Herbert B Scher

US Patent:

6337130, Jan 8, 2002

Filed:

Jul 29, 1999

Appl. No.:

09/363571

Inventors:

Juanita Elena Van Koppenhagen - Vallejo CA
Herbert Benson Scher - Moraga CA
Ian Malcolm Shirley - Binfield, GB
Philip Wade - Runcorn, GB
Richard Follows - Astley, GB

Assignee:

Zeneca Limited - London

International Classification:

B32B 1502

US Classification:

42840221, 528230, 528245, 528259, 528 59, 528 61, 528 65, 42840224, 424 7808, 424 7836, 424 7837, 424462, 424489, 424497, 424405, 504116, 504148, 504189

Abstract:

Microcapsules of a microcapsule formed of a polyurea shell wall and an encapsulated ingredient or ingredients enclosed within the wall, the wall comprising at least one oligomeric acetal having the moiety in which R is (a) a moiety containing a chain of from 5 to about 40 optionally substituted carbon atoms, (b) a moiety containing a chain of from 4 to about 40 carbon atoms and one or more internally linked oxygen or sulfur atoms or âNH-groups, or (c) an optionally substituted ethylene or propylene moiety Z is (a) an optionally substituted phenyl group, (b) an optionally substituted C -C alkyl, C -C alkenyl, C -C cycloalkyl or C -C cycloalkenyl group, or (c) benzoyl, and n is 1 if R is (a) or (b), or is 2-20 if R is (c). The microcapsules are acid-sensitive and the capsule walls are relatively readily degraded or disintegrated by contacting the microcapsules with an acidic substance, preferably an organic or inorganic acid whereby the encapsulated ingredient or ingredients are released into the surrounding environment. The invention is particularly suitable for encapsulation of biologically active substances and agrochemicals, and most preferably pesticides for foliar treatment.

US Patent:

6340653, Jan 22, 2002

Filed:

May 30, 1995

Appl. No.:

08/453611

Inventors:

Herbert B. Scher - Moraga CA
Marius Rodson - El Sobrante CA

Assignee:

Syngenta Limited - Surrey

International Classification:

A01N 2528

US Classification:

504112, 504342, 504359

Abstract:

Microencapsulated compositions containing haloacetanilide herbicides, i. e. , acetochlor, are produced by microencapsulation process. The microencapsulated composition performs comparably to nonencapsulated compositions of the same herbicide applied at the same application rates.

US Patent:

6358520, Mar 19, 2002

Filed:

Jul 17, 1998

Appl. No.:

09/118513

Inventors:

Ray J. Lo - San Leandro CA
Jin L. Chen - El Cerrito CA
Herbert B. Scher - Moraga CA

Assignee:

Syngenta Limited - Surrey

International Classification:

A01N 2528

US Classification:

424408, 424406, 424417, 424418, 424419, 424420, 424421, 424497, 424501, 514531, 42721331, 42721334, 264 41, 264 43, 264 433, 264 47

Abstract:

Solid water-dispersible compositions containing microencapsulated pesticides are produced by spray-drying an aqueous suspension of said pesticides in the presence of a water-soluble polymer, preferably polyvinyl alcohol.

US Patent:

6419942, Jul 16, 2002

Filed:

May 17, 2000

Appl. No.:

09/572515

Inventors:

Ray Jia Ruey Lo - Alameda CA
Jin Ling Chen - Randolph NJ
Herbert Benson Scher - Moraga CA
Juanita Elena Van Koppenhagen - Vallejo CA
Ian Malcolm Shirley - Binfield, GB

Assignee:

Syngenta Limited

International Classification:

A01N 2528

US Classification:

424408, 424406, 424419, 424421, 514521, 514531

Abstract:

Solid water-dispersible compositions containing microencapsulated pesticides are produced by spray-drying an aqueous suspension of said pesticides in the presence of a water-soluble polymer, preferably polyvinyl alcohol.

US Patent:

6485736, Nov 26, 2002

Filed:

Sep 7, 2000

Appl. No.:

09/656718

Inventors:

Ian Malcolm Shirley - Binfield, GB
Juanita Elena Van Koppenhagen - Vallejo CA
Herbert Benson Scher - Moraga CA
Richard Follows - Greater Manchester, GB
Philip Wade - Cheshire, GB
Fergus Gerard Paul Earley - Highfield, GB
Dianne Beth Shirley - Binfield, GB

Assignee:

Syngenta Ltd. - Surrey

International Classification:

A61F 1300

US Classification:

424424, 504359, 504108, 4272133

Abstract:

A novel microcapsule comprising a liquid core material which is substantially insoluble in water and enclosed within a solid permeable shell of a polymer resin containing disulfide linkages is disclosed. The process for producing such microcapsules is likewise disclosed.

US Patent:

6514439, Feb 4, 2003

Filed:

Dec 11, 2001

Appl. No.:

10/013433

Inventors:

Juanita E. Van Koppenhagen - Vallejo CA
Herbert B. Scher - Richmond CA
Ian M. Shirley - Berkshire, GB
Philip Wade - Runcorn, GB
Richard Follows - Blackley, GB

Assignee:

Syngenta Ltd.

International Classification:

B01J 1302

US Classification:

264 41, 528 59, 528 61, 528 65, 528230, 528245, 528259, 264 43, 264 432, 264 433, 264 44

Abstract:

Microcapsules of a microcapsule formed of a polyurea shell wall and an encapsulated ingredient or ingredients enclosed within the wall, the wall comprising at least one oligomeric acetal having the moiety in which R is (a) a moiety containing a chain of from 5 to about 40 optionally substituted carbon atoms, (b) a moiety containing a chain of from 4 to about 40 carbon atoms and one or more internally linked oxygen or sulfur atoms or âNH-groups, or (c) an optionally substituted ethylene or propylene moiety Z is (a) an optionally substituted phenyl group, (b) an optionally substituted C -C alkyl, C -C alkenyl, C -C cycloalkyl or C -C cycloalkenyl group, or (c) benzoyl, and n is 1 if R is (a) or (b), or is 2-20 if R is (c). The microcapsules are acid-sensitive and the capsule walls are relatively readily degraded or disintegrated by contacting the microcapsules with an acidic substance, preferably an organic or inorganic acid whereby the encapsulated ingredient or ingredients are released into the surrounding environment. The invention is particularly suitable for encapsulation of biologically active substances and agrochemicals, and most preferably pesticides for foliar treatment.

US Patent:

6541422, Apr 1, 2003

Filed:

May 28, 1999

Appl. No.:

09/321639

Inventors:

Herbert B. Scher - Moraga CA
Jinling Chen - Randolph NJ

Assignee:

Syngenta Limited

International Classification:

A01N 5502

US Classification:

504116, 504191, 504190, 504348, 504349, 504350, 544 64, 544225, 562430, 564 85, 564 86, 564 92, 564 97, 568329, 558412, 558396, 558397, 560 12, 560 21

Abstract:

A method of selectively controlling undesirable vegetation in crops by using a postemergent application of an herbicidally effective amount of a metal chelate of a 2-(substituted benzoyl)-1,3-cyclohexanedione compound to the locus of such undesirable vegetation.

US Patent:

6544540, Apr 8, 2003

Filed:

Jul 28, 1999

Appl. No.:

09/363324

Inventors:

Juanita Elena Van Koppenhagen - Vallejo CA
Herbert Benson Scher - Moraga CA
Ian Malcolm Shirley - Binfield, GB
Philip Wade - Runcorn, GB
Richard Follows - Astley, GB

Assignee:

Syngenta Limited

International Classification:

A01N 2528

US Classification:

424408, 424406, 424417, 424418, 424419, 424497, 424DIG 8, 514521, 514531, 264 43, 264 47, 42721333, 42840221

Abstract:

Microcapsules formed from an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall in which the wall contains a base-cleavable ester moiety. These capsules have been found to be sensitive to the presence of base such that in the presence of base, the capsule walls are relatively quickly disintegrated or degraded so as to produce a relatively quick release of the encapsulated materials. Microcapsules of this invention are particularly suitable for use in controlling insects having an alkaline gut such as certain lepidoptera in that the capsule shell wall may be designed so as to quickly disintegrate under the alkaline conditions present in the gut of the insect thus providing a microcapsule which is safe to handle but which is selectively effective against certain undesirable insects while not harmful to beneficial insects or insects which do not feed on the capsule materials.