Coating compositions comprising alkyl ketene dimers and alkyl succinic anhydrides for use in paper making
AssigneeSpectra-Kote Corporation
InventorsCharles W. PROPST, JR., James C. Jones
Life of this patent
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Abstract
Additives for paper making are disclosed herein. Specifically, the additives are wax-free alternatives to conventional coatings, including ASA, AKD and optionally an acrylic containing composition. Other additives may be included in the coating, such as cationic particles or compositions. The coatings may be used at a variety of points during the paper making process, including on the calender stack and in the wet end.
Claims40
In a process for making paper wherein a furnish is deposited on a wire and dewatered, the improvement comprising:
- adding to the furnish a mixture comprising an effective amount of a composition comprising at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally an acrylic acid containing composition.
In a process for making paper, wherein a furnish is deposited on a wire and dewatered to form a paper, and the dewatered paper is subsequently pressed a number of times to further reduce the water content of the paper, the improvement comprising adding a mixture comprising an effective amount of a composition, the composition comprising at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally an acrylic acid containing composition, to at least one side of the dewatered paper subsequent to a first pressing step.
In a process for making paper wherein a furnish is deposited on a wire and dewatered to form a paper, the dewatered paper is subsequently pressed to further reduce the water content of the paper and is subsequently calendered, the improvement comprising introducing to at least one side of the paper a mixture, the mixture comprising an effective amount of a composition, said composition comprising at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally an acrylic acid containing composition, between the pressing and calendering steps.
A process for making paper comprising the following steps:
- (A) applying a furnish to a wire;
- (B) dewatering the furnish and obtaining a water containing paper;
- (C) pressing the water containing paper to reduce the water content;
- (D) calendering the pressed paper;
- (E) recovering a finished paper;
- and
- (F) adding a coating, comprising an effective amount of at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally an acrylic acid containing composition.
A composition comprising:
- at least one member selected from the group consisting of alkyl ketene dimer and alkylene succinic anhydride;
- an acrylic acid containing composition;
- and
- optionally wood fibers.
A process of making a coated paper or kraft stock comprising the steps of:
- providing a paper or kraft stock;
- applying an aqueous resin coating composition as a coating to said paper or stock in an amount in excess of the desired amount of coating;
- said aqueous coating composition comprising at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally an acrylic acid containing composition;
- metering and removing unwanted coating material from said paper or stock coated with said excess amount of coating material by directing a flow of fluid against said coating;
- solidfying the coating on Said paper or stock;
- and
- obtaining a coated paper or kraft stock.
In a process for making paper wherein a furnish is deposited on a wire and dewatered, the improvement comprising:
- adding to the furnish a mixture comprising an effective amount of a composition comprising at least one member selected from the group consisting of alkyl ketene dimer (AKD) and alkyl succinic anhydride (ASA) and optionally a polymerizable cationic composition.
Dependencies are inferred from the claim text.