Patent US4079040A successfully refreshed from Google Patents.
US4079040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfo-containing phenol-formaldehyde condensates
Assignee: Cassella Farbwerke Mainkur AG
•
Filing: 1975-04-30
•
Granted: 1978-03-14
•
Expires: 1995-04-30
Abstract
Abstract Spreadability and/or strength of water-setting inorganic bonding compositions are improved by incorporating in them a water-soluble condensation product of formaldehyde with a diphenol ##STR1## The condensation can also take place in the presence of a water-soluble sulfite, a water-soluble sulfamate, a water-soluble pyrosulfite, a phenol sulfonic acid or a naphthalene sulfonic acid.
Inventors
- 👤 Joachim Ribka
- 👤 Otto Trosken
- 👤 Karlfried Keller
- 👤 Erwin Herrmann
- 👤 Wolfgang Bodenstedt
- 👤 Peter Dorries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:12
CPC Classifications
C; C04; C04B; C04B24/00; C04B24/16; C04B24/20; C04B24/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A water-soluble condensation product of formaldehyde, a diphenol ##STR4## wherein X is a direct bond, or --SO 2 --, --SO--, --S--, --CH 2 --, --C(CH 3 ) 2 --, or --CO--, n and n' are independently 1 or 2, m and m' total no more than 0.5, and Me and Me' are independently a proton, an alkali metal, alkaline earth metal, or ammonium cation, and a water-soluble sulfamate, the molor proportion of diphenol to formaldehyde being between about 5:1 and about 1:10, and mol ratio of sulfamate to diphenol is between about 1:100 and 6:1, and a 20%-by-weight aqueous solution of the condensation product at 25° C showing a surface tension of about 60 to about 80 millinewtons per meter.
Claim 2
Dependent Claim
120 words
A water-soluble condensation product of formaldehyde, a diphenol ##STR4## wherein X is a direct bond, or --SO 2 --, --SO--, --S--, --CH 2 --, --C(CH 3 ) 2 --, or --CO--, n and n' are independently 1 or 2, m and m' total no more than 0.5, and Me and Me' are independently a proton, an alkali metal, alkaline earth metal, or ammonium cation, and a water-soluble sulfamate, the molor proportion of diphenol to formaldehyde being between about 5:1 and about 1:10, and mol ratio of sulfamate to diphenol is between about 1:100 and 6:1, and a 20%-by-weight aqueous solution of the condensation product at 25° C showing a surface tension of about 60 to about 80 millinewtons per meter.
Claim 3
Dependent Claim
20 words
The condensation product of claim 1 in which n and n' are each 1 and X is --SO 2 --.
Claim 4
Dependent Claim
13 words
The condensation product of claim 2 in which the diphenol is essentially 4,4'-dihydroxydiphenylsulfone.
Claim 5
Dependent Claim
19 words
The condensation product of claim 1 in which there is at least one sulfo group per mol of diphenol.
References Cited (Backward Citations)
US2357798A
Cited
US2621164A
Cited
US3065039A
Cited
US3221079A
Cited
US3502610A
Cited
US3640932A
Cited
US3644269A
Cited
US3931083A
Cited
USB465955I5
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-13 | 1981-09-12 | 1982-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-13 | 1985-09-12 | 1986-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-13 | 1989-09-12 | 1990-03-14 | $7700.00 | Window Closed / Lapsed |