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:
Jun. 06, 1995
Filed:
Apr. 07, 1994
Norbert J Adam, Pittsburgh, PA (US);
Jerome B LeFebvre, Aliquippa, PA (US);
Miles Inc., Pittsburgh, PA (US);
Abstract
The invention is directed to a process of forming a ditch liner by dispensing a solidifiable liquid mixture onto a continuously moving porous blanket, applying pressure against the mixture and the coated blanket to form a continuous matrix within the blanket, laying the resulting coated blanket into a ditch before the liquid mixture has fully cured, conforming the coated blanket to the shape of the ditch, and allowing the mixture to fully cure. The improvement resides in using a reaction mixture of a polyisocyanate, up to 60% by weight of a filler, a specified polyol mixture and, optionally, a catalyst. The polyol mixture requires three different propylene oxide adducts: i) a propylene oxide adduct of an alkanolamine, ii) a propylene oxide adduct of a low molecular weight organic compound having from 3 to 8 OH groups, and iii) a propylene oxide adduct of a low molecular weight diol. The amounts of ii) and iii) are such that the mixture of ii) and iii) has an average OH functionality of from more than 2 to less than 2.8.