Latent catalyst systems for cationically polymerizable materials |
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| 申请号 | US37702673 | 申请日 | 1973-07-06 | 公开(公告)号 | US3907706A | 公开(公告)日 | 1975-09-23 |
| 申请人 | MINNESOTA MINING & MFG; | 发明人 | ROBINS JANIS; | ||||
| 摘要 | A multi-component catalyst system that is latent at a first elevated temperature but is rapidly activated at a second temperature only slightly elevated over the first temperature comprises 1) metal salts of fluoroalkane sulfonic acids or bis(fluoroalkylsulfonyl)methanes, and 2) a thermally decomposable ester reaction product of a tertiary alkyl alcohol and an acid that forms a chelation complex with the metal ion of the metal salt. In some embodiments the catalyst system further includes a buffering compound that retards activity of the catalyst system. | ||||||
| 权利要求 | 1. IN COMBINATION AS A CATALYST SYSTEM SOLUBLE IN THE MATERIAL TO BE CATALYZED, 1) ONE EQUIVALENT OF METAL SALT SELECTED FROM THE GROUP CONSISTING OF LITHIUM, SODIUM, CALCIUM, STRONTIUM, SILVER, BARIUM, AND LEAD SALTS OF A FLUOROALKYLSULFONYL ACID SELECTED FROM THE GROUP CONSISTING OF FLUOROALKANE SULFONIC ACIDS AND BIS(FLUOROALKYLSULFONYL)-METHANES: AND 2) ABOUT 0.2 TO ABOUT 2 EQUIVALENTS OF THERMALLY DECOMPOSABLE ESTER REACTION PRODUCT OF A TERTIARY ALKYL ALCOHOL AND AN ACID THAT FORMS A CHELATION COMPLEX WITH THE METAL CATION OF SAID METAL SALT, ESTER REACTION PRODUCT DECOMPOSING UPON HEATNG TO RELEASE THE CHELATING ACID FOR COMPLEXING WITH THE METAL CATION, WHEREBY CATALYTIC ACTIVITY IS INITIATED. 2. A combination of claim 1 in which the metal of said metal salt is selected from the group consisting of lithium, sodium, strontium, and barium. 3. A combination of claim 1 in which the fluoroalkylsulfonyl acid is a fluoroalkane sulfonic acid and the fluoroalkyl group is perfluoroalkyl containing 2 carbons or less. 4. A combination of claim 1 in which the chelating acid is selected from the group consisting of oxalic, phosphoric and phosphorous acids. 5. A combination of claim 1 that further includes up to about 0.6 equivalent per equivalent of said ester reaction product of a buffering compound that has a solubility in the material to be catalyzed of at least 1 part per 1000 parts of the material to be catalyzed, said buffering compound providing a base when dissolved in the material to be catalyzed that associates with the proton of the chelating acid generated by thermal decomposition of said ester reaction product to retard the catalytic activity of the combination. 6. A combination of claim 5 in which the buffering compound is selected from the group consisting of hudroxides, alkoxides, and carboxylates of alkali metals, carboxylates of alkaline-earth metals, and quaternary ammonium hydroxides. 7. A combination of claim 5 in which the buffering compound is selected from the group consisting of carboxylates of barium, strontium and sodium. 8. In combination as a catalyst system soluble in the material to be catalyzed, 1) one equivalent of metal salt selected from the group consisting of lithium, sodium, strontium, and barium salts of a fluoroalkane sulfonic acid; and 2) about 0.2 to about 2 equivalents of thermally decomposable ester reaction product of a tertiary alkyl alcohol and an acid that forms a chelation complex with the metal cation of said metal salt, the ester reaction product decomposiing upon heating to release the chelating acid for complexing with the metal cation, whereby catalytic activity is initiated. 9. A combination of claim 8 in which the chelating acid is selected from the group consisting of oxalic, phosphoric, and phosphorous acids. 10. A combination of claim 8 that further includes up to about 0.6 equivalent per equivalent of said ester reaction product of a buffering compound that has a solubility in the material to be catalyzed of at least 1 part per 100 parts of the material to be catalyzed, said buffering compound providing a base when dissolved in the material to be catalyzed that associates with the proton of the chelating acid generated by thermal decomposition of said ester reaction product to retard the catalytic activity of the combination. 11. In combination as a catalyst system soluble in the material to be catalyzed, 1) one equivalent of barium trifluoromethane sulfonate; and 2) about 0.2 to about 2 equivalents of thermally decomposable ester reaction product of a tertiary alkyl alcohol and an acid selected from the group consisting of oxalic, phosphoric, and phosphorous acids that forms a chelation complex with the barium cation, the ester reaction product decomposing upon heating to release the chelating acid for complexing with the barium cation, whereby catalytic activity is initiated. 12. A combination of claim 11 in which the chelating acid is oxalic acid. |
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