US5412062A
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Thermally depolymerisable polyoxalate or polymalonate polymers containing hydrocarbon groups with 6-30 carbon atoms and a tertiary carbon atoms attached to bridging oxygen atom
Assignee: Vesuvius Holdings Ltd
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Filing: 1992-08-28
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Granted: 1995-05-02
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Expires: 2012-08-28
Abstract
Abstract Thermally depolymerizable polyoxalate and polymalonate polymers which contain hydrocarbon groups having from 6 to 30 carbon atoms and a tertiary carbon atom attached to at least one of the bridging oxygen atoms in the structure are usable as binders for powdered glass ceramic or metallic materials, and as rheological control agents in paste formulations.
Inventors
- 👤 Gerald A. Power
- 👤 Alison M. Wagland
- 👤 Andrew C. Mackie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:31
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/36; B23K35/3612; B23K35/3613; C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63448; C04B35/6346; C08; C08G; C08G63/00; C08G63/02; C08G63/12; C08G63/16; C08G63/52; C08G63/64; C08J; C08J9/00; C08J9/04; C08J9/06; C09; C09D; C09D167/00; C09D167/02; H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
99 words
A polymer or copolymer which contains repeating groups of the formula ##STR5## where R 1 and R 2 are each independently a hydrocarbon group containing from 6 to 30 carbon atoms which has a tertiary carbon atom attached to at least one of the bridging oxygen atoms, R 3 , R 3' and R 4 , R 4' are each independently a hydrogen atom, an alkyl group containing from 1 to 12 carbon atoms, an aryl group, a heterocyclic group or an acyl group containing from 1 to 12 carbon atoms, and n and n' are 0 or 1.
Claim 2
Dependent Claim
99 words
A polymer or copolymer which contains repeating groups of the formula ##STR5## where R 1 and R 2 are each independently a hydrocarbon group containing from 6 to 30 carbon atoms which has a tertiary carbon atom attached to at least one of the bridging oxygen atoms, R 3 , R 3' and R 4 , R 4' are each independently a hydrogen atom, an alkyl group containing from 1 to 12 carbon atoms, an aryl group, a heterocyclic group or an acyl group containing from 1 to 12 carbon atoms, and n and n' are 0 or 1.
Claim 3
Dependent Claim
64 words
A polymer or copolymer as claimed in claim 1 wherein n and n' are 1 and R 3 , R 3' and R 4 , R 4' are both hydrogen atoms, or one of R 3 and R 4 , R 3' and R 4' , is a hydrogen atom and the other is an acyl group containing from 1 to 12 carbon atoms.
Claim 4
Dependent Claim
16 words
A copolymer as claimed in claim 1 wherein n and n' are randomly 0 or 1.
Claim 5
Dependent Claim
87 words
A copolymer characterized in that it comprises groups of the formula ##STR6## where R 1 , R 2 , R 3 , R 3' , R 4 , R 4' n and n' are each as defined in claim 1 and groups of the formula ##STR7## where R 5 and R 6 each independently represents a hydrocarbon group containing from 4 to 30 carbon atoms, the said group having a tertiary carbon atom, an allylic, propargylic or benzylic group attached directly to at least one oxygen atom.
Claim 6
Dependent Claim
52 words
A method for the preparation of a polymer or copolymer as claimed in claim 1 which method comprises the condensation of a diol of the general formula HO--R.sup.1 --OH and/or HO--R.sup.2 --OH with an oxalyl and/or malonyl moiety characterized in that R 1 and R 2 are as defined in claim 1.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 5 where the oxalyl and/or malonyl moiety is in the form of an acid, acid chloride or ester.
Claim 8
Dependent Claim
18 words
A method as claimed in claim 5 wherein the diol is 2,5-dimethylhexane-2,5-diol, 3,6-dimethyl-4-octyne-3,6-diol or 2,3-dimethylbutanediol or mixtures thereof.
Claim 9
Dependent Claim
44 words
A composition which comprises at least one powdered or otherwise comminuted material admixed with at least one polymer or copolymer, or a solution thereof in a suitable solvent, characterized in that the polymer or copolymer is a thermally depolymerisable polymer as claimed claim 1.
Claim 10
Dependent Claim
34 words
A composition as claimed in claim 8 wherein the powdered material is a powdered glass, powdered ceramic material, powdered plastic or other similar organic material, or powdered metal or alloy, or a mixture thereof.
Claim 11
Dependent Claim
50 words
A composition as claimed in claim 9 wherein the powdered material is powdered glass or ceramic, or powdered, flaked or otherwise comminuted metal or alloy, or a mixture thereof, which is present in an amount of from 50 to 99.999% by weight based on the total weight of the composition.
Claim 12
Dependent Claim
37 words
A composition as claimed in claim 9 wherein the powdered material is a powdered ceramic material which is present in an amount of from 95 to 99.5% by weight based on the total weight of the composition.
Claim 13
Dependent Claim
16 words
A composition as claimed in claim 8 wherein a mixture of thermally depolymerisable polymers is used.
Claim 14
Dependent Claim
26 words
A composition as claimed in claim 8 wherein the thermally depolymerisable polymer, or a mixture thereof, is dissolved in a solvent or a mixture of solvents.
Claim 15
Dependent Claim
22 words
A composition as claimed in claim 13 wherein the solvent for electronic paste applications is a glycol ether or a derivative thereof.
Claim 16
Dependent Claim
30 words
A solder paste, glass paste or hybrid thick film paste which comprises as a rheological control agent and/or binder a thermally depolymerisable polymer or copolymer as claimed in claim 1.
Claim 17
Dependent Claim
22 words
A protective coating for a metal or other material which comprises a thermally depolymerisable polymer or copolymer as claimed in claim 1.
Claim 18
Dependent Claim
23 words
A blowing agent for a polyurethane or similar polymeric foam which comprises a thermally depolymerisable polymer or copolymer as claimed in claim 1.
Claim 19
Dependent Claim
17 words
A thermally sensitive device which comprises a thermally depolymerisable polymer or copolymer as claimed in claim 1.
References Cited (Backward Citations)
US3169121A
Cited
US3043808A
Cited
US4343912A
Cited
US4446271A
Cited
US5114983A
Cited
US5126380A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-05-01 | 1998-10-31 | 1999-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-05-01 | 2002-10-31 | 2003-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-05-01 | 2006-10-31 | 2007-05-02 | $7700.00 | Window Closed / Lapsed |