US PATENT SUBCLASS 525 / 197
.~.~.~.~ Specified blending process

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

*  DD  SYNTHETIC RESINS (Class 520, Subclass 1) {4}
50  DF  .~ MIXING OF TWO OR MORE SOLID POLYMERS; MIXING OF SOLID POLYMER OR SICP WITH SICP OR SPFI; MIXING OF SICP WITH AN ETHYLENIC AGENT; MIXING OF SOLID POLYMER WITH A CHEMICAL TREATING OR ETHYLENIC AGENT; OR PROCESSES OF FORMING OR REACTING; OR THE RESULTANT PRODUCT OF ANY OF THE ABOVE OPERATIONS {32}
55  DF  .~.~ At least one solid polymer derived from ethylenic reactants only {25}
191  DF  .~.~.~ Polymer mixture of two or more solid polymers derived from ethylenically unsaturated reactants only; or mixtures of said polymer mixture with a chemical treating agent; or products or processes of preparing any of the above mixtures {23}
197.~.~.~.~ Specified blending process {1}
198  DF  .~.~.~.~.~> With subsequent physical treatment

DEFINITION

Classification: 525/197

Specified blending process:

(under subclass 191) Subject matter drawn to processes which involve specified blending operations associated with preparing the polymeric mixture.

(1) Note. The blending operation must be accompanied by some specific process limitations. Thus, if blending is accomplished by a simple "melt or fusion" blending then it is necessary to state a required temperature range. Similarly, if blending is accomplished by dissolving the polymers in one or more solvents, then it is necessary to specify at least the nature of the solvents, e.g., 2:1 solvent mixture of carbontetrachloride-benzene or 2:1 solvent mixture of halogenated hydrocarbon with aromatic hydrocarbon. In a multistep blending operation which includes heating, it is not necessary that the temperature be specified. Also, permissible are blending processes wherein heating is the only step but which do not disclosed specified temperatures when the polymers or polymer system are required to conform to certain parameters. For example, polymers A and B are heated above their glass transition temperatures (Tg) and then blended; or polymer A is heated to viscosity V1and polymer B is heated viscosity V2 and then blended. Terms such as ".. . blending and heating. . "or".. . mixing and vulcanizing. . ." are specific enough to be classified here. Some indication as to mixing at a given r.p.m. or vulcanizing at a given temperature would be adequate information.

SEE OR SEARCH THIS CLASS, SUBCLASS:

199, through 241, for a product which is the result of a specified blending process.