Sag resistant, formaldehyde-free coated fibrous substrate
US11634591B2 · kind B2 · utility
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10References
19Claims
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Key dates
| Filing date | Jul 10, 2018 |
| Grant date | Apr 25, 2023 |
| Priority date | — |
| Expiry date | Apr 4, 2039 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31971
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to an improved formaldehyde-free coated fibrous substrate. The coating includes a crosslinked binder system which forms three dimensional networks when heat cured. After the coating is applied to the back of fibrous substrate and cured, the coating is capable of hygroscopic expansion which imparts excellent anti-sag properties. The coating is compatible with other coating systems with neutral or mild alkaline pH. The improvement being the binding system is neutralized with a volatile base so that it evaporates quickly so as not to hinder the cross-linking reaction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.