Claims
- 1. A process for preparing weak acid type cation exchange resins by subjecting to caustic hydrolysis a copolymer comprising in polymerized form (1) a major amount ranging from about 70 to about 90 weight percent of an alkyl acrylate monomer which is hydrolyzable under caustic conditions, (2) a minor amount ranging from about 1 to about 20 weight percent of an alkyl acrylate monomer which has a less hydrolyzable character than the hydrolyzable monomer, and (3) an effective amount of a crosslinking monomer thereby producing cation exchange resin which exhibits improved resistance to osmotic shock.
- 2. A process of claim 1 wherein said weak acid type cation exchange resin has a porous character.
- 3. A process of claim 1 wherein the acrylate monomer, which is hydrolyzable, is an alkyl ester of acrylic acid which contains an alkyl functionality which contains less carbon atoms than the acrylate monomer having a less hydrolyzable character.
- 4. A process of claim 1 wherein said acrylate monomer, which is hydrolyzable, is an alkyl acrylate, wherein the alkyl can range from C.sub.1 to about C.sub.3.
- 5. A product prepared by the process of claim 1.
- 6. A process of claim 2 wherein the acrylate monomer, which is hydrolyzable, is an alkyl ester of acrylic acid which contains an alkyl functionality which contains less carbon atoms than the acrylate monomer having a less hydrolyzable character.
- 7. A process of claim 2 wherein said acrylate monomer, which is hydrolyzable, is an alkyl acrylate, wherein the alkyl can range from C.sub.1 to about C.sub.3.
- 8. A product prepared by the process of claim 2.
- 9. A process of claim 2 wherein said weak acid type cation exchange resin has a macroporous character.
- 10. A process of claim 9 wherein the acrylate monomer, which is hydrolyzable, is an alkyl ester of acrylic acid which contains an alkyl functionality which contains less carbon atoms than the acrylate monomer having a less hydrolyzable character.
- 11. A process of claim 9 wherein said acrylate monomer, which is hydrolyzable, is an alkyl acrylate, wherein the alkyl can range from C.sub.1 to about C.sub.3.
- 12. A product prepared by the process of claim 9.
- 13. A process of claim 1 wherein said monomer which is the major amount of monomer is methyl acrylate and said monomer which is the minor amount of monomer is butyl acrylate.
- 14. A process of claim 1 wherein said monomer which is the major amount of monomer is methyl acrylate and said monomer which is the minor amount of monomer is ethyl acrylate.
- 15. A process of claim 1 wherein said monomer which is the major amount of monomer is ethyl acrylate and said monomer which is the minor amount of monomer is butyl acrylate.
- 16. A process of claim 1 wherein said crosslinking monomer is a polyvinyl crosslinking monomer.
- 17. A process of claim 2 wherein said crosslinking monomer is a polyvinyl crosslinking monomer.
- 18. A process of claim 9 wherein said crosslinking monomer is a polyvinyl crosslinking monomer.
REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of U.S. patent application Ser. No. 596,885, filed Apr. 5, 1984, and now abandoned.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4062817 |
Westerman |
Dec 1977 |
|
4524186 |
Nagase |
Jun 1985 |
|
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
596885 |
Apr 1984 |
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