US3671482A
Expired / Lapsed
US
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Polymer solutions of polyamino acids and the process for their preparation
Assignee: KYAVA HAKKO KOGYO CO Ltd
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Filing: 1969-04-03
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Granted: 1972-06-20
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Expires: 1989-04-03
Abstract
Abstract The present disclosure is directed to a polymer solution and a process for preparing the same which comprises a polyamino acid or polyamino acid ester and a solvent for said polymer, said solvent including at least one N-containing heterocyclic compound selected from the group consisting of: WHEREIN X IS AN INTEGER OF 2 TO 4, Y AND Z ARE INTEGERS, INCLUDING ZERO, WHICH SATISFY THE FORMULA Y+Z<6, AND R is hydrogen, an alkyl group having about one to eight carbon atoms, a phenyl group or a tolyl group, including those having one to three substituents selected from the group consisting of halogen and nitro.
Inventors
- 👤 Yasuo Fujimoto
- 👤 Koichi Nagaoka
- 👤 Keizo Tatsukawa
- 👤 Yoichi Koiwa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:35
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08J3/096; C08J2377/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
14 words
The polymer solution of claim 1, wherein the polymer has an Alpha -helical configuration.
Claim 2
Dependent Claim
18 words
The polymer solution of claim 1, wherein the polyamino acids have a Beta -chain or a random-coil configuration.
Claim 3
Dependent Claim
34 words
The polymer solution of claim 1, wherein the polymer is are selected from the group consisting of homopolymers, copolymers, block copolymers and polymer blends of the L-, D- or DL-amino acids and esters thereof.
Claim 4
Dependent Claim
56 words
The polymer solution of claim 4, wherein the amino acids and esters thereof are selected from the group consisting of the Beta -monoester of aspartic acid, the gamma -monoester of glutamic acid, O-substituted serine, O-substituted threonine alanine, methionine, N -substituted lysine, N -substituted ornithine, Nguanido-substituted arginine, isoleucine, leucine, tyrosine, tryptophan, Beta -alanine and Beta -aminobutyric acid.
Claim 5
Dependent Claim
23 words
The polymer solution of claim 1, wherein the solvent is selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, 2-pyrrolidone, morpholine and N-methyl morpholine.
Claim 6
Dependent Claim
42 words
The polymer solution of claim 1, wherein the polymer is selected from the group consisting of poly- gamma -methyl-glutamate, poly- gamma -ethyl-glutamate, poly- gamma -benzyl-glutamate, poly-alanine, a copolymer of gamma -methyl-glutamate and gamma -butyl-glutamate and a copolymer of alanine and gamma -methyl-glutamate.
Claim 7
Dependent Claim
16 words
The polymer solution of claim 1, wherein the polymer has a molecular weight of about 100,000-300,000.
Claim 8
Dependent Claim
21 words
The polymer solution of claim 1, wherein the polymer is present in an amount of about 5- 20 percent by weight.
Claim 9
Dependent Claim
81 words
A polymer solution which comprises a polyamino acid or a polyamino acid ester and a solvent for said polymer consisting essentially of at least one member selected from the group consisting of: wherein x is an integer of 2 to 4, and y and z are integers, including zero, which satisfy the formula y + z <6, and R is hydrogen, methyl or ethyl, the amount of polymer is said solution being sufficient to provide a satisfactory spinning or film-forming solution.
Claim 10
Dependent Claim
23 words
The polymer solution of claim 10, wherein the solvent is selected from the group consistiNg of N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, 2-pyrrolidone, morpholine and N-methyl morpholine.
Claim 11
Dependent Claim
40 words
The polymer solution of claim 11, wherein the polymer is selected from the group consisting of poly- gamma -methyl-glutamate, poly- gamma -ethyl-glutamate, poly-2-benzyl-glutamate, polyalanine, a copolymer of gamma -methyl-glutamate and gamma -butyl-glutamate and a copolymer of alanine and gamma -methyl-glutamate.
Claim 12
Dependent Claim
22 words
The polymer solution of claim 12, wherein about 5 to 20 percent by weight of said polymer is present in the solution.
Claim 13
Dependent Claim
18 words
The polymer solution of claim 13, wherein the polymer has a molecular weight of about 100,000 to 300,000.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |