Latex composition

1. A latex composition comprising:

a latex (A) of a diene rubber (a) having a weight average molecular weight of 50,000 or more and 1,000,000 or less and containing an ethylenically unsaturated acid monomer unit; and

a latex (B) of a diene rubber (b) having a weight average molecular weight of 500 or more and less than 50,000 and containing an ethylenically unsaturated acid monomer unit.

2. The latex composition according to claim 1 ,

wherein the diene rubber (a) and the diene rubber (b) are present at a weight ratio [diene rubber (a)/diene rubber (b)] of 99/1 to 70/30.

3. The latex composition according to claim 1 ,

wherein the ethylenically unsaturated acid monomer unit contained in the diene rubber (a) is a carboxyl group-containing ethylenically unsaturated monomer unit, and

the ethylenically unsaturated acid monomer unit contained in the diene rubber (b) is a carboxyl group-containing ethylenically unsaturated monomer unit.

4. The latex composition according to claim 1 ,

wherein the ethylenically unsaturated acid monomer unit contained in the diene rubber (b) is a carboxyl group-containing ethylenically unsaturated monomer unit, and

the number of moles of carboxyl groups is 0.01 to 0.35 ephr per 100 g of the diene rubber (b).

5. The latex composition according to claim 1 ,

wherein the diene rubber (a) is a nitrile rubber further containing an α,β-ethylenically unsaturated nitrile monomer unit.

6. The latex composition according to claim 1 ,

wherein the diene rubber (b) is a nitrile rubber further containing an α,β-ethylenically unsaturated nitrile monomer unit.

7. The latex composition according to claim 1 ,

wherein the latex composition is used to form a rubber layer on a fiber substrate.

8. A laminate comprising a fiber substrate and a rubber layer laminated thereon,

the fiber substrate comprising a plurality of fibers,

the rubber layer being formed from the latex composition according to claim 1 .