Method of preparing moisture barrier sheet material
US5972271A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1998 |
| Grant date | Oct 26, 1999 |
| Priority date | — |
| Expiry date | Feb 27, 2018 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31823
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A modified bitumen sheet material and method for a protective moisture barrier, particularly for masonry surfaces. The sheet material has a bitumen layer modified by the addition of a minor amount of a long-chain polybutadiene-isocyanate urethane polymer and optionally, a modifying amount of a hydrocarbon oil to provide a stable, non-flow and selected tackified surface properties to the bitumen layer. The sheet material includes a releasable casting paper film on one surface of the bitumen layer, to be removed prior to use, and a cross-linked polyethylene film bonded to the other outer surface of the bitumen layer as a handling or moisture barrier sheet. The sheet material is prepared by casting the hot, melted bitumen as a layer onto a casting paper sheet and applying the outer film to the exposed bitumen surface to bond to the top surface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.