US4530992A
Expired / Lapsed
US
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Aromatic oligomers and resins
Assignee: Avecia Ltd
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Filing: 1983-12-06
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Granted: 1985-07-23
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Expires: 2003-12-06
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 E. B. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:30
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
134 words
A composition comprising an oligomer, which may be linear or branched, which comprises the repeating unit --(Ar.sup.1 --CHR)-- and which has pendant and/or terminal groups, which groups, which may be the same or different, are acyloxymethyl, hydroxymethyl, carboxyl, ##STR13## wherein Ar 1 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
134 words
A composition comprising an oligomer, which may be linear or branched, which comprises the repeating unit --(Ar.sup.1 --CHR)-- and which has pendant and/or terminal groups, which groups, which may be the same or different, are acyloxymethyl, hydroxymethyl, carboxyl, ##STR13## wherein Ar 1 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
65 words
A composition as claimed in claim 1 wherein Ar 1 has the structure --φ--Y 1 --φ-- wherein φ is the phenylene group and Y 1 is a direct link between the two phenylene groups, or a divalent residue which includes one or more in-chain atoms, each of which atoms may be carbon or a hetero atom and may have one or more atoms appendant thereto.
Claim 5
Dependent Claim
12 words
A composition as claimed in claim 3 wherein Y 1 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
79 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
18 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
18 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)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |