US PATENT SUBCLASS 526 / 347.2
.~.~.~ Crystalline polystyrene

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {8}
72  DF  .~ POLYMERS FROM ONLY ETHYLENIC MONOMERS OR PROCESSES OF POLYMERIZING, POLYMERIZABLE COMPOSITIONS CONTAINING ONLY ETHYLENIC MONOMERS AS REACTANTS OR PROCESSES OF PREPARING {43}
346  DF  .~.~ From aromatic hydrocarbon {3}
347.2.~.~.~ Crystalline polystyrene

DEFINITION

Classification: 526/347.2

Crystalline polystyrene:

(under subclass 346) Subject matter drawn to crystalline polystyrene:

(1) Note. All polymers prepared in the presence of a transition-metal atom and in the substantial absence of water are included herein unless the disclosure indicates to the contrary that a noncrystalline polymer is formed.

(2) Note. All polymers prepared in the presence of a free-radical catalyst or redox catalyst are excluded herein unless the disclosure indicates that a crystalline polymer is formed.

(3) Note. Any degree of crystalline or isotactic content is sufficient for this subclass.