Patent US4851996A successfully refreshed from Google Patents.
US4022752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tough polybutylene terephthalate molding compositions showing good thermo-aging stability and processing stability
Assignee: BASF SE
•
Filing: 1975-04-14
•
Granted: 1977-05-10
•
Expires: 1995-04-14
Abstract
Abstract Thermoplastic molding compositions based on polybutylene terephthalate having a relative viscosity of from 1.3 to 2.0, as measured in a phenol/o-dichlorobenzene mixture at 25° C, and which contain, to increase the thermo-aging stability and toughness and also to improve the processing stability, from 0.1 to 10% by weight, based on the polybutylene terephthalate, of isocyanates or isothiocyanates and/or carbodiimides and/or compounds forming isocyanate groups or isothiocyanate groups and/or carbodiimide groups.
Inventors
- 👤 Peter Horn
- 👤 Rolf Wurmb
- 👤 Dietrich Wolff
- 👤 Wolfgang Seydl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:48
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/42; C08G18/4205; C08G18/4208; C08G18/4211; C08G18/4213; C08G18/70; C08G18/72; C08G18/77; C08G18/78; C08G18/79; C08G18/797; C08G18/798; C08K5/29; C08K5/36; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L27/00; C08L27/02; C08L27/12; C08L27/18; C08L33/00; C08L61/00; C08L61/02; C08L67/00; C08L67/02; C08L69/00; C08L75/00; C08L75/04; C08L77/00; C08L79/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
60 words
Tough polybutylene terephthalate molding compositions showing good thermo-aging and processing stabilities and having a relative viscosity of from 1.3 to 2.0, as measured in a mixture of phenol/o-dichlorobenzene at 25° C, said compositions comprising: polybutylene terephthalate and from 0.01 to 10% by weight, based on the polybutylene terephthalate, of adducts of isocyanates with OH--, NH--, CH--, or SH-- acidic compounds.
Claim 2
Dependent Claim
60 words
Tough polybutylene terephthalate molding compositions showing good thermo-aging and processing stabilities and having a relative viscosity of from 1.3 to 2.0, as measured in a mixture of phenol/o-dichlorobenzene at 25° C, said compositions comprising: polybutylene terephthalate and from 0.01 to 10% by weight, based on the polybutylene terephthalate, of adducts of isocyanates with OH--, NH--, CH--, or SH-- acidic compounds.
Claim 3
Dependent Claim
23 words
Polybutylene terephthalate molding compositions as claimed in claim 1, wherein the isocyanate-forming compound is the adduct of toluylene-2,4-diisocyanate with phenol or o-chloro phenyl.
Claim 4
Dependent Claim
28 words
Tough polybutylene terephthalate molding compositions showing good thermo-aging and processing stabilities as claimed in claim 1, wherein the isocyanate-forming compound is the adduct of 1,6-hexamethylene diisocyanate with ε-caprolactam.
Claim 5
Dependent Claim
80 words
Polybutylene terephthalate molding compositions as claimed in claim 1 and containing from 3 to 15% by weight, based on the weight of polymers, of an organic halogen, phosphorus or nitrogen compound which is stable under the melt-processing conditions, either alone or in combination with from 2 to 10% by weight, based on the weight of polymers, of a synergistic metal compound, preferably antimony trioxide, and/or 2 to 12% by weight, based on the weight of polymers, of elementary red phosphorus.
Claim 6
Dependent Claim
28 words
Polybutylene terephthalate molding compositions as claimed in claim 1 and containing from 0.01 to 5% by weight, based on the polymer matrix, of phenolic antioxidants or amine antioxidants.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |