Patent application EP19179164A (EP), filed 2019-06-07
Publication number: EP3747925A1
Title: RADIATION-CURABLE COMPOSITION BY ANIONIC POLYMERIZATION
Abstract: [0001]    The present invention refers to a radiation-curable composition comprising or consisting of
A) at least one photo-base generator, which can generate a super base;
B) (macro)monomers which are able to undergo an anionic polymerization via Michael addition comprising or consisting of
B1) at least one (macro)monomer having at least one Michael donor group and at least one Michael acceptor group; and/or
B2) at least one (macro)monomer having at least two Michael donor groups and at least one (macro)monomer having at least two Michael acceptor groups;
C) optionally at least one polyethylenimine;
D) optionally at least one additive.
[0002]    Furthermore, the present invention pertains to an adhesive, sealant or coating obtainable by radiation-curing the radiation-curable composition according to the present invention and a method of radiation-curing the radiation-curable composition according to the present invention, comprising the steps:
providing a radiation-curable composition according to the present invention and exposing the radiation-curable composition to radiation, for 10 seconds to 5 minutes. The radiation-curable compositions of the present invention do not require that irradiation is continuously applied until the curing is completed. Once the curing of the compositions is initiated, they are able to continue to cure in parts of the compositions which are in the dark/shadow.
IPC codes: C08G  61/    12            A I
C08L  65/    00            A I
C09D 165/    00            A I
C09J 165/    00            A I
Claims: number: 1
text: A radiation-curable composition comprising or consisting of
number: 2
text: The radiation-curable composition according to claim 1, wherein the at least one photo-base generator is selected from 1,2-Diisopropyl-3[bi(dimethylamin)methylene]guanidium-2-(3-benzoylphenyl)propionate, 1,2-Dicyclohexyl-4,4,5,5-tetramethylbiguanidium n-butyltriphenylborate and (Z)-{[Bis(dimethylamino)methylidene]amino}-N-cyclohexyl(cyclohexylamino)methaniminium tetrakis(3-fluorophenyl)borate, nitrobenzyl capped 1,8-diazabicyclo-[5.4.0]undec-7-ene, benzyl capped 1,8-diazabicyclo-[5.4.0]undec-7-ene, 2-(9-Oxoxanthen-2-yl)propionic acid 1,5,7-triazabicyclo[4.4.0]dec-5-ene salt, 1,5,7-Triazabicyclo[4.4.0]dec-5-ene•HBPh<4> or mixtures thereof; preferably the at least one photo-base generator is selected from 1,2-Diisopropyl-3[Bi(dimethylamin)methylene]guanidium-2-(3-benzoylphenyl)propionate, 1,2-Dicyclohexyl-4,4,5,5-tetramethylbiguanidium n-butyltriphenylborate and (Z)-{[Bis(dimethylamino)methylidene]amino}-N-cyclohexyl(cyclohexylamino)methaniminium tetrakis(3-fluorophenyl)borate or mixtures thereof; most preferably the photo-base generator is 1,2-Diisopropyl-3[Bi(dimethylamin)methylene]guanidium-2-(3-benzoylphenyl)propionate.
number: 3
text: The radiation-curable composition according to claim 1 or 2, wherein the at least one (macro)monomer having at least one Michael donor group and at least one Michael acceptor group B1
number: 4
text: The radiation-curable composition according to any of the preceding claims, wherein the at least one (macro)monomer having at least two Michael donor groups of B2
number: 5
text: The radiation-curable composition according to any of the preceding claims, wherein the at least one polyethylenimine has a number average molecular weight of 200 to 70,000 g/mol, preferably 300 to 30,000 g/mol, more preferably 300 to 10,000 g/mol.
number: 6
text: The radiation-curable composition according to any of the preceding claims, wherein the at least one additive is selected from tougheners, rheology modifiers, thickeners, leveling agents, radiation-sensitizers or mixtures thereof.
number: 7
text: The radiation-curable composition according to any of the preceding claims, wherein in B2) the at least one (macro)monomer having a Michael donor group and at least one (macro)monomer having a Michael acceptor group are present in a mole ratio of 2:1 to 1:2, preferably 1:1.
number: 8
text: The radiation-curable composition according to any of the preceding claims, wherein
number: 9
text: An adhesive, sealant or coating obtainable by radiation-curing the radiation-curable composition according to any of claims 1 to 8.
number: 10
text: A method of radiation-curing the radiation-curable composition according to any of claims 1 to 8, comprising the steps: providing a radiation-curable composition according to any of claims 1 to 8 and exposing the radiation-curable composition to radiation, preferably UV, more preferably UVA-C, most preferably with an intensity of 0.35 to 0.5 mW/cm<2>, most preferably 0.4 mW/cm<2>, for 10 seconds to 5 minutes, preferably 30 seconds to 2 minutes.
number: 11
text: The method of claim 10, wherein the reaction temperature is 0 to 70 °C, preferably 10 to 50 °C, more preferably 10 to 35 °C.
number: 12
text: The method of claim 10 or 11, wherein the reaction is performed in an inert atmosphere, preferably under nitrogen.
Office action: search_report, dated 2020-12-09
Rejection reasons: novelty_epc_54
inventive_step_epc_56
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Final disposition: pending (2020-12-09)