×

Preparation and polymerization of initiators containing multiple oxetane rings: new routes to star polymers

  • US 5,663,289 A
  • Filed: 10/28/1994
  • Issued: 09/02/1997
  • Est. Priority Date: 12/11/1992
  • Status: Expired due to Fees
First Claim
Patent Images

1. A process for the preparation of a star polymer, said process comprising:

  • (a) forming an initiator compound by reacting a preinitiator precursor with a catalyst, said preinitiator precursor being an organic compound that forms an adduct with said catalyst, and said catalyst being a substance that causes cationic polymerization;

    (b) combining said initiator compound with a multioxetane compound to form an initiating species;

    said multioxetane compound having the general formula ##STR16## in which;

    R1 and R2 are members independently selected from the group consisting of H, lower alkyl, lower alkoxy, Br, Cl, I, NF2, ONO2, NO2, N3, and N(R3)NO2, where R3 is H or a lower alkyl; and

    n is an integer having a value ranging from 1 to 8;

    (c) contacting said initiating species with a monomer that undergoes cationic polymerization; and

    (d) allowing polymerization to proceed by chain elongation until the supply of available monomer is substantially exhausted.

View all claims
  • 6 Assignments
Timeline View
Assignment View
    ×
    ×