CELLULOSIC UV CURABLE COMPOSITIONS AND ARTICLES
Cellulosic ultra-violet curable coating compositions, coatings and articles made from the compositions, and methods for making such coatings and articles and compositions are disclosed and claimed. Such coatings exhibit superior adhesion and hardness, without appreciable curl.
1 . A composition comprising from about 14.3 weight percent to about 33.9 weight percent of at least one cured cellulosic polymer, from about 28.6 weight percent to about 48.2 weight percent of at least one cured radiation curable monomer, and from about 37.5 weight percent to about 57.1 weight percent of at least one cured heat curable monomer.
2 . The composition according to embodiment 1, wherein the at least one cellulosic polymer comprises at least one cellulose ester.
3 . The composition according to embodiment 1, wherein the at least one cellulosic polymer comprises cellulose acetate butyrate.
4 . The composition according to embodiment 1, wherein the at least one radiation curable monomer comprises from about one to about six free-radically polymerizable groups.
5 . The composition according to embodiment 1, wherein the at least one radiation curable monomer comprises dipentaerythritol pentaacrylate.
6 . The composition according to embodiment 1, wherein the at least one heat curable monomer comprises at least about three ether groups.
7 . The composition according to embodiment 1, wherein the at least one heat curable monomer comprises hexamethoxymethylmelamine.
8 . An article comprising at least one layer comprising the composition according to embodiment 1.
9 . A composition comprising at least one cured cellulosic polymer, at least one cured radiation curable monomer, and at least one cured heat curable monomer, wherein the composition has an adhesion rating of 5, a pencil hardness of at least about 3H, and a curl of less than about 2.0 cm, when evaluated as a 4.0 to 8.0 g/m 2 cured layer on a 30 cm×30 cm×7 0 mil polyethylene terephthalate substrate.
10 . An article comprising at least one layer comprising the composition of embodiment 9.
11 . A composition comprising:
from about 15 parts by weight to about 52 parts by weight of a first composition comprising at least one cellulosic polymer and at least one radiation curable monomer; and
from about 25 parts by weight to about 30 parts by weight of at least one heat curable monomer.
12 . The composition according to embodiment 11, wherein the weight ratio of the at least one cellulosic polymer to the at least one radiation curable monomer is from about 1:10 to about 10:1.
13 . The composition according to embodiment 11, further comprising at least one solvent comprising at least one ketone, ester, or alcohol.
14 . The composition according to embodiment 11, wherein the at least one solvent comprises one or more of methyl ethyl ketone, butyl acetate, and ethanol.
15 . The composition according to embodiment 11, further comprising at least one photoinitiator.
16 . The composition according to embodiment 11, further comprising at least one thermal curing catalyst.
17 . A layer formed by a method comprising providing the composition according to embodiment 11 and curing the composition.
18 . The layer according to embodiment 17 having an adhesion rating of 5, a pencil hardness of at least about 3H, and a curl of less than about 2.0 cm, when evaluated as a 4.0 to 8.0 g/m 2 cured layer on a 30 cm×30 cm×7.0 mil polyethylene terephthalate substrate.
19 . An article comprising at least one layer according to embodiment 17.