Curable urethane (meth)acrylate polymer compositions and methods
An ethylenically unsaturated polyurethane, which is an oligomer or polymer, results from the reaction of A) an alcohol component comprising: A1) at least one hydroxylated polydiene oligomer or polymer which may optionally be alkoxylated and A2) at least one hydroxyl-functional ethylenically unsaturated compound, which is a monomer or oligomer, bearing at least one ethylenic unsaturation and B) an isocyanate component comprising at least one polyisocyanate with a functionality of at least 2, wherein the molar ratio OH/NCO is greater than 1 and wherein said polyurethane bears reactive free hydroxyl groups. Such ethylenically unsaturated polyurethanes are useful as components of curable compositions such as coatings or adhesives.
1. A mixture of:
a polyurethane polymer or oligomer represented by the following Formula (I):
X 1 —O—R 1 —O—[—C(═O)—NH—R 2 —NH—C(═O)—O—R 3 —O-] n -X 2 (I)
wherein:
X 1 and X 2 are each independently H or —C(═O)—NH—R 4 —NH—C(═O)—O—R 5 —[O—C(═O)—C(R 6 )═CH 2 ] m , subject to the proviso that at least one of X 1 and X 2 is H;
n is an integer of from 1 to 20;
m is from 1 to 5;
R 1 and R 3 are each independently a polydiene segment or an alkoxylated polydiene segment, subject to the proviso that at least one of R 1 or R 3 is a hydrogenated polybutadiene;
R 2 and R 4 are each independently an organo residue of a diisocyanate;
R 5 is C 2 to C 10 alkylene or dialkylene ether and
R 6 is H or methyl,
and
a second polyurethane polymer or oligomer in accordance with following Formula (I′)
X′ 1 —O—R 1 —O—[—C(═O)—NH—R 2 —NH—C(═O)—O—R 3 —O-] n -X′ 2 (I′)
wherein X′ 1 and X′ 2 are identical and correspond to a urethane group bearing from 1 to 5 (meth)acrylate groups according to —C(═O)—NH—R 4 —NH—C(═O)—O—R 5 —[O—C(═O)—C(R 6 )═CH 2 ] m and R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , n, and m are same as defined above in formula (I).
2. The mixture of claim 1 , wherein the hydrogenated polybutadiene comprises alkoxylated polybutadiene.
3. The mixture of claim 1 , wherein the mixture has an OH value between 1.01 mg KOH/g and 20 mg KOH/g.
4. A curable composition comprising the mixture of claim 3 .
5. The curable composition of claim 4 , wherein the curable composition is curable by radiation or by peroxide cure or by dual cure or by cure with hydroxyl-reactive compounds.
6. The curable composition of claim 4 , wherein the curable composition is a coating composition or an adhesive composition or a component for/in solar panels or a component in battery or in inkjet printing microcircuits, or a sealant composition or an encapsulant composition.
7. The curable composition of claim 4 further comprising at least one further component selected from the group consisting of reactive diluents, non-reactive diluents, fillers, colorants, pigments, matting agents, tackifiers, plasticizers, rheology modifiers, antioxidants, stabilizers, wetting agents, flowing agents, adhesion promoters, catalysts and initiators.
8. A material comprising the curable composition claim 4 , wherein the material is selected from the group consisting of coatings, paints, varnishes, adhesives, sealants, caulks, graphic arts compositions, inks, flexographic printing plate compositions and encapsulant compositions.
9. The material of claim 8 , wherein the material is an adhesive for use as a component of solar panels or as a component in battery or in inkjet printing microcircuits.
10. An electronic device comprising the adhesive of claim 9 .
11. A method for making the mixture of claim 1 , wherein the method comprises reacting an alcohol component A) with an isocyanate component B), wherein the molar ratio of OH/NCO is greater than 1 and wherein
the alcohol component A) comprises:
A1) at least one hydroxylated and optionally alkoxylated hydroxylated polydiene oligomer or polymer; and
A2) at least one hydroxyl-functional ethylenically unsaturated compound, which is a monomer or oligomer bearing at least one ethylenic unsaturation; and
the isocyanate component B) comprises at least one polyisocyanate with a functionality of at least 2.
12. The method of claim 11 , further comprising forming a blend, wherein the blend comprises the alcohol component A), the isocyanate component B), at least one catalyst, optionally at least one inhibitor and optionally one or more (meth)acrylate-functionalized monomers as diluent.
13. The method of claim 12 , wherein A2) and the isocyanate component are reacted to form an intermediate product and the intermediate product is then reacted with A1).
14. A method of preparing coatings or adhesive compositions comprising using the mixture of claim 1 .
15. A cured adhesive formed by curing the mixture of claim 1 .
16. The curable composition of claim 5 , wherein the curable composition is curable by radiation and the radiation-curable composition is curable by UV, laser, LED or EB (electron beam).