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:
Aug. 03, 1999
Filed:
Sep. 11, 1996
James Louis Troska, Costa Mesa, CA (US);
Larry McArthur Kegley, League City, TX (US);
William Brian Dances, Ontario, CA (US);
Shell Oil Company, Houston, TX (US);
AC Products, Placentia, CA (US);
Abstract
A low viscosity, low VOC content fumigation adhesive formulation which is comprised of a) 100 parts by weight (pbw) of a blend of a styrene-diene triblock copolymer, hydrogenated or unhydrogenated, having a weight average molecular weight of 30,000 to 200,000 and a polystyrene content of from 10 to 40% by weight of the polymer, and a styrene-diene diblock copolymer having a weight average molecular weight of 10,000 to 40,000 and a polystyrene content of from 10 to 40% by weight of the polymer, wherein the diblock comprises from 60 to 95% by weight of the polymer blend, b) 75 to 275 parts by weight (pbw) of a tackifying resin which is compatible with the diene blocks, and c) 50 to 200 parts by weight (pbw) of a solvent for the polymer. In its preferred embodiment, the invention is the use of SI diblock polymer with a much smaller amount of conventional SEBS or SEPS triblock polymer to produce an extremely low viscosity product which can be processed in the type of equipment presently in use by fumigation adhesive manufacturers and satisfies the VOC standard of 250 grams per liter or less.