Patent US4446304A successfully refreshed from Google Patents.
US4446304A
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Highly stable nylon 4,6 objects
Assignee: DSM BV
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Filing: 1982-12-20
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Granted: 1984-05-01
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Expires: 2002-12-20
Abstract
Abstract Shaped articles are described molded from a nylon 4,6 polyamide, substantially consisting of [NH--(CH 2 ) 4 --NH--CO(CH 2 ) 4 --CO] units and having a relative viscosity, measured at 20° C., on a solution in 96% sulfuric acid containing 1 g of polyamide in 100 ml of solution, of at least 2.0, and having highly stable high temperature, zinc-ion and chloride ion resistance characteristics.
Inventors
- 👤 Reinoud J. Gaymans
- 👤 Pieter J. Van Asperen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:24
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/24; C; C08; C08G; C08G69/00; C08G69/48; B29K; B29K2077/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
90 words
A shaped article formed by compression or injection molding a melt of a polyamide, consisting essentially of a molecular chain of units of --NH--(CH.sub.2).sub.4 --NH--CO(CH.sub.2).sub.4 --CO-- and which polyamide in the molded article has a relative viscosity of at least 2.5, measured at 20° C., on a solution in 96% sulfuric acid, containing 1 g of polyamide in 100 ml of solution, and which article has a heat distortion temperature value of at least 100° C., and an IZOD impact resistance value of at least 5 kilojoules per square meter.
Claim 2
Dependent Claim
90 words
A shaped article formed by compression or injection molding a melt of a polyamide, consisting essentially of a molecular chain of units of --NH--(CH.sub.2).sub.4 --NH--CO(CH.sub.2).sub.4 --CO-- and which polyamide in the molded article has a relative viscosity of at least 2.5, measured at 20° C., on a solution in 96% sulfuric acid, containing 1 g of polyamide in 100 ml of solution, and which article has a heat distortion temperature value of at least 100° C., and an IZOD impact resistance value of at least 5 kilojoules per square meter.
Claim 3
Dependent Claim
14 words
Article according to claim 1, wherein said relative viscosity is from 3 to 5.
Claim 4
Dependent Claim
21 words
Article according to claim 1, molded at a temperature of between 290 and 330° C., with exclusion of oxygen and moisture.
Claim 5
Dependent Claim
16 words
Article according to claim 1 wherein said polyamide is a homopolyamide of 1,4-butanediamine with adipic acid.
Claim 6
Dependent Claim
13 words
Article according to claim 2, wherein said IZOD value is at least 7.5.
Claim 7
Dependent Claim
100 words
A process for the production of shaped articles made from the melt of a polyamide, which comprises compression or injection molding a nylon 4,6 polyamide consisting essentially of a molecular chain of repeating units of --NH--(CH.sub.2).sub.4 --NH--CO--(CH.sub.2).sub.4 --CO-- and which polyamide in the molded article has a relative viscosity of at least 2.5, measured at 20° C. on a solution in 96% sulfuric acid containing 1 g of polyamide in 100 ml of solution and has a heat distortion temperature value of at least 95° C. and an IZOD impact resistance value of at least 5 kilojoules per square meter.
Claim 8
Dependent Claim
100 words
A process for the production of shaped articles made from the melt of a polyamide, which comprises compression or injection molding a nylon 4,6 polyamide consisting essentially of a molecular chain of repeating units of --NH--(CH.sub.2).sub.4 --NH--CO--(CH.sub.2).sub.4 --CO-- and which polyamide in the molded article has a relative viscosity of at least 2.5, measured at 20° C. on a solution in 96% sulfuric acid containing 1 g of polyamide in 100 ml of solution and has a heat distortion temperature value of at least 95° C. and an IZOD impact resistance value of at least 5 kilojoules per square meter.
Claim 9
Dependent Claim
14 words
Process according to claim 6, wherein said relative viscosity is from 3 to 5.
Claim 10
Dependent Claim
28 words
Process according to claim 6, wherein said polyamide is formed into said shaped article at a temperature of between 290° and 330° C., while excluding oxygen and moisture.
Claim 11
Dependent Claim
16 words
Process according to claim 6 wherein said polyamide is a homopolyamide of 1,4-butanediamine with adipic acid.
Claim 12
Dependent Claim
13 words
Process according to claim 7, wherein said IZOD value is at least 7.5.
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) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |