US PATENT SUBCLASS 525 / 89
.~.~.~.~ Mixture contains two or more solid block or block-type copolymers

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}
88  DF  .~.~.~ Mixing of solid block or block-type copolymer with other solid polymer; mixing of said polymer mixture with a chemical treating agent; mixing of a block or block-type copolymer with SICP or with SPFI; or processes of forming or reacting; or the resultant product of any of the above operations {5}
89.~.~.~.~ Mixture contains two or more solid block or block-type copolymers

DEFINITION

Classification: 525/89

Mixture contains two or more solid block or block-type copolymers:

(under subclass 88) Subject matter wherein the mixture contains at least two solid block copolymers or block-type copolymers.

(1) Note. There must be at least one solid polymer derived from ethylenically unsaturated reactants only. However, the required solid polymer from ethylenic reactants only need not be in block- or block-type form. An example of the mixture required for this subclass could consist of solid polyethylene and ethylene oxidebutyrolactone block copolymer. Unless stated to the contrary, in the absence of any disclosure, the polymer block shall be assumed to be a solid when derived from ethylenic reactants only and a liquid when derived other than only from ethylenic reactants.