Claims
- 1. A process for the preparation of imidized acrylic polymers, comprising reacting an acrylic resin and a modifying agent having the formula:
- R-X-NH-R' (I)
- wherein:
- R and R' are either equal to or different from each other, and represent hydrogen or an alkyl, cycloalkyl, aryl or alkylaryl radical containing from 1 to 20 carbon atoms, and
- X is a bifunctional radical selected from the group consisting of: --CO--, --CONH--, --NHCO--, --OCO--, --SO.sub.2 --, --C.sub.6 H.sub.4 SO.sub.2 --
- where R and R' differ, the former can contain halogen atoms under ambient pressure, or, lower, and at a temperature higher than the melting temperature of the acrylic resin.
- 2. The process according to claim 1, wherein the reaction is carried out under a pressure comprised within the range of from about 760 to 10.sup.-2 torr; and at a temperature comprised within the range of from 200.degree. to 350.degree. C.
- 3. The process according to claim 1, wherein the modifying agent is used in amounts comprised within the range of from 5 to 60%, relative to the acrylic monomer unit.
- 4. The process according to claim 2, wherein the modifying agent is used in amounts comprised within the range of from 5 to 60%, relative to the acrylic monomer unit.
- 5. A process according to claim 1, wherein the reaction between the acrylic resin and the modifying agent of the formula (I) as recited in claim 6 is carried out in the presence of basic catalysts, acidic catalysts, and/or transesterification catalysts.
- 6. Process according to claim 5, wherein the catalysts comprise tertiary amines, selected from the group consisting of as dicyclohexyl-amine, 1,1,3,3-tetramethylguanidine, 1,3-diphenyl-guanidine, quinoline, isoquinoline, 4-benzylpyridine, 4-phenyl-pyridine, 2,3-benzodiazine, 1,4-benzodiazine, 1-benzazine, 1,3-benzodiazine, N,N'-dicyclohexylcarbodiimide, 2,2'-bipyridyl, 2,3'-bipyridyl, 2,4'-bipyridyl or catalysts selected from the group consisting of HCl, Sb.sub.2 O.sub.3, Ti(OC.sub.4 H.sub.9).sub.4, NaNH.sub.2, SnO.sub.2, potassium or sodium alkoxides, manganese acetate.
- 7. The process according to claim 1, wherein the acrylic resin is used both in the molten state, and dissolved in a solvent.
- 8. The process according to claim 1, wherein the reaction between the acrylic resin and the modifying agent having the general formula (I) of claim 1 is carried out in an extruder, in a mixer, or in similar devices, provided with means for degassing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
19065 A/87 |
Jan 1987 |
ITX |
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Parent Case Info
This is a division of application Ser. No. 143,321, filed Jan. 13, 1988, now U.S. Pat. No. 4,968,755.
US Referenced Citations (7)
Divisions (1)
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Number |
Date |
Country |
Parent |
143321 |
Jan 1988 |
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