Radiation curable amino(meth) acrylates
The invention relates to amino(meth)acrylates obtained from the reaction of amines with a mixture of epoxy(meth)acrylates and (meth)acrylated diluent and there use for making flexible varnishes, coatings, adhesives and inks.
1. An amino(meth)acrylate produced by a method which comprises:
reacting a primary or secondary amine (A) with a mixture comprising from 25 to 99% by weight of at least one epoxy(meth)acrylate (B) comprising at least two (meth)acrylate groups and from 1 to 75% by weight of at least one (meth)acrylated diluent (C), based on a total weight of the mixture of (B) and (C), wherein (B) is different from (C),
wherein the amine (A) is selected from primary amines (A1) comprising at least one primary amino group —NH 2 and secondary amines (A2) comprising at least two secondary amino groups —NH, and
wherein the amino(meth)acrylates have a nitrogen content of at least 1.0% by weight.
2. The amino(meth)acrylate according to claim 1 wherein the amine (A1) is represented by formula R 1 —NH 2 wherein R 1 is an alkyl, optionally substituted by hydroxy, alkoxy, tertiary amine and/or aryl.
3. The amino(meth)acrylate according to claim 1 , wherein the epoxy(meth)acrylate (B) is selected from a reaction product of (meth)acrylic acid and at least one polyepoxide selected from a diglycidylether of an aromatic or aliphatic polyol and from a cycloaliphatic polyepoxide.
4. The amino(meth)acrylate according to claim 3 wherein the epoxy(meth)acrylate (B) is a reaction product of (meth)acrylic acid and diglycidyl ether of bisphenol A.
5. The amino(meth)acrylate according to claim 1 wherein the (meth)acrylated diluent (C) is selected from those which are liquid at room temperature or which exhibit a viscosity of 1 to 2000 mPa·s at 25° C.
6. The amino(meth)acrylate according to claim 1 wherein an amount of amine (A) used is such that an equivalent ratio of —N—H groups provided by amine (A) to (meth)acrylic double bonds provided by epoxy(meth)acrylate (B) and methacrylated diluent (C) is from 0.1 to 0.9.
7. The amino(meth)acrylate according to claim 1 having a content of double bonds of 0.1 to 10 meq/g.
8. A radiation curable composition containing from 5% to 99% by weight of at least one amino(meth)acrylate according to claim 1 , based on a total weight of the radiation curable composition.
9. A method for preparation of a radiation curable composition suitable for preparation of coatings, inks or varnishes comprising the steps of:
(i) providing an amino (meth) acrylate produced by a method which comprises reacting a primary or secondary amine (A) with a mixture comprising from 25 to 99% by weight of at least one epoxy(meth)acrylate (B) comprising at least two (meth)acrylate groups and from 1 to 75% by weight of at least one (meth)acrylated diluent (C), based on a total weight of the mixture of (B) and (C), wherein (B) is different from (C),
wherein the amine (A) is selected from primary amines (A1) comprising at least one primary amino group —NH 2 and secondary amines (A2) comprising at least two secondary amino groups —NH,
wherein the amino(meth)acrylates have a nitrogen content of at least 1.0% by weight, and
(ii) incorporating said amino (meth) acrylate into a radiation curable composition that is suitable for use as a coating, ink or varnish.
10. The method according to claim 9 wherein said radiation curable composition contains at least one additive suitable for use in coatings, inks or varnishes.
11. The method according to claim 10 wherein said at least one additive is present in an amount of up to 10% by weight of said radiation curable composition.