# US 10,865,305 B2 · Method of curing a cured-in-place liner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,865,305 B2 - Document ID: US10865305B2 - Status: Granted - Kind: B2 - Application number: 16/885,611 - Filed: 2020-05-28 - Published: 2020-09-17 - Granted: 2020-12-15 - Earliest claimed: 2018-09-07 - Assignees: PipeFusion CIPP Corporation - Applicants: PipeFusion CIPP Corporation - Inventors: Richard E. Nawracaj; Gabriel Urbieta; Radames Dejesus - Web page: https://patentgrep.com/patent/US10865305B2 ## CPC - C08L 63/00: Compositions of epoxy resins; Compositions of derivatives of epoxy resins - C08J 3/075: Macromolecular gels - C08K 5/357: Six-membered rings - C08L 63/04: Epoxynovolacs - G06Q 20/38215: {Use of certificates or encrypted proofs of transaction rights} - H04L 9/3213: {using tickets or tokens, e.g. Kerberos (network architectures or network communication protocols for entities authentication using tickets in a packet data network H04L63/0807)} - H04L 9/3228: {One-time or temporary data, i.e. information which is sent for every authentication or authorization, e.g. one-time-password, one-time-token or one-time-key} - H04L 9/3234: {involving additional secure or trusted devices, e.g. TPM, smartcard, USB or software token (network architectures or network communication protocols for supporting authentication of entities using an additional device in a packet data network H04L63/0853)} - C08J 2363/00: Characterised by the use of epoxy resins; Derivatives of epoxy resins - C08L 2203/18: used for pipes - H04L 2209/56: Financial cryptography, e.g. electronic payment or e-cash - C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06) - C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29) - C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09) - G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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. ## Claims ### Claim 1 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. ### Claim 2 (depends on 1) The method of claim 1, wherein X is the carboxylate anion of a carboxylic acid comprising from 1 to about 40 carbon atoms. ### Claim 3 (depends on 1) The method of claim 1, wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents of formula (I) is from about 12:1 to about 14:1. ### Claim 4 (depends on 3) The method of claim 3, wherein the ratio of the weight percentage of the resin to the weight percentage of the curing agent or curing agents of formula (I) is about 12:1. ### Claim 5 (depends on 1) The method of claim 1, wherein the composition requires a temperature of at least about 85° C. to begin a curing process. ### Claim 6 (depends on 1) The method of claim 1, wherein the composition begins a curing process at a temperature of about 60° C. to about 85° C. ### Claim 7 (depends on 1) The method of claim 1, wherein the composition has a gel time of about 14 hours to about 22 hours at a temperature of 21° C. ### Claim 8 (depends on 7) The method of claim 7, wherein the composition has a gel time of about 16 hours to about 20 hours at a temperature of 21° C. ### Claim 9 (depends on 1) The method of claim 1, wherein the curing agent is a carboxylate of an amine selected from N-hydroxypropylpiperidine, N-hydroxymethylpiperidine, N-hydroxyethylpiperidine, and combinations thereof. ### Claim 10 (depends on 9) The method of claim 9, wherein the carboxylate is a carboxylate anion of an acid selected from tall oil fatty acid (TOFA), oleic acid, acetic acid, propanoic acid, 2-ethylhexanoic acid, decanoic acid, and hexanoic acid, succinic acid, glutaric acid, adipic acid, and pimelic acid. ### Claim 11 (depends on 9) The method of claim 9, 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 12:1 to 15:1. ### Claim 12 (depends on 9) The method of claim 9, 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 12:1 to 13:1. ### Claim 13 (depends on 9) The method of claim 9, wherein the curing agent is a carboxylate of an amine selected from N-hydroxymethylpiperidine, N-hydroxyethylpiperidine, and combinations thereof. ### Claim 14 (depends on 13) The method of claim 13, 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 12:1 to 13:1. ### Claim 15 (depends on 13) The method of claim 13, wherein the curing agent is a carboxylate of N-hydroxyethylpiperidine. ### Claim 16 (depends on 15) The method of claim 15, 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 12:1 to 13:1. ### Claim 17 (depends on 15) The method of claim 15, wherein the cured-in-place liner is heated to a temperature of at least about 85° C. ### Claim 18 (depends on 17) The method of claim 17, wherein the cured-in-place liner is heated to a temperature of about 60° C. to about 85° C. ### Claim 19 (depends on 1) The method of claim 1, wherein the cured-in-place liner is heated to a temperature of at least about 85° C. ### Claim 20 (depends on 19) The method of claim 19, wherein the cured-in-place liner is heated to a temperature of about 60° C. to about 85° C.