Block polymer, polymer composition, and adhesive
Provided is a block polymer including two or more polymer block As each having a value β of 0.20 or less and a functional group F containing at least one element selected from a group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of terminals of the two or more polymer block As, in which the block polymer has a value α of 0.75 or more, when p, q, r and s are defined as a component proportion (molar proportion) of a structural unit represented by Formula (1), a component proportion of a structural unit represented by Formula (2), a component proportion of a structural unit represented by Formula (3), and a component proportion of a structural unit represented by Formula (4), in the polymer, respectively.
1. A block polymer comprising:
two or more polymer block As each having a value β of 0.20 or less represented by the following equation (ii); and
a functional group F comprising at least one element selected from a group consisting of nitrogen, silicon, oxygen, and sulfur in a part or all of the initiating terminals of the two or more polymer block As,
wherein the block polymer has a value α of 0.75 or more represented by the following equation (i), where p is defined as a component proportion (molar proportion) of a structural unit represented by the following formula (1), q is defined as a component proportion (molar proportion) of a structural unit represented by the following formula (2), r is defined as a component proportion (molar proportion) of a structural unit represented by the following formula (3), and s is defined as a component proportion (molar proportion) of a structural unit represented by the following formula (4), in the polymer
2. The block polymer according to claim 1 ,
wherein the block polymer has a structure in which two or more polymer chains having the polymer block A bond to a partial structure E derived from a coupling agent.
3. The block polymer according to claim 2 ,
wherein the block polymer has a structure in which four or more polymer chains having the polymer block A bond to the partial structure E.
4. The block polymer according to claim 2 ,
wherein the polymer block A is arranged at an end of the block polymer, and
the block polymer has the functional group F at a terminal of the block polymer.
5. The block polymer according to claim 2 ,
wherein the coupling agent has a functional group containing nitrogen.
6. The block polymer according to claim 1 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.
7. The block polymer according to claim 1 ,
wherein the block polymer is modified with maleic anhydride.
8. The block polymer according to claim 1 , further comprising:
a polymer block B having the value β of 0.25 or more.
9. The block polymer according to claim 8 ,
wherein the polymer block B has a structural unit derived from a conjugated diene compound and a structural unit derived from an aromatic vinyl compound.
10. A polymer mixture comprising:
the block polymer according to claim 1 ; and
a block polymer having one polymer block A and having the value α of 0.75 or more.
11. An adhesive, which is obtained using the block polymer according to claim 1 .
12. The block polymer according to claim 3 ,
wherein the polymer block A is arranged at an end of the block polymer, and
the block polymer has the functional group F at a terminal of the block polymer.
13. The block polymer according to claim 3 ,
wherein the coupling agent has a functional group containing nitrogen.
14. The block polymer according to claim 4 ,
wherein the coupling agent has a functional group containing nitrogen.
15. The block polymer according to claim 12 ,
wherein the coupling agent has a functional group containing nitrogen.
16. The block polymer according to claim 2 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.
17. The block polymer according to claim 3 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.
18. The block polymer according to claim 4 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.
19. The block polymer according to claim 5 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.
20. The block polymer according to claim 12 ,
wherein the functional group F comprises at least one selected from a group consisting of a primary amino group, a secondary amino group, a tertiary amino group, and an imide group.