Metacyclophane, synthesis thereof, and compositions stabilized thereby
US4434265A · kind A · utility
6Cited by
2References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 15, 1983 |
| Grant date | Feb 28, 1984 |
| Priority date | — |
| Expiry date | Jun 15, 2003 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08K5/13
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
[1.1.1.1.]metacyclophane is a cyclic compound consisting of two alkane bisphenol molecules coupled through their available ortho positions by a methylene moiety. The cyclic compound is initially formed as a dihydrate by reaction of a 2,2'-di-substituted alkane bisphenol such as a 2,2'-di-t.butylated alkane bisphenol with paraformaldehyde at about 170.degree. C. in an aromatic solvent. The dihydrate may be dehydrated under select conditions. The cyclic compound is an excellent antioxidant in mineral filled natural rubber, and in polyolefins, particularly in polypropylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.