Radiation-curable compositions for pigmented inks
The present invention relates to radiation-curable compositions useful as ink vehicles or inks, in particular UV-curable inks, such as UV-litho inks, comprising a (meth)acrylated styrene allyl alcohol copolymer obtained from the (meth)acrylation of a styrene allyl alcohol (SAA) copolymer with (meth)acrylic acid and/or one or more alkyl(meth)acrylates, and at least one alkoxylated acrylated monomer.
1. Radiation-curable composition, comprising (a) at least one (meth)acrylated styrene allyl alcohol copolymer obtained from the (meth)acrylation of a styrene allyl alcohol (SAA) copolymer with (meth)acrylic acid and/or one or more alkyl(meth)acrylates, and (b) at least one alkoxylated acrylated monomer obtained from alkoxylated and (meth)acrylated di-, tri- and polyhydroxy compounds.
2. Composition according to claim 1 , comprising 10-90% by weight(meth)acrylated SAA copolymer and 10-90% by weight alkoxylated (meth)acrylated monomer, each based on the total weight of the (meth)acrylated SAA copolymer and alkoxylated (meth)acrylated monomer.
3. Composition according to claim 1 , wherein the alkoxylated (meth)acrylated monomer is selected from the group consisting of alkoxylated triol tri(meth)acrylates, alkoxylated diol di(meth)acrylates.
4. Composition according to claim 1 , wherein the alkoxylated (meth)acrylated monomer is selected from the group consisting of ethoxylated glycerol tri(meth)acrylates, propoxylated glycerol tri(meth)acrylates, ethoxylated neopentylglycol di(meth)acrylates, propoxylated neopentylglycol di(meth)acrylates, ethoxylated trimethylolpropane tri(meth)acrylates, propoxylated trimethylolpropane tri(meth)acrylates, (meth)acrylated bisphenol A ethoxylates, (meth)acrylated bisphenol A propoxylates, alkoxylated ditrimethylolpropane tetra(meth)acrylates, alkoxylated pentaerythritol tetra(meth)acrylates and alkoxylated dipentaerythritol penta/hexa (meth)acrylates.
5. Composition according to claim 1 , further comprising one or more compounds selected from pigments, photoinitiators, and ink additives.
6. Process of preparing a radiation-curable composition, comprising
a) admixing a styrene allyl alcohol (SAA) copolymer with at least one alkoxylated polyol and
b) simultaneously in situ co-(meth)acrylating the mixture obtained under a) in order to obtain a composition according to claim 1 .
7. Radiation-curable composition obtained by the process of claim 6 .
8. Ink Vehicle or ink containing the radiation-curable composition as claimed in claim 1 .
9. Polymeric composition obtained by curing the radiation-curable composition as claimed in claim 1 .
10. Substrate partially or entirely coated with the polymeric composition as claimed in claim 9 .
11. Composition according to claim 3 wherein the alkoxylated (meth)acrylated monomer is selected from alkoxylated (meth)acrylated bisphenol A derivatives.