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US4297480A Expired / Lapsed US ⏱️ 0.0 years remaining

Transparent polyamide from branched chain C11 diamine

Assignee: BASF Corp
•
Filing: 1979-10-09
•
Granted: 1981-10-27
•
Expires: 1999-10-09
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Abstract

Abstract There are described transparent polyamides, and processes for producing them, which polyamides consist of recurring structural elements of the formula I ##STR1## or of recurring structural elements of the formula II ##STR2## [carbonyl groups in the structural elements (II) bound in the 1,3- and/or 1,4-position to the benzene nucleus, R 1 =C 1-12 -alkyl, R 2 =H, C 1-12 -alkyl, R 3 =C 1-12 -alkyl, C 4-12 -cycloalkyl, C 7-8 -aralkyl, unsubstituted or substituted aryl, R 4 =H, C 1-12 -alkyl, C 4-12 -cycloalkyl, C 7-8 -aralkyl, or unsubstituted or substituted aryl, or R 3 /R 4 together=C 3-11 -alkylene, R 5 /R 6 independently of one another=hydrogen or methyl, and R 7 /R 8 together=C 3-11 -alkylene]. The polyamides according to the invention are suitable for producing transparent moulded articles of the widest variety, and are distinguished in particular by low water absorption, high stability to hydrolysis, and/or good dimensional stability under the action of moisture or humidity.

Inventors

  • 👤 Josef Pfeifer
  • 👤 Dieter Reinehr

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-04 02:07
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 86 words
A transparent polyamide having a reduced specific viscosity of at least0.5 dl/g, measured on a 0.5% solution in m-cresol at 25° C., which polyamide consists of recurring structural elements of formula Ia ##STR14## wheren R 1 ' and R 2 ' are each methyl or ethyl, or together are alkylene having 4-7 C atoms, R 3 ' is methyl or ethyl, and R 4 ' is alkyl having 1-4 C atoms, or R 3 ' and R 4 ' together are alkylene having 4-7 C atoms.
Claim 2
Dependent Claim 86 words
A transparent polyamide having a reduced specific viscosity of at least0.5 dl/g, measured on a 0.5% solution in m-cresol at 25° C., which polyamide consists of recurring structural elements of formula Ia ##STR14## wheren R 1 ' and R 2 ' are each methyl or ethyl, or together are alkylene having 4-7 C atoms, R 3 ' is methyl or ethyl, and R 4 ' is alkyl having 1-4 C atoms, or R 3 ' and R 4 ' together are alkylene having 4-7 C atoms.
Claim 3
Dependent Claim 48 words
A polyamide according to claim 1, wherein R 1 ', R 2 ', R 3 ' and R 4 ' are each ethyl, or wherein R 1 ' and R 2 ' as well as R 3 ' and R 4 ' together are in each case pentamethylene.
Claim 4
Dependent Claim 18 words
A transparent polyamide as claimed in claim 1 which consists of recurring structural units having the formula ##STR15##
Claim 5
Dependent Claim 18 words
A transparent polyamide as claimed in claim 1 which consists of recurring structural units having the formula ##STR16##
Claim 6
Dependent Claim 18 words
A transparent polyamide as claimed in claim 1 which consists of recurring structural units having the formula ##STR17##

References Cited (Backward Citations)

US2277125A Cited
US3145193A Cited
US3150117A Cited
US3150113A Cited
US3563959A Cited
GB1251520A Cited
US3706802A Cited
US3939147A Cited
US4210742A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1984-10-26 1985-04-27 1985-10-27 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1988-10-26 1989-04-27 1989-10-27 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1992-10-26 1993-04-27 1993-10-27 $7700.00 Window Closed / Lapsed

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