Dense star polymer
First Claim
1. A star polymer having at least one core branch emanating from a core, each core branch having at least one terminal group provided that (1) the ratio of terminal groups to the branches emanating from the core is two or greater, (2) the density of terminal groups in the polymer is at least 1.5 times that of a conventional star polymer having similar core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the conventional star polymer bears only one terminal group, and (3) a molecular volume that is equal to or less than 60 percent of the molecular volume of said conventional star polymer.
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Accused Products
Abstract
Dense star polymers having terminal group densities greater than conventional star polymers exhibit greater and more uniform reactivity than their corresponding conventional star polymers. For example, a third generation, amine-terminated polyamidoamine dense star polymer prepared from ammonia, methyl acrylate and ethylenediamine has 1.24×10-4 amine moieties per unit volume (cubic Angstrom units) in contrast to the 1.58×10-6 amine moieties per unit volume contained by a conventional star polymer. Such dense star polymers are useful as demulsifiers for oil/water emulsions, wet strength agents in the manufacture of paper, and agents for modifying viscosity in aqueous formulations such as paints.
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Citations
19 Claims
- 1. A star polymer having at least one core branch emanating from a core, each core branch having at least one terminal group provided that (1) the ratio of terminal groups to the branches emanating from the core is two or greater, (2) the density of terminal groups in the polymer is at least 1.5 times that of a conventional star polymer having similar core and monomeric moieties and a comparable molecular weight and number of core branches wherein each of such branches of the conventional star polymer bears only one terminal group, and (3) a molecular volume that is equal to or less than 60 percent of the molecular volume of said conventional star polymer.
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7. An amidoamine dendrimer which is represented by the formula:
- ##STR31## wherein A is a n-valent core derived from a nucleophilic compound, R is hydrogen or lower alkyl, B is a divalent moiety capable of linking amine groups, n is an integer of 3 or more corresponding to the number of the core branches and Z is hydrogen or ##STR32## wherein R1 is hydrogen or ##STR33## provided that the dendrimer has no more than 20 generations wherein each generation is represented by ##STR34##
- View Dependent Claims (8)
- 14. A dendrimer having (1) a polyvalent core derived from a primary amine or a heterocyclic amine and (2) at least two ordered dendritic core branches which (a) are covalently bonded to the polyvalent core, (b) extend through at least two generations, and (c) have at least 3 terminal groups per core branch.
Specification