Alkenylsuccinic anhydride composition and method of using the same

A process for making a sizing composition comprising the sequential steps of:

• (a) emulsifying alkenylsuccinic anhydride with a first starch component containing starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming an emulsion, and
• (b) combining the emulsion with a second starch component selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming a sizing composition comprising
• (1) an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and
• (2) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures thereof, such that the alkenylsuccinic anhydride and the starch in the emulsion and the second starch component are present at a starch:alkenylsuccinic anhydride weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the-fibrous substrate.

A process for sizing a paper product comprising:

• (a) adding, to a pulp slurry, a wet end sizing agent component;
• (b) forming a fibrous sheet from the slurry, and
• (c) treating the fibrous sheet with a sizing composition comprising:
• (1) an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and
• (2) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures thereof, and thereby imparting useful sizing properties to the fibrous substrate.

A process for sizing a fibrous substrate comprising:

• (a) emulsifying alkenylsuccinic anhydride with a first starch component containing starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming an emulsion,
• (b) combining the emulsion with a second starch component selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming a sizing composition comprising:
• (1) an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof,
• (2) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures thereof,
• wherein the alkenylsuccinic anhydride and the starch in the emulsion and the second starch component are present at a starch:alkenylsuccinic anhydride weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the fibrous substrate, and
• (c) treating a fibrous sheet with the sizing composition, and thereby imparting useful sizing properties to the fibrous substrate.

An aqueous sizing composition made by a process comprising:

• (a) emulsifying alkenylsuccinic anhydride with a first starch component containing starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming an emulsion, and
• (b) combining the emulsion with a second starch component selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and
• thereby forming the sizing composition,
• wherein the composition comprises:
• (1) first component including an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and
• (2) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures wherein the alkenylsuccinic anhydride and the starch in the emulsion and the second starch component are present at a starch:alkenylsuccinic anhydride weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the fibrous substrate.

A sized fibrous substrate made by a process comprising:

• (a) emulsifying alkenylsuccinic anhydride with a first starch component containing starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and thereby forming an emulsion, and
• (b) combining the emulsion with a second starch component selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and forming an aqueous sizing composition comprising:
• (1) an emulsion comprising an alkenylsuccinic anhydride component containing alkenylsuccinic anhydride particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, ionic starches, and mixtures thereof, and
• (2) a second starch component selected from the group consisting of non-ionic starches, ionic starches and mixtures thereof;
• wherein the alkenylsuccinic anhydride and the starch in the emulsion and the second starch component are present at a starch:alkenylsuccinic anhydride weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the fibrous substrate, and
• (c) treating a fibrous substrate with the aqueous sizing composition, and thereby forming a sized fibrous substrate.

An aqueous sizing composition comprising:

• (a) an emulsion comprising an alkyl ketene dimer component containing alkyl ketene dimer particles suspended in a first starch component containing emulsifying starch selected from the group consisting of non-ionic starches, anionic starches, and mixtures thereof, and
• (b) a second starch component selected from the group consisting of non-ionic starches, cationic starches, anionic starches and mixtures thereof,
• wherein the alkyl ketene dimer component and the starch in the emulsion and the second starch component are present at a starch:
• alkyl ketene dimer weight ratio that is sufficiently high to enable the sizing composition to impart useful sizing properties to a fibrous substrate when the sizing composition contacts the fibrous substrate.