Release liner having friction coating, laminate, and methods for manufacturing and using
View Patent ↗A release liner is provided according to the present invention. The release liner includes a clay coated paper substrate having a first surface and a second surface, a silicone coating provided on one of the first surface or the second surface of the clay coated paper substrate, and a friction coating provided on the other of the first surface of the second surface of the clay coated paper substrate. The clay coated paper substrate includes a paper base sheet having a first side, a second side, and a basis weight of about 50 lb/3,000 ft 2 to about 100 lb/3,000 ft 2 , and a clay coating on each of the paper base sheet first side and second side at a weight of about 0.75 lb/3,000 ft 2 to about 10 lb/3,000 ft 2 per side. Laminates including a release liner and an adhesive backed article are described, and additionally described are methods for manufacturing and using.
1. A release liner comprising:
(a) a clay coated paper substrate having a first surface and a second surface, the clay coated paper substrate comprising a paper base sheet having a first side, a second side, and a basis weight of about 50 lb/3,000 ft 2 to about 100 lb/3,000 ft 2 , and a clay coating on each of the paper base sheet first side and second side at a weight of about 0.75 lb/3,000 ft 2 to about 10 lb/3,000 ft 2 per side;
(b) a silicone coating provided on one of the first surface or the second surface of the clay coated paper substrate to provide a release layer having release properties; and
(c) a friction coating provided on the other of the first surface or the second surface of the clay coated paper substrate to provide a friction surface, wherein the friction coating comprises a mineral component having a diameter of about 0.25 microns to about 3 microns and a binder, wherein the weight ratio of the mineral component to the binder is about 1:4 to about 8:1.
2. A release liner according to claim 1 wherein the mineral component comprises at least one of calcium carbonate, calcite, quartz, titanium dioxide, iron (II) oxide, iron (III) oxide (hematite), cadmium sulfide, cadmium selenide, chromite, cobalt aluminate, zinc oxide, and mixtures thereof.
3. A release liner according to claim 1 wherein the paper base sheet has a basis weight of about 75 lb/3,000 ft 2 to about 95 lb/3,000 ft 2 .
4. A release liner according to claim 1 wherein the clay coated paper substrate has a caliper thickness of about 2.5 mil to about 10 mil.
5. A release liner according to claim 1 wherein the clay coated paper substrate has a clay coating on each side of the paper base sheet at a weight of about 0.8 lb/3,000 ft 2 to about 4 lb/3,000 ft 2 .
6. A release liner according to claim 1 , wherein the friction coating has a coat weight of about 0.5 lb/3,000 ft 2 to about 5 lb/3,000 ft 2 .
7. A release liner according to claim 1 wherein the friction coating comprises a mineral component having a diameter of about 0.5 microns to about 2 microns.
8. A release liner according to claim 1 wherein the friction coating comprises a mineral component having a diameter of about 0.7 microns to about 1.5 microns.
9. A release liner according to claim 1 wherein the mineral component has a hardness of at least 2 according to the MOHS Scale of Mineral Hardness.
10. A release liner according to claim 1 , wherein the friction coating has a coat weight of about 0.75 lb/3,000 ft 2 to about 2 lb/3,000 ft 2 .
11. A release liner according to claim 1 , wherein the friction coating provides a coefficient of friction greater than a coefficient of friction of the clay coated paper substrate without the friction coating provided thereon.
12. A laminate comprising a release liner and an adhesive backed article wherein:
(a) the release liner comprises:
(i) a clay coated paper substrate having a first surface and a second surface, the substrate comprising a paper base sheet having a first side, a second side, and a basis weight of about 50 lb/3,000 ft 2 to about 100 lb/3,000 ft 2 , and a clay coat on each of the paper base sheet first side and second side at a weight of about 0.75 lb/3,000 ft 2 to about 10 lb/3,000 ft 2 per side;
(ii) a silicone coating provided on one of the first surface or the second surface of the clay coated paper substrate to provide a release layer having release properties; and
(iii) a friction coating provided on the other of the first surface or the second surface of the clay coated paper substrate to provide a friction surface, wherein the friction coating comprises a mineral component having a diameter of about 0.25 microns to about 3 microns and a binder, wherein the weight ratio of the mineral component to the binder is about 1:4 to about 8:1; and
(b) the adhesive backed article comprising a substrate and adhesive provided on the substrate, wherein the adhesive on the adhesive backed article and the release layer on the release liner are in contact.
13. A laminate according to claim 12 wherein the mineral component comprises at least one of calcium carbonate, calcite, quartz, titanium dioxide, iron (II) oxide, iron (III) oxide (hematite), cadmium sulfide, cadmium selenide, chromite, cobalt aluminate, zinc oxide, and mixtures thereof.
14. A laminate according to claim 12 wherein the paper base sheet has a basis weight of about 75 lb/3,000 ft 2 to about 95 lb/3,000 ft 2 .
15. A laminate according to claim 12 wherein the clay coated paper substrate has a caliper thickness of about 2.5 mil to about 10 mil.
16. A laminate according to claim 12 wherein the clay coated paper substrate has a clay coating on each side of the paper base sheet at a weight of about 0.8 lb/3,000 ft 2 to about 4 lb/3,000 ft 2 .
17. A laminate according to claim 12 , wherein the friction coating has a coat weight of about 0.5 lb/3,000 ft 2 to about 5 lb/3,000 ft 2 .
18. A laminate according to claim 12 wherein the friction coating comprises a mineral component having a diameter of about 0.5 microns to about 2 microns.
19. A laminate according to claim 12 wherein the friction coating comprises a mineral component having a diameter of about 0.7 microns to about 1.5 microns.
20. A laminate according to claim 12 , wherein the mineral component has a hardness of at least 2 according to the MOHS Scale of Mineral Hardness.
21. A laminate according to claim 12 , wherein the friction coating has a coat weight of about 0.75 lb/3,000 ft 2 to about 2 lb/3,000 ft 2 .
22. A laminate according to claim 12 , wherein the friction coating provides a coefficient of friction greater than a coefficient of friction of the clay coated paper substrate without the friction coating provided thereon.