Oxygen tolerant and room temperature raft through alkylborane initiation

    公开(公告)号:US11667734B2

    公开(公告)日:2023-06-06

    申请号:US16785162

    申请日:2020-02-07

    申请人: DREXEL UNIVERSITY

    摘要: A polymerization method including radically polymerizing a monomer in a polymerization medium comprising a chain transfer agent, and a free radical initiator prepared by oxidizing a reaction product of a ligand-reactive decomplexation agent and an alkyl-borane complex of the formula:




    wherein R1, R2, and R3 are independently selected from hydrogen, an alkyl group containing from 1 to 12 carbon atoms, a cycloalkyl group containing from 3-12 carbon atoms, and an aryl group containing from 6 to 12 carbon atoms, wherein the aryl group may be optionally substituted with an alkyl group having from 1 to 10 carbon atoms, and at least one of R1, R2, and R3 is an alkyl group, a cycloalkyl group or an aryl group, and L is a complexing agent selected from one or more amine groups, amidine groups, hydroxide groups, alkoxyl groups, alkyl ether groups, alkoxide groups and mixtures thereof.

    Method for producing oxymethylene polymer and oxymethylene polymer resin composition

    公开(公告)号:US11326051B2

    公开(公告)日:2022-05-10

    申请号:US17293566

    申请日:2020-06-10

    摘要: It has been desired to develop a method for producing an oxymethylene polymer, by which an oxymethylene polymer having a high polymerization degree can be produced with high efficiency while suppressing increase in the amount of generation of an odor. Further, it has been desired to develop an oxymethylene polymer resin composition, wherein generation of an odor at the time of molding or after molded to obtain a molded body is suppressed. The present invention provides a method for producing an oxymethylene polymer, wherein the oxymethylene polymer is produced by polymerizing a cyclic oligomer of formaldehyde, and wherein a boron trifluoride compound and an aryl fluoride boron compound are used as polymerization catalysts. The present invention also provides an oxymethylene polymer resin composition containing an oxymethylene polymer and a derivative of an aryl fluoride boron compound.