DR. MICHAEL JOHN MARTIN, D.C
Chiropractic at Hamline Ave, Saint Paul, MN

4960831, Oct 2, 1990

Aug 24, 1989

7/398298

Carl L. Willis - Houston TX
Michael F. Conway - Houston TX
Michael K. Martin - Woodbury MN

Shell Oil Company - Houston TX

C08F 810, C08C 1928

525250

Elastomeric polymers comprising at least one alkali metal atom are modified by incorporating at least one group capable of sterically hindering coupling reactions which frequently occur when functional groups are subsequently incorporated into such polymers. In general, the group capable of sterically hindering coupling reactions may be incorporated by reacting the elastomeric polymer comprising at least one alkali metal atom with a compound containing a group capable of reacting with the elastomeric polymer at one end and at least one pendant group larger than hydrogen at the other. Groups that will react with elastomeric polymers comprising at least one alkali-metal atom are of course, well known, in the art, and include groups containing sulfur, oxygen, nitrogen and the like and ethylenically and acetylenically unsaturated groups. Compounds containing terminal ethylenically unsaturated groups are particularly useful in preparing the modified elastomeric polymers of this invention. Terminal groups capable of sterically hindering coupling reactions, generally, include all groups larger than hydrogen.

4726982, Feb 23, 1988

Apr 10, 1987

7/036589

William J. Traynor - Cottage Grove MN
Cheryl L. Moore - Afton MN
Michael K. Martin - Woodbury MN
John D. Moon - Hastings MN

Minnesota Mining and Manufacturing Company - St. Paul MN

B32B 702, B32B 710, C08L 5106

428213

A pressure-sensitive adhesive that has high cohesive strength and adheres permanently to high-solids automotive paint systems preferably comprises a mixture of (1) a crosslinked acrylic copolymer of acrylic acid ester and N-vinyl-2-pyrrolidone, and (2) certain tackifier resins. Useful tackifier resins are poly(isobornylmethacrylate), pentaerythritol ester of rosin, and mixed-aliphatic/aromatic polymeric tackifier resins such as a t-butylated styrene. The tackifier resin preferably has a T. sub. g of at least 30. degree. C. , M. sub. n from 300 to 3000, and a solubility parameter from 8 to 9. The novel pressure-sensitive adhesive is particularly useful as a dense surface layer of a composite tape having a foamlike core.