Patent EP0274203A2 successfully refreshed from Google Patents.
EP0274203A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Oligomers with pendant maleimide groups
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1987-11-19
•
Granted: —
•
Expires: 2007-11-19
Abstract
Abstract An oligomer comprising chains having more than one repeat unit wherein Ar¹ is an aromatic group and R¹ is hydrogen or hydrocarbyl, a process for the preparation thereof and the use thereof as the matrix in fibre-reinforced composites are described.
Inventors
- 👤 John Gerard Carey
- 👤 Michael Edward Benet Jones
- 👤 Philip Wade
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-23 12:12
CPC Classifications
C; C08; C08G; C08G16/00; C08G16/02
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
36 words
An oligomer comprising chains which comprise on average more than one repeat unit of the general formula wherein Ar¹ is an aromatic group or a substituted aromatic group; and R¹ is hydrogen or a hydrocarbyl group.
Claim 2
Dependent Claim
36 words
An oligomer comprising chains which comprise on average more than one repeat unit of the general formula wherein Ar¹ is an aromatic group or a substituted aromatic group; and R¹ is hydrogen or a hydrocarbyl group.
Claim 3
Dependent Claim
23 words
An oligomer as claimed in claim 1 wherein the chains comprise at least two of the repeat units defined by general formula II.
Claim 4
Dependent Claim
64 words
An oligomer as claimed in claim 1 characterised in that there are further repeat units of general formula -Ar²-CHR²- III in the oligomer chain, wherein: Ar², which may be the same as or different from Ar¹, is an aromatic group or or a substituted aromatic group; and R², which may be the same as or different from R¹, is hydrogen or a hydrocarbyl group.
Claim 5
Dependent Claim
58 words
An oligomer as claimed in claim 1 wherein or in claim 3 wherein Ar² has the general formula -Ø-Y²-Ø-; in the said structures: Ø is the phenylene group; and Y² is (i) a direct link between the two phenylene groups, (ii) a divalent residue which includes one or more in-chain atoms, or (iii) a residue of general formula
Claim 6
Dependent Claim
35 words
wherein Y³, each of which may be the same or different is a group which activates the phenylene group to electrophilic attack; and Y⁴ is a group which deactivates the phenylene group to electrophilic attack.
Claim 7
Dependent Claim
35 words
wherein Y³, each of which may be the same or different is a group which activates the phenylene group to electrophilic attack; and Y⁴ is a group which deactivates the phenylene group to electrophilic attack.
Claim 8
Dependent Claim
11 words
An oligomer as claimed in claim 4 wherein Y² is oxygen
Claim 9
Dependent Claim
13 words
An oligomer as claimed in claim 5 having repeat units of the formula
Claim 10
Dependent Claim
17 words
An addition polymerisable composition comprising an oligomer as claimed in claim 1 and a monomer copolymerisable therewith.
Claim 11
Dependent Claim
28 words
An addition polymerisable composition as claimed in claim 7 characterised in that the monomer is a vinyl ester, an aromatic vinyl compound a vinyl nitride or an N-aryl-maleimide.
Claim 12
Dependent Claim
17 words
A cross-linked thermoset resin prepared by addition polymerisation of a polymerisable composition as claimed in claim 7.
Claim 13
Dependent Claim
17 words
A fibre reinforced composite characterised in that the matrix is a resin as claimed in claim 9.
Claim 14
Dependent Claim
53 words
A process for the preparation of an oligomer containing in-chain aromatic residues which process comprises the step of reacting one or more aromatic compounds with an aldehyde or ketone in the presence of a suitable acid which is dissolvable homogeneously in the reaction mixture, is strong and has an anion of low nucleophilicity.
Claim 15
Dependent Claim
53 words
A process for the preparation of an oligomer containing in-chain aromatic residues which process comprises the step of reacting one or more aromatic compounds with an aldehyde or ketone in the presence of a suitable acid which is dissolvable homogeneously in the reaction mixture, is strong and has an anion of low nucleophilicity.
Claim 16
Dependent Claim
19 words
A process as claimed in claim 11 wherein the aromatic compound bears an alkyl, alkoxy, halo or phenoxy substituent.
Claim 17
Dependent Claim
29 words
A process as claimed in claim 11 characterised in that it comprises the further step of introducing functional groups into the product of the step defined in claim 11.
Claim 18
Dependent Claim
29 words
A process as claimed in claim 11 wherein the one or more aromatic compounds has the general formula wherein Ar¹ has the meaning ascribed to it in claim 1.
Claim 19
Dependent Claim
25 words
A process as claimed in claim 14 wherein the molar ratio of suitable acid to the at least one aromatic compound is at least 1:40.
Claim 20
Dependent Claim
15 words
A process as claimed in claim 15 carried out under mild conditions as hereinbefore defined.
Claim 21
Dependent Claim
20 words
A process as claimed in claim 14 wherein the residue -Ar¹H₂ bears a substituent which activates it to electrophilic attack.
Claim 22
Dependent Claim
14 words
A process as claimed in claim 11 wherein the aldehyde or ketone comprises formaldehyde.
Claim 23
Dependent Claim
14 words
A process as claimed in claim 11 wherein the suitable acid is triflic acid.
Claim 24
Dependent Claim
32 words
A process as claimed in claim 11 wherein the molar ration of the at least one aromatic compound: to the one or more aldehydes or ketones: suitable acid is 1: about 2.0:0.05.
Claim 25
Dependent Claim
35 words
A process for the preparation of a composite as claimed in claim 10 comprising the steps of impregnating the fibres with an addition polymerisble composition as claimed in claim 7 and curing under suitable conditions.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.