Stable, liquid starch graft copolymer composition
AssigneeStandard Brands Incorporated
InventorsAdrian P. Kightlinger, Edwin L. Speakman, Grant T. Van Duzee
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Abstract
This invention discloses stable, aqueous polymeric dispersions comprised of at least 25% solids, dry basis, of a starch graft copolymer of a thinned and derivatized starch and at least one vinyl monomer. The starch has a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than about 0.12 deciliters per gram. The starch graft copolymers have a starch/monomer ratio of less than about 100/25. The dispersions are stable over extended periods of time at normal storage temperatures. Processes for the production of the dispersions are also disclosed.
Claims30
A stable aqueous polymeric dispersion comprised of at least 25% solids by weight of a graft copolymer of at least one vinyl monomer and a derivatized and thinned starch with a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than 0.12 dl/g wherein the starch/monomer ratio of the graft copolymer is less than 100/25 by weight.
A stable aqueous polymeric dispersion comprised of at least 40% solids by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch with a degree of substitution in the range from about 0.06 to about 0.2 and an intrinsic viscosity in the range from about 0.13 dl/g to about 0.21 dl/g wherein the starch/monomer ratio is from about 100/40 to about 100/100 by weight.
The process of producing a stable aqueous polymeric dispersion comprised of at least 25% solids by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch which comprises forming a derivatized and thinned starch with a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than about 0.12 dl/g and forming a graft copolymer of said derivatized and thinned starch and at least one vinyl monomer by means of an initiator which acts to initiate graft copolymerization onto the starch to the substantial exclusion of the initiation of homopolymerization or copolymerization of said vinyl monomer(s) and wherein the starch/monomer ratio of the thinned and derivatized starch to the vinyl monomer(s) is less than about 100/25 by weight.
The process for producing a stable aqueous polymeric dispersion comprised of at least 40% solids by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch which comprises polymerizing at least one vinyl monomer with a derivatized and thinned starch having a degree of substitution in the range from about 0.06 to about 0.2 and an intrinsic viscosity in the range from about 0.13 to about 0.21 by means of a ceric ammonium nitrate initiator and wherein the starch/monomer ratio of the thinned and derivatized starch is in the range from about 100/40 to about 100/100.
A coating composition in which the adhesive binder is comprised of a stable, aqueous polymeric dispersion comprised of at least 25% solids by weight of a starch graft copolymer of at least vinyl monomer and a derivatized and thinned starch with a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than 0.12 dl/g wherein the starch/monomer ratio of said starch graft copolymer is less than about 100/25.
The method for the preparation of a coating composition in which a stable aqueous polymeric dispersion comprised of at least 25% solids by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch with a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than 0.12 dl/g wherein the starch/monomer ratio of said graft copolymer is less than about 100/25 comprises the adhesive element in said composition.
The method of reducing breakage in a textile yarn which comprises applying starch graft copolymer solids derived from a stable, aqueous polymeric dispersion comprised of at least 25% by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch with a degree of substitution of at least about 0.05 and an intrinsic viscosity of not less than about 0.12 dl/g wherein the starch/monomer ratio of said starch graft copolymer is less than about 100/25 to said textile yarn.
A sizing composition comprised of a stable, aqueous polymeric dispersion comprised of at least 25% by weight of a starch graft copolymer of at least one vinyl monomer and a derivatized and thinned starch with a degree of substitution of at last about 0.05 and an intrinsic viscosity of not less than about 0.12 dl/g wherein the starch/monomer ratio of said starch graft copolymer is less than about 100/25.
Dependencies are inferred from the claim text.