Appeal No. 1996-2113
Application No. 08/192,220
ingredient in the base rubber formulation. See Hill, col. 3,
ll. 4-17; New, col. 3, ll. 50-57; col. 4, ll. 28-37; and
Kilbourne, col. 2, ll. 51-69. None of these primary
references disclose or suggest an acid ingredient that is
reactive with the first reactive ingredient of claim 1, i.e.,
dihydroquinolines.
Parker discloses 2,2,4-trimethyl-1,2-dihydroquinoline
(TMDQ) which is blocked with an acidic blocking agent before
reaction with a vinyl aromatic polymer (e.g., styrene) to
produce an antioxidant product with an outstanding lack of
bloom to the surface of the rubber article. See Parker, col.3
3, ll. 31-49; col. 5, ll. 17-30; and col. 5, ll. 65-67.
Parker also discloses that dihydroquinolines may be prepared
by the well known reaction of an aliphatic ketone with a
primary aromatic amine (col. 5, ll. 40-46). However, Parker
teaches that the acidic blocking agent must be removed to
effect the stabilizing or antioxidant property of this
reaction product (col. 6, ll. 10-13). Therefore the acid
3Soluble sulfur is known to migrate to the surface of
uncured rubber articles and migration of this sort is called
sulfur “bloom.” See appellants’ specification, page 2, ll.
14-16.
5
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