Patents Represented by Attorney Louis J. Young

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  • Semi-continuous process for making star-block copolymers
    Patent number: 4390663
    Abstract: A semi-continuous process for the preparation of star-block copolymers of 60 to 90% by weight of monovinyl aromatic compound and 10 to 40% by weight of conjugated diene monomer has been developed. The process reduces the time needed to produce the copolymer by shortening reaction time and eliminating the need for costly cleanout between runs. Novel star-block copolymers are prepared which have bimodal arm structures containing a series of tapered copolymer segments.
    Type: Grant
    Filed: February 24, 1982
    Date of Patent: June 28, 1983
    Assignee: Atlantic Richfield Company
    Inventor: Harold L. Nicholson