US4537705A — Aqueous alkaline polyamine paint stripping compos…

Claim 1

Independent Claim 72 words

An alkaline paint remover composition having reduced toxicity and improved heat stability which comprises: an aqueous solution comprising about 2-40% of an alkali metal hydroxide and about 0.2-10% of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is polyoxy(lower)alkylene.

Claim 2

Dependent Claim 72 words

An alkaline paint remover composition having reduced toxicity and improved heat stability which comprises: an aqueous solution comprising about 2-40% of an alkali metal hydroxide and about 0.2-10% of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is polyoxy(lower)alkylene.

Claim 3

Dependent Claim 37 words

The composition of claim 1 wherein X further incorporates a C 3 -C 6 alkylene unit substituted with a unit of the formula [OCH 2 CH(Y)] n N(R 1 )(R 2 ) wherein n is about 1-4.

Claim 4

Dependent Claim 16 words

The composition of claim 1 wherein the polyoxy lower alkylene group comprises about 3-60 alkylene units.

Claim 5

Dependent Claim 35 words

The composition of claim 1 wherein the polyamine is a compound of the formula: H.sub.2 NCH(CH.sub.3)CH.sub.2 [OCH(CH.sub.3)CH.sub.2 ].sub.a (OCH.sub.2 CH.sub.2).sub.b [OCH.sub.2 CH(CH.sub.3)].sub.c NH.sub.2 wherein a+c is about 3-4, and b is about 10 to 50.

Claim 6

Dependent Claim 32 words

The composition of claim 1 wherein the polyamine is a compound of the formula: H.sub.2 NCH(CH.sub.3)CH.sub.2 [OCH(CH.sub.3)CH.sub.2 ].sub.a (OCH.sub.2 CH.sub.2).sub.b [OCH.sub.2 CH(CH.sub.3)].sub.c NH.sub.2 wherein b is 0 and a+c is about 2-35.

Claim 7

Dependent Claim 30 words

The composition of claim 2 wherein the polyamine is a compound of the formula: Z--C(CH.sub.2 [OCH.sub.2 CH(Y)].sub.x NH.sub.2).sub.3 wherein Z is hydrogen, methyl or ethyl, and x is about 2-4.

Claim 8

Dependent Claim 13 words

The composition of claim 6 wherein Y is methyl and Z is ethyl.

Claim 9

Dependent Claim 33 words

The composition of claim 1 which further comprises an effective paint-removing amount of a glycol compound comprising a (lower)alkylene glycol, a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, and mixtures thereof.

Claim 10

Dependent Claim 31 words

The composition of claim 8 wherein the glycol compound is propylene glycol, dipropylene glycol, tripropylene glycol, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, or mixtures thereof.

Claim 11

Dependent Claim 26 words

The composition of claim 9 wherein there are about 1 to 3 parts by weight of the glycol for each part by weight of the polyamine.

Claim 12

Dependent Claim 28 words

The composition of claim 8 which further contains an effective corrosion-inhibiting amount of an alkali metal silicate and an effective amount of an alkali metal detergent builder salt.

Claim 13

Dependent Claim 15 words

The composition of claim 11 which further contains an effective amount of a chelating agent.

Claim 14

Dependent Claim 39 words

The composition of claim 12 comprising about 3-30% of the alkali metal hydroxide, about 1-5% of an alkali metal carbonate, about 1-8% of the chelating agent, about 1-2% of an alkali metal silicate, and about 0.5-5% of the polyamine.

Claim 15

Dependent Claim 14 words

The composition of claim 8 further comprising about 0.1-20% of a phenolic accelerator compound.

Claim 16

Dependent Claim 81 words

A concentrate suitable for dilution with water to form an aqueous alkaline paint remover composition having reduced toxicity and improved heat stability which comprises a major amount of an alkali metal hydroxide and an effective accelerating amount of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is polyoxy(lower)alkylene.

Claim 17

Dependent Claim 81 words

A concentrate suitable for dilution with water to form an aqueous alkaline paint remover composition having reduced toxicity and improved heat stability which comprises a major amount of an alkali metal hydroxide and an effective accelerating amount of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is polyoxy(lower)alkylene.

Claim 18

Dependent Claim 37 words

The concentrate of claim 15 wherein X further incorporates a C 3 -C 6 alkylene unit substituted with a unit of the formula [OCH 2 CH(Y)] n N(R 1 )(R 2 ) wherein n is about 1-4.

Claim 19

Dependent Claim 16 words

The concentrate of claim 15 wherein the polyoxy lower alkylene group comprises about 3-60 alkylene units.

Claim 20

Dependent Claim 35 words

The composition of claim 15 wherein the polyamine is a compound of the formula: H.sub.2 NCH(CH.sub.3)CH.sub.2 [OCH(CH.sub.3)CH.sub.2 ].sub.a (OCH.sub.2 CH.sub.2).sub.b [OCH.sub.2 CH(CH.sub.3)].sub.c NH.sub.2 wherein a+c is about 3-4, and b is about 10 to 50.

Claim 21

Dependent Claim 32 words

The concentrate of claim 15 wherein the polyamine is a compound of the formula: H.sub.2 NCH(CH.sub.3)CH.sub.2 [OCH(CH.sub.3)CH.sub.2 ].sub.a (OCH.sub.2 CH.sub.2).sub.b [OCH.sub.2 CH(CH.sub.3)].sub.c NH.sub.2 wherein b is 0 and a+c is about 2-35.

Claim 22

Dependent Claim 32 words

The concentrate of claim 16 wherein the polyamine is a compound of the formula: Z--C(CH.sub.2 [OCH.sub.2 CH(Y)].sub.x NH.sub.2).sub.3 wherein Z is hydrogen, methyl or ethyl, and x is about 2 to 4.

Claim 23

Dependent Claim 13 words

The concentrate of claim 20 wherein Y is methyl and Z is ethyl.

Claim 24

Dependent Claim 33 words

The concentrate of claim 15 which further comprises an effective paint-removing amount of a glycol compound comprising a (lower)alkylene glycol, a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, and mixtures thereof.

Claim 25

Dependent Claim 31 words

The concentrate of claim 22 wherein the glycol compound is propylene glycol, dipropylene glycol, tripropylene glycol, propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, or mixtures thereof.

Claim 26

Dependent Claim 26 words

The concentrate of claim 23 wherein there are about 1 to 3 parts by weight of the glycol for each part by weight of the polyamine.

Claim 27

Dependent Claim 28 words

The concentrate of claim 22 which further contains an effective corrosion-inhibiting amount of an alkali metal silicate and an effective amount of an alkali metal detergent builder salt.

Claim 28

Dependent Claim 15 words

The concentrate of claim 25 which further contains an effective amount of a chelating agent.

Claim 29

Dependent Claim 43 words

The concentrate of claim 26 comprising about 20-99% of the alkali metal hydroxide, about 5-30% of an alkali metal carbonate, about 3-30% of an alkali metal gluconate, about 2-8% by weight of an alkali metal silicate, and about 0.5-5% of the polyamine compound.

Claim 30

Dependent Claim 11 words

The concentrate of claim 15 wherein the concentrate is a solid.

Claim 31

Dependent Claim 12 words

The concentrate of claim 15 wherein the concentrate is an aqueous solution.

Claim 32

Dependent Claim 94 words

An alkaline paint remover composition having reduced toxicity and improved heat stability which comprises: an aqueous solution comprising about 2-40% of an alkali metal hydroxide, about 0.2-10% of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is C 2 -C 6 alkylene; and an effective paint-removing amount of a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, or mixtures thereof.

Claim 33

Dependent Claim 94 words

An alkaline paint remover composition having reduced toxicity and improved heat stability which comprises: an aqueous solution comprising about 2-40% of an alkali metal hydroxide, about 0.2-10% of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is C 2 -C 6 alkylene; and an effective paint-removing amount of a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, or mixtures thereof.

Claim 34

Dependent Claim 30 words

The alkaline paint remover composition of claim 30 wherein the (lower)alkylene glycol (lower)alkyl ether is propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, or mixtures thereof.

Claim 35

Dependent Claim 107 words

A concentrate suitable for dilution with water to form an aqueous alkaline paint remover composition having reduced toxicity and improved heat stability which comprises a major amount of an alkali metal hydroxide, an effective accelerating amount of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is C 2 -C 6 alkylene; and an effective paint-removing amount of a glycol compound comprising a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, or mixtures thereof.

Claim 36

Dependent Claim 107 words

A concentrate suitable for dilution with water to form an aqueous alkaline paint remover composition having reduced toxicity and improved heat stability which comprises a major amount of an alkali metal hydroxide, an effective accelerating amount of a polyalkylene polyamine of the formula: (R.sub.1)(R.sub.2)NXN(R.sub.1)(R.sub.2) wherein R 1 and R 2 are selected from the group consisting of hydrogen, (lower)alkyl and [CH 2 CH(Y)O] m H, wherein Y is hydrogen or (lower)alkyl and m is about 1-4; and X is C 2 -C 6 alkylene; and an effective paint-removing amount of a glycol compound comprising a (lower)alkylene glycol (lower)alkyl ether, a (lower)alkylene glycol phenyl ether, or mixtures thereof.

Claim 37

Dependent Claim 25 words

The concentrate of claim 32 wherein the glycol compound is propylene glycol monomethyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, or mixtures thereof.

Claim 38

Dependent Claim 51 words

A method for removing a paint film from the surface of an article of manufacture comprising contacting said film with an effective amount of the composition of claim 1, and maintaining the solution in contact with the film for a period of time sufficient to effect substantial loosening of the film.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1988-08-26	1989-02-25	1989-08-27	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1992-08-26	1993-02-25	1993-08-27	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1996-08-26	1997-02-25	1997-08-27	$7700.00	Window Closed / Lapsed

Aqueous alkaline polyamine paint stripping compositions

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