatures of 120° C. or greater.

First claim

What is claimed is:

1. A heat resistant ink or coating composition comprising resin, solvent and a heat resistant material comprising nylon particles, characterized in that application of the ink or coating composition on a plastic substrate, imparts the plastic substrate a feel of paper, wherein:
the nylon particles have a mean particle size of 30 μm to 100 μm;
a feel of paper is the haptic effect or tactile perception of touching and feeling paper;
the heat resistant material is not soluble in the resin and solvent;
the ink or coating composition does not degrade upon exposure to temperatures of 120° C. or greater; and
the feel of paper imparted by the coating is maintained after heat sealing or printing at temperatures greater than 120° C.

2. The heat resistant ink or coating composition of claim 1 , wherein the ink or coating composition does not degrade upon exposure to temperatures of 120° C. to at least 267° C.

3. The heat resistant ink or coating composition of claim 1 , wherein the heat resistant material comprises particles of nylon selected from nylon 6 particles, nylon 66 particles, nylon 610 particles, nylon 612 particles, and combinations thereof.

4. The heat resistant ink or coating composition of claim 1 , wherein the nylon particles have a maximum particle size of 75 μm to 100 μm.

5. The heat resistant ink or coating composition of claim 4 , wherein the heat resistant material comprises nylon particles having a mean particle size of 30 μm to 75 μm.

6. The heat resistant ink or coating composition of claim 1 , wherein the heat resistant material comprises nylon particles having a melting point of 200° C. to 267° C.

7. The heat resistant ink or coating composition of claim 1 , wherein the resin is present in the composition in an amount of 1.0 wt % to 60 wt %.

8. The heat resistant ink or coating composition of claim 1 , wherein the solvent is present in the composition in an amount of 5.0 wt % to 70 wt %.

9. The heat resistant ink or coating composition of claim 1 , wherein the heat resistant material is present in the composition in an amount of 0.1 wt % to 20 wt %.

10. The heat resistant ink or coating composition of claim 1 , further comprising an additive; and/or further comprising a colorant.

11. The heat resistant ink or coating composition of claim 1 , wherein the composition achieves the following results upon application to a substrate:
a Sutherland rub test score of 1 to 5; and/or
a contrast ratio of 1.0% to 15%; and/or
a gloss of 5-15 as measured on a 60° gloss meter.

12. The heat resistant ink or coating composition of claim 1 , wherein the heat resistant ink or coating composition exhibits a viscosity of 33 seconds to 37 seconds as measured in a #2 EZ Zahn cup at 22° C.

13. A coated substrate comprising the coating composition of claim 1 applied to the substrate.

14. The coated substrate of claim 13 , wherein the substrate is a plastic material selected from polyethylene terephthalate, nylon, cellophane, polypropylene, and glycine.

15. The coated substrate of claim 13 , wherein the coated substrate exhibits a gloss of 5-15 when measured on a 60° gloss meter; and/or wherein the coated substrate exhibits a Sutherland rub test score of 1 to 5; and/or wherein the coated substrate exhibits a contrast ratio of 1.0% to 15%.

16. The coated substrate of claim 15 , wherein the heat resistant ink or coating composition is applied to a substrate at a coating weight of 0.65 to 4.88 grams/meter 2 .

17. A heat stamp foil comprising the heat resistant ink or coating composition of claim 1 applied to a foil substrate.

18. A method of coating a substrate with a heat resistant ink or coating comprising:
applying to a plastic substrate, at a temperature of 120° C. or greater, a heat resistant ink or coating composition comprising resin, solvent and heat resistant nylon particles, wherein the nylon particles have a mean particle size of 30 μm to 100 μm, wherein the ink or coating provides heat resistance at temperatures of 120° C. or greater, and wherein the heat resistant material is not soluble in the resin and solvent; and
drying the coating;
wherein the ink or coating composition imparts a feel of paper to the substrate, wherein a feel of paper is the haptic effect or tactile perception of touching and feeling paper, and wherein the paper feel imparted by the coating is maintained after heat sealing or printing at temperatures greater than 120° C.

19. The method of claim 18 , wherein the ink or coating provides heat resistance at temperatures of 120° C. to at least 267° C.

Assignees

• Sun Chemical Corp

Inventors

• Boyd Craig
• Majewski David

Classifications

• D21H19/66

  Coatings characterised by a special visual effect, e.g. patterned, textured (marbled paper D21H27/04) · CPC title

• D21H19/62

  Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds · CPC title

• D21H19/52

  Cellulose; Derivatives thereof · CPC title

• C09D175/04

  Polyurethanes · CPC title

• C09D171/00

  Coating compositions based on polyethers obtained by reactions forming an ether link in the main chain (based on polyacetals C09D159/00; based on epoxy resins C09D163/00; based on polythioether-ethers C09D181/02; based on polyethersulfones C09D181/06); Coating compositions based on derivatives of such polymers · CPC title