Adhesive agent and adhesion method
There is provided an adhesive agent exhibiting high adhesive strength to polyolefin. An adhesive agent contains a chloroprene copolymer latex containing a chloroprene copolymer (A) and a metal oxide (B). The chloroprene copolymer (A) is a copolymer of a monomer group containing chloroprene (A-1), α,β-unsaturated carboxylic acid (A-2), and 2,3-dichloro-1,3-butadiene (A-3). The chloroprene copolymer (A) has a tetrahydrofuran-soluble component soluble in tetrahydrofuran and the weight average molecular weight of the tetrahydrofuran-soluble component is 80000 or more and 140000 or less. When the amount of the metal oxide (B) based on 100 parts by mass of the chloroprene copolymer (A) is defined as Y part(s) by mass and the weight average molecular weight of the tetrahydrofuran-soluble component is defined as X, the content of the metal oxide (B) satisfies Formula: −1.2×X/100000+1.6<Y<−4.2×X/100000+5.7.
1. An adhesive agent comprising:
a chloroprene copolymer latex containing a chloroprene copolymer (A); and
a metal oxide (B), wherein
the chloroprene copolymer (A) is a copolymer of a monomer group containing chloroprene (A-1), α,β-unsaturated carboxylic acid (A-2), and 2,3-dichloro-1,3-butadiene (A-3),
when an amount of the chloroprene copolymer (A) is 100 parts by mass, the chloroprene copolymer (A) contains 80.0 parts by mass or more and 99.4 parts by mass or less of a unit derived from the chloroprene (A-1), 0.5 part by mass or more and 10.0 parts by mass or less of a unit derived from the α,β-unsaturated carboxylic acid (A-2), and 0.1 part by mass or more and 4.0 parts by mass or less of a unit derived from the 2,3-dichloro-1,3-butadiene (A-3),
the chloroprene copolymer (A) has a tetrahydrofuran-soluble component soluble in tetrahydrofuran and a weight average molecular weight of the tetrahydrofuran-soluble component is 80000 or more and 90000 or less, and
when an amount of the metal oxide (B) based on 100 parts by mass of the chloroprene copolymer (A) is defined as Y part(s) by mass and the weight average molecular weight of the tetrahydrofuran-soluble component is defined as X, a content of the metal oxide (B) satisfies Formula: −1.2×X/100000+1.6<Y<−4.2×X/100000+5.7.
2. The adhesive agent according to claim 1 , wherein
the metal oxide (B) is zinc oxide.
3. The adhesive agent according to claim 1 , wherein
the α,β-unsaturated carboxylic acid (A-2) is methacrylic acid.
4. The adhesive agent according to claim 1 , wherein
the weight average molecular weight of the tetrahydrofuran-soluble component is 84000 or more and 90000 or less.
5. The adhesive agent according to claim 1 , wherein
the chloroprene copolymer (A) has a gel insoluble in tetrahydrofuran and a content of the gel in the chloroprene copolymer (A) is 0.1% by mass or more and less than 15% by mass.
6. The adhesive agent according to claim 1 , wherein
the chloroprene copolymer latex contains an emulsifier.
7. The adhesive agent according to claim 6 , wherein
the emulsifier is partially saponified polyvinyl alcohol.
8. The adhesive agent according to claim 1 , the adhesive agent forms a film-like shape.
9. The adhesive agent according to claim 1 , the adhesive agent is used for bonding of an adherend formed of polyolefin.
10. An adhesion method comprising:
bonding two adherends using the adhesive agent according to claim 1 , wherein
at least one of the two adherends is formed of polyolefin.
11. The adhesive agent according to claim 2 , wherein
the α,β-unsaturated carboxylic acid (A-2) is methacrylic acid.
12. The adhesive agent according to claim 2 , wherein
the weight average molecular weight of the tetrahydrofuran-soluble component is 84000 or more and 90000 or less.
13. The adhesive agent according to claim 3 , wherein
the weight average molecular weight of the tetrahydrofuran-soluble component is 84000 or more and 90000 or less.
14. The adhesive agent according to claim 2 , wherein
the chloroprene copolymer (A) has a gel insoluble in tetrahydrofuran and a content of the gel in the chloroprene copolymer (A) is 0.1% by mass or more and less than 15% by mass.
15. The adhesive agent according to claim 3 , wherein
the chloroprene copolymer (A) has a gel insoluble in tetrahydrofuran and a content of the gel in the chloroprene copolymer (A) is 0.1% by mass or more and less than 15% by mass.
16. The adhesive agent according to claim 4 , wherein
the chloroprene copolymer (A) has a gel insoluble in tetrahydrofuran and a content of the gel in the chloroprene copolymer (A) is 0.1% by mass or more and less than 15% by mass.
17. The adhesive agent according to claim 2 , wherein
the chloroprene copolymer latex contains an emulsifier.
18. The adhesive agent according to claim 3 , wherein
the chloroprene copolymer latex contains an emulsifier.
19. The adhesive agent according to claim 4 , wherein
the chloroprene copolymer latex contains an emulsifier.
20. The adhesive agent according to claim 5 , wherein
the chloroprene copolymer latex contains an emulsifier.