| 摘要 |
PROBLEM TO BE SOLVED: To provide a waterproof sheet for a building substrate, which hardly causes the intrusion of water from the periphery of a nail hole even if a nail and the like are driven in construction, which fills a microspace around the nail hole by making a water-absorbing polymer resin expanded by water absorption, even if the water intrudes, and which is excellent in water sealability and its durability. SOLUTION: This waterproof sheet for the building substrate is a multilayer structure in which a nonwoven fabric with a swelling layer composed of the water-absorbing polymer resin is held by being sandwiched between two layers of synthetic resin films. The 5-40 g/m<SP>2</SP>water-absorbing polymer resin with a water absorption expansion magnification more than 200 times is formed as the swelling layer. The waterproof sheet is formed in such a manner that an occupied area of the swelling layer with respect to the nonwoven fabric is in the range of 40-100%. COPYRIGHT: (C)2009,JPO&INPIT |
