US3892708A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidisable powder based on a heat-stable bis-imide resin
Assignee: Rhone Poulenc SA
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Filing: 1974-06-17
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Granted: 1975-07-01
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Expires: 1994-06-17
Abstract
Abstract Fluidisable powder suitable for imparting crack-resistant coatings to articles subjected to high temperature are obtained from particles of dimensions between 5 and 200 Mu of a mixture of a prepolymer derived from N,N''-bis-imides of an unsaturated carboxylic acid and diprimary diamines and of glass micro-spheres and/or mica particles.
Inventors
- 👤 Michel Cronenberger
- 👤 Serge Laurent
- 👤 Maurice Mallet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:21
CPC Classifications
B; B05; B05D; B05D1/00; B05D1/18; B05D1/22; B05D1/24; C; C08; C08K; C08K3/00; C08K3/34; C08K7/00; C08K7/16; C08K7/18; C08K7/20; C08K7/22; C08K7/24; C08K7/28; B05D2505/00; B05D2505/50; B05D2601/00; B05D2601/20
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
47 words
A FLUIDISABLE POWDER IN THE FORM OF PARTICLES OF DIMENSIONS BETWEEN 5 AND 20U CONSISTING OF A MIXTURE COMPRISING: A. 5 TO 95 PERCENT BY WEIGHT OF A PREPOLYMER OBTAINED BY HEATING AT BETWEEN 50* AND 250*C., AN N,N''-BIS-IMIDE OF AN UNSATURATED DISCARBOXYLIC ACID OF GENERAL FORMULA
Claim 2
Dependent Claim
47 words
A FLUIDISABLE POWDER IN THE FORM OF PARTICLES OF DIMENSIONS BETWEEN 5 AND 20U CONSISTING OF A MIXTURE COMPRISING: A. 5 TO 95 PERCENT BY WEIGHT OF A PREPOLYMER OBTAINED BY HEATING AT BETWEEN 50* AND 250*C., AN N,N''-BIS-IMIDE OF AN UNSATURATED DISCARBOXYLIC ACID OF GENERAL FORMULA
Claim 3
Dependent Claim
54 words
A powder according to claim 1, which contains up to 50 percent by weight, based on the weight of the prepolymer and of the glass spheres and/or the mica of a filler which is a flow inhibitor, spreading agent, pigment, fireproofing agent or a filler which improves the adhesion of the powder to metals.
Claim 4
Dependent Claim
19 words
A powder according to claim 1, which comprises glass spheres of average size between 5 and 100 Mu .
Claim 5
Dependent Claim
19 words
A powder according to claim 1, which comprises mica particles of average size between 1 and 20 Mu .
Claim 6
Dependent Claim
17 words
A powder according to claim 1, comprising from 30 to 70 percent by weight of the propolymer.
Claim 7
Dependent Claim
31 words
A powder according to claim 1, wherein D is derived from maleic, citraconic, itaconic, pyrocinchonic or dichloromaleic anhydride or a Diels-Alder reaction product thereof with an acyclic, alicyclic, or heterocyclic diene.
Claim 8
Dependent Claim
43 words
A powder according to claim 1, wherein each of A and B, which may be the same or different, represents a linear or branched alkylene radical of less than 13 carbon atoms, a phenylene or cyclohexylene radical or a radical of the formula:
Claim 9
Dependent Claim
56 words
A powder according to claim 1, wherein each of A and B, which may be the same or different, represents a radical comprising more than one phenylene or cyclohexylene radical joined together by a single bond, -O-, -S-, an alkylene group of 1 to 3 carbon atoms, -CO-, -SO2-, -NR1-, -N N-, -CONH-, -COO-, -P(O)R1-, -CONH-x-NHCO-,
Claim 10
Dependent Claim
25 words
A powder according to claim 1, wherein the prepolymer is the reaction product of N,N''-4,4''-diphenylmethane-bis-maleimide and 4,4''-diamino-diphenylmethane in a molar ratio from 1.2:1 to 5:1.
Claim 11
Dependent Claim
35 words
A powder according to claim 2, wherein the filler is present in an amount from 3 to 20 percent by weight based on the weight of the mixture of prepolymer and glass spheres and/or mica.
Claim 12
Dependent Claim
34 words
A process for preparing a powder as claimed in claim 1, which comprises mixing the prepolymer, glass spheres and/or mica particles aNd, optionally, filler, before or after grinding the ingredients to the specified size.
Claim 13
Dependent Claim
40 words
A process for preparing a powder as claimed in claim 1, which comprises pre-polymerizing the bis-imide and diamine in the presence of the glass spheres and/or mica particles, and optionally, filler and grinding the resulting mixture to the specified size.
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) | 1978-06-30 | 1978-12-30 | 1979-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-30 | 1982-12-30 | 1983-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-30 | 1986-12-30 | 1987-07-01 | $7700.00 | Window Closed / Lapsed |