Patent US4584360A successfully refreshed from Google Patents.
US4584360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the preparation of polydiorganosiloxanes containing hydroxyaryloxy terminal groups
Assignee: Bayer AG
•
Filing: 1984-04-13
•
Granted: 1986-04-22
•
Expires: 2004-04-13
Abstract
Abstract The subject of the present invention is a process for the preparation of polydiorganosiloxanes containing hydroxyaryloxy terminal groups by reacting polydiorganosiloxanes containing bis-acyloxy terminal groups with diphenols in a molar ratio of 1:2 to 1:20.
Inventors
- 👤 Winfried Paul
- 👤 Werner Nouvertne
- 👤 Dieter Neuray
- 👤 Helmut Steinberger
- 👤 Wolfgang Grape
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:18
CPC Classifications
C; C08; C08G; C08G77/00; C08G77/04; C08G77/38; C08G77/382
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A process for the preparation of polydiorganosiloxanes containing α,ω-hydroxy-aryloxy terminal groups, characterized in that at least one polydiorganosiloxane containing α,ω-bisacyloxy terminal groups is reacted with at least one diphenol in a molar ration of 1:2 to 1:20, using at least one inorganic base selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates in at least stoichiometric quantities, base on the moles of the polydiorganosiloxanes containing α,ω-bisacyloxy terminal groups used.
Claim 2
Dependent Claim
74 words
A process for the preparation of polydiorganosiloxanes containing α,ω-hydroxy-aryloxy terminal groups, characterized in that at least one polydiorganosiloxane containing α,ω-bisacyloxy terminal groups is reacted with at least one diphenol in a molar ration of 1:2 to 1:20, using at least one inorganic base selected from the group consisting of alkali metal carbonates and alkaline earth metal carbonates in at least stoichiometric quantities, base on the moles of the polydiorganosiloxanes containing α,ω-bisacyloxy terminal groups used.
Claim 3
Dependent Claim
56 words
The process according to claim 1, characterized in that said polydiorganosiloxane containing α,ω-bisacyloxy terminal groups, conforms to the formula ##STR4## wherein the sum a+b+c is 5 to 100, and wherein R, R' and R" are identical or different and denote hydrogen, linear alkyl, branched alkyl, alkenyl, halogenated linear alkyl, halogenated branched alkyl, aryl or halogenated aryl.
Claim 4
Dependent Claim
46 words
The process in accordance with claim 1 wherein said diphenol conforms to the formula ##STR5## wherein X denotes a single bond, --CH 2 --, ##STR6## and Y 1 Y 4 are identical or different and denote hydrogen, C 1 -C 4 alkyl or a halogen atom.
References Cited (Backward Citations)
US3419634A
Cited
US3539657A
Cited
US3821325A
Cited
US3832419A
Cited
US4022753A
Cited
US3994988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |