US2958676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Naphthalene-formaldehyde condensation products
Assignee: BASF SE
•
Filing: 1957-11-26
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Granted: 1960-11-01
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Expires: 1977-11-26
Abstract
No abstract record available.
Inventors
- 👤 Krzikalla Hans
- 👤 Trakranen Felicitas Van Taack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:07
CPC Classifications
C; C08; C08G; C08G10/00; C08G10/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
184 words
A RESINOUS NAPHTHALENE-FORMALDEHYDE CONDENSATION PRODUCT HAVING LESS THAN 3% BY WEIGHT OXYGEN AND A SOFTENING POINT BETWEEN 60*C. AND 110*C., THE MOLAR RATIO OF NAPHTHALENE TO FORMALDEHYDE BEING ABOUT 1:1 TO 1:1.5, RESPECTIVELY, SAID CONDENSATION PRODUCT BEING SOLUBLE IN TOLUENE IN ALL PROPORTIONS AND HAVING LIMITED SOLUBILITY IN BUTYL ACETATE, SAID CONDENSATION PRODUCT ING PRODUCED BY CONDENSING AT A TEMPERATURE IN THE RANGE OF 50-100*C. NAPHTHALENE AND FORMALDEHYDE AT A MOLAR RATIO IN THE RANGE OF ABOUT 1:1 TO 1:1.5, RESPECTIVELY, IN A REACTION MIXTURE CONTAINING 20-60% STRENGTH SULFURIC ACID AQUEOUS SOLUTION UNTIL THE OXYGEN CONTENT OF THE PRODUCED NAPHTHALENE-FORMALDEHYDE RESIN IS NOT GREATER THAN 3% BY WEIGHT AND SAID RESIN HAS A SOFTENING POINT IN THE RANGE OF 60-110*C., IS SOLUBLE IN TOLUENE IN ALL PROPORTIONS AND HAS ONLY LIMITED SOLUBILITY IN BUTYL ACETATE, THE CONDENSATION BEING COMPLETED WITH THE REACTION MIXTURE CONTAINING SUFFICIENT WATER-IMMISCIBLE, ORGANIC SOLVENT FOR THE NAPHTHALENE-FORMALDEHYDE CONDENSATION RESIN TO PROVIDE A LIQUID RESIN PHASE, WHICH SOLVENT IS NON-REACTIVE WITH THE REACTION MIXTURE AT THE REACTION CONDITIONS ENUMERATED AND IS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND HALOGENATED HYDROCARBONS.
Claim 2
Dependent Claim
184 words
A RESINOUS NAPHTHALENE-FORMALDEHYDE CONDENSATION PRODUCT HAVING LESS THAN 3% BY WEIGHT OXYGEN AND A SOFTENING POINT BETWEEN 60*C. AND 110*C., THE MOLAR RATIO OF NAPHTHALENE TO FORMALDEHYDE BEING ABOUT 1:1 TO 1:1.5, RESPECTIVELY, SAID CONDENSATION PRODUCT BEING SOLUBLE IN TOLUENE IN ALL PROPORTIONS AND HAVING LIMITED SOLUBILITY IN BUTYL ACETATE, SAID CONDENSATION PRODUCT ING PRODUCED BY CONDENSING AT A TEMPERATURE IN THE RANGE OF 50-100*C. NAPHTHALENE AND FORMALDEHYDE AT A MOLAR RATIO IN THE RANGE OF ABOUT 1:1 TO 1:1.5, RESPECTIVELY, IN A REACTION MIXTURE CONTAINING 20-60% STRENGTH SULFURIC ACID AQUEOUS SOLUTION UNTIL THE OXYGEN CONTENT OF THE PRODUCED NAPHTHALENE-FORMALDEHYDE RESIN IS NOT GREATER THAN 3% BY WEIGHT AND SAID RESIN HAS A SOFTENING POINT IN THE RANGE OF 60-110*C., IS SOLUBLE IN TOLUENE IN ALL PROPORTIONS AND HAS ONLY LIMITED SOLUBILITY IN BUTYL ACETATE, THE CONDENSATION BEING COMPLETED WITH THE REACTION MIXTURE CONTAINING SUFFICIENT WATER-IMMISCIBLE, ORGANIC SOLVENT FOR THE NAPHTHALENE-FORMALDEHYDE CONDENSATION RESIN TO PROVIDE A LIQUID RESIN PHASE, WHICH SOLVENT IS NON-REACTIVE WITH THE REACTION MIXTURE AT THE REACTION CONDITIONS ENUMERATED AND IS SELECTED FROM THE GROUP CONSISTING OF HYDROCARBONS AND HALOGENATED HYDROCARBONS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-11-01 | 1964-05-02 | 1964-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-11-01 | 1968-05-02 | 1968-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-11-01 | 1972-05-02 | 1972-11-01 | $7700.00 | Window Closed / Lapsed |