Claims
- 1. A thermally stable bisimido prepolymer soluble in a polar organic solvent prepared by reacting
- (a) an N,N'-bismaleimide of the formula ##STR8## in which: each of the symbols Y, which may be identical or different, is a hydrogen atom, a methyl radical or a chlorine atom;
- the symbol A is a cyclohexylene, phenylene, 4-methyl-1,3-phenylene, 2-methyl-1,3-phenylene, 5-methyl-1,3-phenylene or 2,5-diethyl-3-methyl-1,4-phenylene radical, or a radical of the formula: ##STR9## in which T is a single valence bond or one of the groups: ##STR10## and each of the symbols X, which may be identical or different, is a hydrogen atom or a methyl, ethyl, propyl or isopropyl radical; with
- (b) an acrylate reactant which comprises either:
- (b1) a novolak epoxy (meth)acrylate corresponding to the general formula: ##STR11## in which: each of the symbols R.sub.1 and R.sub.2, which may be identical or different, is a hydrogen atom or a methyl radical; and
- n is a positive number ranging from 0.1 to 8;
- or a mixture of the aforesaid compound (b1) with not more than 30% by weight, relative to the weight of the mixture (b1)+(b2), of a compound (b2) of the general formula: ##STR12## in which: the symbol R.sub.3 is a hydrogen atom or a methyl radical;
- the symbol B is a trivalent linear or branched chain saturated aliphatic hydrocarbon radical containing from 1 to 20 carbon atoms, with the proviso that such radical may contain one or more oxygen bridges and one or more hydroxyl groups; in the presence of
- (c) an imidazole catalyst compound.
- 2. The bisimido polymer as defined by claim 1, said bismaleimide (a) of the formula (I) comprising N,N'-meta-phenylenebismaleimide; N,N'-para-phenylenebismaleimide; N,N'-4,4'-diphenylmethanebismaleimide; N,N'-4,4'-diphenyl ether bismaleimide; N,N'-4,4'-diphenylsulfonebismaleimide; N,N'-1,4-cyclohexylenebismaleimide; N,N'-4,4'-diphenyl-1,1-cyclohexanebismaleimide; N,N'-4,4'-(2,2-diphenylpropane)bismaleimide; N,N'-4,4'-triphenylmethanebismaleimide; N,N'-2-methyl-1,3-phenylenebismaleimide; N,N'-4-methyl-1,3-phenylenebismaleimide; or N,N'-5-methyl-1,3-phenylenebismaleimide.
- 3. The bisimido polymer as defined by claim 1, said acrylate reactant (b) comprising a novolak epoxy acrylate (b1) of formula (II), in which R.sub.1 and R.sub.2 are each a hydrogen atom and n is a positive number ranging from 0.1 to 5, or admixture of such acrylate with not more than 25% by weight, relative to the weight of the mixture (b1)+(b2), of trimethylolpropane triacrylate (b2).
- 4. The bisimido polymer as defined by claim 1, said imidazole compound (c) having the general formula: ##STR13## in which each of R.sub.4, R.sub.5, R.sub.6 and R.sub.7, which may be identical or different, is a hydrogen atom, an alkyl or alkoxy radical containing from 1 to 20 carbon atoms, or a vinyl, phenyl or nitro radical, with the proviso that R.sub.6 and R.sub.7 may together form, with the carbon atoms from which they depend, a single ring member.
- 5. The bisimido polymer as defined by claim 4, said imidazole compound (c) comprising imidazole, glyoxaline, 1-methylimidazole, 2-methylimidazole, 1,2-dimethylimidazole, 1-vinylimidazole, 1-vinyl-2-methylimidazole or benzimidazole.
- 6. The bisimido polymer as defined by claim 1, wherein the amounts of N,N'-bisimide (a) and acrylate reactant (b) are such that the ratio: ##EQU3## ranges from 1.7/1 to 10/1, and the amount of imidazole compound (c), expressed as the number of moles of compound (c) per 100 g of bisimide (a), ranges from 0.15.times.10.sup.-3 to 6.times.10.sup.-3.
- 7. The bisimido polymer as defined by claim 1, in cured state and insoluble in polar organic solvents, and which does not exhibit any significant softening below its degradation temperature.
- 8. The bisimido polymer as defined by claim 1, in heat-curable prepolymer state and soluble in polar organic solvents, and which has a softening point at a temperature below 200.degree. C.
- 9. A shaped article comprising the bisimido polymer as defined by claim 1.
- 10. A shaped article comprising the bisimido polymer as defined by claim 7.
- 11. A shaped article comprising the bisimido polymer as defined by claim 8.
- 12. A thermally stable bisimido polymer, the prepolymer of which is soluble in a polar organic solvent, prepared by reacting
- (a) an N,N'-bismaleimide of the formula ##STR14## in which each of the symbols Y, which may be identical or different, is a hydrogen atom, a methyl radical or a chlorine atom;
- the symbol A is a cyclohexylene, phenylene, 4-methyl-1,3-phenylene, 2-methyl-1,3-phenylene, 5-methyl-1,3-phenylene or 2,5-diethyl-3-methyl-1,4-phenylene radical, or a radical of the formula: ##STR15## in which T is a single valence bond or one of the groups: ##STR16## and each of the symbols X, which may be identical or different, is a hydrogen atom or a methyl, ethyl, propyl or isopropyl radical; with
- (b) an acrylate reactant which comprises either:
- (b1) a novolak epoxy (meth)acrylate corresponding to the general formula: ##STR17## in which: each of the symbols R.sub.1 and R.sub.2, which may be identical or different, is a hydrogen atom or a methyl radical; and
- n is a positive number ranging from 0.1 to 8;
- or a mixture of the aforesaid compound (b1) with not more than 30% by weight, relative to the weight of the mixture (b1)+(b2), of a compound (b2) of the general formula: ##STR18## in which: the symbol R.sub.3 is a hydrogen atom or a methyl radical;
- the symbol B is a trivalent linear or branched chain saturated aliphatic hydrocarbon radical containing from 1 to 20 carbon atoms, with the proviso that such radical may contain one or more oxygen bridges and one or more hydroxyl groups; in the presence of
- (c) an imidazole catalyst compound.
Priority Claims (2)
Number |
Date |
Country |
Kind |
87 09000 |
Jun 1987 |
FRX |
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87 17014 |
Dec 1987 |
FRX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/608,798, filed Nov. 5, 1990, now abandoned, which is a divisional of application Ser. No. 07/210,508, filed Jun. 23, 1988 now U.S. Pat. No. 4,994,536.
US Referenced Citations (10)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2544900 |
Jul 1976 |
DEX |
51-037669 |
Oct 1976 |
JPX |
55-127550 |
Feb 1980 |
JPX |
167304 |
Jan 1986 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
210508 |
Jun 1988 |
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Continuations (1)
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Number |
Date |
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Parent |
608798 |
Nov 1990 |
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