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US 5,589,256 AGranted
Particle binders that enhance fiber densification
AssigneeWeyerhaeuser Company
InventorsMichael R. Hansen, Richard H. Young, Sr.
Life of this patent
Estimating the term…
Abstract
A method of producing easily densified high bulk fibers that have adhered particulates. The high bulk fibers have hydrogen bonding or coordinate covalent bonding functionalities, and a binder is applied to the fibers to bind the particles to the fibers. The binder has a functional group that forms a hydrogen bond or a coordinate covalent bond with the particles, and a functional group that forms a hydrogen bond with the fibers. A substantial portion of the particles that are adhered to the fibers are adhered in particulate form by hydrogen bonds or coordinate covalent bonds to the binder, and the binder is in turn adhered to the fibers by hydrogen bonds. Fibers containing particles bound by this method are easily densified.
Claims56
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a binder having a functional group capable of forming a binder-fiber hydrogen bond as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond between fibers having hydrogen bonding functional sites and particles having a hydrogen bonding or coordinate covalent bonding functionality, the binder selected from the group consisting of (a) a polymeric binder with repeating units, wherein each repeating unit has a functional group capable of forming a hydrogen bond or a coordinate covalent bond with the particles, or a hydrogen bond with the fibers, and (b) a nonpolymeric organic binder, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
2 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a polymeric binder having repeating units between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the binder being selected from the group consisting of a polyamide, a polyamine, and copolymers thereof, wherein each repeating unit has a functional group capable of forming a binder-fiber hydrogen bond, or a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
2 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a nonpolymeric organic binder between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the nonpolymeric organic binder having a functional group selected from the group consisting of an amino acid, an amide, and an amine, and a functional group capable of forming a binder-fiber hydrogen bond, a binder-particle hydrogen bond, or a binder-particle coordinate covalent bond, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
2 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a nonpolymeric organic binder between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the nonpolymeric organic binder selected from the group consisting of glycerin, ascorbic acid, urea, glycine, pentaerythritol, a monosaccharide, a disaccharide, citric acid, tartaric acid, dipropylene glycol, and urea derivatives, having a functional group capable of forming a binder-fiber hydrogen bond, as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
2 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a binder between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the binder having a functional group capable of forming a binder-fiber hydrogen bond, as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- simultaneously with addition of the particles to the fibers, adding an activating fluid to the fibers and binder;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
3 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a binder between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the binder having a functional group capable of forming a binder-fiber hydrogen bond, as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- activating the binder by adding an activating liquid to the fibers, binder and particles, such that the binder then adheres a substantial portion of the particles to the fiber;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
3 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a liquid or moistened solid binder between the fibers having hydrogen bonding functional sites and the particles having a hydrogen bonding or coordinate covalent bonding functionality, the binder having a functional group capable of forming a binder-fiber hydrogen bond as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- activating the binder by mechanically agitating the fibers and particles in the presence of the binder, such that the binder then adheres a substantial portion of the particles to the fiber;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
3 more elements
A method of producing high bulk fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding particles having a hydrogen bonding or a coordinate covalent bonding functionality to the fibers;
- interposing a binder having a functional group capable of forming a binder-fiber hydrogen bond as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond between fibers having hydrogen bonding functional sites and particles having a hydrogen bonding or coordinate covalent bonding functionality, whereby a substantial portion of the particles with said functional groups are adhered in particulate form to the fibers with said functional sites;
- providing a crosslinking material on the fibers, the crosslinking material being curable to produce internally crosslinked high bulk fibers;
- curing the crosslinking material and fibers at an elevated temperature to produce cured high bulk fibers which are internally crosslinked while leaving hydrogen bonding functional sites available on the cured fibers for hydrogen bonding;
- and
- densifying the fibers with their bound particles by applying external pressure to the fibers after addition of the particles and binder,
- wherein the crosslinking material and binder may be the same or different, and if the crosslinking material and binder are selected from the group consisting of a polycarboxylic acid, a polyol, a polyaldehyde, and a polyamine, and curing occurs after particle addition, then at least 20% water by weight is present in the fibers during curing to inhibit covalent bond formation.
5 more elements
A method of producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- providing a crosslinking material on the fibers, the crosslinking material being curable to produce internally crosslinked high bulk fibers;
- curing the crosslinking material and fibers at an elevated temperature to produce cured high bulk fibers that are internally crosslinked while leaving hydrogen bonding functional sites available on the cured fibers for hydrogen bonding;
- adding particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing a binder having a functional group capable of forming a binder-fiber hydrogen bond as well as a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond between fibers having hydrogen bonding functional sites and particles having a hydrogen bonding for coordinate covalent bonding functionality, whereby a substantial portion of the particles with said functional groups are bound in particulate form to the fibers;
- and
- thereafter densifying the fibers with their bound particles by applying external pressure to the fibers.
4 more elements
A method for producing fibers with adhered particles comprising:
- providing fibers that have hydrogen bonding functional sites;
- adding superabsorbent particles to the fibers, wherein the particles have a hydrogen bonding or coordinate covalent bonding functionality;
- interposing glycerin between the fibers having hydrogen bonding functional sites and the superabsorbent particles having a hydrogen bonding or coordinate covalent bonding functionality, the glycerin having a functional group capable of forming a glycerin-fiber hydrogen bond, as well as a functional group capable of forming a glycerin-superabsorbent particle hydrogen bond or a glycerin-superabsorbent particle coordinate covalent bond, whereby a substantial portion of the superabsorbent particles with said functional groups are bound in particulate form to the fibers primarily by a hydrogen bond or coordinate covalent bond;
- and
- thereafter densifying the fibers with their bound superabsorbent particles by applying external pressure to the fibers.
2 more elements
A fiber product comprising:
- individualized fibers densified by applying pressure, having a density of 0.1 to 0.7 g/cc, and hydrogen bonding functionalities;
- and
- particles that are bound to the fibers by a binder interposed between the particles and the fibers, the particles having a hydrogen bonding or coordinate covalent bonding functionality, and the binder having a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bone and a functional group capable of forming a binder-fiber hydrogen bond, the binder selected from the group consisting of (a) a polymeric binder with repeating units, wherein each repeating unit has a functional group capable of forming a hydrogen bond or a coordinate covalent bond with the particles, or a hydrogen bond with the fibers;
- and (b) a nonpolymeric organic binder, wherein the product comprises 0.05-80% of said bound particles, said bound particles bound to the fibers primarily by a hydrogen bond or coordinate covalent bond.
1 more element
A fiber product comprising:
- individualized fibers densified by applying pressure, having a density of 0.1 to 0.7 g/cc, and hydrogen bonding functionality;
- and
- superabsorbent particles that are bound to the fibers by glycerin interposed between the particles and the fibers, the particles having a hydrogen bonding or coordinate covalent bonding functionality;
- and the glycerin having a functional group capable of forming a glycerin-superabsorbent particle hydrogen bond or a glycerin-superabsorbent particle coordinate covalent bond and a functional group capable of forming a glycerin-fiber hydrogen bond, wherein the product comprises 0.05-80% of said bound superabsorbent particles, said bound superabsorbent particles bound to the fibers primarily by a hydrogen bond or a coordinate covalent bond.
1 more element
A fiber product comprising:
- individualized high bulk fibers densified by applying pressure, having a density of 0.1 to 0.7 g/cc, hydrogen bonding functionality, and intrafiber covalent bonds;
- and
- particles that are bound to the fibers by a binder interposed between the particles and the fibers, the particles having a hydrogen bonding or coordinate covalent bonding functionality, and the binder having a functional group capable of forming a binder-particle hydrogen bond or a binder-particle coordinate covalent bond and a functional group capable of forming a binder-fiber hydrogen bond, wherein the product comprises 0.05-80% of said bound particles, said bound particles bound to the fibers primarily by a hydrogen bond or coordinate covalent bond.
Dependencies are inferred from the claim text.