US4386178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyacetals having an improved maximum sustained-use temperature
Assignee: BASF SE
•
Filing: 1981-10-28
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Granted: 1983-05-31
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Expires: 2001-10-28
Abstract
Abstract Polyacetal molding materials which contain, as a stabilizer, from 0.1 to 10% by weight of a melamine resin, the latter being a melamine-formaldehyde condensate, having a mean degree of polymerization of from 1.2 to 6.0 and a melamine:formaldehyde ratio of from 1:2 to 1:5.5, which has been partially etherified with a C 1 -C 4 -alkanol so that the ratio melamine:ether radicals is from 1:1.5 to 1:5.0 and the ratio melamine:free methylol groups is from 1:0.5 to 1:3. The molding materials can be converted to moldings which can be used industrially at elevated ambient temperatures.
Inventors
- 👤 Wilhelm Schuette
- 👤 Albrecht Hilt
- 👤 Manfred Walter
- 👤 Klaus Boehlke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:10
CPC Classifications
C; C08; C08G; C08G12/00; C08G12/02; C08G12/40; C08G12/42; C08L; C08L59/00; C08L59/02; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A polyacetal molding material containing an antioxidant and a heat stabilizer, which molding material is further stabilized with a melamine resin, which molding material contains from 0.1 to 10% by weight of a melamine-formaldehyde condensate which has a mean degree of polymerization of from 1.2 to 6.0 and a melamine:formaldehyde ratio of from 1:2 to 1:5.5 and which is partially etherified with a C 1 -C 4 -alkanol so that the ratio melamine:ether radicals is from 1:1.5 to 1:5.0 and that the ratio melamine:free methylol groups is from 1:0.5 to 1:3.
Claim 2
Dependent Claim
91 words
A polyacetal molding material containing an antioxidant and a heat stabilizer, which molding material is further stabilized with a melamine resin, which molding material contains from 0.1 to 10% by weight of a melamine-formaldehyde condensate which has a mean degree of polymerization of from 1.2 to 6.0 and a melamine:formaldehyde ratio of from 1:2 to 1:5.5 and which is partially etherified with a C 1 -C 4 -alkanol so that the ratio melamine:ether radicals is from 1:1.5 to 1:5.0 and that the ratio melamine:free methylol groups is from 1:0.5 to 1:3.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-30 | 1986-11-29 | 1987-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-30 | 1990-11-29 | 1991-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-30 | 1994-11-29 | 1995-05-31 | $7700.00 | Window Closed / Lapsed |