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US 10,865,305 B2Granted
Method of curing a cured-in-place liner
AssigneePipeFusion CIPP Corporation
InventorsRichard E. Nawracaj, Gabriel Urbieta, Radames Dejesus
Life of this patent
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Abstract
Disclosed is a curable composition with enhanced curing time at ambient temperatures, the curable composition including (a) a resin, e.g., 4,4′-isopropylidenediphenol-epichlorohydrin copolymer and (b) one or more curing agents, wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents is from about 12:1 to about 15:1. Also disclosed is a method of curing a cured-in-place liner, wherein the cured-in-place liner contains the above curable composition.
Claims20
A method of curing a cured-in-place liner, wherein the method comprises:
- (i) placing the cured-in-place liner in a pipe and
- (ii) heating the cured-in-place liner,
- wherein the cured-in-place liner contains a curable composition comprising:
- (a) a resin comprising 4,4′-isopropylidenediphenol-epichlorohydrin copolymer and
- (b) one or more curing agents of Formula (I):
- wherein A is —CH2—;
- R is a C1-C3 alkylene chain, wherein the hydroxyl group may be attached to any of the carbon atoms of the alkylene chain;
- R1 and R2 are each independently hydrogen;
- and
- X is a carboxylate anion,
- wherein a ratio of a weight percentage of the resin to a weight percentage of the curing agent or curing agents of formula (I) is from about 12:1 to about 15:1;
- (c) a diluent which is a monofunctional epoxide selected from C12-C14 glycidyl ethers;
- (d) a filler;
- (e) a rheology modifier;
- and
- (f) a defoamer;
- wherein said curable composition has a gel time of about 12 to about 24 hours when cured in a cured-in-place liner at 21° C.
14 more elements
Dependencies are inferred from the claim text.