Non-volatile hot stripper

Claim 2

An aqueous alkaline composition for use at elevated temperatures to remove siccative coatings from substrates coated therewith comprising one or more alkaline compounds in an amount effective to impart a pH to the composition of about 9.5 to about 14+ and at least two of the following three materials: tetrahydrofurfuryl alcohol and the ethoxylated materials of the formula RO(CH.sub.2 CH.sub.2 O).sub.n H wherein R is ##STR2## and n is about 0.5 to about 10, said ingredients being present in amounts effective to remove the siccative coating from a substrate coated therewith.

Claim 3

A composition according to claim 1 wherein the alkaline compound is present in an amount effective to impart a pH to the composition of about 12 to about 14+.

Claim 4

A composition according to claim 1 including a sequestering agent in an amount effective to substantially prevent the formation of precipitants in the composition.

Claim 5

A composition according to claim 3 including a composition-stabilizing compound selected from the group consisting of aliphatic primary alcohols, aliphatic secondary alcohols, alkyl amines, and mixtures thereof, said composition-stabilizing compound being present in an amount effective to substantially prevent separation of said composition.

Claim 6

A composition according to claim 1 including at least about 80 g/l of said alkaline compound, at least about 1 g/l of a sequestering agent, and at least about 10 g/l of a composition-stabilizing compound selected from the group consisting of aliphatic primary alcohols, aliphatic secondary alcohols, alkyl amines and mixtures thereof.

Claim 7

A composition according to claim 5 wherein the ethoxylated material is the reaction product of furfuryl alcohol and wherein n is about 0.5 to 1.5.

Claim 8

A composition according to claim 6 wherein n is about 0.85 to about 1.08.

Claim 9

A composition according to claim 5 wherein the ethoxylated material is the reaction product of tetrahydrofurfuryl alcohol and wherein n is about 3 to about 8.

Claim 10

A composition according to claim 5 wherein the alkaline compound is selected from the group consisting of alkali metal and ammonium hydroxides, carbonates, silicates and phosphates, and amines, and mixtures thereof.

Claim 11

A composition according to claim 5, 6 or 7 wherein the ethoxylated material is present in an amount of at least about 5 g/l.

Claim 12

A composition according to claim 5 including at least about 0.5 g/l of one or more surfactants.

Claim 13

A composition according to claim 1 comprising an alkaline component in an amount of about 150 to about 350 g/l, said alkaline component comprising about 3.5 to about 350 g/l of sodium hydroxide and about 3.5 to about 350 g/l of potassium hydroxide, about 1 to about 100 g/l of a sequestering agent, about 50 to about 100 g/l of a composition-stabilizing compound selected from the group consisting of methanol, monoethanolamine, diethylene glycol, n-butyl amine and mixtures thereof, about 2.5 to about 200 g/l of tetrahydrofurfuryl alcohol, and about 5 to about 200 g/l of an ethoxylated material.

Claim 14

A composition according to claim 12 wherein n is about 0.85 to about 1.08.

Claim 15

A method of stripping siccative coatings from substrates coated therewith comprising contacting the coated substrate with the composition of claim 1, 5 or 12 at a composition temperature effective and a time sufficient to remove the siccative coating from the substrate.

Claim 16

An aqueous concentrate which when added to water at a concentration of about 10 to about 99% by volume produces an aqueous alkaline composition according to claim 1, 5 or 12.

Claim 17

An aqueous concentrate for use in forming an aqueous alkaline solution which is effective at elevated temperatures in stripping siccative coatings from substrates coated therewith, comprising about 10 to about 85 wt. % water, an alkaline component in an amount of about 10 to about 50 wt. %, said alkaline component comprising about 0.5 to about 50 wt. % of sodium hydroxide and about 0.5 to about 50 wt % of potassium hydroxide, about 0.1 to about 10 wt. % of a sequestering agent, about 1 to about 20 wt. % of a composition-stabilizing compound selected from the group consisting of methanol, monoethanolamine, diethylene glycol, n-butyl amine, and mixtures thereof, about 1 to about 10 wt. % of tetrahydrofurfuryl alcohol and about 1 to about 20 wt. % of the reaction product of furfuryl alcohol and ethylene oxide represented by the formula of claim 1 wherein n is about 0.5 to about 1.5.

Claim 18

The concentrate of claim 16 wherein n is about 0.85 to about 1.08.

Claim 19

An aqueous composition for use in replenishing a hot stripper composition, comprising one or more alkaline compounds in an amount of about 1 to about 200 g/l, at least about 200 g/l of tetrahydrofurfuryl alcohol, and an ethoxylated material as defined in claim 1 in an amount of about 20 to about 200 g/l.

Claim 20

A method according to claim 14 wherein the siccative coating is a cathodically electrodeposited paint film.

Claim 21

A composition according to claim 1 wherein the total amount of the ingredients comprising the mixture of at least two of the said materials THFA and said ethoxylated materials is at least about 7.5 g/l, with at least two of said ingredients each being present in an amount of at least about 2.5 g/l.

Claim 22

A composition according to claim 1 including about 4 to about 100 g/l of said tetrahydrofurfuryl alcohol.

Claim 23

A composition according to claim 1 including about 10 to about 100 g/l of said ethoxylated material.