US4892927A
Expired / Lapsed
US
⏱️ 0.0 years remaining
α-amino-ε-caprolactam-modified polyamide of dicarboxylic acids/diamines
Assignee: Bayer AG
•
Filing: 1988-04-18
•
Granted: 1990-01-09
•
Expires: 2008-04-18
Abstract
Abstract This invention relates to thermoplastically deformable, high molecular weight, slightly branched aliphatic polyamides prepared by the polycondensation of polyamide-forming, aliphatic diamine/dicarboxylic acid mixtures, optionally with the addition of lactams and special amino acids, in the presence of small quantities of α-amino-ε-caprolactam, and optionally their thermal solid phase after-condensation.
Inventors
- 👤 Rolf-Volker Meyer
- 👤 Rolf Dhein
- 👤 Michael Dietrich
- 👤 Heinz Bonten
- 👤 Hans-Detlef Heinz
- 👤 Peter-Rolf Muller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:04
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/28; C08G69/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
54 words
A process for the preparation of aliphatic (co)polyamide by the polycondensation of polyamide-forming, predominantly aliphatic diamine and dicarboxylic acid or salts thereof or polyamide forming amino acid, with or without ω-lactams, characterised in that from 0.02 to 1% by weight of α-amino -ε-caprolactam (ACL) is added to the polyamide forming mixture which is polymerised.
Claim 2
Dependent Claim
54 words
A process for the preparation of aliphatic (co)polyamide by the polycondensation of polyamide-forming, predominantly aliphatic diamine and dicarboxylic acid or salts thereof or polyamide forming amino acid, with or without ω-lactams, characterised in that from 0.02 to 1% by weight of α-amino -ε-caprolactam (ACL) is added to the polyamide forming mixture which is polymerised.
Claim 3
Dependent Claim
25 words
A process according to claim 1, characterised in that a quantity of polycarboxylic acid approximately equivalent to the αamino group in the α-amino-ε-caprolactam is added.
Claim 4
Dependent Claim
24 words
A process according to claim 1, characterised in that α-amino-ε-caprolactam is added to the monomer mixture before or at the beginning of the polycondensation.
Claim 5
Dependent Claim
31 words
A process according to claim 1 wherein polycondensation is at a reduced melt polycondensation time amounting to less than half that conventionally required for ACL-free (co)polyamides at the given polycondensation temperature.
Claim 6
Dependent Claim
31 words
A process according to claim 1, characterised in that polycondensation times in the melt of from 0.1 to 3 hours are employed at polycondensation temperatures in the melt of >200° C.
Claim 7
Dependent Claim
40 words
A process according to claim 1 wherein the polycondensation is followed by an after-condensation in the solid phase whereby polyamide is formed with increased solution viscosity and melt viscosity which has a branched structure but is still soluble in cresol.
Claim 8
Dependent Claim
78 words
A process according to claim 6, characterised in that the solid phase after-condensation of the ACLmodified (co)polyamide is carried out continuously or discontinuously at a temperature from 140° to 240° C., but always at least 10 deg. cent. below the melting point of the given polyamide and in that the reaction time is chosen in the range of from a few minutes to about 30 hours, the longer reaction times being employed especially at the lower reaction temperatures.
Claim 9
Dependent Claim
50 words
A process according to claim 1 wherein the diamine is hexamethylene diamine, trimethylhexamethylene diamine or mixture thereof, the dicarboxylic acid is adipic acid, azelaic acid, sebacic acid, dodecane diacid, or mixture thereof and the amino acid is 11-aminoundecanoic acid or 6-aminohexanoic acid and the lactam is ε-caprolactam or lauryl lactam.
Claim 10
Dependent Claim
22 words
A process according to claim 1 wherein from 0.1 to 0.6% by weight of α-amino-ε-caprolactam is added to the polyamide forming mixture.
Claim 11
Dependent Claim
16 words
A process according to claim 5 wherein the polycondensation temperature is from 220° to 285° C.
Claim 12
Dependent Claim
37 words
A process according to claim 7 wherein the after-condensation is at 150° to 230° C. but always at least 20 deg. cent. below the melting point of the polyamide for a time of 0.5 to 20 hours.
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) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |