| abstract |
A pressure-sensitive rubber adhesive which contains, as the main rubber ingredient, (i) a natural rubber comprising, as the main component, fine particles having a particle diameter of 1 νm or smaller contained in a raw natural rubber latex, (ii) a linear natural-rubber polymer contained in a raw natural rubber latex, (iii) a natural rubber having a weight-average molecular weight of 100,000 to 1,000,000 contained in a raw natural rubber latex, (iv) a natural rubber having a green breaking strength of 0.5 MPa or lower contained in a raw natural rubber latex, or (v) a natural rubber contained in a serum obtained by centrifuging a raw natural rubber latex. The adhesive not only has excellent tackiness properties but can be easily produced with a less amount of energy in a reduced period because a peptization step can be substantially omitted. |