US PATENT SUBCLASS 530 / 214
.~.~ Diels-Alder adducts (e.g., of maleic anhydride, fumaric acid, etc., with conjugated dienes, such as rosin acids, terpenes, etc.)

Current as of: June, 1999
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530 /   HD   CHEMISTRY: NATURAL RESINS OR DERIVATIVES; PEPTIDES OR PROTEINS; LIGNINS OR REACTION PRODUCTS THEREOF

200  DF  NATURAL RESINS OR DERIVATIVES (E.G., WOOD OR PINE TAR; CATIVO RESIN DERIVATIVES, ETC.) {6}
210  DF  .~ Rosin or derivative used as starting material in process, or product thereof (e.g., using gum rosin, wood rosin, solid tall oil rosin, etc.) {10}
214.~.~ Diels-Alder adducts (e.g., of maleic anhydride, fumaric acid, etc., with conjugated dienes, such as rosin acids, terpenes, etc.)

DEFINITION

Classification: 530/214

(under subclass 210) Products which include a six-membered ring formed by the addition of an alkene or alkyne to the 1,4 - positions of a conjugated diene.

(1) Note. An example of such a reaction may be represented as follows: [figure]

(2) Note. All adducts included in this class are mixtures formed from the mixed hydrophenanthrene acids or derivatives thereof present in rosin. An example of an adduct of an individual rosin acid with fumaric acid is: [figure]