Process for recycling cured polysulfide sealants
US5349091A · kind A · utility
0Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 27, 1993 |
| Grant date | Sep 20, 1994 |
| Priority date | — |
| Expiry date | Apr 27, 2013 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/62
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Solid waste materials comprising oxidatively-cured, solid polysulfide sealants containing spent oxidant, fillers, plasticizers, and other formulating aids are reverted to a liquid sealant comprising mercaptan-terminated polysulfides by reducing them with a liquid mercaptan-terminated polysulfide at temperatures ranging from about 50.degree. to about 110.degree. C. Upon the addition of fresh curing agent and recuring, the reclaimed sealant has satisfactory tensile strength and elongation properties.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.