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:
Sep. 12, 1995
Filed:
Feb. 06, 1995
Todd J Green, Canton, MI (US);
BASF Corporation, Mt. Olive, NJ (US);
Abstract
There is now provided a rigid closed cell polyisocyanate based foam for use as a positive flotation material for watercraft which meets the U.S. Coast Guard immersion test (CGD 75-168, 33 C.F.R. .sctn.183.114). As a blowing agent for this foam, a mixture of 1,1,1,2-tetrafluoroethane (R-134a) as a frothing agent and water is used, where the amount of water is less than 2.5 weight percent based on the weight of the formulated polyol composition. Also, in preferable embodiments, the polyols in the polyol composition are initiated by at least one amine; and the polyol composition contains a delayed action tertiary amine catalyst. The foams used in the invention have excellent dimensional stability. In another embodiment, there is also provided a formulated polyol composition of R-134a and a polyol composition having an average OH# of less than 400 and an average functionality of greater than 4 using R-134a and less than 2.5 wt. % of water, where the isocyanate and the formulated polyol composition are reacted in a weight ratio of 0.9:1 to 1.3:1, to provide a dimensionally stable foam for use as a flotation foam in watercraft.