Patent US3282885A successfully refreshed from Google Patents.
US3282885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing polyacetals
Assignee: BASF SE
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Filing: 1964-09-17
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Granted: 1966-11-01
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Expires: 1984-09-17
Abstract
No abstract record available.
Inventors
- 👤 Schwartz Erich
- 👤 Ricker Ernst
- 👤 Schmidt Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:11
CPC Classifications
C; C08; C08G; C08G2/00; C08G2/28; C08K; C08K3/00; C08K3/16
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
METHOD FOR WORKING UP POLYACETALS SELECTED FROM THE GROUP CONSISTING OF A SOLID POLYOXYMETHYLENE HOMOPOLYMER AND COPOLYMERS HAVING MELTING POINTS ABOVE 150* C. AND HAVING POLYMER CHAINS CONTAINING (A) 80 TO 999 MOL PERCENT OF -OCH2- UNITS INTERPERSED WITH (B) 0.1 TO 20 MOL PERCENT OF -O-R- UNITS IN WHICH R IS A DIVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS DIRECTLY LINKED TO EACH OTHER AND POSITIONED IN THE POLYMER CHAIN BETWEEN THE TWO VALENCES OF R, ANY SUBSTITUENTS IN R BEING INERT, SAID POLYACETALS CONTAINING THEREIN A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND A BORON TRIFLUORIDE COODINATION COMPLEX, SAID METHOD COMPRISING (A) ADDING FROM 0.01 TO 5% BY WEIGHT OF A NEUTRAL METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF LITHIUM FLUORIDE, LITHIUM CHLORIDE, SODIUM FLUORIDE SODIUM CHLORIDE, POTASSIUM FLUORIDE, POTASSIUM CHLORIDE CALCIUM FLUORIDE, STRONTIUM FLUORIDE AND BARIUM FLUORIDE, AND (B) MELTING AND HOMOGENIZING THE RESULTING COMPOSITION.
Claim 2
Dependent Claim
153 words
METHOD FOR WORKING UP POLYACETALS SELECTED FROM THE GROUP CONSISTING OF A SOLID POLYOXYMETHYLENE HOMOPOLYMER AND COPOLYMERS HAVING MELTING POINTS ABOVE 150* C. AND HAVING POLYMER CHAINS CONTAINING (A) 80 TO 999 MOL PERCENT OF -OCH2- UNITS INTERPERSED WITH (B) 0.1 TO 20 MOL PERCENT OF -O-R- UNITS IN WHICH R IS A DIVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS DIRECTLY LINKED TO EACH OTHER AND POSITIONED IN THE POLYMER CHAIN BETWEEN THE TWO VALENCES OF R, ANY SUBSTITUENTS IN R BEING INERT, SAID POLYACETALS CONTAINING THEREIN A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND A BORON TRIFLUORIDE COODINATION COMPLEX, SAID METHOD COMPRISING (A) ADDING FROM 0.01 TO 5% BY WEIGHT OF A NEUTRAL METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF LITHIUM FLUORIDE, LITHIUM CHLORIDE, SODIUM FLUORIDE SODIUM CHLORIDE, POTASSIUM FLUORIDE, POTASSIUM CHLORIDE CALCIUM FLUORIDE, STRONTIUM FLUORIDE AND BARIUM FLUORIDE, AND (B) MELTING AND HOMOGENIZING THE RESULTING COMPOSITION.
Claim 3
Dependent Claim
152 words
POLYACETALS SELECTED FROM THE GROUP CONSISTING OF A SOLID POLYOXYMETHYLENE HOMOPOLYMER AND COPOLYMERS HAVING MELTING POINTS ABOVE 150*C. AND HAVING POLYMER CHAINS CONTAINING (A) 80 TO 99.9 MOL PERCENT OF -CHO2- UNITS INTERSPERSED WITH (B) 0.1 TO 20 MOL PERCENT OF -0-R- UNITS IN WHICH R IS A DIVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS DIRECTELY LINKED TO EACH OTHER AND POSITIONED IN THE POLYMER CHAIN BETWEEN THE TWO VALENCES OF R, ANY SUBSTITUENTS IN R BEING INERT, SAID POLYACETALS CONTAINING THEREIN A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND A BORON TRIFLUORIDE COORDINATION COMPLEX AND WORKED UP BY A METHOD COMPRISING (A) ADDING FROM 0.01 TO 5% BY WEIGHT OF A NEUTRAL METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF LITHIUM FLUORIDE, LITHIUM CHLORIDE, SODIUM FLUORIDE SODIUM CHLORIDE, POTASSIUM FLUORIDE, POTASSIUM CHLORIDE, CALCIUM FLUORIDE, STRONTIUM FLUORIDE AND BORIUM FLUORIDE, AND (B) MELTING AND HOMOGENIZING THE RESULTING COMPOSITION.
Claim 4
Dependent Claim
152 words
POLYACETALS SELECTED FROM THE GROUP CONSISTING OF A SOLID POLYOXYMETHYLENE HOMOPOLYMER AND COPOLYMERS HAVING MELTING POINTS ABOVE 150*C. AND HAVING POLYMER CHAINS CONTAINING (A) 80 TO 99.9 MOL PERCENT OF -CHO2- UNITS INTERSPERSED WITH (B) 0.1 TO 20 MOL PERCENT OF -0-R- UNITS IN WHICH R IS A DIVALENT RADICAL CONTAINING AT LEAST TWO CARBON ATOMS DIRECTELY LINKED TO EACH OTHER AND POSITIONED IN THE POLYMER CHAIN BETWEEN THE TWO VALENCES OF R, ANY SUBSTITUENTS IN R BEING INERT, SAID POLYACETALS CONTAINING THEREIN A CATALYST SELECTED FROM THE GROUP CONSISTING OF BORON TRIFLUORIDE AND A BORON TRIFLUORIDE COORDINATION COMPLEX AND WORKED UP BY A METHOD COMPRISING (A) ADDING FROM 0.01 TO 5% BY WEIGHT OF A NEUTRAL METAL HALIDE SELECTED FROM THE GROUP CONSISTING OF LITHIUM FLUORIDE, LITHIUM CHLORIDE, SODIUM FLUORIDE SODIUM CHLORIDE, POTASSIUM FLUORIDE, POTASSIUM CHLORIDE, CALCIUM FLUORIDE, STRONTIUM FLUORIDE AND BORIUM FLUORIDE, AND (B) MELTING AND HOMOGENIZING THE RESULTING COMPOSITION.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |