US4469834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Poly(butylene terephthalate) based molding resins
Assignee: Celanese Corp
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Filing: 1983-05-11
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Granted: 1984-09-04
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Expires: 2003-05-11
Abstract
Abstract There is provided an improved molding resin capable of being molded into an article exhibiting reduced tendency to corrode a copper surface when the molded resin and the copper surface are placed in spaced relationship in a common unventilated atmosphere at elevated temperatures, as measured by the Bell Telephone Laboratories Copper Corrosion Test at temperatures within the range of from 150° to 175° C., wherein the molding resin comprises the combination of (a) a poly(butylene terephthalate) based polymer and aromatic halogen groups in a flame retardant amount, and (b) an alkylhydroxyphenylalkanoyl-hydrazine in an amount that is within the range of from 0.05 to 0.6% by weight, based on the weight of the molding resin, and less than 0.8% by weight based on the polymer.
Inventors
- 👤 Wilfred L. Shearer
- 👤 Stephen M. Sinker
- 👤 Richard A. Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:43
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/02; C08K5/03; C08K5/16; C08K5/22; C08K5/24; C08K5/25
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A flame retardant molding resin capable of being molded into an article exhibiting reduced tendency to corrode a copper surface when the molded resin and the copper surface are placed in spaced relationship in a common unventilated atmosphere at elevated temperatures, as measured by the Bell Telephone Laboratories Copper Corrosion Test at temperaures within the range of from 150° to 175° C., wherein the molding resin comprises the combination of (a) a poly(butylene terephthalate) polymer and (b) a flame retardant comprising aromatic halogen groups in a flame retardant amount, and (c) an alkylhydroxyphenylalkanoyl-hydrazine in an amount that is within the range of from 0.05 to 0.6% by weight, based on the weight of the molding resin, and less than 0.8% by weight based on the polymer; and wherein the molding resin has a life of at least 168 hours at 150° C. as measured by the Bell test based on 4 samples.
Claim 2
Dependent Claim
152 words
A flame retardant molding resin capable of being molded into an article exhibiting reduced tendency to corrode a copper surface when the molded resin and the copper surface are placed in spaced relationship in a common unventilated atmosphere at elevated temperatures, as measured by the Bell Telephone Laboratories Copper Corrosion Test at temperaures within the range of from 150° to 175° C., wherein the molding resin comprises the combination of (a) a poly(butylene terephthalate) polymer and (b) a flame retardant comprising aromatic halogen groups in a flame retardant amount, and (c) an alkylhydroxyphenylalkanoyl-hydrazine in an amount that is within the range of from 0.05 to 0.6% by weight, based on the weight of the molding resin, and less than 0.8% by weight based on the polymer; and wherein the molding resin has a life of at least 168 hours at 150° C. as measured by the Bell test based on 4 samples.
Claim 3
Dependent Claim
12 words
A resin of claim 1 in the form of a molded article.
Claim 4
Dependent Claim
93 words
A resin of claim 1, wherein the alkylhydroxyphenyalkanoyl-hydrazine is represented by the formula: ##STR1## wherein R 1 is a lower alkyl group containing from 1 to 6 carbon atoms, R 2 is selected from the group consisting of hydrogen and lower alkyl containing from 1 to 6 carbon atoms, R 3 is selected from the group consisting of hydrogen, alkanoyl containing from 2 to 18 carbon atoms and a group represented by the formula: ##STR2## wherein R 1 and R 2 are defined above and n is a number from 0 to 5.
Claim 5
Dependent Claim
15 words
A resin of claim 3 wherein the alkylhydroxyphenylalkanoyl-hydrazine is represented by the following structure: ##STR3##
Claim 6
Dependent Claim
42 words
A resin of claim 3, wherein the alkylhydroxyphenylalkanoyl-hydrazine is N-N'-bis[3-(3,5-di t-butyl-4-hydroxy phenyl propionyl)]-hydrazine and is present in an amount of less than 0.4% by weight based on the molding resin, and less than 0.5% by weight based on the poly(butylene terephthalate) polymer.
Claim 7
Dependent Claim
21 words
A resin of claim 5, which comprises less than 0.2% by weight of a phenolic antioxidant that is free of nitrogen.
Claim 8
Dependent Claim
18 words
A resin of claim 6, which comprises the absence of a phenolic antioxidant that is free of nitrogen.
Claim 9
Dependent Claim
68 words
A resin of claim 5, which comprises poly(1,4-butylene terephthalate) polymer having an intrinsic viscosity within the range of from 0.7 to 1.1 dl/gm and decabromo diphenyl oxide in an amount of from 3 to 10 percent by weight based on the molding resin and alkylhydroxyphenylalkanoyl-hydrazine in an amount that is within the range of from 0.05 to 0.3% by weight, based on the weight of the molding resin.
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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) | 1987-09-04 | 1988-03-05 | 1988-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-04 | 1992-03-05 | 1992-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-04 | 1996-03-05 | 1996-09-04 | $7700.00 | Window Closed / Lapsed |