Company Filing History:
Years Active: 2007-2015
Title: David Raymond Johnsrud: Innovator in Adhesive Technologies
Introduction
David Raymond Johnsrud is a prominent inventor based in Humble, TX (US). He has made significant contributions to the field of adhesive technologies, holding a total of 15 patents. His work focuses on the development of advanced copolymers that enhance adhesive properties and mechanical strength.
Latest Patents
One of his latest patents is titled "Propylene copolymers for adhesive applications." This invention discloses a multi-component copolymer produced in-reactor, which includes a semi-crystalline component with a crystallinity of 20% or more, and an amorphous component with a crystallinity of 5% or less. The copolymer consists of at least 80 wt % of units derived from propylene and from about 1 to about 20 wt % of units derived from at least one C to C alpha-olefin. The copolymer exhibits a viscosity at 190°C of at least 530 mPa sec and a heat of fusion between about 10 and about 70 J/g. An adhesive containing this copolymer demonstrates a good balance of adhesive properties and mechanical strength.
Another notable patent is "Multiple catalyst system for olefin polymerization and polymers produced therefrom." This invention relates to an adhesive comprising an olefin polymer composition that includes a first amorphous polymer with a crystallinity of 5% or less, prepared with a first catalyst, and a second crystalline polymer with a crystallinity of 20% or more, prepared with a second catalyst. The olefin polymer composition has a Dot T-Peel of 1 Newton or more on Kraft paper, an Mw of at least 7,000 to 80,000, a branching index (g') of from 0.4 to 0.90 measured at the Mz of the polymer composition, and a crystallinity of between 5 and 40%.
Career Highlights
David Johnsrud is currently employed at ExxonMobil Chemical Patents Inc., where he continues to innovate in the field of polymer chemistry. His extensive research and development efforts have led to advancements in adhesive technologies that are widely recognized in the industry.
Collaborations
Throughout his career, David has collaborated with notable colleagues, including Peijun Jiang and Charles Lewis Sims. These collaborations have
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