US3875087A
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Multicellular polymers
Assignee: Rhone Poulenc SA
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Filing: 1974-04-23
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Granted: 1975-04-01
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Expires: 1994-04-23
Abstract
Abstract Multicellular polymers having excellent chemical inertness and heat resistance are produced by heating at a temperature from 100* to 300*C, maleic anhydride and a polyaldimine of the general formula
Inventors
- 👤 Max Gruffaz
- 👤 Bernard Rollet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:50
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/02; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/12; C08J2379/00; C08J2379/04; C08J2379/08
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
25 words
PROCESS FOR PREPARING A MULTICELLULAR POLYMER WHICH COMPRISES HEATING, AT A TEMPERATURE FROM 100* TO 300*C. MALEIC ANHYDRIDE AND A POLYALDIMINE OF THE GENERAL FORMULA
Claim 2
Dependent Claim
25 words
PROCESS FOR PREPARING A MULTICELLULAR POLYMER WHICH COMPRISES HEATING, AT A TEMPERATURE FROM 100* TO 300*C. MALEIC ANHYDRIDE AND A POLYALDIMINE OF THE GENERAL FORMULA
Claim 3
Dependent Claim
22 words
Process according to claim 1, in which 0.5 to 5 mols of maleic anhydride per imine group in the polyaldimine are employed.
Claim 4
Dependent Claim
22 words
Process according to claim 2, in which 0.7 to 3 mols of maleic anhydride per imine group in the polyaldimine are employed.
Claim 5
Dependent Claim
12 words
Process according to claim 1, in which the polyadimine is a bis-aldimine.
Claim 6
Dependent Claim
23 words
Process according to claim 1, in which at least one of A and G, contains at least one phenyl, pyridyl or furane ring.
Claim 7
Dependent Claim
16 words
Process according to claim 5, in which G represents a phenyl, Alpha -hydroxyphenyl or 4-furfuryl radical.
Claim 8
Dependent Claim
16 words
Process according to claim 1, in which A represents a 2,6-pyridyl radical or a diphenylenemethane radical.
Claim 9
Dependent Claim
44 words
Process according to claim 1, which comprises a. preparing a prepolymer by heating the maleic anhydride and polyaldimine at a temperature from 100* to 220*C and b. heating this prepolymer at a temperature from 200* to 300*C until the desired cellular structure is produced.
Claim 10
Dependent Claim
18 words
Process according to claim 8, in which, step (a) is carried out for 5 minutes to 3 hours.
Claim 11
Dependent Claim
24 words
Process according to claim 8, in which at least one of a surface-active agent, pulverulent filler, pore-forming agent and a heat-stabilising agent is incorporated.
Claim 12
Dependent Claim
92 words
A multicellular polymer obtained by: a. preparing a prepolymer by heating maleic anhydride and a polyaldimine of the general formula: A (N CH - G)n in which G represents a phenyl, napthyl, pyridyl, pyrimidinyl, furyl, thienyl, benzo(b)thienyl, thienyl, indolyl, triazolyl or 3,4-methylenedioxy-phenyl radical or a several said radicals connected to one another directly or via a -O-, -S-, -NH-, -COO-, -CONH-, -SO2-, -N N-, -N N(O)-, -CO- or a linear or branched alkylene or alkenylene group with up to 8 carbon atoms, A represents a phenylene radical, a radical of the formula
Claim 13
Dependent Claim
92 words
A multicellular polymer obtained by: a. preparing a prepolymer by heating maleic anhydride and a polyaldimine of the general formula: A (N CH - G)n in which G represents a phenyl, napthyl, pyridyl, pyrimidinyl, furyl, thienyl, benzo(b)thienyl, thienyl, indolyl, triazolyl or 3,4-methylenedioxy-phenyl radical or a several said radicals connected to one another directly or via a -O-, -S-, -NH-, -COO-, -CONH-, -SO2-, -N N-, -N N(O)-, -CO- or a linear or branched alkylene or alkenylene group with up to 8 carbon atoms, A represents a phenylene radical, a radical of the formula
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |