Patent US4362860A successfully refreshed from Google Patents.
US4362860A
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Addition curing polystyryl pyridine
Assignee: Boeing North American Inc
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Filing: 1981-11-02
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Granted: 1982-12-07
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Expires: 2001-11-02
Abstract
Abstract A fire-resistant polystyryl pyridine polymer is provided by two separate reactions: (1) the condensation of a methylated pyridine, an aromatic dialdehyde, and a methyl vinyl pyridine; and (2) by the addition curing of the condensation product. The condensation product provides a prepolymer suitable for forming a composite with another material such as graphite fibers, and the addition reaction provides a means to cure the prepolymer without eliminating volatile products.
Inventors
- 👤 Joseph J. Ratto
- 👤 Charles L. Hamermesh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:32
CPC Classifications
C; C08; C08L; C08L61/00; C08G; C08G16/00; C08G16/02; C08G16/025; C08G16/0268
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
19 words
A prepolymer which comprises the condensation products of a methylated pyridine, an aromatic dialdehyde, and a methyl vinyl pyridine.
Claim 2
Dependent Claim
19 words
A prepolymer which comprises the condensation products of a methylated pyridine, an aromatic dialdehyde, and a methyl vinyl pyridine.
Claim 3
Dependent Claim
22 words
The prepolymer as claimed in claim 1, wherein said methylated pyridine comprises a dimethyl pyridine and said methyl vinyl pyridine comprises 2-methyl-5-vinylpyridine.
Claim 4
Dependent Claim
17 words
The prepolymer as claimed in claim 1 having a formula which contains units of the type: ##STR3##
Claim 5
Dependent Claim
19 words
A polymer obtained by heating at a temperature of about 175° C.-270° C. of prepolymer according to claim 1.
Claim 6
Dependent Claim
15 words
A thermosetting prepolymer which comprises the condensation products of a dimethyl pyridine, terephthaldicarboxaldehyde, and 2-methyl-5-vinylpyridine.
Claim 7
Dependent Claim
15 words
A thermosetting prepolymer which comprises the condensation products of a dimethyl pyridine, terephthaldicarboxaldehyde, and 2-methyl-5-vinylpyridine.
Claim 8
Independent Claim
41 words
A method of preparing a prepolymer which comprises reacting a methylated pyridine, an aromatic dialdehyde, and a methyl vinyl pyridine at a temperature ranging from about 80° C. to 150° C. in the presence of an active anhydride and an acid.
Claim 9
Independent Claim
41 words
A method of preparing a prepolymer which comprises reacting a methylated pyridine, an aromatic dialdehyde, and a methyl vinyl pyridine at a temperature ranging from about 80° C. to 150° C. in the presence of an active anhydride and an acid.
Claim 10
Dependent Claim
33 words
The method as claimed in claim 6, wherein said methylated pyridine comprises a dimethyl pyridine, said methyl vinyl pyridine comprises 2-methyl-5-vinylpyridine, said active anhydride comprises acetic anhydride, and said acid comprises acetic acid.
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) | 1985-12-06 | 1986-06-07 | 1986-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-12-06 | 1990-06-07 | 1990-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-12-06 | 1994-06-07 | 1994-12-07 | $7700.00 | Window Closed / Lapsed |