Polymer, process for producing the polymer, and curable composition containing the polymer
View Patent ↗A vinyl polymer having, at a molecular chain terminus, a structure represented by the general formula 1: (wherein R 3 is a hydroxy, amino, epoxy, carboxylic acid, ester, ether, amide or silyl group, an alkenyl group having low polymerizability, an organic compound having 1 to 20 carbon atoms, X is a halogen atom, a nitroxide or sulfide group or a cobalt porphyrin complex).
1. A vinyl polymer having, at a molecular chain terminus, a structure represented by the general formula 1:
wherein R 3 is a hydroxy, amino, epoxy, carboxylic acid ester, ether, amide or silyl group, a group represented by the general formula 2:
in which R 4 represents a hydrogen atom or a methyl group, or a polymerizable olefin-free organic group containing 1 to 20 carbon atoms,
R 1 is a divalent hydrocarbon group containing 1 to 20 carbon atoms or a group having a structure represented by the general formula 3:
in which R 5 is an oxygen atom, a nitrogen atom or an organic group containing 1 to 20 carbon atoms, R 6 is a hydrogen atom or a methyl group and each may be the same or different, and when R 3 is a group represented by the general formula 2, R 1 is —(CH 2 ) n —, —CH(CH 3 )—, —CH(CH 2 CH 3 )—, —C(CH 3 ) 2 —, —C(CH 3 )(CH 2 CH 3 )—, —C(CH 2 CH 3 ) 2 — or —CH 2 CH(CH 3 )—, wherein n is an integer of 1 to 20.
and R 2 is a hydrogen atom or a methyl group and X is a halogen atom, a nitroxide or sulfide group or a cobalt porphyrin complex.
2. The polymer according to claim 1 , wherein, in the general formula 1, R 3 is a group selected from among hydroxy, amino, epoxy, carboxylic acid, ester, ether, amide and silyl groups.
3. The polymer according to claim 1 , wherein, in the general formula 1, R 3 is represented by the general formula 2.
4. The polymer according to claim 1 , wherein, in the general formula 1, X is a halogen atom.
5. The polymer according to claim 1 , wherein, in the general formula 1, R 2 is a hydrogen atom.
6. The polymer according to claim 1 , wherein the vinyl polymer is a (meth)acrylic polymer.
7. The polymer according to claim 1 , wherein the vinyl polymer is an acrylic ester polymer.
8. The polymer according to claim 1 , wherein the vinyl polymer is a butyl acrylate polymer.
9. The polymer according to claim 1 , which has two or more terminal groups represented by the general formula 1 in each molecule.
10. The polymer according to claim 1 , which has a number average molecular weight of 500 to 100,000.
11. The polymer according to claim 1 , which has a weight average molecular weight (Mw)-to-number average molecular weight (Mn) ratio (Mw/Mn) of less than 1.8 as determined by gel permeation chromatography.