Urethane-modified novolaks for increasing the steel cord adhesion and rigidity of vulcanized rubber blends
AssigneeVianora Resins GmbH
InventorsThomas Burkhart, Siegfried Wallenwein, Gerhard Brindoepke, Gerd Walz
Life of this patent
Estimating the term…
Abstract
Urethane-modified novolaks which are prepared by simultaneous reaction of a monohydric or polyhydric phenol (A) with an oxo compound (aldehyde or ketone) (B) and a urethane (C) in the presence of an acidic catalyst (D) at an elevated temperature of 60.degree. to 200.degree. C. and contain no interfering amounts of free starting phenol, and their use as adhesion improvers in rubbers, in particular rubbers containing reinforcing media such as steel cord or textile fibers.
Claims22
A urethane-modified novolak which is prepared by a simultaneous reaction of components comprising:
- A. a monohydric or polyhydric phenol,
- B. an oxo compound and
- C. a monomeric urethane, in the presence of (D) an acidic catalyst at an elevated temperature of about 60.degree. to about 200.degree. C. and which contains no interfering amounts of free starting phenol.
A urethane-modified novolak comprising reaction product of components comprising:
- A. a phenolic compound,
- B. an oxo compound and
- C. a monomeric urethane, in the presence of (D) an acidic catalyst at an elevated temperature in a range of about 60.degree. to about 200 .degree. C., the urethane-modified novolak being essentially free of unreacted component (A).
A urethane-modified novolak comprising a reaction product of components comprising:
- A. a phenolic compound,
- B. an oxo compound and
- C. a monomeric urethane comprising a carbamic acid ester of a dihydric or polyhydric alcohol having 2 to 20 carbon atoms, in the presence of (D) an acidic catalyst at a temperature of about 60.degree. to about 200.degree. C., the urethane-modified novolak being essentially free of unreacted component (A).
Dependencies are inferred from the claim text.