The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 06, 1999
Filed:
Sep. 30, 1997
David Romme Hansen, Houston, TX (US);
Ralf Korpman, Yalaha, FL (US);
Shell Oil Company, Houston, TX (US);
Abstract
A pressure sensitive adhesive composition for skin adhesion and bandage applications which comprises (a) 100 parts by weight of a styrene-isoprene-styrene triblock or multiarm copolymer which has a coupling efficiency of 20 to 50%, an overall absolute arm molecular weight of 33,000 to 100,000, a polystyrene content of 18 to 30%, and a polystyrene block weight average molecular weight of 11,000 to 20,000, and (b) from 100 to 400 parts by weight of a styrene-isoprene diblock copolymer which has an overall absolute molecular weight of 20,000 to 40,000, a polystyrene content of 10 to 25%, and a polystyrene block weight average molecular weight of 4000 to 7000.