Coated release liner substrate
View Patent ↗Release liner substrates and release liners produced therefrom wherein the substrate includes a coating layer containing a binder and a hyperplatey talc. The release liner may comprise a release liner substrate with a binder and a hyperplatey talc coating and a silicone coating applied to the substrate coating. In accordance with certain aspects, the binder may comprise a carboxylated latex binder.
1. A release liner comprising a substrate base and a coating on the substrate base wherein the coating comprises a latex binder and hyperplatey talc; and
a silicone coating on said substrate coating, wherein the latex binder has a gel content from about 60% to 90%.
2. The release liner in accordance with claim 1 wherein the binder comprises a carboxylated latex hinder.
3. The release liner in accordance with claim 2 wherein the binder has a carboxylation percentage of between about 5 to 10%.
4. The release liner in accordance with claim 2 wherein the binder comprises a carboxylated styrene butadiene latex binder.
5. The release liner in accordance with claim 4 wherein the latex binder has a gel content from about 75% to 85%.
6. The release liner in accordance with claim 4 wherein the latex binder has a particle size in the range of 100-200 nm.
7. The release liner in accordance with claim 5 wherein the silicone coating contains no more than about 3% extractables.
8. The release liner in accordance with claim 2 wherein the substrate base comprises cellulose fibers.
9. The release liner in accordance with claim 2 wherein the silicone coating is present in a coat weight of from about 0.5 to about 1.5 lbs./ream.
10. The release liner in accordance with claim 2 wherein the silicone coating contains no more than about 5% extractables.
11. The release liner in accordance with claim 2 wherein the silicone coating contains no more than about 3% extractables.
12. A release liner comprising a substrate base and a coating on the substrate base wherein the coating comprises a carboxylated styrene butadiene binder and hyperplatey talc; and
a silicone coating on said substrate coating,
wherein the binder has a gel content from about 60% to 90% and a carboxylation percentage of between about 5 to 10% and the hyperplatey talc has an aspect ratio of at least 60.
13. The release liner in accordance with claim 12 wherein the silicone coating contains no more than about 5% extractables.
14. The release liner in accordance with claim 12 wherein the silicone coating contains no more than about 3% extractables.
15. The release liner in accordance with claim 12 wherein the binder has a glass transition temperature (Tg) of between about −35° C. and about 30° C.