| 摘要 |
GRADIENT POLYMERS OF TWO OR MORE CYCLIC, ORGANIC, RING-OPENING, ADDITION POLYMERIZABLE MONOMERS AND METHODS FOR MAKING SAME Polymers of at least two different cyclic organic monomers capable of ring-opening, addition polymerization with themselves and each other. The polymers comprise polymer chains along which the proportion of mer units provided by a first monomer of the type described gradually increases in a given chain length as the proportion of mer units provided by a second monomer of the type described gradually decreases along said chain length. In one form the portions of the polymers adjacent one end of the given chain lengths have substantially 100% of mer units provided by the first monomer and substantially 0% of mer units provided by the second monomer. In a further form, the portions of the polymers adjacent one end of the given chain lengths have about 100% of mer units provided by the first monomer and about 0% of mer units provided by the second monomer and the portions adjacent the other end of the given chain lengths have about 0% of mer units provided by the first monomer and about 100% of mer units provided by the second monomer. In another form, the polymers also contain a second chain length along which the proportion of mer units provided by the first and second monomers, respectively, remain substantially constant. In a still further form, the polymers also comprise third chain lengths connected to the second chain lengths along which the proportion of mer units provided by the first monomer gradually increases as the proportion of mer units provided by the second monomer gradually decreases. Additional forms of polymers are disclosed. Process for producing such polymers comprising introducing at least one primary polymerizable feed composition comprising at least one of the monomers described above from at least one primary feed source to a polymerization zone, the primary polymerizable feed composition continually varying in compositional content of the monomers therein during said continuous introduction; simultaneously adding to primary feed source at least one different secondary polymerizable feed composition comprising at least one different monomer as described above from at least one secondary feed source so as to continually change the compositional content of the polymerizable monomers in the primary polymerizable feed composition in the primary feed source; and continuously polymerizing the primary polymerizable feed composition introduced to the polymerization zone until desired polymerization has been achieved. S P E C I F I C A T I O N |
