Modified phenolic novolak resins and applications thereof
OwnerRaj B. Durairaj, C. Michael Walkup +1inventors
InventorsRaj B. Durairaj, C. Michael Walkup, Mark A. Lawrence
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Abstract
A modified phenolic novolak resin is prepared by reacting a phenolic compound (e.g., resorcinol) with an aliphatic polyol. The reaction mixture further reacts with a formaldehyde to produce a modified phenolic novolak resin. The reaction is typically carried out in the presence of an acid or a base catalyst. The resulting resin is characterized by a relatively low level of free resorcinol; and rubber compounds containing the resin exhibit low fuming, lower Mooney viscosity (which means better processing), better dynamic stiffness properties (G′), and/or good tear properties. Therefore, the resulting resin can be used as a methylene acceptor compound in a vulcanizable rubber composition.
Claims47
A modified phenolic novolak resin obtained by reacting a phenolic compound with an aliphatic polyol and an aldehyde in the presence of an acid catalyst at a pH less than 7.
A vulcanizable rubber composition, comprising (a) a rubber component selected from natural rubber, synthetic rubber or combinations thereof, (b) a methylene donor compound which generates formaldehyde upon heating, and (c) a methylene acceptor compound comprising a modified phenolic novolak resin obtained by reacting a phenolic compound with an aliphatic polyol and an aldehyde in the presence of an acid catalyst at a pH less than 7.
A process for making a modified phenolic novolak resin, comprising the step of reacting a phenolic compound with an aliphatic polyol and an aldehyde in the presence of an acid catalyst at a pH less than 7.
A modified phenolic novolak resin obtainable by reacting a unsubstituted or substituted resorcinol with an aliphatic polyol and an aldehyde in the presence of an acid catalyst.
Dependencies are inferred from the claim text.