C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
C08L 29/02 (2006.01) C07C 265/14 (2006.01) C08G 18/72 (2006.01) E02B 3/12 (2006.01) E02B 5/02 (2006.01)
Patent
CA 2142758
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.
Adam Norbert J.
Lefebvre Jerome
Corporation Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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