Claims
- 1. A process for preparing a copolymer having the formula --A--D--A--D--A--D-- wherein A is a maleic anhydride unit and D is a dioxolane unit, said process comprising reacting (A) a maleic anhydride reactant having the formula: ##STR10## wherein each R is independently selected from the class consisting of hydrogen, halogen, the cyano group, and primary and secondary alkyl groups having up to about 4 carbon atoms, and (D) a dioxolane having the formula ##STR11## wherein each R.sup.1 taken independently is an alkyl or aryl group having up to about 10 carbon atoms, or taken together are a divalent alkylene or arylene group having up to about 20 carbon atoms; each group indicated by R.sup.2 is hydrogen or an alkyl group having one to about four carbon atoms such that the total of the number of carbon atoms in said R.sup.2 groups, and the carbon atoms to which they are attached is up to about 8, said process being conducted in the presence of a free radical initiator.
- 2. The process of claim 1 conducted at a temperature in the range of from about -10.degree. to about 180.degree. C.
- 3. The process of claim 1 being conducted in the presence of an inert organic solvent.
- 4. The process of claim 3 wherein said solvent is selected from ethers and ketones.
- 5. The process of claim 4 wherein said solvent is a ketone.
- 6. The process of claim 5 wherein the carbonyl group in said ketone solvent is bonded to the R.sup.1 groups present in said dioxolane.
- 7. The process of claim 1 wherein said maleic anhydride reactant is maleic anhydride and said dioxolane is 2-ethyl-2-methyl-4-vinyl-1,3-dioxolane.
- 8. The process of claim 1 wherein said maleic anhydride is reacted with 2,2-dimethyl-4-vinyl-1,3-dioxolane.
- 9. The process of claim 1 being conducted in the absence of added solvent.
CROSS REFERENCE TO RELATED APPLICATION
This application is a division of application Ser. No. 498,178, filed Mar. 23, 1990 now U.S. Pat. No. 5,019,635.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2582708 |
Lippincott et al. |
Jan 1952 |
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Foreign Referenced Citations (1)
Number |
Date |
Country |
1223015 |
Feb 1971 |
GBX |
Divisions (1)
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Number |
Date |
Country |
Parent |
498178 |
Mar 1990 |
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