Radiation curable and printable composition

A reactive curable printable composition, comprising:

• (i) at least one polymer A comprising at least one terminal group of formula (I):
• -A1-C(═O)—CR1═CH2 (I),
• wherein:
• A1 comprises a substituted or unsubstituted amide, carbamate, urethane, urea, imino, siloxane, carboxylate, carbamoyl, amidino, carbonate, sulfonate or sulfinate group;
• R1 is selected from H and C1-C4 alkyl;
• wherein the polymer backbone of the at least one polymer A is a polyoxyalkylene;
• and
• (ii) at least one filler that is configured to modify one or more rheological properties of the composition,
• wherein the composition is in a form of a paste and has a yield stress of greater than 25, wherein the yield stress is calculated using the formula:
• τ
• 1
• 2
• =
• k
• oc
• 1
• 2
• +
• k
• c
• 1
• 2
• ⁢
• γ
• 1
• 2
• ,
• wherein τ (tau) is shear stress, koc is Casson yield stress, kc is Casson plastic viscosity and γ (gamma) is shear rate, wherein the shear rate and the shear stress are measured using BS EN ISO 3219:1995, wherein the measuring conditions are as follows:
• Geometry:
• 25 mm plate/plate geometry, Gap:
• 0.25 mm, F=0N, under nitrogen, 25° C., Shear rate 0.3-40 s−1, wherein Casson's model is used for extrapolation.