| 摘要 |
To provide a single-sealed multi-layer transparent unit, particularly a double-glazing unit, excellent in shape retention and water vapor permeation resistance. In a single-sealed multi-layer transparent unit, particularly a double-glazing unit, wherein only an elastomer spacer is used, said elastomer spacer contains, as the matrix component, at least one butyl elastomer component selected from the group consisting of polyisobutylene, butyl rubber and modified butyl rubber; Molecular Weight Index (MWI) of the butyl elastomer component represented by the following formula (1) is at least 400,000: MWI=Sigma(Mw(i)x(mass % of the i-th butyl elastomer component based on the total amount of all butyl elastomer components/100)) (1) (wherein i is an integer of at least 1 representing the number of types of butyl elastomer components contained as the matrix component in the elastomer spacer, and Mw(i) represents the viscosity-averaged molecular weight of the i-th butyl elastomer component); and the elastomer spacer contains no crystalline polyolefin or less than 2 mass % of crystalline polyolefin.
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