Process for insulating pipes using polyurethane rigid foams by t

Details Process for insulating pipes using polyurethane rigid foams by t Process for insulating pipes using polyurethane rigid foams by t

1995-02-03

1996-12-24

Kuhns, Allan R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 469, 264 53, 264255, 26433116, B29C 4406, B29C 4412

Patent

active

055871178

ABSTRACT:
The invention relates to a process for insulating pipes by applying a rigid polyurethane foam as an insulating layer and optionally an external top coating by the rotational casting process. The rigid polyurethane foam is obtained by a) an aromatic polyisocyanate, b) an organic polyhydroxyl compound, c) an aliphatic, cycloaliphatic or aromatic polyamine and/or polyimine having a molecular weight of from 32 to 1,000 as the cross linking agent in the presence d) a blowing agent, and optionally in the presence of e) known auxiliary substances and additives and in the presence of f) one or more compounds having a molecular weight of from about 166 to about 1,000 and being of the general formula ##STR1## wherein n represents an integer between 2 and 9, preferably 2 and 3,

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patent: 5089561 (1992-02-01), Forgione et al.
patent: 5470515 (1995-11-01), Grimm et al.

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