Process for making silver nanostructures and copolymer useful in such process

Patent metadata

Field	Value
Publication number	US-2016303658-A1
Application number	US-201615194796-A
Country	US
Kind code	A1
Filing date	Jun 28, 2016
Priority date	Sep 27, 2012
Publication date	Oct 20, 2016
Grant date	—

Abstract

A process for making silver nanostructures, which includes the step of reacting at least one polyol and at least one silver compound that is capable of producing silver metal when reduced, in the presence of: (a) a source of chloride or bromide ions, and (b) at least one copolymer that comprises: (i) one or more first constitutional repeating units that each independently comprise at least one pendant saturated or unsaturated, five-, six-, or seven-membered, acylamino- or diacylamino-containing heterocylic ring moiety per constitutional repeating unit, and (ii) one or more second constitutional repeating units, each of which independently differs from the one or more first nonionic constitutional repeating units, and has a molecular weight of greater than or equal to about 500 grams per mole, is described herein.

First claim

What is claimed is:

1 . Silver nanostructures made by the process comprising: reacting at least one polyol and at least one silver compound that is capable of producing silver metal when reduced, in the presence of:
(a) a source of chloride or bromide ions, and (b) at least one copolymer that comprises:
(i) one or more first constitutional repeating units that each independently comprise at least one pendant saturated or unsaturated, five-, six-, or seven-membered, acylamino- or diacylamino-containing heterocylic ring moiety per first constitutional repeating unit, and
(ii) one or more second constitutional repeating units, each of which independently differs from the one or more first constitutional repeating units, the second constitutional repeating unit comprising at least one pendant cationic moiety that comprises a quaternary ammonium nitrogen atom and a nitrate counter anion,
and has a molecular weight of greater than or equal to about 500 grams per mole.

2 . A copolymer, comprising, based on 1000 constitutional repeating units of the copolymer:
from 800 to 999 first constitutional repeating units, each independently comprising at least one pendant saturated or unsaturated, five-, six-, or seven-membered, acylamino- or diacylamino-containing heterocylic ring moiety per constitutional repeating unit, and from 1 to 200 second constitutional repeating units, each independently comprising at least one pendant organic moiety per unit that: (i) is selected from ionic organic moieties and nonionic organic moieties, and (ii) is not a saturated or unsaturated, five-, six-, or seven-membered, acylamino- or diacylamino-containing heterocylic ring moiety,
and having a molecular weight of greater than or equal to about 500 grams per mole.

3 . The copolymer of claim 2 , wherein the second repeating units each independently comprise at least one pendant organic moiety per unit that is selected from cationic organic moieties.

4 . The copolymer of claim 3 , wherein, the copolymer is a random copolymer made by free radical polymerization of vinyl pyrrolidone, vinyl caprolactam, or vinyl pyrrolidone and vinyl caprolactam with one or more ethylenically unsaturated cationic monomers.

5 . The copolymer of claim 4 , wherein the one or more ethylenically unsaturated cationic monomers are selected from dimethylaminomethyl (meth)acrylate, dimethylaminopropyl (meth)acrylate, di(t-butyl)aminoethyl (meth)acrylate, dimethylaminomethyl (meth)acrylamide, dimethylaminoethyl (meth)acrylamide, dimethylaminopropyl (meth)acrylamide, vinylamine, vinyl imidazole, vinylpyridine, vinylpyrrolidine, vinylpyrroline, vinylpyrazolidine, vinylpyrazoline, vinylpiperidine, vinylpiperazine, vinylpyridine, vinylpyrazine, vinylpyrimadine, vinylpyridazine, trimethylammonium ethyl (meth)acrylate salts, dimethylammonium ethyl (meth)acrylate salts, dimethylbenzylammonium (meth)acrylate salts, benzoylbenzyl dimethylammonium ethyl(meth) acrylate salts, trimethyl ammonium ethyl (meth)acrylamido salts, trimethyl ammonium propyl (meth)acrylamido salts, vinylbenzyl trimethyl ammonium salts, and diallyldimethyl ammonium salts.

6 . The copolymer of claim 4 , wherein the copolymer is a random copolymer made by free radical polymerization of a monomer mixture comprising from about 800 to less than 1000 parts by weight of vinyl pyrrolidone and from greater than 0 to about 200 parts by weigh of a diallyldimethylammonium salt.

Assignees

• Rhodia Operations

Inventors

• Alsayed Ahmed
• Hough Lawrence
• Badre Chantal

Classifications

• B22F1/00

  Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties · CPC title

• H01B1/124

  Intrinsically conductive polymers · CPC title

• C08F226/10 Primary

  N-Vinyl-pyrrolidone · CPC title

• B22F9/18 Primary

  with reduction of metal compounds · CPC title

• H01B1/02

  mainly consisting of metals or alloys · CPC title