EP0047069A1
Expired / Lapsed
EP
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Resin derived from acenaphthene and process for its production
Assignee: Coal Industry Patents Ltd
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Filing: 1981-08-04
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Granted: —
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Expires: 2001-08-04
Abstract
Abstract The resin comprises oligomers of naphthalic acid groups bridged by substantially only keto groups, the oligomers being joined together with a di- or tetra-functional primary aromatic amine and having been derived from a resin produced by acid-catalysed condensation of acenaphthene and a formaldehyde donor. …<??>It is envisaged that the resin will be of use in the preparation of drogue parachutes and in other circumstances where a thermally stable resin is required.
Inventors
- 👤 Joseph Gordon Robinson
- 👤 Sally Ann Brain
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 04:10
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1067; C07; C07C; C07C65/00; C07C65/32; C07C65/34; C08G10/00; C08G10/02; C08G10/04; C08G73/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
86 words
A process for the production of a thermally stable resin comprising reacting acenaphthene with a formaldehyde donor in the presence of an acid catalyst to produce a low molecular weight resin comprising oligomers of acenaphthene moieties joined by substantially only methylene bridges, characterised in that the low molecular weight resin is oxidised to-form an intermediate resin comprising naphthalic acid units joined by keto . bridges, and the intermediate resin is reacted with a di- or tetra- functional primary aromatic amine to produce the thermally stable resin.
Claim 2
Dependent Claim
86 words
A process for the production of a thermally stable resin comprising reacting acenaphthene with a formaldehyde donor in the presence of an acid catalyst to produce a low molecular weight resin comprising oligomers of acenaphthene moieties joined by substantially only methylene bridges, characterised in that the low molecular weight resin is oxidised to-form an intermediate resin comprising naphthalic acid units joined by keto . bridges, and the intermediate resin is reacted with a di- or tetra- functional primary aromatic amine to produce the thermally stable resin.
Claim 3
Dependent Claim
27 words
A process according to claim 1, characterised in that, the intermediate resin is dehydrated to its anhydride derivative prior to reacting it with a primary aromatic diamine.
Claim 4
Dependent Claim
19 words
A process according to claim 2, characterised in that, the dehydration is carried out using an organic acid anhydride.
Claim 5
Dependent Claim
36 words
A process according to any one of the preceding claims, characterised in that, in reacting the acenaphthene with the formaldehyde donor, the molar ratio of formaldehyde to acenaphthene is in the range from 4:1 to 0.3:1.
Claim 6
Dependent Claim
26 words
A process according to any one of the preceding claims, characterised in that, the reaction of acenaphthene with formaldehyde is carried out in glacial acetic acid.
Claim 7
Dependent Claim
27 words
A process according to any one of the preceding claims, characterised in that, the oxidation of the low molecular weight resin is carried out using acid dichromate.
Claim 8
Dependent Claim
50 words
A thermally stable resin, characterised in that, it comprises oligomers of naphthalic acid groups bridged by substantially only keto groups, the oligomers being joined together with a di- or tetra-functional primary aromatic amine and having been derived from a resin produced by acid-catalysed condensation of acenaphthene and a formaldehyde donor.
Claim 9
Dependent Claim
50 words
A thermally stable resin, characterised in that, it comprises oligomers of naphthalic acid groups bridged by substantially only keto groups, the oligomers being joined together with a di- or tetra-functional primary aromatic amine and having been derived from a resin produced by acid-catalysed condensation of acenaphthene and a formaldehyde donor.
Claim 10
Dependent Claim
32 words
8 . A thermally stable resin according to claim 7, characterised in that, the amine is 3, 4, 3', 4' tetraaminodiphenyl, 2, 3, 2', 3' tetraaminodiphenylmethane, 1, 4 diaminobenzene or di-(4-aminophenyl) methane.
Claim 11
Dependent Claim
28 words
9 . A thermally stable resin according to either one of claims 8 and 9, characterised in that, the oligomers are joined into linear polymers by the amine.
Claim 12
Dependent Claim
27 words
A thermally stable resin according to either one of claims 8 and 9 , characterised in that, the oligomers are joined into cross-linked polymers by the amine.
References Cited (Backward Citations)
SU652194A1
Cited
EP0027305A1
Cited
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