Starch blend, process of sizing paper therewith, and product thereof

Claim 2

A paper or paperboard product having applied to the surface thereof a sizing amount of dispersion of a starch blend of 1-20 parts of a hydrophobic starch and 99-80 parts of a non-hydrophobic starch, said hydrophobic starch being a starch monoester of a dicarboxylic acid in which the two carboxylic acid groups are positioned on adjacent carbons, said dicarboxylic acids being selected from the group consisting of aliphatic, aromatic, cycloaliphatic, bicycloaliphatic dicarboxylic acids and alkyl and fluorine, chlorine, and bromine substituted derivatives thereof; and said dicarboxylic acids or substituted dicarboxylic acids have a total of 8-22 carbon atoms.

Claim 3

The paper or paperboard product of claim 1 wherein the hydrophobic starch is the monoester of dicarboxylic acids selected from the group consisting of n-octylsuccinic acid, 1-octenylsuccinic acid, phthalic acid, 1,4,5,6,7,7-hexachloro-5-norbornene-2,3-dicarboxylic acid, tetrachlorophthalic acid, endo-cis-5-norbornene-2, 3-dicarboxylic acid, hexahydro-4-methyl-phthalic acid, 1,2-cyclohexane-dicarboxylic acid, and cis-4-cyclohexene-1,2-dicarboxylic acid.

Claim 4

The paper or paperboard product of claim 1 wherein said starch blend is applied in an amount to provide a size concentration ranging from 0.25 to 15.0% of the weight of the finished dry paper or paperboard.

Claim 5

The paper or paperboard of claim 1 wherein the hydrophobic starch has a degree of substitution of from about 0.002 to 0.050.

Claim 6

The paper or paperboard product of claim 1 wherein the non-hydrophobic starch is corn starch or waxy maize.

Claim 7

The paper or paperboard product of claim 1 wherein the non-hydrophobic starch is a cationically substituted corn starch.

Claim 8

The paper or paperboard product of claim 1 wherein the starch blend is comprised of 4-14 parts by weight of hydrophobic starch and 96-86 parts by weight of non-hydrophobic starch.

Claim 9

The paper or paperboard product of claim 3 wherein the hydrophobic starch is the monoester of n-octenylsuccinic acid.

Claim 10

The paper or paperboard product of claim 4 wherein the hydrophobic starch is also cationically substituted.

Claim 11

The paper of paperboard product of claim 1 wherein the starch blend is applied in the presence of alum or other cationic donor.

Claim 12

A process of surface sizing paper or paperboard which comprises the step of applying to the surface thereof a sizing amount of a dispersion of a starch blend of 1-20 parts of a hydrophobic starch and 99-80 parts of a non-hydrophobic starch, said hydrophobic starch being a starch monoester of a dicarboxylic acid in which the two carboxylic acid groups are positioned on adjacent carbon atoms, said dicarboxylic acids being selected from the group consisting of aliphatic, aromatic, cycloaliphatic, bicycloaliphatic dicarboxylic acids and alkyl and fluorine, bromine and chlorine substituted derivatives thereof; and said dicarboxylic acids or substituted dicarboxylic acids having a total of 8-22 carbon atoms.

Claim 13

A process of surface sizing paper or paperboard which comprises the step of applying to the surface thereof a sizing amount of a dispersion of a starch blend of 1-20 parts of a hydrophobic starch and 99-80 parts of a non-hydrophobic starch, said hydrophobic starch being a starch monoester of a dicarboxylic acid in which the two carboxylic acid groups are positioned on adjacent carbon atoms, said dicarboxylic acids being selected from the group consisting of aliphatic, aromatic, cycloaliphatic, bicycloaliphatic dicarboxylic acids and alkyl and fluorine, bromine and chlorine substituted derivatives thereof; and said dicarboxylic acids or substituted dicarboxylic acids having a total of 8-22 carbon atoms.

Claim 14

The process of claim 11 wherein the hydrophobic starch is the monoester of dicarboxylic acids selected from the group consisting of n-octylsuccinic acid, 1-octenylsuccinic acid, phthalic acid, 1,4,5,6,7,7-hexachloro-5-norbornene-2,3-dicarboxylic acid, tetrachlorophthalic acid, endo-cis-5-norbornene-2,3-dicarboxylic acid, hexahydro-4-methylphthalic acid, 1,2-cyclohexane-dicarboxylic acid, and cis-4-cyclohexane-1,2-dicarboxylic acid.

Claim 15

The process of claim 11 wherein the hydrophobic starch has a degree of substitution of from about 0.002 to 0.050, and said starch blend is applied in an amount to provide a size concentration ranging from 0.25 to 15% of the weight of the finished dry paper or paperboard.

Claim 16

The process of claim 11 wherein the non-hydrophobic starch is corn starch or waxy maize.

Claim 17

The process of claim 11 wherein the non-hydrophobic starch is cationically substituted corn starch.

Claim 18

The process of claim 14 wherein the hydrophobic starch is also cationically substituted.

Claim 19

The process of claim 11 wherein the starch blend is applied in the presence of alum or other cationic donor.

Claim 20

A starch blend comprising 1-20 parts of a hydrophobic starch and 99-80 parts of a non-hydrophobic starch, said hydrophobic starch being a starch monoester of a dicarboxylic acid in which the two carboxylic acid groups are positioned on adjacent carbons, said dicarboxylic acids selected from the group consisting of aliphatic, aromatic, cycloaliphatic, bicycloaliphatic dicarboxylic acids and alkyl and fluorine, chlorine and bromine substituted derivatives thereof; and said dicarboxylic acids or substituted dicarboxylic acids have a total of 8-22 carbon atoms.

Claim 21

A starch blend comprising 1-20 parts of a hydrophobic starch and 99-80 parts of a non-hydrophobic starch, said hydrophobic starch being a starch monoester of a dicarboxylic acid in which the two carboxylic acid groups are positioned on adjacent carbons, said dicarboxylic acids selected from the group consisting of aliphatic, aromatic, cycloaliphatic, bicycloaliphatic dicarboxylic acids and alkyl and fluorine, chlorine and bromine substituted derivatives thereof; and said dicarboxylic acids or substituted dicarboxylic acids have a total of 8-22 carbon atoms.

Claim 22

The starch blend of claim 18 wherein the hydrophobic starch is the monoester of dicarboxylic acids selected from the group consisting of n-octylsuccinic acid, 1-octenyl-succinic acid, phthalic acid, 1,4,5,6,7,7-hexachloro-5-norbornene-2,3-dicarboxylic acid, tetrachlorophthalic acid, endo-cis-5-norbornene-2,3-dicarboxylic acid, hexahydro-4-methylphthalic acid, 1,2-cyclohexane-dicarboxylic acid, and cis-4-cyclohexene-1,2-dicarboxylic acid.

Claim 23

The starch blend of claim 18 wherein the hydrophobic starch has a degree of substitution of from about 0.002 to 0.050.

Claim 24

The starch blend of claim 18 wherein the non-hydrophobic starch is selected from the group consisting of corn starch, waxy maize and cationically substituted corn starch.

Claim 25

The starch blend of claim 18 wherein the starch blend is comprised of 4-14 parts by weight of hydrophobic starch and 96-86 parts by weight of non-hydrophobic starch.

Claim 26

The process of claim 11 wherein the starch blend is comprised of 4-14 parts by weight of hydrophobic starch and 96-86 parts by weight of non-hydrophobic starch.