US PATENT SUBCLASS 525 / 88
.~.~.~ 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

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.~.~.~ 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  DF  .~.~.~.~> Mixture contains two or more solid block or block-type copolymers
90  DF  .~.~.~.~> Mixture contains solid block copolymer wherein at least one block is derived from ethylenic reactants only and at least one block is derived from at least one saturated reactant {1}
92 R  DF  .~.~.~.~> Mixture contains solid polymer derived from at least one saturated reactant, SICP, or SPFI {12}
93  DF  .~.~.~.~> Mixture contains solid polymer derived from reactant containing chalcogen {1}
95  DF  .~.~.~.~> Mixture contains solid block or block-type copolymer derived from ethylenically unsaturated hydrocarbon reactants only at least one of which contains at least four carbon atoms {3}

DEFINITION

Classification: 525/88

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 specified intermediate condensation product or with specified polymer-forming ingredients; or processes of forming or reacting; or the resultant product of any of the above operations:

(under subclass 55) Subject matter which involves the mixing of a solid block or block-type copolymers with other solid polymer(s); mixing of said polymer mixture with a chemical treating agent; mixing of block or block-type copolymer with a specified intermediate condensation product or with specified polymerforming ingredients or their polymers; or processes of mixing or forming; or the resultant product of any of the above mixtures.

(1) Note. For purposes of classification a polymer is classified as:

(A)

A block copolymer when

1. The structure is given, i.e., to a long polymer backbone is attached or coupled to one or both of its terminal ends one or more chemically dissimilar polymers at least three reactant units in length or,

2. the copolymer is named as a block providing that the disclosure is otherwise silent as to its structure or, if the structure is likewise given, it is consistent with that described above or,

3. the structure can be ascertained from the following limiting process conditions: (a)

Treating a nonterminated solid polymer, that is, one which is terminally active or "living", with an ethylenic reactant with subsequent polymerization to form additional blocks. The process may be continued to produce higher order block copolymers. For example, treating dilithiated polystyrene with butadiene to yield an ABA block copolymer.

(b)

Two or more chemically dissimilar nonidentical solid polymer chain ends are coupled directly or through the use of a chemical agent. For example, the coupling of hydroxy-terminated solid polybutadiene with hydroxy terminated polyethylene glycol terephthalate using phosgene.

(B)

A block-type copolymer when

1. The structure is given, i.e., to a long solid polymer backbone possessing terminally active sites, e.g., contains functional groups or is a "living polymer", etc., is attached or coupled through chemical reaction with those functional groups or sites an ethylenic reactant containing one or more functional groups or sites, for example, contacting hydroxy terminated polybutadiene with allyl isocyanate or,

2. two or more identical solid polymer chain ends are coupled directly or through the use of a chemical agent. For purposes here, identical means those polymer segments which contain the same backbone but differ (e.g., in stereoregularity, isotacticity syndiotacticity, atacticity, optical activity, or degree of polymerization). Thus, coupling lithium terminated polystyrene segments with molecular weights of 25,000 and 100,000 respectively with stannic chloride is proper for this subclass.

Failure to meet one or more of these requirements, the reaction is considered to produce a polymeric blend. For example, contacting lithium terminated polystyrene with ethylene oxide followed by blending with polyacrylic acid places the product blend in subclass 221.

(2) Note. Patents which describe the aftertreatment of solid polymer from ethylenic reactants only with a nonethylenic agent are classified according to the reactants first leading to formation of the solid polymer. However, if the aftertreating agent is an ethylenic reactant, it is given equal weight with these reactants used in making the solid polymer.

SEE OR SEARCH THIS CLASS, SUBCLASS: 191+, for a product wherein the same solid polymer from ethylenic reactants only is coupled utilizing a coupling agent and subsequently blended with a different solid polymer derived from ethylenic reactants only.

SEE OR SEARCH CLASS

520, Synthetic Resins or Natural Rubbers, the Glossary, for the definitions of the terms "specified intermediate condensation product" and "specified polymer-forming ingredients".