EP0112650A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Aromatic oligomers and resins
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1983-11-22
•
Granted: —
•
Expires: 2003-11-22
Abstract
Abstract Compositions comprising an oligomer which (a) comprises the repeating unit (Ar-CHR), and where Ar is an aromatic group and R is hydrogen or a hydrocarbyl group or hydrogen, (b) has pendant and/or terminal groups which include inter alia acyloxymethyl, hydroxymethyl and carboxyl, and (c) has a functionality between 0.5 and 10, and processes for the preparation thereof are described. These compositions may be used in dental, electrical and electronic applications.
Inventors
- 👤 Michael Edward Benet Jones
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 22:43
CPC Classifications
C; C08; C08G; C08G16/00; C08G16/02; C08G16/0212; C08G16/0218; A; A61; A61K; A61K6/00; A61K6/20; A61K6/30; A61K6/80; A61K6/884; A61K6/887; A61K6/891; C08G16/025; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A composition comprising an oligomer, which may be linear or branched, which comprises the repeating unit and which has pendant and/or terminal groups, which groups, which may be the same or different, are acyloxymethyl, hydroxymethyl, carboxyl, wherein Ar l is an aromatic group, or a substituted derivative thereof, each of which may be the same or different; R, each of which may be the same or different, is hydrogen, or a hydrocarbyl group; and the functionality of the oligomer is between 0.5 and 10 with the proviso that where the aromatic group is a diphenyl oxide, diphenyl sulphide, dibenzofuran or dibenzothiophene residue, R is hydrogen and the pendant and/or terminal groups are acyloxymethyl and/or hydroxymethyl then the ratio of para-para linkages to ortho-para linkages as hereinbefore defined is less than 5:1.
Claim 2
Dependent Claim
131 words
A composition comprising an oligomer, which may be linear or branched, which comprises the repeating unit and which has pendant and/or terminal groups, which groups, which may be the same or different, are acyloxymethyl, hydroxymethyl, carboxyl, wherein Ar l is an aromatic group, or a substituted derivative thereof, each of which may be the same or different; R, each of which may be the same or different, is hydrogen, or a hydrocarbyl group; and the functionality of the oligomer is between 0.5 and 10 with the proviso that where the aromatic group is a diphenyl oxide, diphenyl sulphide, dibenzofuran or dibenzothiophene residue, R is hydrogen and the pendant and/or terminal groups are acyloxymethyl and/or hydroxymethyl then the ratio of para-para linkages to ortho-para linkages as hereinbefore defined is less than 5:1.
Claim 3
Dependent Claim
16 words
A composition as claimed in Claim 1 wherein the said ratio is between 5:1 and 2:1.
Claim 4
Dependent Claim
30 words
A composition as claimed in Claim 1 wherein A r l has the structure -0- Y 1- 0- wherein 0 and Y 1 have the meanings hereinbefore ascribed to them.
Claim 5
Dependent Claim
11 words
A composition as claimed in Claim 3 wherein y1 is oxygen.
Claim 6
Dependent Claim
11 words
A composition as claimed in Claim 1 wherein R is hydrogen.
Claim 7
Dependent Claim
16 words
A composition as claimed in Claim 1 wherein the pendant and/or terminal groups comprise acyloxymethyl groups.
Claim 8
Dependent Claim
23 words
A composition as claimed in Claim 6 wherein the acyl group in the acyloxymethyl group is derived from an olefinically unsaturated carboxylic acid.
Claim 9
Dependent Claim
19 words
A composition as claimed in Claim 7 wherein the olefinically unsaturated carboxylic acid is acrylic acid or methacrylic acid.
Claim 10
Dependent Claim
16 words
A composition as claimed in Claim 1 in which the functionality is between 2 and 6.
Claim 11
Dependent Claim
78 words
A process for the preparation of oligomers as defined in Claim 1 which process comprises at least the step of reacting an aromatic compound, an aldehyde and a carboxylic acid in the presence of a strong acid characterised in that the molar ratio of strong acid to aromatic compound is at least 1:1, with the proviso that where the carboxylic acid is a polymerisable olefinically unsaturated carboxylic acid the reaction is carried out at a temperature below 90°C.
Claim 12
Dependent Claim
26 words
A process as claimed in Claim 10 wherein the molar ratios of aromatic compound: aldehyde: carboxylic acid: strong acid: water are 1: 2-10: 5-15: 1-10: 2-30.
Claim 13
Dependent Claim
16 words
A process as claimed in Claim 10 wherein the reaction temperature is between 60°C and 80°C.
Claim 14
Dependent Claim
40 words
Use of an oligomer which is derived from an aromatic compound and an aldehyde and which has pendant and/or terminal acyloxymethyl groups in which the acyl group is derived from a polymerisable olefinically unsaturated carboxylic acid as a dental material.
Claim 15
Dependent Claim
40 words
Use of an oligomer which is derived from an aromatic compound and an aldehyde and which has pendant and/or terminal acyloxymethyl groups in which the acyl group is derived from a polymerisable olefinically unsaturated carboxylic acid as a dental material.
Claim 16
Dependent Claim
14 words
Use of an oligomer as defined in Claim 1 in electronic and electrical applications.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.