Appeal No. 2006-2538 Page 2
Application No. 10/140,692
applied at temperatures below 300°F (149°C) can be prepared using low molecular
weight components or a high wax content, application viscosity and adhesive properties
suffer.” Id.
The specification discloses “a hot melt adhesive comprising an adhesive polymer
and a tackifier. Tackifiers required for use in the practice of the invention are modified
rosin[ ] terpenes, preferably phenolic modified rosin-terpenes.” Page 2.
“Rosin is mainly a mixture of C20, tricyclic fused-ring, monocarboxylic acids,
typified by pimaric and abietic acids, which are commonly referred to as ‘resin acids.’”
Page 4. “Terpenes are cyclic, unsaturated, C10 hydrocarbons obtained from the Kraft
process for making paper, turpentines and citrus oils. Examples of terpene compounds
include alpha-pinene, beta-pinene, d-limonene, . . . and the like.” Page 5.
The specification includes a working example describing preparation of a phenol
modified rosin-terpene. Pages 18-19. The exemplary procedure involves dissolving
phenol in a xylene solvent, then adding a catalyst and a mixture of a terpene and a
rosin, also dissolved in xylene.
According to the specification, the modified rosin-terpenes can be mixed with
“[a]ny base polymer suitable for use in formulating hot melt adhesives, as are well
known to those skilled in the art. . . . Such polymers include amorphous polyolefins,
ethylene-containing polymers and rubbery block copolymers.” Page 9.
The resulting hot melt adhesives are said to be “particularly useful in case
sealing applications where exceptionally high heat resistance in addition to cold
resistance is important, i.e., in hot filled packaging applications; e.g. sealing and closing
operations for cartons, cases, or trays used in packaging molten cheese, yogurt or
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Last modified: November 3, 2007