Patent US4847333A successfully refreshed from Google Patents.
US4847333A
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Blended polyamide oligomers
Assignee: Boeing Co
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Filing: 1987-05-18
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Granted: 1989-07-11
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Expires: 2007-05-18
Abstract
Abstract Crosslinking polyamide oligomers are mixed with comparable, noncrosslinking, polyamide to provide solvent-resistant blends that are particularly suited for aerospace uses. Generally, the blend comprises an equimolar mixture of the linear or multidimensional oligomer and a polymer having substantially an identical backbone and substantially the same average formula weight as the oligomer. Prepregs and composites of the blends can easily be prepared.
Inventors
- 👤 Hyman R. Lubowitz
- 👤 Clyde H. Sheppard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:36
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/42; C08J; C08J5/00; C08J5/24; C08J5/241; C08J5/243; C08K; C08K7/00; C08K7/02; C08L; C08L77/00; C08J2377/00; Y; Y10; Y10S; Y10S525/00; Y10S525/903; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/2964; Y10T428/2967; Y10T428/2969
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
167 words
An oligomer blend comprising a mixture of a crosslinkable, polyamide oligomer of the general formula: E--CONH--P--NHCO--Q--CONH--P--NHCO--.sub.m E; E--NHCO--Q--CONH--P--NHCO--Q--CONH--.sub.m E; Ar--(CONH--P--NHCO--Q--CONH--E].sub.n ; AR--NHCO--Q--COHN--P--NHCO--E].sub.n ; AR--CONH--E].sub.n ; AR--NHCO--E].sub.n ; AR--CONH--P--NHCO--E].sub.n ; or Ar--NHCO--Q--CONH--E].sub.n and a comparable polymer that is incapable of crosslinking and that has an identical or substantially identical backbone to the oligomer so that the polymer and oligomer are compatible in a solution prior to sweeping out in a prepreg, wherein m=a small integer; E=a residue of a crosslinkable end cap to improve the solvent resistance of the cured oligomer in an advanced composite, and is selected from the group consisting of: ##STR36## R 1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof, wherein the substituents are selected from OH or halogen; j=0, 1, or 2; i=1 or 2; G=--CH 2 --, --O--, --S--, or --SO 2 --; Me=methyl; T=allyl or methallyl; P and Q=linear residues or respective diamines (P) and diacid halides (Q); n=3 or 4; and Ar=an aromatic moiety.
Claim 2
Dependent Claim
167 words
An oligomer blend comprising a mixture of a crosslinkable, polyamide oligomer of the general formula: E--CONH--P--NHCO--Q--CONH--P--NHCO--.sub.m E; E--NHCO--Q--CONH--P--NHCO--Q--CONH--.sub.m E; Ar--(CONH--P--NHCO--Q--CONH--E].sub.n ; AR--NHCO--Q--COHN--P--NHCO--E].sub.n ; AR--CONH--E].sub.n ; AR--NHCO--E].sub.n ; AR--CONH--P--NHCO--E].sub.n ; or Ar--NHCO--Q--CONH--E].sub.n and a comparable polymer that is incapable of crosslinking and that has an identical or substantially identical backbone to the oligomer so that the polymer and oligomer are compatible in a solution prior to sweeping out in a prepreg, wherein m=a small integer; E=a residue of a crosslinkable end cap to improve the solvent resistance of the cured oligomer in an advanced composite, and is selected from the group consisting of: ##STR36## R 1 =lower alkyl, lower alkoxy, aryl, aryloxy, substituted alkyl, substituted aryl, halogen, or mixtures thereof, wherein the substituents are selected from OH or halogen; j=0, 1, or 2; i=1 or 2; G=--CH 2 --, --O--, --S--, or --SO 2 --; Me=methyl; T=allyl or methallyl; P and Q=linear residues or respective diamines (P) and diacid halides (Q); n=3 or 4; and Ar=an aromatic moiety.
Claim 3
Dependent Claim
22 words
The blend of claim 1 wherein the backbone of the comparable polymer is substantially identical to the backbone of the crosslinking oligomer.
Claim 4
Dependent Claim
26 words
The blend of claim 2 wherein the comparable polymer is capped with an aromatic compound selected from the group consisting of aniline or ##STR37## wherein X=halogen
Claim 5
Dependent Claim
16 words
The blend of claim 2 wherein the crosslinkable oligomer and comparable polymer have substantially linear backbones.
Claim 6
Dependent Claim
17 words
The blend of claim 1 wherein the mixture comprises substantially equimolar amounts of the oligomer and polymer.
Claim 7
Dependent Claim
17 words
A prepreg comprising the blend of claim 1, and a reinforcing additive in fiber or particulate form.
Claim 8
Dependent Claim
9 words
A composite comprising a cured prepreg of claim 2.
Claim 9
Dependent Claim
9 words
A composite comprising a cured blend of claim 1.
Claim 10
Dependent Claim
17 words
The blend of claim 1 wherein the oligomer has the general formula: E--CONH--P--NHCO--Q--CONH--P--NHCO--.sub.m E; or E--NHCO--Q--CONH--P--NHCO--Q--CONH--.sub.m E;
Claim 11
Dependent Claim
97 words
The blend of claim 1 wherein the diamine (P) and diacid halide (Q) are each selected from the group consisting of: ##STR38## wherein q=-- SO 2 --, --CO--, --S--, or --(CF 3 ) 2 C--, and preferably --SO 2 -- or --CO--; Me=methyl; m=an integer, generally less than 5, and preferably 0 or 1; D=any of --CO--, --SO 2 --, or --(CF 3 ) 2 C--; A=--NH 2 or --COX; B=--NH 2 if A=--NH 2 , and --COX, if A=--COX; X=halogen; and ##STR39## R 1 =a C 2 to C 12 divalent aliphatic, aclicyclic, or aromatic radical.
Claim 12
Dependent Claim
43 words
The blend of claim 1 wherein at least one of the oligomer or polymer includes a conductive linkage selected from the group consisting of Schiff base (----CH═N----), oxazole, thiazole, and imidazole linkages to impart semiconductive or conductive properties to a suitably doped composite.
Claim 13
Dependent Claim
14 words
The blend of claim 11 further comprising a sufficient amount of a suitable dopant.
Claim 14
Dependent Claim
74 words
The blend of claim 12 wherein the linkage is a Schiff base linkage so that at least one of the oligomer or polymer includes a radical selected from the group consisting of: ##STR40## wherein R=an aromatic moiety or a short aryl chain including a plurality of aryl moieties linked with any of --CH 2 --, --SO 2 --, --S--, --O--, --CO--, --(CH 3 ) 2 C--, or --(CF 3 ) 2 C--; and q=0-4.
Claim 15
Dependent Claim
14 words
The blend of claim 13 wherein the oligomer and polymer have substantially identical backbones.
Claim 16
Dependent Claim
17 words
A prepreg comprising the blend of claim 12 and a reinforcing additive in fiber or particulate form.
Claim 17
Dependent Claim
9 words
A composite comprising a cured blend of claim 12.
Claim 18
Dependent Claim
7 words
The blend of claim 1 where i=2.
Claim 19
Dependent Claim
30 words
The blend of claim 17 wherein the oligomer has the general formula: E--CONH--P--NHCO--Q--CONH--P--NHCO--.sub.m E; E--NHCO--Q--CONH--P--NHCO--Q--CONH--.sub.m E; and wherein the polymer has a substantially identical backbone to that of the oligomer.
Claim 20
Dependent Claim
67 words
The oligomer blend of claim 17 wherein the oligomer is made by the simultaneous condensation of diamines, diacid halides, and end cap monomers of the formula E--NH 2 or E--COX, wherein X=halogen, and wherein the polymer is synthesized by condensing the same diamines and the same diacid halides of the oligomer with a quenching end cap selected from the group consisting of aniline or benzoic acid chloride.
Claim 21
Dependent Claim
15 words
The oligomer of claim 1 wherein the oligomer and polymer have different average formula weights.
References Cited (Backward Citations)
US4695610A
Cited
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| 3.5 Years (Year 4) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
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