Claims
- 1. A process for preparing phenolic-resin-modified cyclopentadiene resins comprising reacting
- a) from 20 to 80% by weight of cyclopentadiene compounds,
- b) from 1 to 40% by weight of natural resin acids,
- c) from 1 to 60% by weight of phenols and
- d) from 1 to 20% by weight of aldehydes in the presence of
- e) from 0.01 to 1% by weight of alkali metal compounds.
- 2. The process as claimed in claim 1, wherein the components c) and d) are reacted in the reaction product formed from a) and b), which can be present as a melt or in solution, in the presence of alkali metal compounds.
- 3. The process as claimed in claim 1, wherein the compounds c) and d) are reacted in a temperature range from 70.degree. to 160.degree. C. and a pressure from 1 to 5 bar.
- 4. The process as claimed in claim 1, wherein the alkali metal compounds are selected from the group consisting of oxides, hydroxides, carbonates, bicarbonates, formates, acetates or oxalates of lithium, sodium or potassium.
- 5. The process as claimed in claim 4, wherein the alkali metal compounds used are lithium compounds.
- 6. The process as claimed in claim 5, wherein the lithium compound used is lithium hydroxide.
Priority Claims (1)
Number |
Date |
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Kind |
43 11 127.0 |
Apr 1993 |
DEX |
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PRIOR APPLICATION
This application is a division of U.S. patent application Ser. No. 222,673 filed Apr. 4, 1994, now U.S. Pat. No. 5,376,719.
US Referenced Citations (9)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0214526 |
Mar 1987 |
EPX |
2488613 |
Feb 1982 |
FRX |
2150216 |
Apr 1973 |
DEX |
Non-Patent Literature Citations (1)
Entry |
Copy of Search Report (3 pages) pp. 1-95. |
Divisions (1)
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Number |
Date |
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Parent |
222673 |
Apr 1994 |
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