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US 6,472,457 B1Granted
Nonformaldehyde, nonfuming resorcinolic resins and methods of making and using the same
AssigneeIndspec Chemical Corporation
InventorsRaj B. Durairaj, Alex Peterson, Jr.
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Abstract
Methods for preparing formaldehyde-free resorcinol resins are disclosed. The methods generally comprise reacting resorcinol first with dicyclopentadiene and then reacting that mixture with an olefinic compound. The resins produced by this method are also disclosed, as are rubber compositions utilizing the present resins. The resins are characterized as having a free resorcinol content of about 1 wt. % or less, and yielding a suitable softening point when used in rubber applications.
Claims24
A method for synthesizing a nonformaldehyde resorcinolic resin comprising:
- a) mixing an acid catalyst with melted resorcinol;
- b) adding dicyclopentadiene to the mixture of step a);
- c) adding an acid catalyst to the mixture of step b);
- and
- d) adding an olefinic compound to the mixture of step c);
- wherein for every mole of resorcinol used, at least about 0.25 moles of dicyclopentadiene is used and at least about 0.9 moles of olefinic compound is used.
3 more elements
Dependencies are inferred from the claim text.