Color preservation of wax-coated paperboard

Claim 2

An improved wax-coated cellulosic product which comprises a paper or paperboard substrate bearing in order: (1) an intermediate layer consisting essentially of a mixture of (A) a fluorinated organic phosphate compound of the formula (R.sub.f L).sub.3 -yZ wherein R f is R 2 (CF 2 ) a where R 2 is F or H and a is an integer from 1 to 20, (CF 3 ) 2 CR 3 (CF 2 ) b where R 3 is F or H when b is O and R 3 is F when b is an integer from 1 to 18, or R 4 (c-C 6 F 10 ) where R 4 is F or C n F 2n+1 in which n is an integer from 1 to 4 and c-designates an alicyclic structure, L is ##STR4## where R 5 is an alkyl group having from 1 to 10 carbon atoms, or the group --(CH.sub.2).sub.n O-- where n is a integer 1 or 2, y is an integer 1 or 2, and Z is P(O)(OM) x where x is the integer 1 or 2, and M is a water-solubilizing cation selected from the group consisting of alkali metal, ammonium and substituted ammonium when x is 1, and each M is independently selected from the group consisting of hydrogen, alkali metal, ammonium and substituted ammonium when x is 2, in an amount of between about 0.01 to about 0.12 pounds per thousand square feet of said intermediate layer and (B) a nonionic surfactant of the poly(oxypropylene)poly(oxyethylene) block copolymer type in an amount of between about 0.015 and about 0.18 pounds per thousand square feet of said intermediate layer; and (2) an outer layer of wax.

Claim 3

The improved wax-coated cellulosic product of claim 1, wherein the fluorinated organic phosphate is present in said intermediate layer in a amount of between about 0.025 and about 0.038 pounds per thousand square feet.

Claim 4

The improved wax-coated cellulosic product of claim 1, wherein the fluorinated organic compound has the formula ##STR5##

Claim 5

The improved wax-coated cellulosic product of claim 3, wherein the nonionic surfactant is present in said intermediate layer in an amount of between about 0.08 and about 0.12 pounds per thousand square feet.

Claim 6

The improved wax-coated cellulosic product of claim 2, wherein the nonionic surfactant is of the type prepared by the sequential addition of ethylene oxide followed by propylene oxide to an ethylene glycol base.

Claim 7

The improved wax-coated cellulosic product of claim 5, wherein the substrate is corrugated paperboard.

Claim 8

A process for preparing an improved wax-coated cellulosic product which comprises the steps of: (1) providing a paper or paperboard substrate: (2) coating the substrate with a mixture consisting essentially of (A) a fluorinated organic phosphate having the formula (R.sub.f L).sub.3-y Z wherein R f is R 2 (CF 2 ) a where R 2 is F or H and a is an integer from 1 to 20, (CF 3 ) 2 CR 3 (CF 2 ) b where R 3 is F or H when b is O and R 3 is F when b is an integer from 1 to 18, or R 4 (c-C 6 F 10 ) where R 4 is F or C n F 2n+1 in which n is an integer from 1 to 4 and c-designates an alicyclic structure, L is ##STR6## where R 5 is an alkyl group having from 1 to 10 carbon atoms, or the group --(CH.sub.2).sub.n O-- where n is an integer 1 or 2, y is an integer 1 or 1, and Z is P(O)(OM) x where x is the integer 1 or 2, and M is a water-solubilizing cation selected from the group consisting of alkali metal, ammonium and substituted ammonium when x is 1, and each M is independently selected from the group consisting of hydrogen, alkali metal, ammonium and substituted ammonium when x is 2, in an amount of between about 0.01 and about 0.2 pounds, per thousand square feet, and (B) a poly(oxypropylene)poly(oxethylene)block copolymer surfactant in an amount of between about 0.015 and about 0.18 pounds per thousand square feet of said intermediate layer and drying the resulting coated substrate; and (3) coating said coated substrate with molten wax.

Claim 9

A process for preparing an improved wax-coated cellulosic product which comprises the steps of: (1) providing a paper or paperboard substrate: (2) coating the substrate with a mixture consisting essentially of (A) a fluorinated organic phosphate having the formula (R.sub.f L).sub.3-y Z wherein R f is R 2 (CF 2 ) a where R 2 is F or H and a is an integer from 1 to 20, (CF 3 ) 2 CR 3 (CF 2 ) b where R 3 is F or H when b is O and R 3 is F when b is an integer from 1 to 18, or R 4 (c-C 6 F 10 ) where R 4 is F or C n F 2n+1 in which n is an integer from 1 to 4 and c-designates an alicyclic structure, L is ##STR6## where R 5 is an alkyl group having from 1 to 10 carbon atoms, or the group --(CH.sub.2).sub.n O-- where n is an integer 1 or 2, y is an integer 1 or 1, and Z is P(O)(OM) x where x is the integer 1 or 2, and M is a water-solubilizing cation selected from the group consisting of alkali metal, ammonium and substituted ammonium when x is 1, and each M is independently selected from the group consisting of hydrogen, alkali metal, ammonium and substituted ammonium when x is 2, in an amount of between about 0.01 and about 0.2 pounds, per thousand square feet, and (B) a poly(oxypropylene)poly(oxethylene)block copolymer surfactant in an amount of between about 0.015 and about 0.18 pounds per thousand square feet of said intermediate layer and drying the resulting coated substrate; and (3) coating said coated substrate with molten wax.

Claim 10

The process of claim 7, wherein said fluorinated organic phosphate has the formula ##STR7##

Claim 11

The process of claim 8, wherein the substrate consists essentially of paperboard.

Claim 12

The process of claim 9, wherein the nonionic surfactant is of the type prepared by the sequential addition of ethylene oxide followed by propylene oxide to an ethylene glycol base.

Claim 13

The process of claim 10, wherein the fluorinated organic phosphate is applied to the paperboard substrate in an amount of between about 0.025 and about 0.038 pounds per thousand square feet.

Claim 14

The process of claim 11, wherein the nonionic surfactant is applied to the paperboard substrate in an amount of between about 0.08 and about 0.12 pounds per thousand square feet.