US PATENT SUBCLASS 528 / 176
.~.~ With polycarboxylic acid or derivative as reactant

Current as of: June, 1999
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528 /   HD   SYNTHETIC RESINS OR NATURAL RUBBERS -- PART OF THE CLASS 520 SERIES

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {23}
86  DF  .~ FROM PHENOL, PHENOL ETHER, OR INORGANIC PHENOLATE {15}
176.~.~ With polycarboxylic acid or derivative as reactant {8}
179  DF  .~.~.~> Polymerizing in the presence of a specified material other than a reactant and other than Group IA or Group IIA material as sole metal atom {2}
183  DF  .~.~.~> Nitrogen reactant contains at least one amino-nitrogen atom {4}
190  DF  .~.~.~> Reactant contains a fused- or bridged-ring other than solely as a polycarboxylic acid anhydride group
191  DF  .~.~.~> Reactant contains a halogen atom other than solely as halogen atom bonded to a carbonyl group
192  DF  .~.~.~> Ethylenically unsaturated reactant
193  DF  .~.~.~> Two or more phenolic reactants
194  DF  .~.~.~> Two or more polycarboxylic acids or derivatives as reactants
195  DF  .~.~.~> Reactant is a nonphenolic compound having at least two hydroxyl groups or salts thereof

DEFINITION

Classification: 528/176

(under subclass 86) Subject matter wherein a phenol, phenol ether, or inorganic phenolate is reacted with a polycarboxylic acid or derivative thereof.

(1) Note. "Derivative" is limited to a nitrile, ester, anhydride, salt, amide, imide, lactam, lactone, and acyl halide. Certain compounds, however, may have more than one function (e.g., a lactone is a species of ester; a lactam isa species of an amide). Compounds which are multifaceted (i.e., more than one function) are classified on the basis of the first-appearing term provided in the subclass hierarchy.

(2) Note. A polycarboxylic acid reactant for purposes of this subclass requires the presence of at least two carboxylic acid groups. A polycarboxylic acid derivative requires at least one carboxylic acid group and at least one carboxylic acid derivative, or at least two identical carboxylic acid derivatives, or at least two different carboxylic acid derivatives. See (1) Note above for an explanation of the term "derivative".

(4) Note. For purposes of this subclass an anhydride having the general formula, which may be linear or cyclic, is considered as being a polycarboxylic acid. Compounds having both a anhydride and a free carboxylic acid group are considered as being a tricarboxylic acid, e.g., as shown below in the first illustration, etc., and compounds containing two anhydride groups are considered as being a tetracarboxylic acid, e.g., as shown below in the second illustration. [figure] [figure]

SEE OR SEARCH THIS CLASS, SUBCLASS:

170, for the reaction of an imide-containing phenolic reactant or for the reaction of a phenolic reactant with an imide-containing reactant.

271, for a more specific definition of the term "carboxylic acid derivative".

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, see the Glossary for a definition of the term "carboxylic acid".