US PATENT SUBCLASS 528 / 272
.~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof

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}
271  DF  .~ FROM CARBOXYLIC ACID OR DERIVATIVE THEREOF {10}
272.~.~ From di- or higher ester of a polycarboxylic acid as sole reactant, or from a polycarboxylic acid or derivative with a compound containing two or more hydroxyl groups or salts thereof {15}
274  DF  .~.~.~> Polymerizing in the presence of a specified material other than reactant {2}
287  DF  .~.~.~> Phosphorus-containing reactant
288  DF  .~.~.~> Nitrogen-containing reactant {4}
293  DF  .~.~.~> Sulfur-containing reactant {2}
295.3  DF  .~.~.~> Polycarboxylic acid reactant which is a dimer or trimer of an ethylenically unsaturated aliphatic monocarboxylic acid having at least ten carbon atoms; or adduct of said unsaturated monocarboxylic acid with an alpha, beta ethylenically unsaturated carboxylic acid or derivative
295.5  DF  .~.~.~> Reactant which is a fatty acid glycerol ester, a fatty acid or salt derived from a naturally occurring glyceride, tall oil, or a fatty acid derived from tall oil
296  DF  .~.~.~> Reactant contains three or more carboxylic acid groups or is derivative thereof
297  DF  .~.~.~> 1,2-epoxy containing reactant
298  DF  .~.~.~> Fused- or bridged-ring-containing reactant other than solely as cyclic acid anhydride group
299  DF  .~.~.~> Halogen-containing reactant other than solely as halogen atom bonded to a carbonyl group
300  DF  .~.~.~> Polyhydroxy-containing compound or salt thereof having an ether-oxygen atom as reactant {1}
302  DF  .~.~.~> Two or more carboxylic acid or derivatives or mixtures thereof {2}
306  DF  .~.~.~> Ethylenically unsaturated carboxylic acid or derivative of an ethylenically unsaturated carboxylic acid
307  DF  .~.~.~> Cycloaliphatic ring-containing reactant (other than aryl)
308  DF  .~.~.~> Aryl-containing carboxylic acid or derivative of an aryl-containing dicarboxylic acid {2}

DEFINITION

Classification: 528/272

(under subclass 271) Subject matter involving a polymer derived (1) from one or more di- or higher esters of a polycarboxylic acid as the sole reactant or reactants, or (2) from at least a polycarboxylic acid or derivative thereof and at least a compound containing two or more hydroxyl groups or salts thereof.

(1) Note. A hydroxyl group denotes the bonding of an -OH group to a carbon atom and wherein the carbon atom is not double bonded to oxygen, sulfur, selenium, or tellurium, or triple bonded to nitrogen.

(2) Note. A compound containing two or more hydroxyl groups or salts thereof requires (a) at least two distinct -OH or salt groups bonded to different carbon atoms, e.g., HO-CH2-CH2-OH, etc., or (b) two or more -OH or salt groups bonded to the same carbon atom, e.g., [figure] [caption]etc.

(3) Note. A compound which contains a single C-OH group and a single C-O salt group is proper for this subclass.

(4) Note. A claim which recites the aftertreatment of a solid polymer wherein no preparation of said polymer is claimed is not proper for this subclass. See Search Notes, infra.

SEE OR SEARCH THIS CLASS, SUBCLASS:

481, for (a) the process of heating particles of polyethlene terephthalate at 250 deg.C in an affluent gaseous stream of nitrogen to increase the polymer's molecular weight. and (2) the process of condensing a polyester precondensate havinga relative viscosity of 1.05-1.15 at 220 deg.C-280 deg.&KHgr; &ugr;&ngr;δϵρ ρϵδ&ugr;χϵδ &pgr;ρϵσσ&ugr;ρϵ. SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, II, B, 2 in the class definition for a definition of what constitutes a solid polymer. Also, terms such as relative viscosity, intrinsic viscosity and polymer melt also connote a solid polymer.

525, Synthetic Resins or Natural Rubbers,

437, for heating of solid polyethylene terephthalate in the presence of P2O5[end subscrpt] dehydrating agent.