Paper coating or binding formulations and methods of making and using same
AssigneeBASF SE
InventorsPeter C. Hayes, Ralph Lewis De Jong
Life of this patent
Estimating the term…
Abstract
A paper coating or binding formulation comprises an aqueous polymer dispersion comprising a copolymer obtained by polymerization of an unsaturated monomer and a carbohydrate derived compound and a tetrasulfonate-based fluorescent whitening agent. The carbohydrate derived compound can be selected from the group consisting of dextrins, maltodextrins, and mixtures thereof. Methods of preparing a paper coating or binding formulation and improving the whitening properties of paper are also provided. Furthermore, paper including a copolymer obtained by polymerization of an unsaturated monomer and a carbohydrate derived compound and a tetrasulfonate-based fluorescent whitening agent is also disclosed.
Claims40
A paper coating or binding formulation, comprising:
- an aqueous polymer dispersion comprising a copolymer derived from 40% to 75% by weight of styrene, 25% to 60% by weight of butadiene, 1% to 10% by weight of itaconic and/or (meth)acrylic acid, 0% to 3% by weight of (meth)acrylamide, 0% to 20% by weight of (meth)acrylonitrile, and greater than 0% to less than 50% by weight of a carbohydrate-derived compound having a dextrose equivalent (DE) of about 10 to about 35, based on the total monomer weight;
- and
- a tetrasulfonate-based fluorescent whitening agent.
8-10. (canceled)
A method of preparing a paper coating or binding formulation, comprising:
- polymerizing a mixture of 40% to 75% by weight of styrene, 25% to 60% by weight of butadiene, 1% to 10% by weight of itaconic and/or (meth)acrylic acid, 0% to 3% by weight of (meth)acrylamide, 0% to 20% by weight (meth)acrylonitrile, and greater than 0% to less than 50% by weight of a carbohydrate-derived compound having a dextrose equivalent (DE) of about 10 to about 35, based on the total monomer weight, in an aqueous medium to produce a styrene-butadiene copolymer in an aqueous polymer dispersion, and
- mixing the aqueous polymer dispersion with a tetrasulfonate-based fluorescent whitening agent.
A method of improving the whitening properties of paper;
- comprising:
- providing an aqueous polymer dispersion comprising a copolymer derived from 40% to 75% by weight of styrene, 25% to 60% by weight of butadiene, 1% to 10% by weight of itaconic and/or (meth)acrylic acid, 0% to 3% by weight of (meth)acrylamide, 0% to 20% by weight of (meth)acrylonitrile, and greater than 0% to less than 50% by weight of a carbohydrate-derived compound having a dextrose equivalent (DE) of about 10 to about 35, based on the total monomer weight;
- mixing the aqueous polymer dispersion with a tetrasulfonate-based fluorescent whitening agent to produce a paper coating or binding formulation;
- and
- applying the formulation as a coating to paper.
Paper comprising a fiber matrix and a binder composition comprising a copolymer derived from 40% to 75% by weight of styrene, 25% to 60% by weight of butadiene, 1% to 10% by weight of itaconic and/or (meth)acrylic acid, 0% to 3% by weight of (meth)acrylamide, 0% to 20% by weight of (meth)acrylonitrile, and greater than 0% to less than 50% by weight of a carbohydrate-derived compound having a dextrose equivalent (DE) of about 10 to about 35, based on the total monomer weight, and a tetrasulfonate-based fluorescent whitening agent.
Dependencies are inferred from the claim text.